The "free license" is effectively a feature-limited mode that activates automatically after the 14-day trial of the full software expires.
When you first install the software, it typically starts as a 14-day fully functional trial of the commercial edition. Reverting to Free: kiwi syslog server free license key top
If you need legal options for Kiwi Syslog Server: The "free license" is effectively a feature-limited mode