Portal:Free and open-source software/Topics

Impediments and challenges
Digital Millennium Copyright Act · Digital rights management · Tivoization · Software patents and free software · Trusted Computing · Proprietary software · SCO-Linux controversies · Binary blobs
Adoption issues
OpenDocument format · Vendor lock-in · GLX · Free standards · Free software adoption cases
About licences
Free software licences · Copyleft · List of FSF-approved software licenses
Common licences
GNU General Public License · GNU Lesser General Public License · GNU Affero General Public License · IBM Public License · Mozilla Public License · Permissive free software licences
History
...of free software · Free software movement · Timeline of free and open-source software
Groupings of software
Comparison of free software for audio · List of open-source video games
Naming issues
GNU/Linux naming controversy · Alternative terms for free software · Naming conflict between Debian and Mozilla