Joint trademarks and defensive trademarks In our work, since we need to provide customers with a complete set of trademark protection solutions, joint trademarks and defensive trademarks will be involved. Joint trademark: refers to several similar trademarks registered by the same trademark owner on the same or similar goods. The main ones used among these trademarks are the original trademarks, and the others are joint trademarks of the original trademarks. For example, Dajijia, Jijiaji, Jizhu, etc. are the joint trademarks of Jijia. The purpose of registration of a joint trademark is not to use a trademark. The purpose is to protect the original trademark and prevent others from insinuating it. Therefore, the joint trademark is not subject to the provisions of revoking its registered trademark if it is not used for three years. When the joint trademark is transferred, it must be transferred together. Defensive trademark: refers to the trademark owner registering the same trademark on different categories of goods or services. The original trademark is the original trademark, and the trademark registered in other categories is a defensive trademark. From a legal perspective, defensive trademarks are mainly intended to protect well-known trademarks or famous trademarks. However, due to the current demand for intellectual property rights by enterprises, most enterprises will apply for defensive trademarks in the main relevant categories. Defensive trademarks can generally be regarded as being used together with the original trademarks. To determine the registration category of a defensive trademark, we generally consider that the products or services using the Tongzheng trademark have the same sales channels and consumer groups. According to the association theory of European intellectual property rights, goods with the same consumer groups and the same sales channels If the same or similar trademark is used, the brand value of the original trademark will be diluted and consumers will be confused.