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davidcyclebackTiffany has a number of different legal arguments. In my opinion, if the whole thing went to trial, Tiffany would lose the major arguments (a higher court won't force eBay to be responsible for authenticating everything on eBay), but could win one or to lesser but not insignificant arguments. If it is shown that 95 percent of the Tiffany jewelry on eBay is fake (Tiffany's contention), Tiffany would have a good argument that eBay should not be allowed to advertise itself as a source of Tiffany jewelry (which it does).