Digital rights management
Digital Rights Management (DRM) is a class of technologies that are used by hardware manufacturers, publishers, copyright holders, and individuals with the intent to control the use of digital content and devices after sale; there are, however, many competing definitions. With first-generation DRM software, the intent is to control copying; with second-generation DRM, the intent is to control executing, viewing, copying, printing, and altering of works or devices. The term is also sometimes referred to as copy protection, copy prevention, and copy control, although the correctness of apply DRM is in dispute. DRM is a set of access control technologies. In 1998, the Digital Millennium Copyright Act (DMCA) was passed in the United States to impose criminal penalties on those who make available technologies whose primary purpose and function are to circumvent content protection technologies.
The use of digital rights management is not universally accepted. Some content providers claim that DRM is necessary to fight copyright infringement and that it can help the copyright holder maintain artistic control or ensure continued revenue streams. Proponents argue that digital locks should be considered necessary to prevent "intellectual property" from being copied freely, just as physical locks are needed to prevent personal property from being stolen. Those opposed to DRM contend there is no evidence that DRM helps prevent copyright infringement, arguing instead that it serves only to inconvenience legitimate customers, and that DRM helps big business stifle innovation and competition. Furthermore, works can become permanently inaccessible if the DRM scheme changes or if the service is discontinued.
Digital locks placed in accordance with DRM policies can also restrict users from exercising their legal rights under copyright law, such as backing up copies of CDs or DVDs, lending materials out through a library, accessing works in the public domain, or using copyrighted materials for research and education under the US fair use laws, and under French law. The Electronic Frontier Foundation (EFF) and the Free Software Foundation (FSF) consider the use of DRM systems to be anti-competitive practice.
- Common DRM techniques 1.1
DRM and computer games 2.1
- Limited install activations 2.1.1
- Persistent online authentication 2.1.2
- Software tampering 2.1.3
- CD Keys 2.1.4
- DRM and documents 2.2
- DRM and e-books 2.3
- DRM and film 2.4
DRM and music 2.5
- Audio CDs 2.5.1
Internet music 2.5.2
- Mobile Ring Tones 184.108.40.206
- DRM and television 2.6
- Metadata 2.7
- Watermarks 2.8
- DRM and computer games 2.1
Laws regarding DRM 3
- Digital Millennium Copyright Act 3.1
- European Union 3.2
- International issues 3.3
- Israel 3.4
Opposition to DRM 4
- DRM-free works 4.1
Methods to bypass DRM 5.1
- DRM bypass methods for audio and video content 5.1.1
- Analog hole 5.2
- DRM on general computing platforms 5.3
- DRM on purpose-built hardware 5.4
- Watermarks 5.5
- Undecrypted copying failure 5.6
- Obsolescence 5.7
- Environmental issues 5.8
- Moral and legitimacy implications 5.9
- Relaxing some forms of DRM can be beneficial 5.10
- Can increase piracy 5.11
- Methods to bypass DRM 5.1
Alternatives to DRM 6
- "Easy and cheap" 6.1
- Crowdfunding/pre-order model 6.2
- Digital content as promotion for traditional products 6.3
- Artistic Freedom Voucher 6.4
- Historical note 7
See also 8
- Related concepts 8.1
- Lawsuits 8.2
- Organizations 8.3
- References 9
- Further reading 10
- External links 11
The advent of digital media and analog-to-digital conversion technologies (especially those that are usable on mass-market general-purpose personal computers) has vastly increased the concerns of copyright-dependent individuals and organizations. These concerns are particularly prevalent within the music and movie industries, because these sectors are partly or wholly dependent on the revenue generated from such works. While analog media inevitably loses quality with each copy generation, and in some cases even during normal use, digital media files may be duplicated an unlimited number of times with no degradation in the quality of subsequent copies.
The advent of personal computers as household appliances has made it convenient for consumers to convert media (which may or may not be copyrighted) originally in a physical, analog or broadcast form into a universal, digital form (this process is called ripping) for portability or viewing later. This, combined with the Internet and popular file-sharing tools, has made unauthorized distribution of copies of copyrighted digital media (also called digital piracy) much easier.
DRM technologies enable content publishers to enforce their own access policies on content, such as restrictions on copying or viewing. In cases where copying or some other use of the content is prohibited, regardless of whether or not such copying or other use is legally considered a "fair use", DRM technologies have come under fire. DRM is in common use by the entertainment industry (e.g., audio and video publishers). Many online music stores, such as Apple's iTunes Store, and e-book publishers also use DRM, as do cable and satellite service operators, to prevent unauthorized use of content or services. However, Apple quietly dropped DRM from all iTunes music files in about 2009.
Common DRM techniques
Digital Rights Management Techniques include:
- Restrictive Licensing Agreements: The access to digital materials, copyright and public domain is controlled. Some restrictive licenses are imposed on consumers as a condition of entering a website or when downloading software.
- Encryption, Scrambling of expressive material and embedding of a tag: This technology is designed to control access and reproduction of information. This includes backup copies for personal use.
DRM and computer games
Limited install activations
Computer games sometimes use DRM technologies to limit the number of systems the game can be installed on by requiring authentication with an online server. Most games with this restriction allow three or five installs, although some allow an installation to be 'recovered' when the game is uninstalled. This not only limits users who have more than three or five computers in their homes (seeing as the rights of the software developers allow them to limit the number of installations), but can also prove to be a problem if the user has to unexpectedly perform certain tasks like upgrading operating systems or reformatting the computer's hard drive, tasks which, depending on how the DRM is implemented, count a game's subsequent reinstall as a new installation, making the game potentially unusable after a certain period even if it is only used on a single computer.
In mid-2008, the publication of Mass Effect marked the start of a wave of titles primarily making use of SecuROM for DRM and requiring authentication with a server. The use of the DRM scheme in 2008's Spore backfired and there were protests, resulting in a considerable number of users seeking a pirated version instead. This backlash against 3 activation limit was a significant factor in Spore becoming the most pirated game in 2008, with TorrentFreak compiling a "top 10" list with Spore topping the list. However, Tweakguides concluded that the presence of intrusive DRM does not appear to increase piracy of a game, noting that other games on the list such as Call of Duty 4, Assassin's Creed and Crysis use SafeDisc DRM, which has no install limits and no online activation. Additionally, other video games that do use intrusive DRM such as BioShock, Crysis Warhead, and Mass Effect, do not appear on the list.
Persistent online authentication
Many mainstream publishers continued to rely on online DRM throughout the later half of 2008 and early 2009, including Electronic Arts, Ubisoft, Valve, and Atari, The Sims 3 being a notable exception in the case of Electronic Arts. Ubisoft broke with the tendency to use online DRM in late 2008 with the release of Prince of Persia as an experiment to "see how truthful people really are" regarding the claim that DRM was inciting people to use pirated copies. Although Ubisoft has not commented on the results of the "experiment", Tweakguides noted that two torrents on Mininova had over 23,000 people downloading the game within 24 hours of its release.
Ubisoft formally announced a return to online authentication on 9 February 2010 through its Uplay online gaming platform, starting with Silent Hunter 5, The Settlers 7, and Assassin's Creed II. Silent Hunter 5 was first reported to have been compromised within 24 hours of release, but users of the cracked version soon found out that only early parts of the game were playable. The Uplay system works by having the installed game on the local PCs incomplete and then continuously downloading parts of the game-code from Ubisoft's servers as the game progresses. It was only more than a month after the PC release in the first week of April that software was released that could bypass Ubisoft's DRM in Assassin's Creed II, demonstrating its strength. The software did this by emulating a Ubisoft server for the game. Later that month, a real crack was released that was able to remove the connection requirement altogether.
In early March 2010, Uplay servers suffered a period of inaccessibility due to a large-scale DDoS attack, causing around 5% of game owners to become locked out of playing their game. The company later credited owners of the affected games with a free download, and there has been no further downtime.
Other developers, such as Blizzard Entertainment are also shifting to a strategy where most of the game logic is on the "side" or taken care of by the servers of the game maker. Blizzard uses this strategy for its game Diablo III and Electronic Arts used this same strategy with their reboot of SimCity, the necessity of which has been questioned.
Bohemia Interactive have used a form of technology since Operation Flashpoint: Cold War Crisis, wherein if the game is suspected of being pirated, annoyances like guns losing their accuracy or the players being turned into a bird are introduced.
Croteam, the company that released Serious Sam 3: BFE in November 2011, implemented a different form of DRM wherein, instead of displaying error messages that stop the pirated version of the game from running, it causes a special invincible foe in the game to appear and constantly attack the player until they are killed.
One of the oldest and least complicated DRM protection method for the computer games is a CD Key. CD Keys are a series of numbers and letters included with copies of the game, usually printed somewhere on the CD or the software package. During installation the program will request that the user enter CD Key to authenticate the product. Without the CD Key, installation is impossible. There are sizable disadvantages to this protection method for both consumers and producers. For example, if a consumer loses his CD Key, he is unable to install and legitimize his purchased product without contacting customer service. For the producers and developers piracy is a significant issue. Many websites are offering “cd key cracks” and “cd key generators” for many different games and products. This will generate a series of characters that the software interprets as a valid CD Key and bypasses this form of DRM protection.
DRM and documents
Enterprise digital rights management (E-DRM or ERM) is the application of DRM technology to the control of access to corporate documents such as Microsoft Word, PDF, and AutoCAD files, emails, and intranet web pages rather than to the control of consumer media. E-DRM, now more commonly referenced as IRM (Information Rights Management), is generally intended to prevent the unauthorized use (such as industrial or corporate espionage or inadvertent release) of proprietary documents. IRM typically integrates with content management system software but corporations such as Samsung Electronics also develop their own custom DRM systems.
