In case anyone cares this is not the policy of any other vendor or of the store that I know of. As far as HandspanStudios is concerned you do not have to mention our name anywhere in your renders, nor do I keep track of a list of buyers etc. If I give away or sell an item it is with the understanding that you do not owe me any credits, anything of that sort is a courtesy we appreciate but would never demand. My readme says that my items are ok for private or commercial use as long as you don't give away or sell the model/texture. I think that is the norm with store items, free stuff sometimes has additional restrictions. If a vendor wanted to place extreme restrictions on an item it would be necessary to make the buyer aware on the sales page or the readme at the very least.

"Your work is to keep cranking the flywheel that turns the gears that spin the belt in the engine of belief that keeps you and your desk in midair."

Annie Dillard