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Undid revision 1233602173 by Stephan Leeds (talk) The hyphen is part of the name of the licence (e.g. see the footer of any page on this site) |
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Copyleft [[software license]]s are considered ''protective'' or ''reciprocal'' in contrast with [[Permissive software license|permissive free software licenses]],<ref name="redhat2005">{{cite conference |url=https://www.redhat.com/f/summitfiles/presentation/May31/Open%20Source%20Dynamics/Troan_OpenSourceProprietyPersp.pdf |title=Open Source from a Proprietary Perspective |last1=Troan |first1=Larry |year=2006 |conference=Red Hat Summit |publisher=[[Red Hat]] |archive-url=https://web.archive.org/web/20140122163130/https://www.redhat.com/f/summitfiles/presentation/May31/Open%20Source%20Dynamics/Troan_OpenSourceProprietyPersp.pdf |archive-date=22 January 2014 |url-status=dead |location=Nashville}}</ref> and require that information necessary for reproducing and modifying the work must be made available to recipients of the software program, which are often distributed as [[executable]]s. This information is most commonly in the form of [[source code]] files, which usually contain a copy of the license terms and acknowledge the authors of the code. Copyleft help ensuring everyone's rights to freely use the product but is prohibited from owning, registering copyright and earning royalties from copyright.
Notable copyleft licenses include the [[GNU General Public License]] (GPL), originally written by [[Richard Stallman]], which was the first software copyleft license to see extensive use;<ref>{{Cite web|url=https://www.gnu.org/copyleft/gpl.html |title=GNU General Public License |website=GNU Project |first=Richard |last=Stallman |date=29 June 2007 |access-date=1 May 2017}}</ref>{{Primary source inline|date=March 2024}} the [[Mozilla Public License]]; the [[Free Art License]];<ref>{{Cite web|title=Free Art License 1.3|url=https://artlibre.org/licence/lal/en/|access-date=6 October 2021|website=Copyleft Attitude}}</ref>{{Primary source inline|date=March 2024}} and the [[Creative Commons]] [[share-alike|share-alike license condition]]<ref name="cc-by-sa">{{Cite web|title=Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)|url=https://creativecommons.org/licenses/by-sa/4.0/|access-date=14 August 2015|website=Creative Commons}}</ref>{{Primary source inline|date=March 2024}}—with the last two being intended for non-software works, such as documents and pictures, both academic or artistic in nature. Wikipedia is copyleft under the [[Creative Commons
== History ==
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