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Share-alike is a
copyright licensing
copyright licensing
term, originally used by the
Creative Commons Creative Commons (CC) is an American non-profit organization A nonprofit organization (NPO), also known as a non-business entity, not-for-profit organization, or nonprofit institution, is a legal entity organized and operated for a collect ...

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 Copyleft is the practice of granting the right to freely distribute and modify with the requirement that the same rights be preserved in derivative works created from that property. Copyleft in the form of s can be used to maintain conditions ...

Copyleft
licences are
free content Free content, libre content, or free information is any kind of functional work, work of art A work of art, artwork, art piece, piece of art or art object is an artistic creation of aesthetics, aesthetic value. Except for " ...
or
free software Free software (or libre software) is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty ...
licences with a share-alike condition. Two currently-supported Creative Commons licences have the ShareAlike condition: Creative Commons Attribution-ShareAlike (a
copyleft Copyleft is the practice of granting the right to freely distribute and modify with the requirement that the same rights be preserved in derivative works created from that property. Copyleft in the form of s can be used to maintain conditions ...

copyleft
,
free content Free content, libre content, or free information is any kind of functional work, work of art A work of art, artwork, art piece, piece of art or art object is an artistic creation of aesthetics, aesthetic value. Except for " ...
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 A license (American English) or licence (British English) is an official permission or permit to do, use, or own something (as well as the document of that permission or permit). A license is granted by a party to another party as an element of ...

patent licensing
.


Copyleft

Copyleft or
libre Libre may refer to: Computing * Libre software, free software * Libre Computer Project, developer of open-hardware single-board computers Music * Libre (Alejandra Guzmán album), ''Libre'' (Alejandra Guzmán album) * Libre (Jennifer Peña album), ...
share-alike licences are the largest subcategory of share-alike licences. They include both
free content Free content, libre content, or free information is any kind of functional work, work of art A work of art, artwork, art piece, piece of art or art object is an artistic creation of aesthetics, aesthetic value. Except for " ...
licences like Creative Commons Attribution-ShareAlike and
free software Free software (or libre software) is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty ...
licences like the
GNU General Public License The GNU General Public License (GNU GPL or simply GPL) is a series of widely used free software license A free-software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that ...
. 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 software licence, 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 (copyright), 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 License compatibility, 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 Wikipedia 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 movement, free culture as well as visionary leadership.


See also

*Wikipedia:Text of Creative Commons Attribution-ShareAlike 3.0 Unported License, Wikipedia's CC Attribution-ShareAlike license


References

{{intellectual property activism Public copyright licenses Copyleft Free software Creative Commons vi:Giấy phép Creative Commons#Chia sẻ tương tự