§ 11.4 Definitions.

(a) Classified information. Official information which has been assigned a security classification category in the interest of the national defense or foreign relations of the United States.

(b) Classified material. Any document, apparatus, model, film, recording, or any other physical object from which classified information can be derived by study, analysis, observation, or use of the material involved.

(c) Marking. The act of physically indicating the classification assignment on classified material.

(d) National security information. As used in this order this term is synonymous with “classified information.” It is any information which must be protected against unauthorized disclosure in the interest of the national defense or foreign relations of the United States.