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Creative Commons License Generator
Service allowing quick and easy selection of one of a range of Open Content licenses to meet a content creators' requirements (concerning attribution, whether commercial use is allowed, and whether modification is allowed).
Free Art License
Copyleft license applied to artistic content and projects.
GNU Free Documentation License
A version of the GPL for reference material.
October Open Game License
OOGL. The purpose of this License is to make a rulebook, game manual, sourcebook, supplement, or other written role-playing game document "free" in the sense that everyone is permitted to copy and redistribute it, with or without modifying it, either commercially or noncommercially.
Open Content License
License for the Open Content Project
Open Directory Project License
The license agreement for replicating ODP data.
Open Game License
License of the Open Gaming Foundation, as drafted by Wizards of the Coast.
The Open Book Project
Open Content Licence for IDG's Open Book Project.