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Perl is dual licensed under both the Artistic License 1.0[1][2] and the GNU General Public License.[3] Distributions are available for most operating systems. It is particularly prevalent on Unix and Unix-like systems, but it has been ported to most modern (and many obsolete) platforms. With only six[citation needed] reported exceptions, Perl can be compiled from source code on all POSIX-compliant, or otherwise-Unix-compatible, platforms.[4]