LogonBox VPN Professional, and Enterprise Editions are licensed based on the number of active users of the system. License are taken when a user logs in and generates a configuration for one of their devices. Users can have multiple devices registered, up to the limit supported by the type of license purchased. There is no concurrency limit; users can have multiple devices connected at the same time whilst only consuming a single user license.
Purchase a perpetual, non-expiring license. With this option the software will continue to function even if support & maintenance is not renewed at the end of the support term.
In addition to Professional Edition: