A method of displaying electronic documents on a vehicle display screen is described. The vehicle includes a display screen embedded in a window of the vehicle in a manner visible from outside the vehicle. The method includes storing the digital certificate in a memory unit of the control module. The method includes displaying information on the display screen by retrieving the digital certificate. Also, upon validating the digital certificate, the information associated with the digital certificate is displayed on the display screen, wherein the information includes an electronic document that indicates at least one of compliance with a local law, valid insurance, validation of payment of taxes associated with the vehicle, and a parking receipt for parking the vehicle, wherein the display screen comprises at least one button, manipulable by a user outside of said vehicle, to select a display mode of said display screen.