1. In countries where the legislation so authorizes, Offices notified by the International Bureau of the registration of a mark or of a request for extension of protection made in accordance with Article 3ter shall have the right to declare that protection cannot be granted to such mark in their territory. Any such refusal can be based only on the grounds which would apply, under the Paris Convention for the Protection of Industrial Property, in the case of a mark filed for national registration. However, protection may not be refused, even partially, by reason only that national legislation would not permit registration except in a limited number of classes or for a limited number of goods or services.
2. Offices wishing to exercise such right must give notice of their refusal to the International Bureau, together with a statement of all grounds, within the period prescribed by their domestic law and, at the latest, before the expiration of one year from the date of the international registration of the mark or of the request for extension of protection made in accordance with Article 3ter.
3. The International Bureau shall, without delay, transmit to the Office of the country of origin and to the proprietor of the mark, or to his agent if an agent has been mentioned to the Bureau by the said Office, one of the copies of the declaration of refusal so notified. The interested party shall have the same remedies as if the mark had been filed by him direct in the country where protection is refused.
4. The grounds for refusing a mark shall be communicated by the International Bureau to any interested party who may so request.
5. Offices which, within the aforesaid maximum period of one year, have not communicated to the International Bureau any provisional or final decision of refusal with regard to the registration of a mark or a request for extension of protection shall lose the benefit of the right provided for in paragraph (1) of this Article with respect to the mark in question.
6. Invalidation of an international mark may not be pronounced by the competent authorities without the proprietor of the mark having, in good time, been afforded the opportunity of defending his rights. Invalidation shall be notified to the International Bureau.