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Setting Trust Manager preferences
Use the Trust Manager panel of the Preferences dialog box to change multimedia security 
settings for trusted and nontrusted documents. For example, you can allow multimedia 
files to be played in trusted documents and disallow them to be played in nontrusted 
documents.
A document is trusted if it's added to the list of trusted documents and authors. If a 
document is not trusted, you are prompted to add the document to this list when you try to 
play a media clip in which the permission is set to Prompt. If you decide to add a certified 
document to the list, both the document and the author's certificate are added to the list. 
All documents certified by this author are trusted.
To set Trust Manager preferences:
1.  Choose Edit > Preferences (Windows) or Adobe Reader > Preferences (Mac OS), and 
then select Trust Manager on the left. 
2.  From the Display Permissions For menu, choose whether you want to display security 
permissions for trusted documents or nontrusted documents.
3.  Select whether the trusted documents (or nontrusted documents) can open other files or 
launch applications.
4.  Under Multimedia Permission Settings, select Allow Multimedia Operations to allow 
media clips to be played. 
5.  To change the permission settings for a particular multimedia player, select the player in 
the list, and choose one of the following options from the Change Permission For Select 
Multimedia Player To menu:
●     
Always to allow the player to be used without prompting.
●     
Never to prevent the player from being used.
●     
Prompt to ask whether the player can be used. This option lets you decide whether to add 
a nontrusted document to the list of trusted documents when you try to play the media clip 
using the selected player.
6.  To set the media playback options, select any of the following options:
●     
Allow Playback In A Floating Window With No Title Bars.
●     
Allow Document To Set Title Text In A Floating-playback Window.
●     
Allow Playback In Full-screen window.
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