Abstract: A system includes a first apparatus and a second apparatus, the first apparatus comprises a detection unit configured to detect an error, and a notification unit configured to notify occurrence of the error, and the second apparatus comprises a reception unit configured to receive the notification, and a revocation unit configured to revoke a certificate of the first apparatus based on the notification received by the reception unit.

Abstract: A display controlling apparatus, connected to an input apparatus and a display apparatus, comprises: an acquiring unit of acquiring, from the input apparatus, image information of a first image displayed on a display screen of the input apparatus and cursor information indicating a display position of a first cursor image on the display screen; a deciding unit of deciding a display position of a second cursor image in a display range within which the display apparatus displays an image, based on the cursor information acquired by the acquiring unit; and a controlling unit of performing control to display a second image based on the acquired image information and the second cursor image on the display apparatus, and change, according to a change of a size of the second image to be displayed on the display apparatus, a size of the second cursor image to be displayed on the display apparatus.