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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. 8.
Art. 8. Neutral mobile wireless stations shall abstain from keeping a written copy of wireless messages received from belligerent military wireless stations, unless such messages are destined for the said neutral stations.
The violation of this rule entitles the belligerents to confiscate the texts in question.