46 CFR § 503.55 - Derivative classification.
(a) In accordance with Part 2 of Executive Order 13526 and directives of the Information Security Oversight Office, the incorporation, paraphrasing, restating or generation in new form of information that is already classified, and the marking of newly developed material consistent with the classification markings that apply to the source information, is derivative classification.
(2) The duplication or reproduction of existing classified information is not derivative classification.
(b) Members or employees applying derivative classification markings shall:
(1) Observe and respect original classification decisions; and
(2) Carry forward to any newly created documents the pertinent classification markings.
(3) For information derivatively classified based on multiple sources, the Member or employee shall carry forward:
(ii) A listing of these sources on or attached to the official file or record copy.
(1) Classification authority. The authority for classification shall be shown as follows:
(iii) In these cases, the derivative classifier shall maintain the identification of each source with the file or record copy of the derivatively classified document. A document derivatively classified on the basis of a source document that is marked “Classified by Multiple Sources” shall cite the source document in its “Classified by” line rather than the term “Multiple sources.”
(2) Declassification and downgrading instructions. Date or events for automatic declassification or downgrading, or the notation “Originating Agency's Determination Required” to indicate that the document is not to be declassified automatically, shall be carried forward from the source document, or as directed by a classification guide, and shown on “declassify on” line as follows:
“Declassify on: (date, description of event);” or “Originating Agency's Determination Required (OADR).”