Publication 835: Article 4

Article 4
Effects of the Non-Recordal of a License

(1) [ Validity of the Registration and Protection of the Mark] The non-recordal of a license with the Office or with any other authority of the Member State shall not affect the validity of the registration of the mark which is the subject of the license, or the protection of that mark.

(2) [ Certain Rights of the Licensee] (a) A Member State may not require the recordal of a license as a condition for any right that the licensee may have under the law of that Member State to join infringement proceedings initiated by the holder or to obtain, by way of such proceedings, damages resulting from an infringement of the mark which is the subject of the license.