what is the purpose of isoo cui registry

The purpose of the ISOO CUI Registry is to provide a standardized, government- wide framework for how executive branch agencies handle Controlled Unclassified Information (CUI). It serves as a comprehensive reference that lists and defines all approved categories and subcategories of CUI, ensuring uniform definitions and consistent responsibilities for protecting and marking sensitive but unclassified information across federal agencies and contractors. The registry helps agencies determine what information must be marked as CUI, how it should be marked, and the safeguarding requirements to prevent unauthorized access or disclosure. It essentially establishes a single, clear source for managing CUI to avoid inconsistent protection practices and security risks.