Each Contracting Party shall protect registered appellations of origin and geographical indications on its territory, within its own legal system and practice but in accordance with the terms of this Act, subject to any refusal, renunciation, invalidation or cancellation that may become effective with respect to its territory, and on the understanding that Contracting Parties that do not distinguish in their national or regional legislation as between appellations of origin and geographical indications shall not be required to introduce such a distinction into their national or regional legislation.