Article XIX

This Convention shall not abrogate multilateral or bilateral conventions or arrangements in effect between two or more Contracting States. In the event of any difference between the provisions of such existing conventions or arrangements and the provisions of this Convention, the provisions of this Convention shall prevail. Rights in works acquired in any Contracting State under existing conventions or arrangements before the date on which this Convention comes into force in such State shall not be affected. Nothing in this article shall affect the provisions of articles XVII and XVIII of this Convention.