ISC license

ISC license

ISC license
Author Internet Software Consortium
DFSG compatible Yes
FSF approved Yes
OSI approved Yes
GPL compatible Yes
Copyleft No
Linking from code with a different license Yes

The ISC license is a permissive free software license written by the Internet Software Consortium (ISC). It is functionally equivalent to the simplified BSD and MIT/Expat licenses, with language that was deemed unnecessary by the Berne convention removed.[1] Initially used for ISC's own software releases, it has since become the preferred license of OpenBSD (starting June 2003[2]), among other projects.[3]


  • History 1
  • Text 2
  • See also 3
  • References 4
  • External links 5


Before accepting the license as a free software license, the Free Software Foundation asked for clarification of the text. In July 2007, as a result, "and distribute" was changed to "and/or distribute".[4] The Free Software Foundation eventually approved the ISC license as a lax, permissive free software license, compatible with the GNU GPL.[5] As of March 2015, The OpenBSD template still uses the original "and distribute" phrasing.[3]


A template of this license is:

See also


  1. ^ "OpenBSD license policy". The ISC copyright is functionally equivalent to a two-term BSD copyright with language removed that is made unnecessary by the Berne convention. 
  2. ^ "CVS log for src/share/misc/license.template". Tue Jun 3 17:45:38 2003 UTC by millert: "Add a license template; deraadt@ OK" 
  3. ^ a b "OpenBSD license template". 
  4. ^  
  5. ^ "Various Licenses and Comments about Them - ISC License". Free Software Foundation, Inc. Retrieved 1 October 2014. 

External links

  • Internet Systems Consortium's License Text
  • License template at the Open Source Initiative
  • SPDX License List entry for ISC
  • FSF's view on ISC License