You mean bought the rights to the actual design, not an instance of that design, right? If so, I agree.
That does raise an interesting point, though. My body shop can recreate elements of my car's design in order to repair it.
Unlike patents, trademarks never die. I think the standard the courts use in such cases is whether the copy would ‘create confusion in the mind of the consumer’.
Given that this is FR, I’m pretty sure someone who actually knows will be along to correct me soon. ;^)