(1) Where any country outside the Union fails to protect in an adequate manner the works of authors who are nationals of one of the countries of the Union, the latter country may restrict the protection given to the works of authors who are, at the date of the first publication thereof, nationals of the other country and are not habitually resident in one of the countries of the Union. If the country of first publication avails itself of this right, the other countries of the Union shall not be required to grant to works thus subjected to special treatment a wider protection than that granted to them in the country of first publication.

(2) No restrictions introduced by virtue of the preceding paragraph shall affect the rights which an author may have acquired in respect of a work published in a country of the Union before such restrictions were put into force.

(3) The countries of the Union which restrict the grant of copyright in accordance with this Article shall give notice thereof to the Director General of the World Intellectual Property Organization (hereinafter designated as "the Director General") by a written declaration specifying the countries in regard to which protection is restricted, and the restrictions to which rights of authors who are nationals of those countries are subjected. The Director General shall immediately communicate this declaration to all the countries of the Union.