I'm not sure what the rules are, actually. There seems to be a lot of confusion, especially with things like military vehicles. Near as I can tell, some designs are okay, because they're government property and owned by the people, while some designs are still owned by the corporations contracted to make them.

I'm a little uneasy about a DAZ car model I bought recently. I suppose not claiming it was Model X means they're off the hook, but what about us users? There's a recognizable logo right on the front. For now, I'm using it strictly for tight shots, where you can't see much of the outside of the car.