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NIST SP 800-53A Rev. 5
A combination of mutually-reinforcing privacy controls (i.e., safeguards and countermeasures) implemented by technical means (i.e., functionality in hardware, software, and firmware), physical means (i.e., physical devices and protective measures), and procedural means (i.e., procedures performed by individuals).
NIST SP 800-53A Rev. 4 [Superseded]