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Default Timebomb protection of Code

Hi,

I am writing a little VBA application and will sell this to a small company.
However, I want to give them a license to use it only for 3 months.
How can I make sure the application will not work anymore after 3 months?

And how can I program something that will clear the whole VBA code if
somebody tries to break into the code?

Regards,
Frans


 
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