Additional Links

http://www.fsf.org/
The Free Software Foundation, the organization to manage the idea and the outcome of the GNU project
http://www.gnu.org/
The GNU project itself
http://www.opensource.org/
Homepage of the Open Source Initiative which maintains the Open Source Definition and the list of OSI approved licenses
http://www.opensource.org/docs/osd
The Open Source Definition which determines the scope of the OSLiC conceptually
http://www.opensource.org/licenses/
The OSI list of approved licenses which determine the scope of the OSLiC by items
http://www.opensource.org/lists
The OSI mailing lists by which the licenses are reviewed (discussed) and some specific issues of the scope of a license are discussed
http://www.ifross.org/
German written site being maintained by famous experts in open source licenses which offers very deep insights into legal aspects of using open source software compliantly.