Free Software Foundation provides short summaries of the key open source licenses, including whether the license qualifies as a free software license or a copyleft license. Also includes a discussion of what constitutes a free software license or a copyleft license (e.g., a Copyleft license is a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well.)
Załožba Free Software Foundation staja krótke zjeća najwažnišich licencow wotewrjeneho žórła k dispoziciji, mjez nimi, hač licenca jako licenca za swobodnu softwaru abo licenca „copyleft“ płaći. Wobsahuje tež diskusiju wo tym, štož je licenca za swobodnu softwaru abo licenca copyleft (na př. Licenca copyleft rěka, zo je program abo druhe dźěło swobodny, a tež wšě změnjene a rozšěrjene wersije programa dyrbja swobodne być).