Source : Free On-Line Dictionary of Computing

Open source license
     
         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 (http://www.mozilla.org/MPL/)}.
        (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)