Abstract: A system and method for secure cloud storage of client-side encrypted data using a hierarchical encryption structure and a hierarchical storage structure to provide hierarchical key management and hierarchical data access.

Abstract: A method, comprising: (a) measuring coordinates of four or five fiducial markers in facial images of a subject captured by a camera facing away from a screen toward the subject; (b) optimising and reducing a multivariate polynomial model that maps the measured coordinates of the four or five fiducial markers in the facial images to estimated coordinates of gaze targets of the subject on the screen; and (c) using the reduced multivariate polynomial model to map the measured coordinates of the four or five fiducial markers to the estimated coordinates of gaze targets of the subject on the screen.

Abstract: A method, comprising: (a) measuring coordinates of four or five fiducial markers in facial images of a subject captured by a camera facing away from a screen toward the subject; (b) optimising and reducing a multivariate polynomial model that maps the measured coordinates of the four or five fiducial markers in the facial images to estimated coordinates of gaze targets of the subject on the screen; and (c) using the reduced multivariate polynomial model to map the measured coordinates of the four or five fiducial markers to the estimated coordinates of gaze targets of the subject on the screen.