A very nice, legally-protected arena for sharing creative works and data, created by a Harvard lawyer, Lawrence Lessig.  It is distinct from software licenses in that it is intended for creative content, not really code.  

''Personally, I see the CreativeCommons group of licenses for the content made by users within domains made possible by FreeSoftware and the GNU Project.''

See http://creativecommons.org/

Also see OpenContent, OpenArchivesInitiative, PublicLibraryOfScience, and BudapestOpenAccessInitiative, GnuGeneralPublicLicense.
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CategoryOpenSource