HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod To generate a machine-readable full report:
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingMode (2 = Per Device, 4 = Per User) remote desktop licensing diagnoser
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingName remote desktop licensing diagnoser