回複：什麽是TRADE MARK? EBAY不許我轉賣不要的wireless fence, 有這個法律嗎？

That does not sound right. If that is the case, Ebay would not be existence. In interllectual property law, there is a doctrine called first sale, meaning once the IP holder sells the product, he or she cannot prevent you from reselling. You may have to re-read the ebay letter to ascertain what is really going on.