Article 29

1. After this Convention has been in force for five years, any Contracting State may, by notification addressed to the Secretary-General of the United Nations, request that a conference be convened for the purpose of revising the Convention. The Secretary-General shall notify all Contracting States of this request. If, within a period of six months following the date of notification by the Secretary-General of the United Nations, not less than one half of the Contracting States notify him of their concurrence with the request, the Secretary-General shall inform the Director-General of the International Labour Office, the Director-General of the United Nations Educational, Scientific and Cultural Organization and the Director of the Bureau of the International Union for the Protection of Literary and Artistic Works, who shall convene a revision conference in co-operation with the Intergovernmental Committee provided for in Article 32.

2. The adoption of any revision of this Convention shall require an affirmative vote by two-thirds of the States attending the revision conference, provided that this majority includes two-thirds of the States which, at the time of the revision conference, are parties to the Convention.

3. In the event of adoption of a Convention revising this Convention in whole or in part, and unless the revising Convention provides otherwise:

(a) this Convention shall cease to be open to ratification, acceptance or accession as from the date of entry into force of the revising Convention;

(b) this Convention shall remain in force as regards relations between or with Contracting States which have not become parties to the revising Convention.