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Have you considered something like this:
If the software triggers a license revalidation, do not immediately kick the user out, instead warn the user that they have 1 week to get it sorted before it deactivates. However, and here's the part to make sure that fooling around with the system clock doesn't work, during that 1 week grace period require an internet connection to start the program.
This kind of stuff is my day job, so if you want to seriously consider it, feel free to mail me for some implementation help.
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