US Patent 9740848 Authentication method using relative movement

A method for authentication of a user to a device by a remote server comprises a remote server initiates a local procedure on the device that causes the user to perform an act, wherein the act is observed by the device, and further wherein the act involves relative movement between the user and a camera, where fiducial marks are captured, and information transmitted to the server for the server to make a determination of whether to authorize the user to the device.