DRM has been used by organizations such as the British Library in its secure electronic delivery service to permit worldwide access to substantial numbers of rare (and in many cases unique) documents which, for legal reasons, were previously only available to authorized individuals actually visiting the Library's document centre at Boston Spa in England.
DRM and e-books
Electronic books read on a personal computer or an e-book reader typically use DRM technology to limit copying, printing, and sharing of e-books. E-books (alternatively “ebooks”) are usually limited to be used on a certain number of reading devices and some e-publishers prevent any copying or printing. Some commentators believe that DRM makes e-book publishing complex.
There are five main ebook formats at present. Mobipocket, KF8, Topaz, ePub and PDF. The Amazon Kindle uses Mobipocket, KF8 and Topaz; it also supports native PDF format ebooks and native PDF files. Other ebook readers mostly use ePub format ebooks, but with differing DRM schemes.
There are four main ebook DRM schemes in common use today, one each from Amazon, Adobe, Apple, and the Marlin Trust Management Organization (MTMO).
- Amazon's DRM is an adaption of the original Mobipocket encryption, and is applied to Amazon's Mobipocket, KF8 and .azw4 format ebooks. Topaz format ebooks have their own encryption system.
- Adobe's Adept DRM is applied to ePubs and PDFs, and can be read by several third-party ebook readers, as well as Adobe Digital Editions software. Barnes & Noble uses a DRM technology provided by Adobe, and is applied to ePubs and the older Palm format ebooks. In 2014, Adobe announced a new DRM scheme to replace the old one, to become available as soon as March 2014.
- Apple's Fairplay DRM is applied to ePubs, and can currently only be read by Apple's iBooks app on iOS devices.
- The Marlin DRM was developed and is maintained in an open industry group known as the Marlin Developer Community (MDC) and is licensed by MTMO. (Marlin was founded by five companies, Intertrust, Panasonic, Philips, Samsung and Sony.) The Kno online textbook publisher uses Marlin to protect ebooks it sells in the ePub format. These books can be read on the Kno App for iOS and Android tablets.
In one instance of DRM that caused a rift with consumers, Nineteen Eighty-Four and Animal Farm from customers' Amazon Kindles after providing them a refund for the purchased products. Commentators have widely described these actions as Orwellian, and have alluded to Big Brother from Orwell's Nineteen Eighty-Four. After Amazon CEO Jeff Bezos issued a public apology, the Free Software Foundation wrote that this was just one more example of the excessive power Amazon has to remotely censor what people read through its software, and called upon Amazon to free its e-book reader and drop DRM. Amazon then revealed that the reason behind its deletion was the ebooks in question were unauthorized reproductions of Orwell's works, which were not within the public domain and to which the company that published and sold them on Amazon's service had no rights.
DRM and film
An early example of a DRM system is the Content Scrambling System (CSS) employed by the DVD Forum on film DVDs c. 1996. CSS uses an encryption algorithm to encrypt content on the DVD disc. Manufacturers of DVD players must license this technology and implement it in their devices so that they can decrypt the encrypted content to play it. The CSS license agreement includes restrictions on how the DVD content is played, including what outputs are permitted and how such permitted outputs are made available. This keeps the encryption intact as the video material is played out to a TV. In 1999, Jon Lech Johansen released an application called DeCSS which allowed a CSS-encrypted DVD to play on a computer running the Linux operating system, at a time when no licensed DVD player application for Linux had yet been created. In the same year, Windows came out with Windows Media DRM, which read instructions from media files in a rights management language that stated what the user may do with the media. The language can define how many times the media file can be played, if it can be burned to a CD, if it can be printed, forwarded, or saved to the local disk. Later versions of Windows Media DRM also allow producers to declare whether or not the user may transfer the media file to other devices, to implement music subscription services that make downloaded files unplayable after canceled subscription, and implement regional lockout.
Microsoft's Windows Vista contains a DRM system called the Protected Media Path, which contains the Protected Video Path (PVP). PVP tries to stop DRM-restricted content from playing while unsigned software is running in order to prevent the unsigned software from accessing the content. Additionally, PVP can encrypt information during transmission to the monitor or the graphics card, which makes it more difficult to make unauthorized recordings.
Advanced Access Content System (AACS) is a DRM system for HD DVD and Blu-ray Discs developed by the AACS Licensing Administrator, LLC (AACS LA), a consortium that includes Disney, Intel, Microsoft, Matsushita (Panasonic), Warner Brothers, IBM, Toshiba and Sony. In December 2006 a process key was published on the internet by hackers, enabling unrestricted access to AACS-protected HD DVD content. After the cracked keys were revoked, further cracked keys were released.
Open IPTV Forum and national initiatives such as YouView in the UK, Tivu in Italy, and HDForum in France, which are starting to see broad deployments.
DRM and music
Discs with DRM schemes are not standards-compliant Compact Discs (CDs) but are rather CD-ROM media. Therefore they all lack the CD logotype found on discs which follow the standard (known as Red Book). These CDs can not be played on all CD players or personal computers. Personal computers running Microsoft Windows sometimes even crash when attempting to play the CDs.
In 2005, Sony BMG introduced new DRM technology which installed DRM software on users' computers without clearly notifying the user or requiring confirmation. Among other things, the installed software included a rootkit, which created a severe security vulnerability others could exploit. When the nature of the DRM involved was made public much later, Sony BMG initially minimized the significance of the vulnerabilities its software had created, but was eventually compelled to recall millions of CDs, and released several attempts to patch the surreptitiously included software to at least remove the rootkit. Several class action lawsuits were filed, which were ultimately settled by agreements to provide affected consumers with a cash payout or album downloads free of DRM.
Sony BMG's DRM software actually had only a limited ability to prevent copying, as it affected only playback on Windows computers, not on other equipment. Even on the Windows platform, users regularly bypassed the restrictions. And, while the Sony BMG DRM technology created fundamental vulnerabilities in customers' computers, parts of it could be trivially bypassed by holding down the "shift" key while inserting the CD, or by disabling the autorun feature. In addition, audio tracks could simply be played and re-recorded, thus completely bypassing all of the DRM (this is known as the analog hole). Sony BMG's first two attempts at releasing a patch which would remove the DRM software from users' computers failed.
In January 2007, EMI stopped publishing audio CDs with DRM, stating that "the costs of DRM do not measure up to the results." Following EMI, Sony BMG was the last publisher to abolish DRM completely, and audio CDs containing DRM are no longer released by the four largest commercial record label companies.
Many internet music stores employ DRM to restrict usage of music purchased and downloaded.
- Prior to 2009, Apple's iTunes Store utilized the FairPlay DRM system for music. Apple did not license its DRM to other companies, so only Apple devices and Apple’s QuickTime media player could play iTunes music. In May 2007, EMI tracks became available in iTunes Plus format at a higher price point. These tracks were higher quality (256 kbit/s) and DRM free. In October 2007, the cost of iTunes Plus tracks was lowered to US$0.99. In April 2009, all iTunes music became available completely DRM-free. (Videos sold and rented through iTunes, as well as iOS Apps, however, were to continue using Apple's FairPlay DRM.)
- Napster music store offers a subscription-based approach to DRM alongside permanent purchases. Users of the subscription service can download and stream an unlimited amount of music transcoded to Windows Media Audio (WMA) while subscribed to the service. But when the subscription period lapses, all of the downloaded music is unplayable until the user renews his or her subscription. Napster also charges users who wish to use the music on their portable device an additional $5 per month. In addition, Napster gives users the option of paying an additional $0.99 per track to burn it to CD or for the song to never expire. Music bought through Napster can be played on players carrying the Microsoft PlaysForSure logo (which, notably, do not include iPods or even Microsoft's own Zune). As of June 2009, Napster is offering DRM free MP3 music, which can be played on iPhones and iPods.
- Wal-Mart Music Downloads, another music download store, charges $0.94 per track for all non-sale downloads. All Wal-Mart downloads are able to be played on any Windows PlaysForSure marked product. The music does play on the SanDisk's Sansa mp3 player, for example, but must be copied to the player's internal memory. It cannot be played through the player's microSD card slot, which is a problem that many users of the mp3 player experience.
- Sony operated a music download service called "Connect" which used Sony's proprietary OpenMG DRM technology. Music downloaded from this store (usually via Sony's SonicStage software) was only playable on computers running Microsoft Windows and Sony hardware (including the PSP and some Sony Ericsson phones).
- Kazaa is one of a few services offering a subscription-based pricing model. However, music downloads from the Kazaa website are DRM-protected, and can only be played on computers or portable devices running Windows Media Player, and only as long as the customer remains subscribed to Kazaa.
The various services are currently not interoperable, though those that use the same DRM system (for instance the several Windows Media DRM format stores, including Napster, Kazaa and Yahoo Music) all provide songs that can be played side-by-side through the same player program. Almost all stores require client software of some sort to be downloaded, and some also need plug-ins. Several colleges and universities, such as Rensselaer Polytechnic Institute, have made arrangements with assorted Internet music suppliers to provide access (typically DRM-restricted) to music files for their students, to less than universal popularity, sometimes making payments from student activity fee funds. One of the problems is that the music becomes unplayable after leaving school unless the student continues to pay individually. Another is that few of these vendors are compatible with the most common portable music player, the Apple iPod. The Gowers Review of Intellectual Property (to HMG in the UK; 141 pages, 40+ specific recommendations) has taken note of the incompatibilities, and suggests (Recommendations 8—12) that there be explicit fair dealing exceptions to copyright allowing libraries to copy and format-shift between DRM schemes, and further allowing end users to do the same privately. If adopted, some of the acrimony may decrease.
