What's the difference between buying a quilt made with licensed fabric by a local quilter or buying a quilt at a garage sale that originally was bought at company store (ie Disney). Nobody questions garage sale or estate sale finds.
Just because the wording is there doesn't make it enforceable. For instance if you come across an old rental agreement that is good except for a phrase that says something like 'persons of a certain group/nationality need not apply'. An unscrupulous landlord might try to use that to limit who gets to rent. Unenforceable.