The Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License (CC BY-NC-SA 3.0) is a license that allows you to share and adapt a work for noncommercial purposes, as long as you give appropriate credit, provide a link to the license, and indicate if changes were made. You can also distribute the work under the same license as the original. This license does not allow commercial use of the work.
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. 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.
Copyleft or libre share-alike licenses are the largest subcategory of share-alike licenses. They include both free content licenses like Creative Commons Attribution-ShareAlike and free software licenses like the GNU General Public License. These licenses have been described pejoratively as viral licenses, 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 licenses without the share-alike requirement are described as permissive licenses.
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.
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.
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 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
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 as well as visionary leadership.
- All rights reversed
- Alternative compensation system
- Anti-copyright notice
- Business models for open-source software
- Commercial use of copyleft works
- Commons-based peer production
- Electronic sell-through
- Free content
- Free-software license
- Libertarian positions
- Open content
- Open-design movement
- Open music model
- Open patent
- Open source
- Prizes instead of patents
- Video on demand
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