Although DRM is prevalent for Internet music, some online music stores such as eMusic, Dogmazic, Amazon, and Beatport, do not use DRM despite encouraging users to avoid sharing music. Major labels have begun releasing more music without DRM. Eric Bangeman suggests in Ars Technica that this is because the record labels are "slowly beginning to realize that they can't have DRMed music and complete control over the online music market at the same time... One way to break the cycle is to sell music that is playable on any digital audio player. eMusic does exactly that, and their surprisingly extensive catalog of non-DRMed music has vaulted it into the number two online music store position behind the iTunes Store." Apple's Steve Jobs called on the music industry to eliminate DRM in an open letter titled Thoughts on Music. Apple's iTunes Store will start to sell DRM-free 256 kbit/s (up from 128 kbit/s) AAC encoded music from EMI for a premium price (this has since reverted to the standard price).
In March 2007, Musicload.de, one of Europe's largest internet music retailers, announced their position strongly against DRM. In an open letter, Musicload stated that three out of every four calls to their customer support phone service are as a result of consumer frustration with DRM.
Mobile Ring Tones
The Open Mobile Alliance created a standard for interoperable DRM on mobile devices. The first version of OMA DRM consisted of a simple rights management language and was widely used to protect mobile phone ringtones from being copied from the phone to other devices. Later versions expanded the rights management language to similar expressiveness as Fairplay, but did not become widely used.
DRM and television
The CableCard standard is used by cable television providers in the United States to restrict content to services to which the customer has subscribed.
The broadcast flag concept was developed by Fox Broadcasting in 2001 and was supported by the MPAA and the U.S. Federal Communications Commission (FCC). A ruling in May 2005 by a US Court of Appeals held that the FCC lacked authority to impose it on the TV industry in the US. It required that all HDTVs obey a stream specification determining whether or not a stream can be recorded. This could block instances of fair use, such as time-shifting. It achieved more success elsewhere when it was adopted by the Digital Video Broadcasting Project (DVB), a consortium of about 250 broadcasters, manufacturers, network operators, software developers, and regulatory bodies from about 35 countries involved in attempting to develop new digital TV standards.
An updated variant of the broadcast flag has been developed in the Content Protection and Copy Management group under DVB (DVB-CPCM). Upon publication by DVB, the technical specification was submitted to European governments in March 2007. As with much DRM, the CPCM system is intended to control use of copyrighted material by the end-user, at the direction of the copyright holder. According to Ren Bucholz of the EFF, which paid to be a member of the consortium, "You won't even know ahead of time whether and how you will be able to record and make use of particular programs or devices". The DVB claims that the system will harmonize copyright holders' control across different technologies, thereby making things easier for end users. The normative sections have now all been approved for publication by the DVB Steering Board, and will be published by ETSI as a formal European Standard as ETSI TS 102 825-X where X refers to the Part number of specification. Nobody has yet stepped forward to provide a Compliance and Robustness regime for the standard (though several are rumoured to be in development), so it is not presently possible to fully implement a system, as there is nowhere to obtain the necessary device certificates.
Sometimes, metadata is included in purchased media which records information such as the purchaser's name, account information, or email address. Also included may be the file's publisher, author, creation date, download date, and various notes. This information is not embedded in the played content, like a watermark, but is kept separate, but within the file or stream.
As an example, metadata is used in media purchased from Apple's iTunes Store for DRM-free as well as DRM-restricted versions of their music or videos. This information is included as MPEG standard metadata.
Watermarks can be used for different purposes that may include:
- recording the copyright owner
- recording the distributor
- recording the distribution chain
- identifying the purchaser of the music
Watermarks are not complete DRM mechanisms in their own right, but are used as part of a system for copyright enforcement, such as helping provide prosecution evidence for purely legal avenues of rights management, rather than direct technological restriction. Some programs used to edit video and/or audio may distort, delete, or otherwise interfere with watermarks. Signal/modulator-carrier chromatography may also separate watermarks from original audio or detect them as glitches. Additionally, comparison of two separately obtained copies of audio using simple, home-grown algorithms can often reveal watermarks. New methods of detection are currently under investigation by both industry and non-industry researchers.
Laws regarding DRM
Article 11 of the 1996 Digital Millennium Copyright Act (DMCA), while in Europe the treaty has been implemented by the 2001 European directive on copyright, which requires member states of the European Union to implement legal protections for technological prevention measures. In 2006, the lower house of the French parliament adopted such legislation as part of the controversial DADVSI law, but added that protected DRM techniques should be made interoperable, a move which caused widespread controversy in the United States. The Tribunal de Grande Instance Paris concluded in 2006 that the complete blocking of any possibilities of making private copies was an impermissible behaviour under French copyright law.
Digital Millennium Copyright Act
The Digital Millennium Copyright Act (DMCA) is an amendment to United States copyright law, passed unanimously on May 14, 1998, which criminalizes the production and dissemination of technology that allows users to circumvent technical copy-restriction methods. Under the Act, circumvention of a technological measure that effectively controls access to a work is illegal if done with the primary intent of violating the rights of copyright holders. (For a more detailed analysis of the statute, see WIPO Copyright and Performances and Phonograms Treaties Implementation Act.)
Reverse engineering of existing systems is expressly permitted under the Act under specific conditions. Under the reverse engineering safe harbor, circumvention necessary to achieve interoperability with other software is specifically authorized. See 17 U.S.C. Sec. 1201(f). Open-source software to decrypt content scrambled with the Content Scrambling System and other encryption techniques presents an intractable problem with the application of the Act. Much depends on the intent of the actor. If the decryption is done for the purpose of achieving interoperability of open source operating systems with proprietary operating systems, the circumvention would be protected by Section 1201(f) the Act. Cf., Universal City Studios, Inc. v. Corley, 273 F.3d 429 (2d Cir. 2001) at notes 5 and 16. However, dissemination of such software for the purpose of violating or encouraging others to violate copyrights has been held illegal. See Universal City Studios, Inc. v. Reimerdes, 111 F. Supp. 2d 346 (S.D.N.Y. 2000).
The DMCA has been largely ineffective in protecting DRM systems, as software allowing users to circumvent DRM remains widely available. However, those who wish to preserve the DRM systems have attempted to use the Act to restrict the distribution and development of such software, as in the case of DeCSS.
Although the Act contains an exception for research, the exception is subject to vague qualifiers that do little to reassure researchers. Cf., 17 U.S.C. Sec. 1201(g). The DMCA has had an impact on cryptography, because many fear that cryptanalytic research may violate the DMCA. The arrest of Russian programmer Dmitry Sklyarov in 2001, for alleged infringement of the DMCA, was a highly publicized example of the law's use to prevent or penalize development of anti-DRM measures. Sklyarov was arrested in the United States after a presentation at DEF CON, and subsequently spent several months in jail. The DMCA has also been cited as chilling to non-criminal inclined users, such as students of cryptanalysis (including, in a well-known instance, Professor Felten and students at Princeton), and security consultants such as the Netherlands based Niels Ferguson, who has declined to publish information about vulnerabilities he discovered in an Intel secure-computing scheme because of his concern about being arrested under the DMCA when he travels to the US.
On 22 May 2001, the European Union passed the EU Copyright Directive, an implementation of the 1996 WIPO Copyright Treaty that addressed many of the same issues as the DMCA.
On 25 April 2007 the European Parliament supported the first directive of EU, which aims to harmonize criminal law in the member states. It adopted a first reading report on harmonizing the national measures for fighting copyright abuse. If the European Parliament and the Council approve the legislation, the submitted directive will oblige the member states to consider a crime a violation of international copyright committed with commercial purposes. The text suggests numerous measures: from fines to imprisonment, depending on the gravity of the offense. The EP members supported the Commission motion, changing some of the texts. They excluded patent rights from the range of the directive and decided that the sanctions should apply only to offenses with commercial purposes. Copying for personal, non-commercial purposes was also excluded from the range of the directive.
In 2012, the Court of Justice of the European Union ruled in favor of reselling copyrighted games, prohibiting any preventative action that would prevent such transaction. The court said that "The first sale in the EU of a copy of a computer program by the copyright holder or with his consent exhausts the right of distribution of that copy in the EU. A rightholder who has marketed a copy in the territory of a Member State of the EU thus loses the right to rely on his monopoly of exploitation in order to oppose the resale of that copy."
In 2014, the Court of Justice of the European Union ruled that circumventing DRM on game devices may be legal under some circumstances, limiting the legal protection to only cover technological measures intended to prevent or eliminate unauthorised acts of reproduction, communication, public offer or distribution.
In Europe, there are several ongoing dialog activities that are characterized by their consensus-building intention:
- Workshop on Digital Rights Management of the World Wide Web Consortium (W3C), January 2001.
- Participative preparation of the European Committee for Standardization/Information Society Standardization System (CEN/ISSS) DRM Report, 2003 (finished).
- DRM Workshops of Directorate-General for Information Society and Media (European Commission) (finished), and the work of the DRM working groups (finished), as well as the work of the High Level Group on DRM (ongoing).
- Consultation process of the European Commission, DG Internal Market, on the Communication COM(2004)261 by the European Commission on "Management of Copyright and Related Rights" (closed).
- The INDICARE project is an ongoing dialogue on consumer acceptability of DRM solutions in Europe. It is an open and neutral platform for exchange of facts and opinions, mainly based on articles by authors from science and practice.
- The AXMEDIS project is a European Commission Integrated Project of the FP6. The main goal of AXMEDIS is automating the content production, copy protection and distribution, reducing the related costs and supporting DRM at both B2B and B2C areas harmonizing them.
