You can license a plugin on as many as three different machines simultaneously.
If you want to reclaim one of your authorizations from a machine you are no longer using, you can log into your account and go to Manage Devices. You will see a list of your activated devices, with a “Deactivate” button next to each one. You do not need to have access to a machine to deactivate it. So if your computer is stolen or crashes, you can still reclaim its licenses on the Manage Devices page.
Sometimes customers confuse the deletion limit with the machine authorization limit, but they are separate.
The deletion limit is a way to prevent abuse, but we do understand that it can be an inconvenience, so we're pretty flexible.