Protect the screen-address against outside viewing
Keep the screen-address/URL secret
The screen address/URL is a code which in itself provides protection against outside viewing. The address shall not be spread og used other places than on the public screen.
If you have a suspicion that your address has become known or opened by unauthorized people, you can create a new address for the screen. You do this by going to "Screens" and click on "Settings" for a screen, then choose "Security". On the top of this page there is a button for making a new screen-address.
Under the security-tab for the screen (see above), there is an option for adding a password which must be added each time the screen is opened. When you open the screenaddress/URL you must then add the password for the screen display to start.
A disadvantage with the use of password, is that it cannot be combined with autostart and fullscreen.
You can make it so that only machines with certain IP-addresses will be able to open your screen-content. If you try to open the screen-address/URL on machines with different IP-addresses, the content wil not be displayed.
You register this also under the security-tab in settings for screen. Here you also find a list of the IP-addresses where the screen has been opened, and a simple way to approve the IP-addresses it has been open on.