It is a common practice for large enterprises to "forge" their own trademark registration, which is called "defensive" by the industry. Some large enterprises and brands often register some trademarks that look like "shanzhai", but they are actually related, especially similar trademarks, which are called "defensive" registration in the industry. Many large enterprises have adopted the strategy of registering "defensive trademarks", that is, registering several similar trademarks in addition to the main business trademarks.