| 摘要 |
A computer implemented method, computer program, data processing device and user interface for controlling display of an image by a program on display device are described. The method includes detecting a command to cause the program to display the image. A password for the program is displayed on the display in a format that depends on at least one characteristic relating to the image quality of the display such that the password can only be perceived by the user if the display is configured to allow the image to be viewed reliably. The program is allowed to display the image if a password entered by the user corresponds to the displayed password and is not allowed to display the image if a password entered by the user does not correspond to the displayed password.
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