You can remove a license from a domain using the Administrator tool or the
infacmd isp
RemoveLicense command.
Before you remove a license, disable all services assigned to the license. If you do not disable the services, all running service processes abort when you remove the license. When you remove a license, the Service Manager unassigns the license from each assigned service and removes the license from the domain. To re-enable a service, assign another license to it.
If you remove a license, you can still view License Usage logs in the Log Viewer for this license, but you cannot run the License Report on this license.