legal ground
Article 52 of the Public Security Administration Punishment Law
Whoever commits one of the following acts shall be detained for more than 10 and less than 15, and may also be fined less than 1000 yuan; If the circumstances are relatively minor, he shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan: (1) Forging, altering or buying or selling official documents, certificates, certification documents and seals of state organs, people's organizations, enterprises, institutions or other organizations; (2) buying, selling or using forged or altered official documents, certificates and supporting documents of state organs, people's organizations, enterprises, institutions or other organizations; (3) Forging, altering or reselling tickets, boat tickets, air tickets, tickets for cultural performances, sports competitions or other valuable tickets; (4) Forging or altering a ship's registration number, trading or using a forged or altered ship's registration number, or altering a ship's engine number.