Nothing in this Agreement shall prevent a Contracting Party from taking any measures:

1. (a)

   which it considers necessary to prevent the disclosure of information contrary to its essential security interests;

2. (b)

   which relate to the production of, or trade in, arms, munitions and war materials or other products indispensable for defence purposes or to research, development or production indispensable for defence purposes, provided that such measures do not impair the conditions of competition in respect of products not intended for specifically military purposes;

3. (c)

   which it considers essential to its own security in the event of serious internal disturbances affecting the maintenance of law and order, in time of war or serious international tension constituting threat of war or in order to carry out obligations it has accepted for the purpose of maintaining peace and international security.