Copyright Law. As a guideline, copyright law limits you to contributing only original work that you have created yourself from original elements. This means you can’t use images of celebrities or corporate products, nor images, text, or design that you’ve cut from a website without written permission from the owner. You can’t create a "new" image using elements from images that other people have created. And you can’t contribute a quote or a slogan that is substantially the same as something already written by someone else.

You can't take someones slogan and change the color and text and call it's yours! Please remove your product or take my slogan off your shirt!