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                        <h1>Restrict URLs and attachments in PDFs</h1>
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                        <p>
                           Reader warns
you any time you try to open a URL (web link) or a file attachment
that uses a disallowed file type. URLs and disallowed file types
(for example, EXE) are potentially dangerous because they can transfer
or run programs, macros, or viruses that can damage your computer. </p>

                        <p>You
can allow Reader to contact specific
websites by adding those URLs to your list of allowed websites in
the Trust Manager preferences. Remove any URLs you no longer want
to visit. To open file attachments in Reader,
you must respond to a prompt by indicating that you always allow
files of that type. The attachment’s file type is then added to
a list stored in the registry. If you want to restrict a file type
that you permitted in the past, you can reset this list to its default
settings in the Trust Manager preferences. </p>

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<h3 class="topictitle3"><a xmlns:adobe="http://www.adobe.com/saxon" href="#WS143C83B9-D6A8-49bd-90A7-26ECEB7B0D4A" onclick="javascript:toggleLayer('WS143C83B9-D6A8-49bd-90A7-26ECEB7B0D4A');return false;" title="Trust Manager preferences"><img src="images/off.gif" />Trust Manager preferences</a></h3><div xmlns:adobe="http://www.adobe.com/saxon" id="WS143C83B9-D6A8-49bd-90A7-26ECEB7B0D4A" class="mini"><a name="WS143C83B9-D6A8-49bd-90A7-26ECEB7B0D4A"><!-- --></a><div>
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                           <p>To open the Trust Manager preferences,
choose Edit &gt; Preferences (Windows) or Reader &gt;
Preferences (Mac OS), and select Trust Manager on the left.</p>

                           <dl><dt class="dlterm">Allow Opening Of Non-PDF File Attachments With External
Applications</dt>
<dd>
                                    <p>When selected, allows file attachments to start external
applications when you open the files. You must have the external
applications to open the files.</p>

                                 </dd><br /><dt class="dlterm">Restore Default List Of Allowed And Disallowed File
Attachment Types</dt>
<dd>
                                    <p> Removes saved settings you chose for opening attachments.
For example, if you chose to always open TMP attachments when prompted,
TMP appears on the list of allowed file attachment types. By clicking
Restore, you remove TMP from the list. </p>

                                 </dd><br /><dt class="dlterm">Change Settings</dt>
<dd>
                                    <p>When clicked, lets you specify the default behavior for accessing
the Internet from PDFs. To restrict access to only the URLs you
specify, select Let Me Specify A List Of Allowed And Blocked Web
Sites (the default). To allow access to all URLs, select Allow All
Web Sites. To restrict access with all URLs in PDFs, select Block
All Web Sites. </p>

                                    <p>To specify a list of allowed and blocked websites,
type each URL in the text box, and click Allow or Block. Then specify
the default behavior for Reader for
websites that aren’t in the list.</p>

                                    <div class="p">
                                       <div class="note"><span class="notetitle">Note:  </span>If you open a protected
PDF and a security warning dialog box prompts you to allow or block
a URL, select Remember My Action For This Site, and the URL is added to
this list.</div>

                                    </div>

                                 </dd><br /><dt class="dlterm">Allow External Content</dt>
<dd>
                                    <p>Allows Reader to read data from
stream objects in a PDF. Stream objects are URLs or file specifications
identified by flags, as specified in <em>PDF Reference Version Fifth
Edition: Adobe Portable Document Format Version 1.6</em>. Use this
option if you’re a PDF developer who creates PDF files that contain
streams, or if you work with these types of files. </p>

                                 </dd><br /></dl>

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