The following definitions apply to this part:

(a) “Original classification” is the initial determination that certain information requires protection against unauthorized disclosure in the interest of national security (i.e., national defense or foreign relations of the United States), together with a designation of the level of classification.

(b) “Classified national security information” or “classified information” means information that has been determined pursuant to Executive Order 13526 or any predecessor order to require protection against unauthorized disclosure and is marked to indicate its classified status when in documentary form.