I guess I am confused...I have seen a lot of discussion on this topic, and I wonder if there is just too much misunderstanding...so please educate me. ...
Crafters, quilters, woodworkers, home designers, etc have all sold products made from other people's patterns - not once I have I seen credit given to anyone. I always understood that a pattern that is published and sold is then to be public and the crafter can use it as they wish. If a designer makes a product, and someone copies it without permission, then there is a problem. So, for example if I made 30 twisted bargello quilts and sold them at a fair, there should be no problem since I came by the pattern legitimately when I bought the book - I am not taking any special credit for the design, just the workmanship...but if I go to the quilt show, take a picture of a quilt and then make one to show myself - that is an infringement...
Is it getting more complicated than that?