Assuming that the thief has plenty of sales, why go to all that trouble otherwise, is there not a business opportunity to be had here. Using services like Pixsy to litigate against the agencies that continue to allow known thieves to sell on there site. Obviously, the thief will get away because of the difficulty in pursuing these matters in certain countries, but the account will be shut down and the agencies will be forced to take more care with the images they accept. It maybe that the action needs to be taken against the customers, but will that then make them buy from more reputable agencies? Again location maybe a problem here. Anybody out there take this route already for good or ill, I would be interested in the outcome.