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A system entity that makes authorization decisions for itself or for other system entities that request such decisions.
CNSSI 4009-2015 from NISTIR 7657
Mechanism that examines requests to access resources, and compares them to the policy that applies to all requests for accessing that resource to determine whether specific access should be granted to the particular requester who issued the request under consideration.
NIST SP 800-95 under Policy Decision Point (PDP) from OASIS: A Brief Introduction to XACML