Each Party shall protect appellations of origin and geographical indications registered in its territory in its own legal order and in practice, but in accordance with the provisions of this Act, subject to refusal, renunciation, cancellation or erasure which may take effect in its territory and provided that the Contracting Parties which, in their national or regional legislation, are not linked to designations of origin and geographical indications, Member States are not required to introduce such a distinction in their national or regional legislation. (4) [safeguards in the event of notification of revocation of refusal or protection] Does a party that has refused the effects of an international registration under Article 15 by reason of its use under an earlier mark or other right within the meaning of this Article notify the withdrawal of that refusal in accordance with Article 16 or the grant of protection under Article 18; the protection of the resulting appellation of origin or geographical indication shall not affect that right or its use, unless protection has been granted after the right has been annulled, not extended, revoked or invalidated. . . .