No, your current paid Docmosis license key will not stop working. All paid license keys for Tornado and Docmosis-Java are perpetual and do not expire.
When you renew your license, you’re purchasing a further 12 months of access to support and software updates.
As part of the renewal process, you will receive a new license key. This new license key will work with new versions of the software released during the next 12 months.
There’s no need to use the new key right away. You should apply the renewal license key when updating to a newer version of Tornado or Docmosis-Java.