No, as long as your subscription is active. Carveco will continue to work just fine month-after-month without any need to re-enter your license details at the start of each billing cycle.
However, if you have a break in your subscription that results in Carveco being deactivated, you will need to purchase a new subscription and enter in the new license key to continue using the software.
Please Note: License keys are not applicable to customers with a Carveco Account (in beta).