[ Thanks to
Jacob Barkdull for this link. ]
“To be “GPL Compatible” means code to a program
licensed so that it can be combined with a program under the GNU
General Public License (GPL) without conflict (the new combination
would have the GPL applied to the whole). The result is strong
Copyleft licensed Free Software, this design is a reference to
that.“I made this simple design because I wanted this specific shirt,
I think it would be cool to wear. Now that it’s up on CafePress —
if you like the concept — please feel free to order one. I’ve
never used CafePress before, so I don’t quite know if I can adjust
(lower) the prices, but I will if I can.”