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 GNUSoftware 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)