Sale of counterfeit goods remains widespread on online marketplaces like AliBaba, eBay, Etsy and Amazon. But brand owners are increasingly concerned about a related and, in some ways, more intractable problem: the unauthorized distribution of genuine merchandise. Policing knock offs may feel like a Sisyphean endeavor, with a new counterfeiter popping up the moment another is shut down in an endless game of ecommerce Whack-a-Mole. But it can be done. The bigger platforms typ