There seems to be significant debate too as to whether or to what extent state law, e.g. a contract, would be preempted by federal copyright law and thus could not be used to establish new de facto intellectual property rights,
@TheBaker Of course the Printoom Inc. hasn't registered the images either
@Nick Indeed it would be interesting to know what they actually think the contract is. If the images are public domain then wouldn't a contract only be with the buyer of the print, not with anyone they gave or sold it to?