Files in the Net::MAC Perl module are licensed under the GNU General 
Public License Version 3, which you can find in the file "GPL.txt" 
included with the Net::MAC distribution.  

Net::MAC - Perl extension for representing and manipulating MAC addresses
Copyright (C) 2005-2007 Karl Ward <karlward@cpan.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.