I know that a designer who sells a pattern CANNOT tell you what you can do with what YOU make from that pattern... EVER! Once they sell that pattern you can do anything you want with it other than copy and sell the pattern itself.
What really burns me is that to enter a quilt in an AQS show, and you made the quilt from a commercial pattern, you have to get permission from the designer. THAT IS NOT THE LAW but I guess they can make any RULES they want.
I rarely use commercial patterns anyway since I enjoy using traditional blocks in different arrangements.