Expiration plus permanently activating by key
 

Hi folks,

can anyone point the way to implement a "30 day trial" within an Excel VBA
macro? I'm looking for something permanent, so that uninstalling the macro
and reinstalling will not grant another 30 day period.

The ability to activate the macro permanently by inserting a product key
would complete it. I believe that out there - or even inside the
object-library - are ready programmed functions, that are doing exactly
this. Any hint that helps to avaoid "inventing the wheel again" is welcomed.
Thanks in advance for assistance.


Best Regards
Peter Ostermann