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NIST 800-171 R-3.8.4

Mark Media with CUI Markings

Official citation: 3.8.4

Class: core · Severity: medium

Statement of the obligation — verify against source

3.8.4

What it means

Mark media with the required CUI markings and any distribution limitations so anyone who handles it knows the information is controlled and how it may be shared. Marking applies to digital and paper media, though agency policy may exempt media kept within clearly controlled environments.

Educational reference only — not legal advice. Consult a qualified assessor or attorney for binding compliance determinations.