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As per IMVU Creator Agreement: When you mark a product as "derivable" in the catalog, you give permission to every other IMVU Creator to derive a new product from your product. This permission also allows those other IMVU Creators to set their derived products to be derivable. You acknowledge and agree that the original Creator(s) who developed a product as part of the derivation chain are to receive payment of their share of the final catalog price, based on their established wholesale price(s) in the derivation chain. Simply deriving new virtual products from those derivations does not, in itself, constitute copyright infringement (because it is a licensed activity that the underlying Creators have authorized).
http://www.imvu.com/catalog/creator_agreement.php