For crying out Loud!
Once and for all, Perl is distributed under both the GPL AND the Artistic license. The goal, explicitely stated by Larry, of this double licensing is to make everybody happy: suits can use the Artistic License (which he describes as an antidote to the GPL) so they can use it in commercial software, and rabid GNU zealots see their beloved GPL being used.
The goal (once again explicitely stated by Larry) is not to have a legally sound scheme, it is to quiet down both sides of the Open-Source vs Free Software debate, plus commercial software producers. In fact it is designed precisely to avoid that kind of GPL/LGPL nit-picking.
See this interview for Larry's description of this hack, and a legal analysis of the Artistic License in "Essay on the Artistic License