The authority for designating licenses that comply with the essential freedoms required by FOSS is the Open Source Initiative.
Some common FOSS licenses include:
A comparison of some FOSS licenses across some common criteria is shown in the table below. Note all FOSS licenses satisfy the first four conditions.
|Source must be free||Must retain copyright notice||Modifications covered under license||Can sell executable without restriction||Cannot use for software or data locking||Code that reuses covered under license||Code that is combined covered under license||Linked code covered under license||New updates to license will apply||Patent retal-iation, loss of use if suit brought||Can sell source code|
|GPL V3||Y||Y||Y||Y||Y||Y||Y if shared data structures, N if separate programs||-||Y||-||-|
Y = Yes, "-" = No