What concept is used to determine the derivative classification of a new document created from existing classified information?

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The concept used to determine the derivative classification of a new document created from existing classified information is best described by the term "revealed by." This term refers to the process of uncovering or exposing the classified information contained within the original documents. When creating a new document that incorporates existing classified content, the new document’s classification must reflect the original classification decisions.

In the context of derivative classification, the information in the derived document can relate directly to the original sources, which maintain their classification status. Therefore, by determining how the information is revealed or presented in the new document, the classifier can establish the appropriate classification level necessary to protect that information.

The options "derived from," "specified by," and "informed by" do not convey the same direct relationship as "revealed by," which specifically implies the guidance received from the original classified material in assessing the classification of the new document.