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     <a href="WS58a04a822e3e50102bd615109794195ff-7d39.html"><b>Validating signatures</b></a> 
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                        <h1>Set signature verification preferences</h1>
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                        <p>Before you open signed documents, set your
preferences to optimize Reader for validating
signatures.</p>

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<ol><li><span>Choose Edit &gt; Preferences (Windows) or Reader &gt; Preferences (Mac OS), and
select Security on the left.</span></li>
<li><span>To automatically validate all signatures in a PDF when
you open the document, select Verify Signatures When The Document
Is Opened. This option is enabled by default. </span></li>
<li><span>Click Advanced Preferences, and then click the Verification
tab.</span></li>
<li><span>Choose the following options:</span>
<table border="0" cellpadding="0" cellspacing="0"><table>
<thead><tr><th id="d16e7808-option" valign="bottom" align="left">Option</th>
<th id="d16e7808-desc" valign="bottom" align="left">Description</th></tr></thead>
<tbody><tr><td valign="top" headers="d16e7808-option" id="d16e7810"><strong>When Verifying</strong></td>
<td valign="top" headers="d16e7808-desc d16e7810">
                                    <p>These options specify methods that determine which plug-in to
choose when verifying a signature. The appropriate plug-in is often
selected automatically. Contact your system administrator about
specific plug-in requirements for validating signatures. </p>

                                 </td>
</tr>
<tr><td valign="top" headers="d16e7808-option" id="d16e7818"><strong>Require That Certificate Revocation Checking Be
Done Whenever Possible During Signature Verification</strong></td>
<td valign="top" headers="d16e7808-desc d16e7818">
                                    <p>Select this option to require certificates to be checked
against a list of excluded certificates during validation. If this
option isn’t selected, the revocation status for approval signatures
is ignored. The revocation status is always checked for certifying
signatures.</p>

                                 </td>
</tr>
<tr><td valign="top" headers="d16e7808-option" id="d16e7826"><strong>Verify Signatures Using</strong></td>
<td valign="top" headers="d16e7808-desc d16e7826">
                                    <p>Select an option to determine whether the time that appears
in the digital signature reflects the time the signature was validated (Current
Time), the time set by the default time stamp server specified in
the Security Settings, or the time the signature was created.</p>

                                 </td>
</tr>
<tr><td valign="top" headers="d16e7808-option" id="d16e7834"><strong>Hide Signature Field Validity Icon When Signature
Is Valid</strong></td>
<td valign="top" headers="d16e7808-desc d16e7834">
                                    <p>Hides the signature status if the signature is valid,
even if the document has changed since it’s been signed (indicated
by a green check mark and caution triangle icon). </p>

                                 </td>
</tr>
</tbody></table></table>
</li>
<li><span>Click the Windows Integration tab, and specify whether
you can import identities from the Windows Certificates feature
into the list of trusted identities. In addition, specify whether
to trust all root certificates in the Windows Certificates feature
when validating signatures and when validating certified documents.
Be aware that selecting these options might compromise security.</span></li>
</ol>
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