HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod To generate a machine-readable full report: remote desktop licensing diagnoser
licdiag /verbose > C:\RDS_Licensing_Report.txt Or for users (gather equivalent info): 4 = Per User)
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingMode (2 = Per Device, 4 = Per User) remote desktop licensing diagnoser