a trademark licensing contract does not have to be filed with the trademark office, and filing is not an effective requirement of a trademark licensing contract. Except for the types of contracts whose entry requirements are filing and registration as stipulated by laws and regulations, general contracts (including trademark use contracts) have come into effect after being signed and sealed by both parties, provided that both parties agree on their intentions and the form and content are not illegal. However, according to the laws of our country, if the trademark license contract is not filed with the Trademark Office, it shall not be opposed to a bona fide third party, which means that both parties to the license shall not claim the effectiveness of the trademark license against a bona fide third party without filing, provided that the third party should be bona fide. A trademark licensing contract is legal and valid without filing as long as both parties reach an agreement.

Reference Law: Interpretation of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Trademark Civil Disputes Article 19 If a trademark license contract is not filed, it will not affect the validity of the license contract, unless otherwise agreed by the parties.

if the trademark license contract is not filed in the trademark office, it shall not be opposed to a bona fide third party.