The scripts in this article require a recent version of the CGI module, version 2.49 or later. I used version 2.56. CGI is considered a "core Perl module." It's part of the standard Perl distribution, so you may already have it installed.
To access DB files, AuthDB.pm uses the DB_File module.
Both are available from CPAN at cpan.perl.com or at a mirror site near you. --BW