- The Gowers Review of Intellectual Property is the result of a commission by the British Government from Andrew Gowers, undertaken in December 2005 and published in 2006, with recommendations regarding copyright term, exceptions, orphaned works, and copyright enforcement.
Israel is a signatory to, but has not yet ratified, the WIPO Copyright Treaty. Israeli law does not currently expressly prohibit the circumvention of technological measures used to implement digital rights management. The Israeli Ministry of Justice proposed a bill to prohibit such activities in June 2012, but the bill was not passed by the Knesset. In September 2013, the Supreme Court ruled that the current copyright law could not be interpreted to prohibit the circumvention of digital rights management, though the Court left open the possibility that such activities could result in liability under the law of unjust enrichment.
Opposition to DRM
Many organizations, prominent individuals, and computer scientists are opposed to DRM. Two notable DRM critics are Cory Doctorow, a prominent writer and technology blogger, spoke on the Microsoft campus criticizing the technology, the morality, and the marketing of DRM.
There have been numerous others who see DRM at a more fundamental level. This is similar to some of the ideas in Michael H. Goldhaber's presentation about "The Attention Economy and the Net" at a 1997 conference on the "Economics of Digital Information." (sample quote from the "Advice for the Transition" section of that presentation: "If you can't figure out how to afford it without charging, you may be doing something wrong.")
The EFF and similar organizations such as FreeCulture.org also hold positions which are characterized as opposed to DRM.
The final version of the GNU General Public License version 3, as released by the Free Software Foundation, has a provision that 'strips' DRM of its legal value, so people can break the DRM on GPL software without breaking laws like the DMCA. Also, in May 2006, the FSF launched a "Defective by Design" campaign against DRM.
Creative Commons provides licensing options encouraging the expansion of and building upon creative work without the use of DRM. In addition, the use of DRM by a licensee to restrict the freedoms granted by a Creative Commons license is a breach of the Baseline Rights asserted by each license.
Bill Gates spoke about DRM at CES in 2006. According to him, DRM is not where it should be, and causes problems for legitimate consumers while trying to distinguish between legitimate and illegitimate users.According to Steve Jobs, Apple opposes DRM music after a public letter calling its music labels to stop requiring DRM on its iTunes Store. As of January 6, 2009, the iTunes Store is DRM-free for songs.
The Norwegian Consumer rights organization "Forbrukerrådet" complained to Apple Inc. in 2007 about the company's use of DRM in, and in conjunction with, its iPod and iTunes products. Apple was accused of restricting users' access to their music and videos in an unlawful way, and of using EULAs which conflict with Norwegian consumer legislation. The complaint was supported by consumers' ombudsmen in Sweden and Denmark, and is currently being reviewed in the EU. Similarly, the United States Federal Trade Commission held hearings in March 2009 to review disclosure of DRM limitations to customers' use of media products.
DRM opponents argue that the presence of DRM violates existing private property rights and restricts a range of heretofore normal and legal user activities. A DRM component would control a device a user owns (such as a digital audio player) by restricting how it may act with regards to certain content, overriding some of the user's wishes (for example, preventing the user from burning a copyrighted song to CD as part of a compilation or a review). Doctorow has described this possibility as "the right to make up your own copyright laws".
An example of this restriction to legal user activities may be seen in Microsoft's Windows Vista operating system in which content using a Protected Media Path is disabled or degraded depending on the DRM scheme's evaluation of whether the hardware and its use are 'secure'. All forms of DRM depend on the DRM enabled device (e.g., computer, DVD player, TV) imposing restrictions that (at least by intent) cannot be disabled or modified by the user. Key issues around DRM such as the right to make personal copies, provisions for persons to lend copies to friends, provisions for service discontinuance, hardware agnosticism, software and operating system agnosticism, contracts for public libraries, and customers' protection against one-side amendments of the contract by the publisher have not been fully addressed.(see references 80-89) It has also been pointed out that it is entirely unclear whether owners of content with DRM are legally permitted to pass on their property as inheritance to another person.
Tools like FairUse4WM have been created to strip Windows Media of DRM restrictions.
Valve Corporation President Gabe Newell also stated "most DRM strategies are just dumb" because they only decrease the value of a game in the consumer's eyes. Newell suggests that the goal should instead be "[creating] greater value for customers through service value".
At the 2012 Game Developers Conference, the CEO of CD Projekt Red, Marcin Iwinski, announced that the company will not use DRM in any of its future releases. Iwinski stated of DRM, "it's just over-complicating things. We release the game. It's cracked in two hours, it was no time for Witcher 2. What really surprised me is that the pirates didn't use the GOG version, which was not protected. They took the SecuROM retail version, cracked it and said 'we cracked it' – meanwhile there's a non-secure version with a simultaneous release. You'd think the GOG version would be the one floating around." Iwinski added after the presentation, "DRM does not protect your game. If there are examples that it does, then people maybe should consider it, but then there are complications with legit users."
Bruce Schneier argues that digital copy prevention is futile: "What the entertainment industry is trying to do is to use technology to contradict that natural law. They want a practical way to make copying hard enough to save their existing business. But they are doomed to fail." He has also described trying to make digital files uncopyable as being like "trying to make water not wet". The creators of StarForce also take this stance, stating that "The purpose of copy protection is not making the game uncrackable - it is impossible."
The Association for Computing Machinery and the Institute of Electrical and Electronics Engineers have historically opposed DRM, even going so far as to name AACS as a technology "most likely to fail" in an issue of IEEE Spectrum.
In reaction to opposition to DRM, many publishers and artists label their works as "DRM-free". Major companies that have done so include the following:
- Apple Inc. sold DRM content on their iTunes Store when it started 2003, but made music DRM-free after April 2007 and has been labeling all music as "DRM-Free" since January 2009. The music still carries a digital watermark to identify the purchaser. Other works sold on iTunes such as e-books, movies, TV shows, audiobooks and apps continue to be protected by DRM.
- GOG.com, a digital distributor started in 2008, specialized in the distribution of PC video games. While most other digital distribution services allow various forms of DRM (or have them embedded) gog.com has a strict non-DRM policy.
- Tor Books, a major publisher of science fiction and fantasy books, started selling DRM-free e-books in July 2012. Smaller e-book publishers such as O'Reilly Media and Baen Books had already forgone DRM previously.
- Since 2014, Comixology, which distributes digital comics, allows rights holders to provide the option of a DRM-free download of purchased comics. Publishers which allow this include Image Comics, Dynamite Entertainment, Zenescope Entertainment, Thrillbent and Top Shelf Productions.
Methods to bypass DRM
There are many methods to bypass DRM control on audio, video, and ebook content.
DRM bypass methods for audio and video content
One simple method to bypass DRM on audio files is to burn the content to an audio CD and then rip it into DRM-free files. Some software products simplify and automate this burn-rip process by allowing the user to burn music to a CD-RW disc or to a Virtual CD-R drive, then automatically ripping and encoding the music, and automatically repeating this process until all selected music has been converted, rather than forcing the user to do this one CD (72–80 minutes worth of music) at a time.
Many software programs have been developed that intercept the data stream as it is decrypted out of the DRM-restricted file, and then use this data to construct a DRM-free file. These programs require a decryption key. Programs that do this for DVDs, HD DVDs, and Blu-ray Discs include universal decryption keys in the software itself. Programs that do this for TiVo ToGo recordings, iTunes audio, and PlaysForSure songs, however, rely on the user's own key — that is, they can only process content that the user has legally acquired under his or her own account.
Another method is to use software to record the signals being sent through the audio or video cards, or to plug analog recording devices into the analog outputs of the media player. These techniques utilize the "analog hole."
All forms of DRM for audio and visual material (excluding interactive materials, e.g., videogames) are subject to the analog hole, namely that in order for a viewer to play the material, the digital signal must be turned into an analog signal containing light and/or sound for the viewer, and so available to be copied as no DRM is capable of controlling content in this form. In other words, a user could play a purchased audio file while using a separate program to record the sound back into the computer into a DRM-free file format.
All DRM to date can therefore be bypassed by recording this signal and digitally storing and distributing it in a non DRM limited form, by anyone who has the technical means of recording the analog stream. Furthermore, the analog hole vulnerability cannot be overcome without the additional protection of externally imposed restrictions, such as legal regulations, because the vulnerability is inherent to all analog means of transmission. However, the conversion from digital to analog and back is likely to force a loss of quality, particularly when using lossy digital formats. HDCP is an attempt to plug the analog hole, although it is largely ineffective.
Asus released a soundcard which features a function called "Analog Loopback Transformation" to bypass the restrictions of DRM. This feature allows the user to record DRM-restricted audio via the soundcard's built-in analog I/O connection.
In order to prevent this exploit there has been some discussions between copyright holders and manufacturers of electronics capable of playing such content, to no longer include analog connectivity in their devices. The movement dubbed as "Analog Sunset" has seen a steady decline in analog output options on most Blu-ray devices manufactured after 2010.
DRM on general computing platforms
Many of the DRM systems in use are designed to work on general purpose computing hardware, such as desktop PCs apparently because this equipment is felt to be a major contributor to revenue loss from disallowed copying. Large commercial copyright infringers ("pirates") avoid consumer equipment, so losses from such infringers will not be covered by such provisions.
Such schemes, especially software based ones, can never be wholly secure since the software must include all the information necessary to decrypt the content, such as the decryption keys. An attacker will be able to extract this information, directly decrypt and copy the content, which bypasses the restrictions imposed by a DRM system.
