Resource Access Control Facility (RACF). IBM External Security Manager (ESM) for the mainframe. Developed in 1976 in response to the 1974 SHARE Security and Data Management project's requirement whitepaper. z/VM support added in 1984 with RACF/VM PRPQ (now RACF).
Originally a separate product. Now an optional component of z/OS.
Entry last updated: 16-Dec-2012