Firebird Documentation Index → Firebird 2.5 Language Reference → System Tables → RDB$SECURITY_CLASSES
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RDB$SECURITY_CLASSES

RDB$SECURITY_CLASSES stores the access control lists

Column Name Data Type Description
RDB$SECURITY_CLASS CHAR(31) Security class name
RDB$ACL BLOB ACL The access control list related to the security class. It enumerates users and their privileges
RDB$DESCRIPTION BLOB TEXT Could store comments related to the security class

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Firebird Documentation Index → Firebird 2.5 Language Reference → System Tables → RDB$SECURITY_CLASSES