DRM on purpose-built hardware
Many DRM schemes use encrypted media which requires purpose-built hardware to hear or see the content. This appears to ensure that only licensed users (those with the hardware) can access the content. It additionally tries to protect a secret decryption key from the users of the system.
While this in principle can work, it is extremely difficult to build the hardware to protect the secret key against a sufficiently determined adversary. Many such systems have failed in the field. Once the secret key is known, building a version of the hardware that performs no checks is often relatively straightforward. In addition user verification provisions are frequently subject to attack, pirate decryption being among the most frequented ones.
A common real-world example can be found in commercial direct broadcast satellite television systems such as DirecTV and Malaysia's Astro. The company uses tamper-resistant smart cards to store decryption keys so that they are hidden from the user and the satellite receiver. However, the system has been compromised in the past, and DirecTV has been forced to roll out periodic updates and replacements for its smart cards.
Watermarks can often be removed, although degradation of video or audio can occur.
Undecrypted copying failure
Mass piracy of hard copies does not necessarily need DRM to be decrypted or removed, as it can be achieved by bit-perfect copying of a legally obtained medium without accessing the decrypted content. Additionally, still-encrypted disk images can be distributed over the Internet and played on legitimately licensed players.
When standards and formats change, it may be difficult to transfer DRM-restricted content to new media. Additionally, any system that requires contact with an authentication server is vulnerable to that server becoming unavailable, as happened in 2007 when videos purchased from Major League Baseball (mlb.com) prior to 2006 became unplayable due to a change to the servers that validate the licenses.
Amazon PDF and LIT ebooks In August 2006, Amazon stopped selling DRMed PDF and .LIT format ebooks. Customers were unable to download purchased ebooks 30 days after that date, losing access to their purchased content on new devices.
Microsoft Zune When Microsoft introduced their Zune media player in 2006, it did not support content that uses Microsoft's own PlaysForSure DRM scheme they had previously been selling. The EFF calls this "a raw deal".
MSN Music In April 2008, Microsoft sent an email to former customers of the now-defunct MSN Music store: "As of August 31, 2008, we will no longer be able to support the retrieval of license keys for the songs you purchased from MSN Music or the authorization of additional computers. You will need to obtain a license key for each of your songs downloaded from MSN Music on any new computer, and you must do so before August 31, 2008. If you attempt to transfer your songs to additional computers after August 31, 2008, those songs will not successfully play."
However, to avoid a public relations disaster, Microsoft re-issued MSN Music shutdown statement on June 19 and allowed the users to use their licenses until the end of 2011: "After careful consideration, Microsoft has decided to continue to support the authorization of new computers and devices and delivery of new license keys for MSN Music customers through at least the end of 2011, after which we will evaluate how much this functionality is still being used and what steps should be taken next to support our customers. This means you will continue to be able to listen to your purchased music and transfer your music to new PCs and devices beyond the previously announced August 31, 2008 date."
Yahoo! Music Store On July 23, 2008, the Yahoo! Music Store emailed its customers to tell them it will be shutting down effective September 30, 2008 and the DRM license key servers will be taken offline.
Walmart In August 2007, Walmart's online music division started offering (DRM-free) MP3s as an option. Starting in February 2008, they made all sales DRM-free.
On September 26, 2008, the Walmart Music Team notified its customers via email they will be shutting down their DRM servers October 9, 2008 and any DRM-encumbered music acquired from them will no longer be accessible unless ripped to a non-DRM format before that date.
After bad press and negative reaction from customers, on October 9, 2008, Walmart decided not to take its DRM servers offline.
Fictionwise / Overdrive In January 2009, OverDrive informed Fictionwise that they would no longer be providing downloads for purchasers of e-books through Fictionwise as of 31 January 2009. No reason was provided to Fictionwise as to why they were being shut down. This prevents previous purchasers from being able to renew their books on new devices. Fictionwise is working to provide replacement ebooks for its customers in alternative, non-DRM formats, but does not have the rights to provide all of the books in different formats.
Ads for Adobe PDF Also in January 2009, Adobe Systems announced that as of March 2009 they would no longer operate the servers that served ads to their PDF reader. Depending on the restriction settings used when PDF documents were created, they may no longer be readable.
Adobe Content Server 3 for Adobe PDF In April 2009, Adobe Systems announced that as of March 30, 2009 the Adobe Content 3 server would no longer activate new installations of Adobe Reader or Adobe Acrobat. In addition, the ability to migrate content from Adobe Content Server 3 to Adobe Content Server 4 would cease from mid-December 2009. Anyone who failed to migrate their DRMed PDF files during this nine month window lost access to their content the next time they had to re-install their copy of Adobe Reader or Adobe Acrobat.
Harper Collins ebook store In November 2010, Harper Collins announced that as of November 19, 2010, their eBook Store was discontinued, and advised all customers to download and archive their purchases before December 19, 2010, when purchased titles would no longer be accessible. Loss of access to Mobipocket ebooks on new devices.
CyberRead ebook store In February 2011, CyberRead announced that they were closing down, and advised all customers to download and archive their purchases. Loss of access to Mobipocket ebooks on new devices.
Microsoft Reader and .lit ebooks In August 2011, Microsoft announced they were discontinuing both Microsoft Reader and the use of the .lit format for ebooks at the end of August 2012. The activation servers are now offline, and it is not possible to read DRMed .lit ebooks except on an installation made before the servers were taken down. 
Fictionwise In November 2012, Fictionwise announced that they were shutting down. Access to ebook downloads stopped on 31 January 2013. US and UK customers had a limited time-window (up to 26 April 2013) to opt-in to a transfer of (most of) their Fictionwise library to a Barnes & Nobel/NOOK UK account. Customers outside the US and UK lost access to new downloads of their books. For books in the secure Mobipocket format, this meant that customers would not be able to read the book on any new devices.
JManga ebook store In March 2013, JManga announced that they were closing down, and advised all customers that they would lose all access to their content in May 2013.
Waterstones ebook store In March 2013, Waterstones announced that they were making changes to their eBook store, and advised customers that some of their ebooks would become unavailable for download after 18 April 2013. Waterstones advised affected customers to download before then. Any customer who had not kept their own backups and missed this 31-day window lost their ebooks.
Acetrax Video on Demand In May 2013, Acetrax announced they were shutting down. Refunds were provided for purchases of HD movies, but for standard definition versions, the only option made available was a limited time option to download to a Windows PC, but the movie would then be locked to that particular installation of Microsoft Media Player. Non-Windows users lost access to their SD movies.
Sony Reader Store In February 2014, Sony announced that their US ebook store would be closing by the end of March 2014. Accounts were transferred to Kobo, but not all books in Sony accounts could be transferred. In May 2014, Sony announced that their European and Australian ebook stores would be closing on 16 June 2014, with similar arrangements for transfer to Kobo accounts. Customers were advised to download all their ebooks before the closing date, because not all books could be transferred.
DRM can accelerate hardware obsolescence, turning it into electronic waste sooner:
- DRM-related restrictions on capabilities of hardware can artificially reduce the range of potential uses of the device (to the point of making a device consisting of general-purpose components usable only for a purpose approved, or with “content” provided, by the vendor), limit upgradeability and repairability. Cf. proprietary abandonware, orphan works, planned obsolescence. Examples:
- Users may be forced to buy new devices for compatibility with DRM, i.a. through having to upgrade an operating system to one with different hardware requirements.
Moral and legitimacy implications
According to the EFF, "in an effort to attract customers, these music services try to obscure the restrictions they impose on you with clever marketing."
DRM laws are widely flouted: according to Australia Official Music Chart Survey, copyright infringements from all causes are practised by millions of people.
Relaxing some forms of DRM can be beneficial
Jeff Raikes, ex-president of the Microsoft Business Division, stated: "If they're going to pirate somebody, we want it to be us rather than somebody else". An analogous argument was made in an early paper by Kathleen Conner and Richard Rummelt. A subsequent study of digital rights management for ebooks by Gal Oestreicher-Singer and Arun Sundararajan showed that relaxing some forms of DRM can be beneficial to digital rights holders because the losses from piracy are outweighed by the increases in value to legal buyers.
Also, free distribution, even if unauthorized, can be beneficial to small or new content providers by spreading and popularizing content and therefore generating a larger consumer base by sharing and word of mouth. Several musicians have grown to popularity by posting their music videos on sites like YouTube where the content is free to listen to. This method of putting the product out in the world free of DRM not only generates a greater following but also fuels greater revenue through other merchandise (hats, T-shirts), concert tickets, and of course, more sales of the content to paying consumers.
Can increase piracy
While the main intent of DRM is to prevent unauthorized copies of a product, there are mathematical models that suggest that DRM can fail to do their job on multiple levels. Ironically, the biggest failure that can result from DRM is that they have a potential to increase the piracy of a product. This goes against the held belief that DRM can always reduce piracy. There also seems to be evidence that DRM will reduce profits.
The driving factor behind why DRM have the potential to increase piracy is related to how many restrictions they impose on a legal buyer. An ideal DRM would be one which imposes zero restrictions on legal buyers but makes imposing restrictions on pirates. Even if an ideal DRM can be created and used, in certain cases, it can be shown that removing the DRM will result in less piracy. This is also true when the DRM is not ideal and it does impose restrictions on legal buyers. The reason for this is because, when the DRM is imposed, pirates are able to lift the restrictions set by it. This leads pirates being able to get more utility out of the product than legal consumers and this is what causes the increase in piracy.
The important factor for companies is how all of this affects their profits. As mentioned, removing DRM will increase profits whether the DRM are ideal or not. Removing DRM can make the product cheaper. For the ideal DRM, the reason why profits can increase is because of the price elasticity of demand is elastic. Since there are also less people pirating and more people legally buying, more profits are going to be made. For the non-ideal DRM this is also true, especially when there are a high number of restrictions associated with it.
