What specific markings are required for documents to indicate they contain CUI?

The required marking for documents containing Controlled Unclassified Information (CUI) is that they must clearly display the phrase "Controlled Unclassified Information." This designation is crucial because it differentiates CUI from classified information, which has stricter handling and storage rules. The explicit labeling helps ensure that individuals processing the document are aware of its nature and understand the requirements for protecting such information.

By clearly indicating "Controlled Unclassified Information," it promotes proper management of this type of information, ensuring that those who handle it are trained to treat it according to specific guidelines, even though it is not classified in the traditional sense. This marking is a vital aspect of maintaining security protocols and ensures compliance with established regulations related to CUI, thereby enhancing the overall information security framework.