I am new to the Elder Scrolls modding world! I have heard that this has happened in the past. The site that I posted does not post illegal mods. The mods that I have seen on there have all been used with permission.
If that wasnt the case, I dont believe there would be a Renderosity wish list on their forum..there wouldnt be a need for one.
I have talked to some good modders there and none will use anything without permission from that particular site.