The Orange Book, and others in the Rainbow Series, are still the benchmark for systems produced almost two decades later, and Orange Book classifications such as C2 provide a shorthand for the base level security features of modern operating systems.
Actual copies of the Orange Book are notoriously difficult to obtain for anyone not working for the US Government, which makes understanding the security ratings difficult. The actual Orange Book itself is a long, repetitive documents that can baffle casual observers. This site will help you to understand this sometimes difficult topic
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Computer Security Basics