Free software
Foundation of the GNU project
Release of the Linux kernel
Naming
Definition and the Four Freedoms
Security and reliability
Binary blobs and other proprietary software
Business model
Economical aspects and adoption
Free software license
Free software licensing
Open source software licensing
Legal impacts of open source and free software licensing
Applications and philosophy
OSI-approved "open source" licenses
FSF-approved "free software" licenses
Conditions in free software licenses
Copyleft
Patent retaliation
Hardware restrictions
Attribution, disclaimers and notices
Practical problems with licenses
License compatibility