An access control method based on the subject's clearance and the object's classification is referred to as mandatory access control.
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Mandatory access control, or MAC for short, is a type of access control used in computer security that limits a subject's or initiator's ability to access or otherwise interact with a target or object.
Operating systems typically use objects like files, directories, TCP/UDP ports, shared memory segments, IO devices, etc. as opposed to subjects like processes or threads. There are specific security attributes that apply to both subjects and objects.
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