Just checked out a site that is at Crafts and Copyrights FAQs. MANY things are copyright protected. Not sure I wanted to see that site. They didn't say specifically about quilts (that I could find) , but they did address "crafts". On "Quilts For Sale" they had this site as the one to follow for submitting your quilts for sale.

It is very narrow on what you can use freely. : (