411 REFERENCE · Wikibooks
Open Education Handbook/Open Licences
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
The definition used in the Open Definition effectively limits open content to libre content; any free content license would qualify as an open content license. According to this narrower criteria, the following still-maintained licenses qualify:
Creative Commons Licenses: only Creative Commons Attribution (CC BY), Attribution-Share Alike (CC BY SA)
Creative Commons Public Domain Tools: CC Zero (not a license but a tool that allows creators to dedicate their works to the public domain)
Open Publication License (the original license of the Open Content Project, the Open Content License, did not permit for-profit copying of the licensed work and therefore does not qualify)
Against DRM license
GNU Free Documentation License
Open Game License (a license designed for role-playing games by Wizards of the Coast)
Free Art License
In addition to Open Definition aligned licenses, more copyright licenses exist. For example, the full suite of Creative Commons licenses are outlined at http://creativecommons.org/licenses. Below are the CC licenses as aligned to a spectrum from Least Open to Most Open. Examples of use for each license are provided at http://creativecommons.org/examples.
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Further resources
Open content licensing for educators
Software Licenses in Plain English
Creative Commons FAQ
Creative Commons Toolkit
Open.Michigan guide to releasing content
P2PU course - Get CC Savvy