Share-alike
Share-alike (🄎) is a copyright licensing term, originally used by the Creative Commons project, to describe works or licenses that require copies or adaptations of the work to be released under the same or similar license as the original.[1] Copyleft licenses are free content or free software licenses with a share-alike condition.
Two currently-supported Creative Commons licenses have the ShareAlike condition: Creative Commons Attribution-ShareAlike (a copyleft, free content license) and Creative Commons Attribution-NonCommercial-ShareAlike (a proprietary license).
The term has also been used outside copyright law to refer to a similar plan for patent licensing.[2]
Copyleft
Copyleft or
Free content and software licenses without the share-alike requirement are described as permissive licenses.
Creative Commons
As with all six licenses 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.[3]
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
This section needs expansion with: cc-sa-1.0. You can help by adding to it. (November 2022) |
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[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
See also
- Wikipedia's CC Attribution-ShareAlike license
References
- ^ "Glossary". Archived from the original on 2012-02-22. Retrieved 2012-03-05.
{{cite web}}
: CS1 maint: unfit URL (link) - ^ Davis, Ian (2011-08-08). "Share-Alike Patents". Archived from the original on 2012-04-03. Retrieved 2012-03-05.
- ^ "Share Alike". CC Wiki. 2011-01-24. Archived from the original on 2017-08-13. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-25. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-25. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-22. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-13. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-23. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-12. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-22. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0". Creativecommons.org. 1999-02-22. Archived from the original on 2018-02-15. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0". Creativecommons.org. 1999-02-22. Archived from the original on 2016-12-21. Retrieved 2017-08-13.
- ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-13. Retrieved 2017-08-13.