Beerware Comparison of free and open-source software licenses Free-software license Jacobsen v. Katzer – a ruling which states that legal copyrights can have $0 value and thereby supports all licenses, both commercial and open-source List of free-content licenses Multi-licensing Open-source model Open-source software Proprietary software Software license List of free and open-source software licenses List of copyleft software licenses List of permissive software licenses