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| copyleft.org | tutorial on copyleft and the GNU general public licence |
| Creative Commons | copyleft licensing for non-software creative work |
| Free Software Foundation | information on GNU software licensing |
| GitHub | how to choose an open source licence |
| GNU.org | ‘What is Copyleft?’ by Richard Stallman |
| GNU.org | GNU software licences |
| GNU.org | GNU manifesto |
| knowledge commons | protecting knowledge as a common resource |
| OSHWA | Open Source Hardware Association |
| P2P Foundation Wiki | copyleft |
| P2P Foundation Wiki | copyfair licences |
| P2P Foundation Wiki | peer production licences |
| Riehl & Rubin | generating every possible melody, to release into the public domain |
| Second Enclosure Movement | paper by James Boyle, criticising the ‘enclosure of the intangible commons of the mind’ |
| Stacco Troncoso | essay: think global, print local and licensing for the commons |
| Stallman.org | Richard Stallman’s website (developer of first copyleft licences) |
| tl;drLegal | copyleft licences list |
| Tragedy of the Anticommons | essay by Michael Heller criticising the enclosure of the commons |
| Wikipedia | copyleft |
| Wikipedia | GNU general public licence |
| Wikipedia | open source hardware |
