(By Luo Yanjie) Abstract: In the event that a party unknowingly sells goods that infringe upon another party’s exclusive right to use a registered trademark but can prove that it has obtained the goods lawfully and is able to identify the supplier shall not be held liable for damages. In a case that a trademark holder separately sues sellers, despite no laws requesting the manufacturers to join in the lawsuit, for the purpose of preventing contradictory judgment, the courts could notify him or her requesting joinder. It is the manufacturers that could decide whether acting as a third party to join the lawsuit.