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"RequireAuth dbm=dbmfile userfile=database_name realm=string userpat=PATTERN
RequireAuth lets you ask the user for a username and a password when accessing the directory. dbm is a user database. Please note that dbm can only be used on a 2.x Enterprise user database. userfile is an NCSA-style user database filename. The file consists of lines in the format user:encrypted_password. realm is a unique string to tell your users which password they should use."