The car models (in edited form) are part of FRM TOURING CARS & FRM SUPER TOURING
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I gave permission for a conversion, but I think the permission was handed over one or two times, and the models ended up being part of something a little bit different that I had thought.
It was the same thing with the rfactor1 and the rfactor2 versions.
As a modder myself I understand the desire to build upon and develop things, but it is also some mixed feelings when loosing control of my own work that I have spent so much time making.
I always wanted the conversions to be as close as possible to what I had made, because that was the "composition". It was almost like sending your child to a photographer and then receive a photoshopped picture resembling a mix of the child and someone else
That may be a reason to make a limited conversion to GTR2 myself, but on the other hand, the more versions that are out, the more "illegal" half made or bad conversions to other games without any permission at all (Assetto Corsa, Automobilista1).