I am getting ready to wright a registration key for my program. This
is so I can distribute the program say for 30 days and at the end of
that 30 days the user will have to register the program or it will not
run. This program will be encrypted So no they can not mess with the
code. I would like it to be based on there domain name and also date
of purchase. I am not sure how to go about this and I would really like some
pointers in what direction I should go to do this. Sort of an outline
on what I need to do to the program itself and how to generate a
different key for each customer.

Best regards,

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