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Draft International Convention on the Condition and Protection of Civilians of enemy nationality who are on territory belonging to or occupied by a belligerent. Tokyo, 1934.
Chapter II: Enemy civilians in the territory of a belligerent#Section I: General Provisions - Art. 5.
Article 5.- Those who are in preventive imprisonment or condemned to a sentence depriving them of liberty shall, on their liberation, benefit by the provisions of the present Convention.
The fact that they belong to an enemy State shall not increase the severity of the regime to which they are subjected.