DeviceLock Service : Managing DeviceLock Service for Windows : Service Options : Anti-keylogger : Block keyboard
  
Block keyboard
Enable this parameter to block the keyboard connected to the hardware USB keylogger when it is detected.
Since DeviceLock Service starts before the user logs in to Windows, it can block the keyboard and prevent the user from typing the password.
 
Note: Some hardware keyloggers continue to record keystrokes even if the keyboard is blocked and not functioning in Windows. This happens because such keyloggers are standalone devices and do not require any OS or drivers.