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If you set the policy, Google ChromeOS
downloads and uses the wallpaper image you set for the user's desktop and sign-in screen background, and users can't change it. Specify the URL (that's accessible without authentication) which Google ChromeOS
can download the wallpaper image from, as well as a cryptographic hash (in JPEG format with a file size up to 16 MB) to verify its integrity.
If not set, users choose the image for the desktop and sign-in screen background.