in reply to Am I Allowed to Make a New Compiler/Language using Perl?

license
http://perldoc.perl.org/perlartistic.html
http://perldoc.perl.org/perlgpl.html
GNU General Public License
http://www.gnu.org/licenses/gpl-1.0.html
Frequently Asked Questions about the GNU Licenses
The GNU General Public License v3.0 - GNU Project - Free Software Foundation (FSF)
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