Desactivate a licensekey ?

[Carlit0]

Hi,
Here's my issue. I gave a key to someone in order to provide him a short trial time. But I'm afraid I enabled Run Time instead of Global Time. So I assume he can just close and reopen the software as his wishes.
Can I desactivate his license key? From my knowledge of Enigma I can't but maybe there's an alternative.

Thanks for help

[Enigma]

Hi, you may block this key by marking it as a stolen in License Manager or Keys Generator, then protect your file again.

After that, the protected application will not accept this key.

However, current application will accept it as well, there is no way to deactivate it.