Artikel IV

Section 11
Each specialized agency shall enjoy, in the territory of each State party to this Convention in respect of that agency, for its official communications, treatment not less favourable than that accorded by the Government of such State to any other Government, including the latter's diplomatic mission, in the matter of priorities, rates and taxes on mails, cables, telegrams, radiograms, telephotos, telephone and other communications, and press rates for information to the press and radio.
Section 12
No censorship shall be applied to the official correspondence and other official communications of the specialized agencies.
The specialized agencies shall have the right to use codes and to dispatch and receive correspondence by courier or in sealed bags, which shall have the same immunities and privileges as diplomatic couriers and bags.
Nothing in this section shall be construed to preclude the adoption of appropriate security precautions to be determined by agreement between a State party to this Convention and a specialized agency.