It doesn't make any sense to me either, but I don't think I can be misunderstanding or misinterpreting them. Here are the exact sentences added to the license: "1.The Buyer that purchase this product have to give credit to the Artist when he posts images on the Renderosity Gallery. 2.The Buyer that purchase this product have to use the same name he/she have used to purchase the Product when he/she uploads images that contain the product to the Renderosity Galleries."