If you are using Cerberus for personal use only, you may continue to do so without requiring a license key. The "UNREGISTERED" text will still appear in the welcome message. Only licensed versions of Cerberus FTP Server do not display the "UNREGISTERED" welcome message. If you would like to get rid of the "UNREGISTERED" message in the welcome screen, you may purchase a license key. Otherwise, if you qualify for a personal use exemption you are free to continue to use Cerberus FTP Server Home edition for personal use, indefinitely.
NOTE: Unlicensed versions of Cerberus FTP Server will function as a Personal edition after the 25 day trial period has expired.