[diffeomorphism]

Really?

Your customers bought that product under license A. Afterwards it turned out that you pirated some artwork from disney. Then your customer can sue you (not disney) to make things right. The specific license of the original work seems quite irrelevant here.

[pessimizer]

Not at all. The reason your customer can sue you is because Disney can sue your customer. Disney would be suing your customer under the specific license of the original work.

edit: you seem to see the customer as the primary victim here instead of Disney, but if Disney weren't a victim the customer wouldn't have a case.