Trademark infringement often occurs in China, and many defendants due to trademark infringement go to court to determine trademark ownership. So in a trademark infringement case, we must have evidence of trademark use, that is, certification materials for trademark use. So what are the certification materials for these trademark uses? Specifically, it includes the following aspects: 1. The actual use of the trademark logo; 2. Advertisements, samples, and product manuals with trademark words or pictures; 3. Various transaction documents (invoices, contracts, customs declarations, etc.) with trademark words or pictures; 4. Product packaging or containers with trademark words or pictures ; 5. Photos of exhibitions, trade fairs, and service venues with trademark words or pictures; 6. Newspapers, magazines, promotional materials, etc. with trademark words or pictures. If you have the above-mentioned materials and documents, it can prove that you have evidence of trademark use. Other materials that can be used as evidence of trademark use include product instructions, commodity import and export inspection and quarantine certificates, product customs declarations, etc. However, none of the above-mentioned single materials may be able to fully prove the use of a trademark. Therefore, multiple evidence materials are often required to corroborate and correlate with each other to form an effective evidence chain to fully prove the use of a trademark. Trademark use