You can't do anything that would 100% provide it but you might try to at least convert some to sales. Code something that detects the tampering and either send

You can't do anything that would 100% provide it but you might try to at least convert some to sales. Code something that detects the tampering and either sends the info about it somewhere (that might not work if they just not allowed firewall out tho), then you might be able to send a letter to company (if that is company not just some random non-professional user). Probably illegal in EU tho. Or just have it display delayed warning/info notice about software being illegal and where you can buy legal copy. Disabling software is probably pointless (if it stops it from working they will find way around), but just "using this is illegal and can get you in trouble, contact with us to buy a legal copy, we offer bulk discounts" migtht get you some