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Restricted Data

Restricted Data (RD) is a category of classified information in the United States that is defined by the Atomic Energy Act of 1954 as:

all data concerning (1) design, manufacture, or utilization of atomic weapons; (2) the production of special nuclear material; or (3) the use of special nuclear material in the production of energy, but shall not include data declassified or removed from the Restricted Data category pursuant to section 142 [of the Act].

The fact that its legal definition includes "all data" except that already specifically declassified has been interpreted to mean that atomic energy information in the United States is born classified, even if it was not created by any agency of the U.S. government. The authority of the United States Department of Energy (DOE) to implement this authority as a form of prior restraint was only once tested in court, with inconclusive results.

"Restricted Data" should not be confused with the classification category of "Restricted", a relatively low category of classification. "Restricted Data" is not a level of classification; rather, a document can be classified as Confidential, Secret, or Top Secret, while also containing "Restricted Data." In addition, a document containing Restricted Data could also contain Critical Nuclear Weapon Design Information (CNWDI). 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.

Access to Restricted Data requires an L clearance or a Q clearance from the Department of Energy.

The concept was initially introduced, with similar wording, in the Atomic Energy Act of 1946. It was added at a relatively late moment to the bill by its creators, after the Gouzenko affair was leaked to the press and caused a fear of loss of "the secret" of the atomic bomb, as well as fears that the Espionage Act of 1917 was not sufficiently adequate.

The Atomic Energy Act of 1946 further specified that anyone who:

The act empowered and required the then-newly-created Atomic Energy Commission to regulate Restricted Data both internally and externally.

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legal category of US nuclear secrets
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