Controlled Unclassified Information (CUI)

Controlled Unclassified Information (CUI) is information that is not classified under national security classification rules, but is still considered sensitive and requires specific safeguarding, dissemination controls, and handling based on applicable laws, regulations, or government-wide policies.

Key characteristics

In industrial and manufacturing contexts, CUI commonly includes information created by or for the U.S. federal government, or held on its behalf, such as:

• Technical data about defense or aerospace components that is restricted but not formally classified
• Engineering drawings, CAD models, specifications, and bills of materials associated with government contracts
• Test data, inspection records, and quality documentation related to controlled programs
• Certain program schedules, cost data, and performance reports tied to government work
• Maintenance, repair, and overhaul (MRO) records for controlled platforms and equipment

CUI is defined and governed in the United States by the CUI program and related regulations and guidance. It is typically marked or identified according to established categories and handling practices.

How CUI shows up in manufacturing systems

Within industrial operations and OT/IT environments, CUI can reside in many systems and workflows, for example:

• MES and ERP records containing controlled part definitions, routings, and traveler details
• PLM and document management systems holding controlled drawings, models, and work instructions
• Digital work instructions, electronic DHRs or DMRs, and as-built traceability records that reference CUI-controlled designs
• Supplier portals and outsourced processing packages that transmit controlled technical data
• Backups, logs, email, and collaboration tools that store or exchange CUI content

Operationally, handling CUI often requires:

• Defined access controls and user permissions in OT/IT systems
• Secure data transfer and storage practices, including for cloud or remote access solutions
• Controls over printing, exporting, and sharing technical data with suppliers and partners
• Traceability of who accessed or modified CUI-relevant records

Relationship to other cybersecurity and regulatory requirements

CUI is closely related to several cybersecurity and defense compliance frameworks that apply to manufacturers and industrial operators working with government or defense customers. These include, for example:

• Requirements that specify how CUI should be protected in information systems and environments
• Contract clauses that reference safeguarding and incident reporting obligations for CUI
• Assessment or maturity models that evaluate whether an organization appropriately protects CUI in its operations

OT and manufacturing teams often need to coordinate with IT, security, and compliance functions to ensure that production equipment, data flows between MES/ERP/PLM, and supplier integrations treat CUI consistently with these expectations.

What CUI is not

• It is not classified information that is formally designated as Confidential, Secret, or Top Secret.
• It is not fully public information that can be disclosed without restriction.
• It is not limited to defense technical data; CUI can also cover other regulated categories such as certain financial, privacy-related, or critical infrastructure information when specified by applicable authority.

Common confusion

• CUI vs. ITAR-controlled data: ITAR-controlled technical data is subject to specific export control rules. Some ITAR data may also be treated as CUI, but the terms are not interchangeable. ITAR relates to export control, while CUI is a broader marking and handling framework for sensitive but unclassified information.
• CUI vs. proprietary or trade secret information: Company proprietary data and trade secrets are owned and controlled by the company. CUI is defined by government authority. A document can contain both proprietary information and CUI, but proprietary marking alone does not make something CUI.
• CUI vs. general confidential information: Many organizations use “confidential” as an internal label. CUI specifically refers to information that falls under the formal CUI program or similar defined schemes, not all internal confidential data.

Manufacturing-relevant examples

• An aerospace machine shop receives a model-based definition file for a flight-critical bracket on a defense platform. The model and derived work instructions are treated as CUI in the MES, PLM, and document control systems.
• A contract manufacturer uploads first article inspection results and serialized as-built data for a government contract part. The reports are stored and shared as CUI, with controlled access, logging, and restricted distribution.
• An MRO facility maintains overhaul records and configuration histories for a controlled asset. Digital travelers, inspection logs, and photos that reveal design or performance details may be handled as CUI.

Use in site context

On this site, CUI typically appears in discussions about cybersecurity and regulatory alignment for manufacturers, including how to structure MES/ERP/PLM integrations, digital work instructions, and supplier collaboration so that CUI and other controlled technical data are handled in a consistent and documented way.