If there is no copyright or patent infringement then there is nothing they could do. But you seem to be applying the laws backward. People can make knock-offs anytime they want. Apple has no jurisdiction to stop that. They can't send people out to burn down factories of competitors. Apple would have to sue to stop it, and then they would have to have a copyright or patent to back up the suit.
I know that, if they set fire to your factory/house/wife and generally try to bully you out of the market then it becomes anti-trust right?
All i said is that it will be interesting when/if someone does offer a mac compatiable 8800 that isn't Apple how Apple will deal with them. How well does Apple normally deal with these kinds of companies as I don't know about you but I don't want to be limited to only one choice (Apple).