This policy setting allows you to remove the option from the Broadcast Slide Show dialog box that allows users to add a new ...

This policy setting allows you to remove the option from the Broadcast Slide Show dialog box that allows users to add a new broadcast service as well as prevent all services previously added by users from appearing in the list of services.  

If you enable this policy setting, the Broadcast Slide Show dialog box will not provide an option for users to add a new broadcast service. In addition, all services previously added by users will not appear in the list of services.

If you disable or do not configure this policy setting, the Broadcast Slide Show dialog box will provide an option for users to add a new broadcast service, and the list of services previously added by users will appear in the list of services.