I to have seen copies of materials ( or slightly changed materials ) sold or distributed under a new authors name or logo.

There are 2 or 3 versions of Clay's fire, that have been in free stuff ( here and there ).

 

I think for the most part it's a matter of a person ethics and morals, when it comes to something like Bryce materials.

It would be hard to prove that someone plagiarized another's material. But it's usually easy to see when someone copies

another's creation.

 

I have used others peoples materials as a guides to create new materials. But I do not take their material into the DTE and change it. I start from the ground up, I have a base material called default nothing. Which is just that, a material with all properties set to 0 or none.

Stephen Ray