Your network contains a server named Server1 that runs Windows Server 2008 R2.
Server1 has the Streaming Media Services role and the Web Server (IIS) role installed.
Server1 has a broadcast publishing point named Broadcast1.
Broadcast1 publishes a file named Broadcast1.wmv.
You run the Unicast Announcement Wizard for Broadcast1 and create a new announcement file.
You need to ensure that only authorized users have permission to access the announcement file.
What should you modify?