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Share-alike
Share-alike
is a copyright licensing term, originally used by the Creative Commons
Creative Commons
project, to describe works or licences that require copies or adaptations of the work to be released under the same or similar licence as the original.[1] Copyleft
Copyleft
licences are free content or free software licences with a share-alike condition. Two currently-supported Creative Commons
Creative Commons
licences have the ShareAlike condition: Creative Commons
Creative Commons
Attribution-ShareAlike (a copyleft, free content licence) and Creative Commons Attribution-NonCommercial-ShareAlike (a proprietary licence). The term has also been used outside copyright law to refer to a similar plan for patent licensing.[2]

Contents

1 Copyleft 2 Creative Commons 3 Version history 4 Adoption 5 See also 6 References

Copyleft[edit] Main article: Copyleft Copyleft
Copyleft
or libre share-alike licences are the largest subcategory of share-alike licences. They include both free content licences like Creative Commons
Creative Commons
Attribution-ShareAlike and free software licences like the GNU General Public License. These licences have been described pejoratively as viral licences, because the inclusion of copyleft material in a larger work typically requires the entire work to be made copyleft. The term reciprocal license has also been used to describe copyleft, but has also been used for non-libre licenses (see, for example, the Microsoft Limited Reciprocal License). Free content
Free content
and software licences without the share-alike requirement are described as permissive licences. Creative Commons[edit] As with all six licences in the current Creative Commons
Creative Commons
suite, CC Attribution-ShareAlike and CC Attribution-NonCommercial-ShareAlike require attribution. According to Creative Commons, the advantage of this license is that future users are not able to add new restrictions to a derivative of your work; their derivatives must be licensed the same way.[3] The 3.0 and 4.0 version of the ShareAlike licenses include a compatibility clause, allowing Creative Commons
Creative Commons
to declare other licenses as compatible and therefore derivatives may use these instead of the license of the original work. Version history[edit] Over the years, Creative Commons
Creative Commons
has issued 5 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, 3.0 and 4.0).

Attribution-ShareAlike Version 1.0 Generic[4] and Attribution-NonCommercial-ShareAlike Version 1.0 Generic[5] – Released December, 2002 Attribution-ShareAlike Version 2.0 Generic[6] and Attribution-NonCommercial-ShareAlike Version 2.0 Generic[7] – Released May, 2004 Attribution-ShareAlike Version 2.5 Generic[8] and Attribution-NonCommercial-ShareAlike Version 2.5 Generic[9] – Released June, 2005 Attribution-ShareAlike Version 3.0 Unported[10] and Attribution-NonCommercial-ShareAlike Version 3.0 Unported[11] – Released March, 2007 Attribution-ShareAlike Version 4.0 International[12] and Attribution-NonCommercial-ShareAlike Version 4.0 International[13] – Released November, 2013

Adoption[edit] In June 2009 the community and Wikimedia Foundation
Wikimedia Foundation
board approved the adoption of the Creative Commons
Creative Commons
Attribution-ShareAlike (CC BY-SA) license as the main content license for and other Wikimedia sites. Creative Commons
Creative Commons
hailed this decision as a victory for free culture as well as visionary leadership.[14] See also[edit]

Wikipedia's CC Attribution-ShareAlike license

References[edit]

^ "Glossary". Retrieved 2012-03-05.  ^ "Share-Alike Patents". Retrieved 2012-03-05.  ^ "Share Alike". Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-ShareAlike 4.0 International — CC BY-SA 4.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ " Creative Commons
Creative Commons
— Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0". Creativecommons.org. 1999-02-22. Retrieved 2017-08-13.  ^ "+ CC BY-SA = Free Culture Win!". 2009-06-22. Retrieved 2017-08-13. 

v t e

Intellectual property
Intellectual property
activism

Issues

Copyright
Copyright
infringement Digital rights management Gripe site Legal aspects of file sharing Mashup

digital music videos

Monopolies of knowledge Music piracy Orphan works Patents

biological software software patent debate trolling

Public domain

Concepts

All rights reversed Alternative compensation system Anti-copyright notice Business models for open-source software Copyleft Commercial use of copyleft works Commons-based peer production Free content Free software
Free software
license Libertarian positions Open content Open design Open Music Model Open patent Open-source hardware Open-source software Prize system

contests

Share-alike Video on demand

Movements

Access to Knowledge movement Anti-copyright Cultural environmentalism Free culture movement Free software
Free software
movement

Organizations

Copyright
Copyright
Alliance Creative Commons

Electronic Frontier Foundation Free Software Foundation Open Rights Group Organization for Transformative Works The Pirate Bay Piratbyrån Pirate Party Sci-Hub Students for Free Culture

People

Alexandra Elbakyan Rick Falkvinge Lawrence Lessig Richard Stallman Peter Sunde Peter Suber Aaron Swartz

Documentaries

Steal This Film
Steal This Film
(2006, 2007) Good Copy Bad Copy
Good Copy Bad Copy
(2007) RiP!: A Remix Manifesto (2008) TPB AFK: The Pirate Bay
The Pirate Bay
Away From Keyboard (2013) The Interne

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