Other options We had this happen too. In our case, our software required our hardware to function so we put the recurring license on the hardware instead of th

Other options We had this happen too. In our case, our software required our hardware to function so we put the recurring license on the hardware instead of the software. It's been about 8 years since then and nobody has been able to crack that system yet. Some software that doesn't need hardware also uses a small hardware key to enforce licensing. Going forward, you could make it so the user has to login to your service when they launch your software. You could provide extra value to your paying customers through this channel too. You would run into some other challenges such as shared passwords, but those have some mitigation strategies too.