While reading this thread, an idea popped into my head. I don't know how easy this might be to implement, but perhaps this might be a partial solution to the problem ... and I offer it as food for thought ... The ideal time to catch potential copyright violations is before the product goes up for sale. So, perhaps what might help is to create a forum in which the store staff posts the promotional pictures that are submitted with a product, and then the marketplace vendors can see the promo renders before the item goes into the store. The previews will not be viewable to the general public, but in a new forum that only the merchants have access to. While the product is being tested for release, the remaining vendors will have a chance to view the promo images beforehand (as in most cases the similarities can show up there). Then if there is any concern about potential copyright violation the release of the product can be held until it is checked out.