Method for supplying data to remotely cultivate a digital content reference library, to be executed by an electronic terminal device capable of visually displaying digital content to a user and communicating with a communications network, comprising establishing, by automatic observation logic, visual characteristics data representing the on-screen appearance of digital content, such as application, shown via a display of the terminal device (406), and transmitting the visual characteristics data to a remote server for updating a digital content reference library thereat linking content identity information with associated visual characteristics data in the received or processed form (408). A compatible method to be executed on the network side is presented as well as related, applicable terminal devices and server arrangements.