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A safeguard (also called control or countermeasure) is

a technology, policy, or procedure that counters a threat or protects assets.[1]
[a]ny action, device, feature, mechanism, procedure, technique, or other measure that reduces the vulnerability of or threat to a system.[2]
[a]ll measures taken to protect classified national intelligence, including Sensitive Compartmented Information from unauthorized disclosure.[3]
protective measures prescribed to meet the security requirements (i.e., confidentiality, integrity, and availability) specified for an information system. Safeguards may include security features, management constraints, personnel security, and security of physical structures, areas, and devices.[4]


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