HIDDEN

The keyword HIDDEN in this field indicates that the ACE is managed by
a particular application, and not the operating system proper.  The
format for this ACE is:

            (type,OPTIONS=HIDDEN {,ACCESS=access_to_grant})

'type' may be any ACE type from the set: IDENTIFIER, ALARM_JOURNAL, or
DEFAULT_PROTECTION.  'access_to_grant' may be any of the set: READ,
WRITE, EXECUTE, DELETE, and/or CONTROL.