Legal. Evidence of trademark infringement can be obtained in a variety of ways, including notarization. Notarization and evidence collection refers to the certification of relevant facts by a notary public, which has greater probative power and legal effect. When collecting evidence of trademark infringement, you can choose to purchase it accompanied by a notary to ensure that the evidence obtained is more convincing and authoritative, and to better protect your trademark rights. In this case, the role of the notary is to provide supervision and attestation to the authenticity and legality of the purchase and collection process.