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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section IV : On the rights and duties of the belligerent with regard to enemy property - Art. 50.
Art. 50. Rights of the belligerent in the zone of operations. When a belligerent has not the right of seizing or of capturing enemy vessels, he may, even on the high seas, forbid them to enter the zone corresponding to the actual sphere of his operations.
He may also forbid them within this zone to perform certain acts calculated to interfere with his activities, especially certain acts of communication, such, for example, as the use of wireless telegraphy.
The simple infraction of these prohibitions will entail driving the vessel back, even by force, from the forbidden zone and the sequestration of the apparatus. The vessel, if it be proved that it has communicated with the enemy to furnish him with information concerning the conduct of hostilities, can be considered as having placed itself at the service of the enemy and, consequently, with its apparatus, shall be liable to capture.