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 krotke zespominanja nejwažnjejšych licencow wótwórjonego žrědła k dispoziciji, mjazy nimi, lěc licenca płaśi ako licenca za lichu softwaru abo licenca „copyleft“. Wopśimujo teke diskusiju wó tom, což jo licenca za lichu softwaru abo licenca copyleft (na ps. Licenca copyleft groni, až program abo druge źěło jo liche, a teke wšykne změnjone a rozšyrjone wersije programa muse liche byś.)