It's not both licenses, it's either license. Quote the README (emphasis mine):

This program is free software; you can redistribute it and/or modify it under the terms of either:

a) the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or

b) the "Artistic License" which comes with this Kit.

In reply to Re^5: miniperl larger than perl? by revdiablo
in thread miniperl larger than perl? by gaal

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