You ran into a bit of a sore spot in the community without knowing it 76claudia2205, this subject comes up every once in a while. There were at one point a few merchnats who made it part of their EULA that they be credited whenever their product was used, and there was a lot of backlash against that. I think most of the members look at it from the point of not feeling like they have to promote a merchant when they buy their stuff, more than that they dont want to help another user find what they used in a scene. that factored in with the shear difficulty of actually keeping track of where all the content you used in a scene came from, when you are working out of several runtimes with thousands of items in them, discourages the practice of crediting content.