Just as a point of order, I'd like to point out that it's not *copyright* that Stang enforces a lot, but the *trademark.*
Important distinction, because acquiescence in enforcing a trademark can make you lose the trademark. And then theoretically someone else could trademark something like it, and [theoretically] sue Stang for using the Dobbshead. Not necessarily a suit they could win, but one that would cost Stang legal fees he likely can't afford.
He's just making sure he doesn't get royally screwed.