That entirely depends on the car. If you buy an exotic supercar like a Bugatti or Koningsegg the manufacturer may very well take it back if they don't like what you're doing to it. You may not like it, but this type of game licensing is the future. All new games from Relic (Company of Heroes, Dawn of War II etc.) have this "must log into their server to play" type of protection/licensing. I'd be surprised if not all the major distributors use similar protection schemes in the near future.
I doubt its going to be a long lived future.
Now Im no hacker by any stretch of the imagination. My only programming experiences were years ago trying to type in stuff that used to come out in "Load*" magazine. and I failed miserably at that. LOL
But
In 25 years of computing I've observed one constant. No matter what anti piracy scheme they come out with. Someone finds a way around it or how to outright defeat it.
And that would include several versions of your favorite and not so favorite operating systems.
Thats just an observation