From the CPAN FAQ:

How are Perl and the CPAN modules licensed?

Most, though not all, modules on CPAN are licensed under the GNU Public License (GPL) or the Artistic license and should be stated in the documentation that accompanies the module itself. If the license is not specifically stated in the module, you can always write the author to clarify the issue for you. Also, the text of the Artistic license and the GNU Public License are included in the root directory of the source distribution. From the 'README' file that comes with Perl: ....

So ... like I said, the OP needs to do his homework.