Materials required for trademark change: (1) "Application for Trademark Change"; (2) The applicant's subject qualification certification documents (such as a copy of the enterprise's business license, the natural person's ID card/passport, etc.) A copy of the applicant's seal or signature; (3) A copy of the identity card of the person in charge if the applicant directly handles the application at the trademark registration hall; a "Letter of Agency" entrusted to a trademark agency to handle the matter. Article 41 of the Trademark Law