I've posted before about the problems with "same terms as Perl" licensing, not the least of which is the question "which version of Perl are you referring to?" I bet that most people who use "same terms as Perl itself" used it for the same reason I did: because it was the easiest way to do it, and I was lazy.
So to help out my lazy sisters and brothers in Perl, here is a block of POD that you can go paste into your modules right now, all formatted and pretty.
=head1 COPYRIGHT & LICENSE Copyright 2005-2009 Andy Lester. This program is free software; you can redistribute it and/or modify it under the terms of either: =over 4 =item * the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or =item * the Artistic License version 2.0. =back
You'll want to change the "Andy Lester" part. I don't want to take credit for half the CPAN.