Classified information
Classified information is information the Government designates as requiring protection against unauthorized disclosure in the interest of national security, pursuant to E.O. 13526, Classified National Security Information, or any predecessor order, and the Atomic Energy Act of 1954, as amended. Classified information includes national security information (NSI), restricted data (RD), and formerly restricted data (FRD), regardless of its physical form or characteristics (including tangible items other than documents).