LE TITULAIRE D'UNE AUTORISATION NE PEUT APPORTER AUCUNE MODIFICATION AUX CONDITIONS AUXQUELLES L'EXPLOITATION DU SERVICE EST SOUMISE , SANS L'AUTORISATION PREALABLE DE L'ETAT MEMBRE VISE A L'ARTICLE 12 PARAGRAPHE 2 , NI SUPPRIMER LE SERVICE AVANT QUE L'AUTORISATION NE PERDE SA VALIDITE .
THE HOLDER OF AN AUTHORIZATION SHALL NOT , WITHOUT PRIOR AUTHORITY FROM THE MEMBER STATE REFERRED TO IN ARTICLE 12 ( 2 ) , IN ANY WAY VARY THE CONDITIONS SUBJECT TO WHICH THE SERVICE IS OPERATED , NOR SHALL HE WITHDRAW A SERVICE BEFORE THE PERIOD OF VALIDITY OF THE AUTHORIZATION HAS EXPIRED .