Copyright issues and that sort of thing.

[a_slow_old_man]

In general you should ALWAYS assume media you "find" is copyrighted. Unless you can find and ask the original author for permission you should never use somebody else's work

So for example I downloaded... car ref pictures of a mercedes from environment-textures.com (royality free) and I use them for the texture.

Does that mean because environment-textures uses royality free I can use the brand of mercedes or do I have to ask mercedes for the permission?