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numbers once is a while, hence the validation function.

The calculate/generate1968 function is however a different story. When I was in
school we where programming in Comal80 and some of the guys in my school created
lists of CPR numbers valid with their own birthdays. The thing was that if you
got caught riding the train without a valid ticket the personnel would only
check the validity of you CPR number, so all you have to remember was your
birthday and 4 more digits not being the actual last 4 digits of your CPR
number.

I guess this was the first hack I ever heard about and saw - I never tried it
out, but back then it really fascinated me and my interest in computers was
really sparked.

=head1 AUTHOR

=over

=item * Jonas B., (jonasbn) - C<< <jonasbn@cpan.org> >>

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