According to Shengjie Legal Inquiry, one can sue for infringement with just one doorstep. A single door may constitute infringement and require compensation. When it comes to Mentou trademark infringement, penalties can be imposed according to Article 27 of the "Enterprise Name Registration Management Regulations". According to this provision, if there is any unauthorized use of another person’s registered business name or other acts that infringe on the exclusive rights of another person’s business name, the infringed party may request handling from the registration authority where the infringer is located. The registration authority has the power to order the infringer to stop the infringement, compensate the infringer for the losses suffered due to the infringement, confiscate the illegal gains, and impose a fine of not less than 5,000 yuan but not more than 50,000 yuan. For acts that infringe on the exclusive rights of others' business names, the infringed party may also directly file a lawsuit in the People's Court. Legal basis: Article 120 of the "People's Republic of China and Civil Code": If civil rights and interests are infringed, the infringed party has the right to request the infringer to bear tort liability.