A Macabre Fixation: Is Plastination Copyrightable?

I’ve actually wondered about this, as von Hagen’s popular (and assumed lucrative) Body Worlds exhibits have spawned many imitators of possibly questionable origins (one competing show is currently on view in a gallery inside our football stadium at the University of Texas). I guess that beyond the ethical and moral issues of consent and propriety, there’s also the business aspect: how enforceable is copyright when the primary medium is the deceased human body?