The HRU security model (Harrison, Ruzzo, Ullman model) is an operating system level security model which deals with the integrity of access rights in the system. The system is based around the idea of a finite set of procedures being available to edit the access rights of a subject s on an object o .

United Nations (U.N.)Human Rights Unit

Hydrostatic Release Unit. A device which senses water pressure and allows an EPIRB to be released from its bracket at approximately 4 m (13.1 ft) of depth.

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