A 1 year service agreement is included with every license.
If you are just looking to renew your service agreement on an existing license, please indicate it here.
Renewing your service agreement provides support and upgrades to the latest major release.
How many licenses are you interested in? Licenses are per-machine. You need one license for each server you are installing Cerberus FTP Server on.
Are you a reseller looking to resell this license?