1. [Notifications] Any Contracting Party may denounce this Convention by notification addressed to the Secretary-General. The Secretary-General shall promptly notify all members of the Union of the receipt of that notification.
2. [Earlier Acts] Notification of the denunciation of this Convention shall be deemed also to constitute notification of the denunciation of any earlier Act by which the Contracting Party denouncing this Convention is bound.
3. [Effective date] The denunciation shall take effect at the end of the calendar year following the year in which the notification was received by the Secretary-General.
4. [Acquired rights] The denunciation shall not affect any rights acquired in a variety by reason of this Convention or any earlier Act prior to the date on which the denunciation becomes effective.