Article 81

Apart from the grounds for revocation provided for in Article 58, the rights of the proprietor of an EU collective mark shall be revoked on application to the Office or on the basis of a counterclaim in infringement proceedings, if:
(a) the proprietor does not take reasonable steps to prevent the mark being used in a manner incompatible with the conditions of use, where these exist, laid down in the regulations governing use, amendments to which have, where appropriate, been mentioned in the Register;
(b) the manner in which the mark has been used by the proprietor has caused it to become liable to mislead the public in the manner referred to in Article 76(2);
(c) an amendment to the regulations governing use of the mark has been mentioned in the Register in breach of the provisions of Article 79(2), unless the proprietor of the mark, by further amending the regulations governing use, complies with the requirements of those provisions.