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Creative Commons
Creative Commons is a nonprofit organization that offers flexible copyright licenses for creative works.
http://creativecommons.org/
GNU General Public License
Everyone is permitted to copy and distribute verbatim copies.
http://www.gnu.org/licenses/gpl.html
GNU Lesser General Public License
This license, the Lesser General Public License, applies to some specially designated software packages--typically libraries--of the Free Software Foundation and other authors who decide to use it.
http://www.gnu.org/licenses/lgpl.html
Science Commons
Our goal is to promote innovation in science by lowering the legal and technical costs of the sharing and reuse of scientific work.
http://sciencecommons.org/