A version of the GPL for reference material.

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).

License for the Open Content Project

Copyleft license applied to artistic content and projects.

A share-alike licence for data and databases from Open Data Commons. Includes licence text, implementation instructions, and an FAQ.

License of the Open Gaming Foundation, as drafted by Wizards of the Coast.

"One particular licensing option...is a growing problem for the free content community. It is the allow non-commercial use only (-NC) option. The 'non-commercial use only' variants of the Creative Commons licenses are non-free, and in some ways worse ...

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 ...