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    $c{DBI_groupuserfield} = _dir_config_var( $r, 'DBI_GroupUserField' )
      || 'user';

=item C<WhatEverDBI_SecretKeyFile - DEPRECATED>

The file that contains the secret key (on the first line of the file).  This
is required and has no default value.  This key should be owned and only
readable by root.  It is read at server startup time.  The key should be long
and fairly random.  If you want, you can change it and restart the server,
(maybe daily), which will invalidate all prior-issued tickets.

This directive MUST be set before the PerlModule line that loads this module,
because the secret key file is read immediately (at server start time).  This
is so you can have it owned and only readable by root even though Apache
then changes to another user.

I suggest using DBI_SecretKey instead.

=cut