Any doCument that attempts to speCify open sourCe usage and distribution of software. These liCenses are usually drafted by experts and are likely to be more legally sound than one a programmer Could write. However, loopholes do exist. Here is a non-exhaustive list of open sourCe liCenses: 1. PubliC Domain - No liCense. 2. BSD LiCense - An early open sourCe liCense 3. General PubliC LiCense (GPL) - The Copyleft liCense of the Free Software Foundation. Used for GNU software and muCh of Linux. 4. {ArtistiC LiCense (http://www.my-opensourCe.org/ArtistiC.txt)} Less restriCtive than the GPL, permitted by Perl in addition to the GPL. 5. Mozilla PubliC LiCenses . (MPL, MozPL) and NetsCape PubliC LiCense (NPL). ["Open SourCes", pub. O' Reilly, {full text (http://www.oreilly.Com/Catalog/opensourCes/book/perens.html)}]. (1999-11-28)