A more complete list of open content licenses can be found at http://www.opencontentlist.com Some interesting pages on the subject include:
- http://jan.netcomp.monash.edu.au/opendoc/paper.html
- http://www.gnu.org/licenses/fdl.html (FreeDocumentationLicense)
- http://www.dsl.org/copyleft/
- http://creativecommons.org/licenses/ (CreativeCommons licenses)
- http://www.linuxworld.com/linuxworld/idgbooks-openbook/lw-oclicense.html
- http://www.opencontent.org/opl.shtml (OpenContentLicense, note the singular)
- http://artlibre.org/licence.php/lalgb.html
- http://www.publiclibraryofscience.org/ploslicense.htm