If it is not used as an official seal, it is not illegal, it is just a personal behavior. However, if it is used as an official seal, the company cannot engrave the seal privately, and can only entrust a specific company to engrave the seal, but the seal engraving company @ will accept the entrustment, because the trademark cannot engrave the official seal, because the trademark is not the subject; it is the brand; if you want to engrave the seal , you can only engrave a seal that is the same as the trademark, but this cannot be filed with the public security.