The Trusted Computer System Evaluation Criteria ( TCSEC ), the seminal work on the subject which is often referred to as the " Orange Book ", defines MAC as " a means of restricting access to objects based on the sensitivity ( as represented by a label ) of the information contained in the objects and the formal authorization ( i. e., clearance ) of subjects to access information of such sensitivity ".

The Trusted Computer System Evaluation Criteria ( TCSEC ) was the first evaluation criteria developed to assess MLS in computer systems.

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