1. The Constitution shall not preclude the application of the following rules:

(a) no Member State shall be obliged to supply information the disclosure of which it considers contrary to the essential interests of its security;

(b) any Member State may take such steps as it considers necessary for the protection of the essential interests of its security which are connected with the production of or trade in arms, munitions and war material; such steps shall not adversely affect the conditions of competition in the internal market regarding products which are not intended for specifically military purposes.

2. The Council, on a proposal from the Commission, may unanimously adopt a European decision making changes to the list of 15 April 1958, of the products to which the provisions of paragraph 1(b) apply.