Some fabrics specifically say, "for personal use only, not for resale". For those, the issue is clear. If I donate a book to the library, it clearly does not void the rights of publisher or author, only of that specific hard copy. For fabrics, I suspect the issue is cloudier. Obviously, they were printed to be used. The reason we are asked to state where the pattern and fabrics come from is to give credit where it is due. Some of us design our own or simply don't know where it came from, as the stash and pattern collection were a long time building. Secondary use of the quilt image can be, I suspect, a very murky area, legally. It is one I would rather not get involved in.