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SHARE-ALIKE is a copyright licensing term, originally used by the 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. Copyleft licences are free content or free software licences with a share-alike condition.

Two currently-supported Creative Commons licences have the ShareAlike condition: 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 .

CONTENTS

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

COPYLEFT

Main article: Copyleft

COPYLEFT or libre share-alike licences are the largest subcategory of share-alike licences. They include both free content licences like 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 and software licences without the share-alike requirement are described as permissive licences .

CREATIVE COMMONS

As with all six licences in the current 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.

The 3.0 and 4.0 version of the ShareAlike licenses include a compatibility clause, allowing Creative Commons to declare other licenses as compatible and therefore derivatives may use these instead of the license of the original work.

VERSION HISTORY

Over the years, 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 and Attribution-NonCommercial-ShareAlike Version 1.0 Generic – Released December, 2002 * Attribution-ShareAlike Version 2.0 Generic and Attribution-NonCommercial-ShareAlike Version 2.0 Generic – Released May, 2004 * Attribution-ShareAlike Version 2.5 Generic and Attribution-NonCommercial-ShareAlike Version 2.5 Generic – Released June, 2005 * Attribution-ShareAlike Version 3.0 Unported and Attribution-NonCommercial-ShareAlike Version 3.0 Unported – Released March, 2007 * Attribution-ShareAlike Version 4.0 International and Attribution-NonCommercial-ShareAlike Version 4.0 International – Released November, 2013

ADOPTION

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

SEE ALSO

*\'s CC Attribution-ShareAlike license

REFERENCES

* ^ "Glossary". Retrieved 2012-03-05. * ^ "Share-Alike Patents". Retrieved 2012-03-05. * ^ "Share Alike". Retrieved 2010-12-17. * ^ " Creative Commons — Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0". Creativecommons.org. 1999-02-22. Retrieved 2013-10-06. * ^ " Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0". Creativecommons.org. 1999-02-22. Retrieved 2014-05-15. * ^ " Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0". Creativecommons.org. 1999-02-22. Retrieved 2014-05-15. * ^ " Wikipedia + CC BY-SA = Free Culture Win!".

* v * t * e

Intellectual property activism

ISSUES

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

* Mashup

* digital * videos * music

* 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 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 movement

ORGANIZATIONS

* 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_ (2006, 2007) * _Good Copy Bad Copy_ (2007) * _RiP!: A Remix Manifesto_ (2008) * _TPB AFK: The Pirate Bay Away From Keyboard_ (2013) * _The Internet\'s Own Boy_ (2014)

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