the proper use of a trademark refers to the use of the trademark by an entity or individual who owns the trademark or uses the trademark with the permission of the trademark owner. At the same time, the trademark is divided into 45 categories, and cross-category use may also lead to infringement. For example, your trademark is "XXX" category 25. Another company registered "XXX" category 35, so when you use a trademark, it involves 35 categories of content, which can be considered as infringing use. Also, the trademark you use is unregistered, but it is similar to the registered trademark of others, which also belongs to infringing use of trademarks.