What marking is required on each page of CUI documents?

• A. CUI marking at the top and bottom of each page.
• B. FOUO marking on every page.
• C. No marking required on internal pages.
• D. A classification stamp indicating secret level.

Answer: (B)

Per-page marking communicates sensitivity clearly and consistently throughout the document’s life cycle. Applying FOUO on every page ensures that anyone who handles the material—even if pages are copied, shared, or separated—still sees the sensitivity indicator and understands the required safeguards. This per-page cue helps prevent inadvertent disclosure by making the handling requirements visible wherever the pages go.

If pages are left unmarked or marked inconsistently, the responsibility for protecting the information can be lost as documents are distributed, copied, or archived. Stamping with a secret classification would be inappropriate for CUI, since CUI is unclassified by definition. Similarly, relying only on a single marking or no marking on internal pages would reduce visibility of the sensitivity. Placing a FOUO mark on every page provides a clear, uniform signal that the document contains sensitive information and must be handled accordingly.