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In this way, a document, for instance, could be classified as "Secret" (S), "Secret//Restricted Data" (S//RD), or "Secret//Restricted Data-Critical Nuclear Weapon Design Information" (S//RD-CNWDI) depending on the type of information a document contains. Formerly Restricted Data (FRD) is a category also designated in the Atomic Energy Act of ...
The lower-level L clearance is sufficient for access to Secret Formerly Restricted Data and National Security Information, as well as Confidential Restricted Data and Formerly Restricted Data. [58] In practice, access to Restricted Data is granted, on a need-to-know basis, to personnel with appropriate clearances.
The term "Restricted Data" is used to denote certain nuclear technology. Information about the storage, use or handling of nuclear material or weapons is marked "Formerly Restricted Data". These designations are used in addition to level markings (Confidential, Secret and Top Secret).
PARD (Protect as restricted data) is an unclassified but sensitive marking used in the Department of Energy. It is the marking that was on Dr. Wen Ho Lee's program codes at Los Alamos National Laboratory. He (and many other scientists) backed up such data to tape.
For example, the title of a Secret report is often unclassified, and must be marked as such. Material that is classified as Unclassified // For Official Use Only (U//FOUO) is considered between Unclassified and Confidential and may deal with employee data.
An example of compartmentalization was the Manhattan Project. Personnel at Oak Ridge constructed and operated centrifuges to isolate uranium-235 from naturally occurring uranium, but most did not know exactly what they were doing. Those that knew did not know why they were doing it.
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Very Restricted Knowledge (VRK) Exceptionally Controlled Information (ECI), which was used to group compartments for highly sensitive information, but was deprecated as of 2011. [8] SI-GAMMA (SI-G, SI-G-AAAA, AAAA represents 4 alpha characters to indicate sub Gamma compartments), which has subcompartments identified by four alphanumeric ...