A system entity that requests and subsequently enforces authorization decisions.
Source(s):
CNSSI 4009-2015
NISTIR 7657
Mechanism (e.g., access control mechanism of a file system or Web server) that actually protects (in terms of controlling access to) the resources exposed by Web services.
Source(s):
NIST SP 800-95
under Policy Enforcement Point (PEP)
OASIS: A Brief Introduction to XACML