The mathematical models are strictly applied to the music industry (music CDs, downloadable music). These models could be extended to the other industries such as the gaming industry which show similarities to the music industry model. There are real instances when DRM restrain consumers in the gaming industry. Some DRM games are required to connect to the internet in order to play them. If one can't connect to the internet or if the service is down, one can't play. Good Old Games' head of public relations and marketing, Trevor Longino, in agreement with this, believes that using DRM is less effective than improving a game's value in reducing video game piracy. However, TorrentFreak published a "Top 10 pirated games of 2008" list which shows that intrusive DRM is not the main reason why some games are pirated more heavily than others. Popular games such as BioShock, Crysis Warhead, and Mass Effect which use intrusive DRM are strangely absent from the list.
Alternatives to DRM
Several business models have been proposed that offer an alternative to the use of DRM by content providers and rights holders.
"Easy and cheap"
The first business model that dissuades illegal file sharing is to make the downloading easy and cheap. The use of a noncommercial site makes downloading music complex. If someone misspells the artist's name, the search will leave the consumer dissatisfied. Also, some illegal file sharing websites lead to many viruses and malware that attach themselves to the files, somewhat in a way of torrent poisoning. Some sites limit the traffic, which can make downloading a song a long and frustrating process. If the songs are all provided on one site, and reasonably priced, consumers will purchase the music legally to overcome the frustrations such as media files appearing empty or failing to play smoothly/correctly occasionally on DRM'ed players and pcs giving a risky feel to the potential "sharer" that can occur downloading illegally.
Comedian Louis C.K. made headlines in 2011 with the release of his concert film Live at the Beacon Theater as an inexpensive ($5), DRM-free download. The only attempt to deter piracy was a letter emphasizing the lack of corporate involvement and direct relationship between artist and viewer. The film was a commercial success, turning a profit within 12 hours of its release. Some, including the artist himself, have suggested that piracy rates were lower than normal as a result, making the release an important case study for the digital marketplace.
Webcomic Diesel Sweeties released a DRM-free PDF ebook on author R Stevens's 35th birthday, leading to more than 140,000 downloads in the first month, according to Stevens. He followed this with a DRM-free iBook specifically for the iPad, using Apple's new software, which generated more than 10,000 downloads in three days. That led Stevens to launch a Kickstarter project – "ebook stravaganza 3000" – to fund the conversion of 3,000 comics, written over 12 years, into a single "humongous" ebook to be released both for free and through the iBookstore; launched February 8, 2012, with the goal of raising $3,000 in 30 days, the project met its goal in 45 minutes, and went on to be funded at more than 10 times its original goal. The "payment optional" DRM-free model in this case was adopted on Stevens' view that "there is a class of webcomics reader who would prefer to read in large chunks and, even better, would be willing to spend a little money on it."
In February 2012 Double Fine asked for an upcoming video game, Double Fine Adventure, for crowdfunding on kickstarter.com and offered the game DRM-free for backers. This project exceeded its original goal of $400,000 in 45 days, raising in excess of $2 million. In this case DRM free was offered to backers as an incentive for supporting the project pre-release, with the consumer/community support and media attention from the highly successful Kickstarter drive counterbalancing Also, crowdfunding with the product itself as benefit for the supporters can be seen as pre-order or subscription business model in which one motivation for DRM, the uncertainty if a product will have enough paying customers to outweight the development costs, is eliminated. After the success of Double Fine Adventure many games were crowdfunded and many of them offered a DRM-free game version for the backers.
Digital content as promotion for traditional products
Many artists are using the Internet to give away music to create awareness and liking to a new upcoming album. The artists release a new song on the internet for free download, which consumers can download. The hope is to have the listeners buy the new album because of the free download. A common practice used today is releasing a song or two on the internet for consumers to indulge. In 2007, Radiohead released an album named In Rainbows, in which fans could pay any amount they want, or download it for free.
Artistic Freedom Voucher
The Artistic Freedom Voucher (AFV) introduced by Dean Baker is a way for consumers to support “creative and artistic work.” In this system, each consumer would have a refundable tax credit of $100 to give to any artist of creative work. To restrict fraud, the artists must register with the government. The voucher prohibits any artist that receives the benefits from copyrighting their material for a certain length of time. Consumers can obtain music for a certain amount of time easily and the consumer decides which artists receive the $100. The money can either be given to one artist or to many, the distribution is up to the consumer.
A very early implementation of DRM was the Software Service System (SSS) devised by the Japanese engineer Ryoichi Mori in 1983  and subsequently refined under the name superdistribution. The SSS was based on encryption, with specialized hardware that controlled decryption and also enabled payments to be sent to the copyright holder. The underlying principle of the SSS and subsequently of superdistribution was that the distribution of encrypted digital products should be completely unrestricted and that users of those products would not just be permitted to redistribute them but would actually be encouraged to do so.
- Damaged good
- Data room
- Digital asset management
- Floating licensing
- Hardware restrictions
- License manager
- Open Music Model
- Product activation
- Smart contract
- Smart cow problem
- Software metering
- Software protection dongle
- Trusted Computing
- Voluntary Collective Licensing
- DVD Copy Control Association, Inc. v. Bunner
- DVD Copy Control Association, Inc. v. Kaleidescape, Inc.
- RealNetworks, Inc. v. DVD Copy Control Association, Inc.
- Universal v. Reimerdes
- DigitalEurope – European Information, Communications and Consumer Electronics Technology Industry Associations
- Trusted Computing Group
- Motion Picture Association of America
- Recording Industry Association of America
- Open Rights Group
- Pirate Party, a Swedish political party which is a proponent of free culture and free knowledge
- Free Software Foundation Europe
- Secure Digital Music Initiative
- "22: Copyright and DRM". Security Engineering. WILEY.
- "The Changing Attitude Toward DRM". Digital Rights Management: Business and Technology. M&T Books.
- Digital rights management for content distribution. Dl.acm.org. Retrieved on 2013-07-29.
- "Definitions, Aspects, and Overview". Digital Rights Management: Technological, Economic, Legal and Political Aspects (Lecture Notes in Computer Science).
- "Fact Sheet: Digital Rights Management and have to do: Technical Protection Measures". Priv.gc.ca. November 24, 2006. Retrieved 2013-07-29.
- Computer Forensics: Investigating Network Intrusions and Cybercrime.
- Hwang, Jenq-Neng (2009). Multimedia Networking: From Theory to Practice.
- "Images and the Internet".
- Christopher Levy (February 3, 2003). "Making Money with Streaming Media". streamingmedia.com. Archived from the original on 2006-05-14. Retrieved 2006-08-28.
- "The pros, cons, and future of DRM". Cbc.ca. 2009-08-07. Retrieved 2012-01-07.
- "DRM | Electronic Frontier Foundation". Eff.org. Retrieved 2012-01-07.
- "The DRM graveyard: A brief history of digital rights management in music". opensource.com. 3 November 2011. Retrieved 2012-01-07.
- Natali Helberger (01/03/06). "Christophe R. vs Warner Music: French court bans private-copying hostile DRM". INDICARE. Retrieved 31 May 2014.
- "FairPlay: Another Anti-competitive Use of DRM". Retrieved 2012-09-06.
- "Fair Use and DRM". W2.eff.org. Retrieved 2012-01-07.
- "MediaDaily News, "QuickPlay Distributes TV Over Mobile Wi-Fi" November 12, 2009". Mediapost.com. Retrieved 2012-02-20.
- Bobbie Johnson, San Francisco (6 January 2009). "Apple drops copy protection from iTunes". Guardian. Retrieved 2012-06-06.
- "Digital Rights Management Systems and Copy Protection Schemes,"  DRM
- Kranich, Nancy. "Chap 1(pg.8)." The Information Commons. Creative Commons, 2004. Print.
- Ernesto (December 4, 2008). "Top 10 Most Pirated Games of 2008". TorrentFreak. Retrieved 2011-11-24.
- Andy Greenberg; Mary Jane Irwin (2008-09-12). "Spore's Piracy Problem". Forbes. Retrieved 2011-10-22.
- Koroush Ghazi (2008-12-14). "PC Game Piracy Examined: Page 4". Tweakguides. Retrieved 2011-11-24.
- "The Sims 3 Will Not Use DRM: News from". 1UP.com. 2009-03-29. Retrieved 2010-08-31.
- Kuchera, Ben (2008-12-12). "PC Prince of Persia contains no DRM. It's a trap!". Arstechnica.com. Retrieved 2010-08-31.
- Koroush Ghazi (2008-12-11). "PC Game Piracy Examined: Page 8". Tweakguides. Retrieved 2012-12-03.
- Ubisoft (February 9, 2010). "Ubisoft Press Release". Ubisoft. Retrieved 2010-03-04.
- Nic Simmonds (March 4, 2010). "Ubisoft's contentious DRM scheme already hacked". MyGaming. Retrieved 2010-03-04.
- Andy Chalk (March 4, 2010). "Ubisoft Denies Launch Day Crack for Silent Hunter 5 DRM". Escapist Magazine. Retrieved 2010-03-27.
- Ben Kuchera (February 18, 2010). "Official explanation of controversial Assassin's Creed 2 DRM". Escapist Magazine. Retrieved 2010-03-27.
- "Ubisoft's DRM for Assassin's Creed II is Cracked". Tomshardware.com. 23 April 2010. Retrieved 2010-08-31.
