http://creativecommons.org/about/cc0
http://www.gnu.org/licenses/license-list.en.html
CC0 is a public domain dedication from Creative Commons. A work released under CC0 is dedicated to the public domain to the fullest extent permitted by law. If that is not possible for any reason, CC0 also provides a lax, permissive license as a fallback. Both public domain works and the lax license provided by CC0 are compatible with the GNU GPL.
If you want to release your work to the public domain, we recommend you use CC0.
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