whoever converts a car or a track has no rights over it ... only the original creator of the model does. (and if you want to go down the branding road, well... you know where the story ends)
- physics are, on the other side propriety of the developer of the game engine, no matter how much you tweak it or build a new one for a new 3D model.
Porting models from other games to (in our case) AC is not aloud (be it a track or a car) , but is seems to be tolerated for reasons beyond my comprehension; of course, I am happy that it is that way, so everyone can choose the sim that he likes to drive the cars on the tracks that he likes.
- Not to mention selling mods / conversions ... that is completely out of question.
Out of respect, common sense and courtesy, modders contact the original creator of a mod before changing anything on it, to ask for permission, and permmission is in 99% of the cases guaranteed, with the only request to include the original release notes and fill up a kind of a changelog if any improvements have been done or something has been added or removed. ...simple as that.
(somehow like the recently released 911 rwb... a nice pdf with all the credits, all the changes, all the work done... great job! this is the way it should be done)
Modding is a very nice hobby if you keep it clean, but if you play unfair... well, no joy and no friends down that road.