The Member States 25 March 1957, Consolidated version of the Treaty establishing the European Atomic Energy Community#TITLE V - General provisions#Article 196

4. Any authorisation granted either by an institution of the Community or by a Member State to a person carrying out his activities within the field covered by this Treaty to have access to facts, information, documents or objects covered by this Treaty which are subject to a security system, shall be recognised by every other institution and every other Member State. 5.