Lipreader is a program available from the United Kingdom through the company David Smith Software. The software uses a graduated approach, starting with letters and sounds and advancing to full sentences. Users can control the speed of the speech. Lip reading has been performed by both software systems and humans, with automated systems outperforming humans in some instances. Facial recognition can also be used to identify humans 9, directly; however, other techniques 6 may be needed to verify that the is live, and not pre-recorded, input designed to fool a system.