I agree with Rids. You should be under no obligation to credit the supplier of paid content. Should advertisers credit the artist when they use images they purchased from stock agencies? How ridiculous. I think the real objection here is to people who use Carrara to render purchased content. I know some people get their panties in a twist over non-modelers using the software in an "impure" manner, but for the life of me, I can't figure out why they care. Are they afraid that these people want to get credit for models they didn't create? Is 3d art only legitimate if only one person has produced everything, from model to textures to lighting to composition, etc.... In truth I think such a person who can do it all well is rare indeed, and as such they should be admired. But don't completely discount those who haven't been blessed with such skill. Modelers are not the only artists involved in 3d productions, and there are real, valuable skills involved in lighting, framing, and animation that are irrelevent to who created the model. If you look at Carrara, you may notice that there are a lot of tabs other than the modeling workspace, and that modeling is not the only legitimate or expected use of the software. Making any assumptions about the content in a 3d image or animation is foolish on the part of the viewer, imo. If you prefer to create 100 percent of your content and use zero post-processing then go ahead and do it, and brag it up if you're good at it. I just don't see the need to then go sneering at people who don't have modeling abilities, but still enjoy other aspects of creating 3d imagery.