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All contributions to [[Wikipedia]] must be licensed by the author under the Creative Commons Attribution Share-Alike (CC BY-SA).<ref>[http://en.wikipedia.org/wiki/Wikipedia:Copyrights Wikipedia:Copyrights] accessed ~~~~~</ref> While it guarantees a number of freedoms to reuse and modify the work, this license also imposes obligations that can make this reuse burdensome. Authors always remain free to copy their own work, but cannot copy work that has been edited by others unless they comply fully with the requirements of the license.

All contributions to [[Wikipedia]] must be licensed by the author under the Creative Commons Attribution Share-Alike (CC BY-SA).<ref>[http://en.wikipedia.org/wiki/Wikipedia:Copyrights Wikipedia:Copyrights] accessed February 10 2012</ref> While it guarantees a number of freedoms to reuse and modify the work, this license also imposes obligations that can make this reuse burdensome. Authors always remain free to copy their own work, but cannot copy work that has been edited by others unless they comply fully with the requirements of the license.

The requirements of the Wikipedia license include:<ref>[http://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License Wikipedia:Text of Creative Commons Attribution-ShareAlike 3.0 Unported License] accessed ~~~~~</ref>

The requirements of the Wikipedia license include:<ref>[http://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License Wikipedia:Text of Creative Commons Attribution-ShareAlike 3.0 Unported License] accessed February 10 2012</ref>

* any derivative work must be licensed under the same conditions

* any derivative work must be licensed under the same conditions

* there must be attribution of principal authors

* there must be attribution of principal authors