- Lowensohn, Josh (21 April 2010). "Ubisoft's controversial 'always on' PC DRM hacked". News.cnet.com. Retrieved 2010-08-31.
- John Leyden (March 8, 2010). "Ubisoft undone by anti-DRM DDoS storm". The Register. Retrieved 2010-03-27.
- Andre Yoskowitz (March 8, 2010). "Ubisoft apologizes to users affected by 'always on' DRM". Afterdawn. Retrieved 2010-03-27.
- Summer Walker (March 20, 2013). "SimCity Modder Catches EA Lying". Gamebreaker TV. Retrieved 2013-03-28.
- Nathan Grayson (November 17, 2011). "Interview: Bohemia Interactive's CEO on fighting piracy, creative DRM". pcgamer.com.
- John Walker (December 7, 2011). "Serious Sam's DRM Is A Giant Pink Scorpion". rockpapershotgun.com. Retrieved 2011-12-09.
- socketboy (December 8, 2011). "Serious Sam 3 Non-Traditional DRM Solutions Part 2". ign.com. Retrieved 2011-12-09.
- Digital Right Management
- CIRCUMVENTING ACCESS CONTROLS UNDER THE DIGITAL MILLENNIUM COPYRIGHT ACT:ANALYZING THE SECUROM DEBATE
- DRM vs. ERM: Battle to Control Data", Network World""". Retrieved 2008-04-02.
- "NASCA is a DRM solution...". Retrieved 2013-07-16.
- TinHat (June 2006). "eBooks and Digital Rights Management (DRM), for ePublishers". tinhat.com. Retrieved 2008-05-28.
- "Topaz". Mobileread.com. mobileread.com. Retrieved 21 August 2012.
- Stone, Brad (2009-07-18). "Amazon Erases Orwell Books From Kindle Devices". New York Times. Retrieved 2010-05-01.
- David Pogue (2009-07-17). "Some E-Books Are More Equal Than Others". New York Times.
- Pete Cashmore (July 17, 2009). "Big Brother: Amazon Remotely Deletes 1984 From Kindles".
- Mark Frauenfelder (July 17, 2009). "Amazon zaps purchased copies of Orwell's 1984 and Animal Farm from Kindles".
- Ina Fried (July 17, 2009). "'"Amazon recalls (and embodies) Orwell's '1984.
- "Why Amazon went Big Brother on some Kindle e-books".
- Kelty, Christopher M., "The disappearing virtual library", Al Jazeera, March 1, 2012
- "Rights Management in the Enterprise". Retrieved 2013-12-03.
- "Windows Media Player DRM: frequently asked questions". Retrieved 2013-06-22.
- Xeni Jardin (2006-12-28). "Report: HD-DVD copy protection defeated". BoingBoing. Retrieved 2008-01-01.
- Cory Doctorow (2007-05-30). "New AACS processing key leaks onto the net". BoingBoing. Retrieved 2008-01-01.
- Lewis, Rita (January 8, 2008). "What is DRM and Why Should I Care?". Firefox News. Retrieved July 10, 2008.
- McMillan, Robert (May 23, 2006). "Settlement Ends Sony Rootkit Case".
- Marechal, Sander (January 9, 2007). "DRM on audio CDs abolished".
- Holahan, Catherine (January 4, 2008). "Sony BMG Plans to Drop DRM".
- "iTunes Plus DRM-free tracks expanding, dropping to 99 cents". Apple News from ARS Technica. 2007-10-16. Retrieved 2007-10-16.
- Nick Timeraos (July 6, 2006). "Free, Legal and Ignored".
- Eric Bangeman (December 6, 2006). "Testing DRM-free waters: EMI selling a few MP3s through Yahoo Music". Ars Technica.
- Steve Jobs. "Thoughts on Music".
- Ken Fisher (March 18, 2007). "Musicload: 75% of customer service problems caused by DRM". Ars Technica. Retrieved 2007-03-20.
- "Who Controls Your Television?". Electronic Frontier Foundation. Retrieved 2008-01-01.
- "Tunes Plus DRM-free, not free of annoying glitches".
- "Watermarked iTunes files".
- Doctorow, Cory (2007-03-24). "DMCA's author says the DMCA is a failure, blames record industry". Retrieved 2011-01-12.
- "RIAA challenges SDMI attack". 2002-01-07. Retrieved 2007-02-26.
- "European Court of Justice rules on the right to sell your digital games and licenses". PC Gamer. Retrieved 8 October 2014.
- Greg Voakes (3 July 2012). "European Courts Rule In Favor Of Consumers Reselling Downloaded Games". Forbes. Retrieved 8 October 2014.
- "Europe's Highest Court Says DRM Circumvention May Be Lawful In Certain Circumstances". Techdirt. Retrieved 8 October 2014.
- "DRM Circumvention May Be Legal, European Union Court Rules". The Escapist. 23 January 2014. Retrieved 8 October 2014.
- "W3C Workshop - Digital Rights Management for the Web". W3.org. Retrieved 2010-08-31.
- European Commission - Information Society - eEurope 2005 - eEurope 2005 Action Plan http://collection.europarchive.org/dnb/20070405123415/ec.europa.eu/information_society/eeurope/2005/all_about/action_plan/index_en.htm
- "The address you requested is obsolete". Europa.eu.int. 2009-02-23. Retrieved 2010-08-31.
- "Israel Technology Law Blog - No Digital Rights Management Here".
- Walker, John (September 13, 2003). "The Digital Imprimatur: How big brother and big media can put the Internet genie back in the bottle.".
- O'Riordan, Ciaran (January 16, 2006). "Transcript of Opening session of first international GPLv3 conference".
- "Opposing Digital Rights Mismanagement (Or Digital Restrictions Management, as we now call it)?". Retrieved 2014-05-29.
- "Software Security -- Theories and Systems". Retrieved 8 October 2014.
- "The Impact of Electronic Publishing". Retrieved 8 October 2014.
- "Industrial Organization and the Digital Economy". Retrieved 8 October 2014.
- "Innovations and Advanced Techniques in Computer and Information Sciences and ...". Retrieved 8 October 2014.
- "The Attention Economy and the Net". Retrieved 28 July 2008.
- "Frequently Asked Questions about the GNU Licenses - GNU Project - Free Software Foundation". FSF. 2010-07-28. Retrieved 2010-08-31.
- "The Campaign to Eliminate DRM". DefectiveByDesign.org. Retrieved 2010-08-31.
- "Frequently Asked Questions - CcWiki". 2006-11-09. Retrieved 2006-11-22.
- "Baseline Rights - Creative Commons Wiki". 2007-07-13. Retrieved 2007-12-23.
- "Bill Gates On The Future Of DRM.".
- apple.com (2009-01-06). "Changes Coming to the iTunes Store". Retrieved 2009-03-08.
- "FTC Town Hall to Address Digital Rights Management Technologies".
- DRM Is The Right To Make Up Your Own Copyright Laws - Mike Masnick, Techdirt, 6 February 2014
- "What Content Will Be Crippled When Output in Vista?". Retrieved 2010-09-08.
- "Why is Netflix ignoring Linux?". Retrieved 2010-09-08.
- Why the Kindle's DRM is anti-elderly: AARP should fight against it, February 26, 2009
- "Engadget FairUse4WM strips Windows Media DRM!". Retrieved 2006-08-25.
- "'"Gabe Newell Says DRM Strategies 'Are Just Dumb. 2008-12-02.
- Kain, Eric. "'Witcher 2' Developer: 'We Will Never Use Any DRM Anymore'". Forbes. Retrieved 2012-03-30.
- The Futility of Digital Copy Prevention Crypto-Gram Newsletter, May 15, 2001
- Bruce Schneier (09.07.06). "Quickest Patch Ever". Wired. Retrieved 2010-02-15.
- "Official words of StarForce on DRM". Retrieved 2010-09-08.
- Tekla S. Perry (January 2007). "Loser: DVD Copy Protection, Take 2". Spectrum Online. Retrieved 2007-05-04.
- "Apple Unveils Higher Quality DRM-Free Music on the iTunes Store". Retrieved 2008-09-13.
- "Apple hides account info in DRM-free music, too". Retrieved 2008-09-13.
- "Apple announces all music on iTunes to go DRM-free -- no word on movies, TV shows, games, audiobooks and applications". 2009-01-08.
Caron, Frank (2008-09-09). "First look: GOG revives classic PC games for download age". Ars Technica. Retrieved 2012-12-27.
[...] [Good Old Games] focuses on bringing old, time-tested games into the downloadable era with low prices and no DRM.
- "Tor/Forge E-book Titles to Go DRM-Free". Tor.com. Retrieved 24 April 2012.
- "Amazon's comixology introduces DRM-free downloads". The Guardian. 25 July 2014. Retrieved 30 July 2014.
- Sicker, Douglas, Paul Ohm, and Shannon Gunaji. "The Analog Hole and the Price of Music: An Empirical Study". Journal of Tellecommunications and High Technology. 2006–2007.
- "MPAA shows how to videorecord a TV set". Retrieved 2009-09-04.
- Security and Privacy in Digital Rights Management. Retrieved 2009-09-04.
- "Asus Showcases New Generation Audio Card at Computex 2007". Retrieved 2007-06-26.
- "PC Pro Product Reviews Asus Xonar D2". Pcpro.co.uk. 2007-08-01. Retrieved 2012-02-20.
- "MLB Fans Who Bought DRM Videos Get Hosed". slashdot.org. November 7, 2007. Retrieved 2007-11-08.
- "Amazon Drops Lit/Pdf eBooks". Mobileread. August 4, 2006. Retrieved 2011-03-22.
