by shashank » Tue Jun 05, 2012 1:48 am
It's copyright infringement (and possibly trademark infringement). It's a myth that if you change a certain percent of an image, it is not a violation of copyright. You are still using the image without permission, and the Seuss family is very tight on licensing his work.
Chances are you wouldn't get caught, BUT it is a copyright violation. And if you sell those shirts, it is definitely a violation because even though you changed things, you are still using someone else's work to make money.