Legal analysis: The main legal functions of trademarks are: 1. Indicate the origin of goods, which is the most essential and basic function of trademarks to distinguish the same goods or services; Second, the supervisory role of commodity quality; Third, the guiding role of commodity purchase; Fourth, the advertising function of commodity sales.

Legal basis: Article 3 of the Trademark Law of People's Republic of China (PRC) is a registered trademark, including commodity trademark, service trademark, collective trademark and certification trademark; Trademark registrants enjoy the exclusive right to use trademarks and are protected by law.

The term "collective trademark" as mentioned in this Law refers to a sign registered in the name of a group, association or other organization for members of the organization to use in business activities, so as to show the membership of users in the organization.

The term "certification trademark" as mentioned in this Law refers to a mark controlled by an organization with the ability to supervise goods or services and used by units or individuals outside the organization to prove the origin, raw materials, manufacturing methods, quality or other specific qualities of the goods or services.

Special matters concerning the registration and management of collective trademarks and certification trademarks shall be stipulated by the administrative department for industry and commerce of the State Council.