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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
First part: Rules for the Control of Wireless Telegraphy in Time of War. - Art. 4.
Art. 4. A neutral Power is not bound to restrict or to forbid the use of the wireless stations situated within its jurisdiction, save as far as this may be necessary to prevent the transmission of information, intended for a belligerent, concerning the military forces or military operations, and save the case provided for in Article 5
Any restriction or prohibition enacted by a neutral Power shall apply to the belligerents uniformly.