- Hancock, Georganna (September 17, 2006). "Amazon Drops eBooks". Retrieved 2011-03-22.
- "Zune Won't Play Old DRM Infected Files". slashdot.org. September 19, 2006. Retrieved 2007-09-19.
- Slater, Derek (September 15, 2006). "Microsoft's Zune Won't Play Protected Windows Media". Electronic Frontier Foundation. Retrieved 2008-09-27.
- Cheng, Jacqui (April 22, 2008). "DRM sucks redux: Microsoft to nuke MSN Music DRM keys". Ars Technica. Retrieved 2008-04-22.
- Thurrott, Paul (June 19, 2008). "MSN Music Store Support Notification". Winsupersite. Retrieved 2008-06-19.
- Anderson, Nate (July 24, 2008). "DRM still sucks: Yahoo Music going dark, taking keys with it". Ars Technica. Retrieved 2012-05-18.
- Doctorow, Cory (September 26, 2008). "Wal*Mart shutting down DRM server, nuking your music collection--only people who pay for music risk losing it to DRM shenanigans". Boing Boing. Retrieved 2008-09-26.
- Murph, Darren (October 10, 2008). "Walmart has a change of heart, decides to maintain DRM servers". Weblogs, Inc. Retrieved 2008-10-10.
- "Fictionwise Support FAQ". Retrieved 8 January 2009.
- "Ads for AdobePDF discontinued". Retrieved 2009-01-15.
- "Adobe Content 3 Server Discontinued". Retrieved 2011-02-22.
- "HarperCollins ebook Store Discontinued". Retrieved 2011-02-23.
- "CyberRead ebook Store Discontinued". Retrieved 2011-02-23.
- "Microsoft retires MS Reader along with any the LIT format.". Retrieved 2014-10-11.
- "Fictuonwise has shut down!". Retrieved 2013-05-23.
- "JManga ebook Store Discontinued". Retrieved 2013-03-17.
- "Waterstones customers losing access to some of their books". Retrieved 2013-03-23.
- "VOD Service Acetrax Shutting Down, Forcing Customers Through DRM Hoops To Retain Their Purchased Movies". Retrieved 2013-05-23.
- "US Sony Reader Store Closing". Retrieved 2014-06-02.
- "European/Australian Sony Reader Store Closing". Retrieved 2014-06-02.
- Heller, Gregory (26 January 2007). Wow starts now"? Software Freedom Activists Stand Up To VISTA Launch""". Defective By Design.org. Free Software Foundation, Inc. Retrieved 1 January 2013.
- "The Customer Is Always Wrong". Retrieved 2011-02-06.
- "Australia Recording industry Association Survey, 2003". Retrieved 2011-02-05.
- "Microsoft executive: Pirating software? Choose Microsoft!". Retrieved 2011-02-06.
- Conner, Kathleen and Richard Rummelt (1991). "Software Piracy: An Analysis of Protection Strategies". Management Science 37 (2).
- Oestreicher-Singer, Gal and Arun Sundararajan (2004). "Are Digital Rights Valuable? Theory and Evidence from the eBook Industry". Proceedings of the International Conference on Information Systems.
- Dinah A. Vernik; Devavrat Purohit; Preyas S. Desai (2011). "Music Downloads and the Flip Side of Digital Rights Management". Retrieved 12 July 2012.
- Sinclair, Brendan. "Ubisoft DRM games to be temporarily unplayable".
- Dobra, Andrei. "DRM Doesn't Stop Piracy, Game Content Does, Good Old Games Believes". Retrieved 12 July 2012.
- Committee on Intellectual Property Rights in the Emerging Information Infrastructure, National Research Council. (2000) "The Digital Dilemma: Intellectual Property in the Information Age." 3 May 2011. http://www.nap.edu/catalog.php?record_id=9601#toc
- "Surprise, surprise -- almost every piracy website features cyber scams". BetaNews. Retrieved 8 October 2014.
- "Louis CK: Live at the Beacon Theater". Buy.louisck.net. 13 December 2011. Retrieved 2012-01-07.
- Ingram, Mathew (2011-12-14). "What Louis C.K. Knows That Most Media Companies Don't". Businessweek. Retrieved 2012-01-07.
- chris hannay (6 September 2012). "Why Louis C.K.'s big payday proves the Internet has ethics". The Globe and Mail. Retrieved 2012-01-07.
- "A New DRM-free Experiment: Diesel Sweeties". news.cnet.com. 17 January 2012. Retrieved 2012-02-17.
- "Diesel Sweeties Webcomics Ebook". www.dieselsweeties.com. Retrieved 2012-02-17.
- "Free PDF of the first Diesel Sweeties comic collection". boingboing.net. Retrieved 2012-02-17.
- "Diesel Sweeties eBook-Stravaganza 3000 by Richard Stevens — Kickstarter". Kickstarter.com. Retrieved 2012-02-20.
- "An Experiment in iBookery". dieselsweeties.com. 23 January 2012. Retrieved 2012-02-17.
- "iBooks Follow-up". dieselsweeties.com. 26 January 2012. Retrieved 2012-02-17.
- "Diesel Sweeties eBook-Stravaganza 3000". Retrieved 2012-02-17.
- "Double Fine Adventure". Retrieved 2012-02-17.
- "Double Fine's adventure game will be DRM free for backers". videogamer.com. 16 February 2012. Retrieved 2012-02-17.
- drmfree-torment-is-the-most-richly-backed-game-on-kickstarter on theinquirer.net
- civitas-the-drm-free-alternative-to-simcity-hits-kickstarter on techspot.com
- Kitaru Kickstarter supporters get DRM-free copy of the game on technologytell.com
- Monaghan, Angela. (2007). "Radiohead Challenges Labels With Free Album." Web. 10 May 2011. http://www.telegraph.co.uk/finance/markets/2816893/Radiohead-challenges-labels-with-free-album.html
- Baker, Dean. (2003). "The Artistic Freedom Voucher: An Internet Age Alternative to Copyrights." Pg. 2–8. Web. 3 May. 2011. http://www.cepr.net/documents/publications/ip_2003_11.pdf
- Patent application 58-186100 (Publication #60-077218), Software Control System, Japan Patent Office, October 5, 1983, Ryoichi Mori, applicant. Reported by Industrial Property Digital Library.
- Lawrence Lessig's Free Culture, published by Basic Books in 2004, is available for free download in PDF format. The book is a legal and social history of copyright. Lessig is well known, in part, for arguing recent landmark cases on copyright law. A Professor of Law at Stanford University, Lessig writes for an educated lay audience, including for non-lawyers. He is, for the most part, an opponent of DRM technologies.
- Rosenblatt, B. et al., Digital Rights Management: Business and Technology, published by M&T Books (John Wiley & Sons) in 2001. An overview of DRM technology, business implications for content publishers, and relationship to U.S. copyright law.
- Consumer's Guide to DRM, published in 10 languages (Czech, German, Greek, English, Spanish, French, Hungarian, Italian, Polish, Swedish), produced by the INDICARE research and dialogue project
- Eberhard Becker, Willms Buhse, Dirk Günnewig, Niels Rump: Digital Rights Management - Technological, Economic, Legal and Political Aspects. An 800 page compendium from 60 different authors on DRM.
- Arun Sundararajan's Managing Digital Piracy: Pricing and Protection uses the following digital rights conjecture, that "digital rights increases the incidence of digital piracy, and that managing digital rights therefore involves restricting the rights of usage that contribute to customer value" to show that creative pricing can be an effective substitute for excessively stringent DRM.
- Fetscherin, M., Implications of Digital Rights Management on the Demand for Digital Content, provides an excellent view on DRM from a consumers perspective. "Buch- und online Publikationen". dissertation.de. 1998-02-05. Retrieved 2010-08-31.
- The Pig and the Box, a book with colorful illustrations and having a coloring book version, by 'MCM'. It describes DRM in terms suited to kids, written in reaction to a Canadian entertainment industry copyright education initiative, aimed at children.
- Present State and Emerging Scenarios of Digital Rights Management Systems - A paper by Marc Fetscherin which provides an overview of the various components of DRM, pro and cons and future outlook of how, where, when such systems might be used.
- DRM is Like Paying for Ice - Richard Menta article on MP3 Newswire discusses how DRM is implemented in ways to control consumers, but is undermining perceived product value in the process.
- A Semantic Web Approach to Digital Rights Management - PhD Thesis by Roberto García that tries to address DRM issues using Semantic Web technologies and methodologies.
- Patricia Akester, "Technological Accommodation of Conflicts between Freedom of Expression and DRM: The First Empirical Assessment" available at http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1469412 (unveiling, through empirical lines of enquiry, (1) whether certain acts which are permitted by law are being adversely affected by the use of DRM and (2) whether technology can accommodate conflicts between freedom of expression and DRM).
- BBC News Technology Q&A: What is DRM?
- Copyright vs Community in the Age of Computer Networks by Richard Stallman
- Windows Media DRM FAQ at the Wayback Machine (archived December 8, 2010) from Microsoft
- Microsoft Research DRM talk, by Cory Doctorow
- iTunes, DRM and competition law by Reckon LLP
- Digital Rights Management at the Wayback Machine (archived March 8, 2008) from CEN/ISSS (European Committee for Standardization / Information Society Standardization System). Contains a range of possible definitions for DRM from various stakeholders. 30 September 2003
- PC Game Piracy Examined Article investigating the effects of DRM and piracy on the video game industry
- DRM.info Information about DRM by Chaos Computer Club, Defective by design, Electronic Frontier Foundation, Free Software Foundation Europe, and other organisations.
- DRM Is Failure, by Adam Singer at Future Buzz media marketing