Premium hooks (host_cmds, flex-id and forensic-logging) can be
purchased as a package. However, several others (cb-cmds, RADIUS,
subnet-cmds, host-cache, class-cmds) are available to support
customers only. I believe this is clearly stated in the Kea ARM.
ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.