When you purchase a product it comes with one license key that can be activated on 3/15/unlimited WordPress websites at a time, depending on the product (Basic 1/12 | Personal 1 | Freelancer 5 | Business unlimited).
Example 1:
If you bought the Basic product with 1 license then you can use the plugin on 1 WordPress websites at a time for 1 month.
Example 2:
If you bought the Freelancer product with 5 licenses then you can use the plugin on 5 WordPress websites at a time for the 1 year.
In the event you purge a site or uninstall the plugin you can login to the wpgeocontroller.com account (you receive credentials on purchase) and deactivate the license and use it on the another place.