Adobe Acrobat 9 PRO Extended - Manual (Page 268)

262 USING ACROBAT 9 PRO EXTENDED
Digital signatures
Last updated 9/30/2011
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“ Enable right-to-left languages ” on page 57
Set signing preferences
1 Open the Preferences dialog box, and then select Security on the left.
2 Click Advanced Preferences, and then click the Creation tab.
3 (Optional) If you are planning to use a third party plug-in as your default signing method, make sure it is installed.
Choose the default method for signing documents.
4 Select any of the following:
Include Signature’s Revocation Status When Signing Embeds information about whether your certificate is valid or
has been revoked (required for signature validation). This option speeds the validation process by not having to go
online to determine whether the certificate has been revoked. This option is selected by default.
Show Reasons When Signing Adds your reason for signing to the signature field. When you sign a PDF, a menu
appears in the Sign Document dialog box. From this menu, you can select the option that best describes your reason
for signing the PDF.
Show Location And Contact Information When Signing Adds your location information to the signature field. Contact
information appears in the Signer tab of the Signature Properties dialog box. When you sign a PDF, text boxes appear
in the Sign Document dialog box where you can type this information.
Enable Reviewing Of Document Warnings Analyzes documents in a signing workflow for content that can change the
document appearance. It then provides an option in the Sign Document dialog box to review this content. Specify
Always, Never, or When Certifying A Document. Available options depend on the Prevent Signing Until Document
Warnings Are Reviewed setting.
Prevent Signing Until Document Warnings Are Reviewed Enable this option to require the signer to review document
warnings before signing or certifying a document. Specify Always, Never, or When Certifying A Document.
Add a timestamp to signatures
You can include the date and time you signed the document as part of your signature. Timestamps are easier to verify
when they’re associated with a timestamp authority’s trusted certificate. Including a timestamp helps to establish
exactly when you signed the document and reduces the chances of an invalid signature. You can obtain a timestamp
from a third-party timestamp authority or from the certificate authority that issued your digital ID.
Timestamps appear in the signature field and in the Signature Properties dialog box. If a timestamp server is
configured, that timestamp appears in the Date/Time tab of the Signature Properties dialog box. If no timestamp server
is configured, the signatures field displays the local time of the computer at the moment of signing.
Note: If you did not embed a timestamp when you signed the document, you can add one later to your signature. (See
“
Establish long-term signature validation ” on page 269.) A timestamp applied after signing a document uses the time
provided by the timestamp server.
Configure a timestamp server
To configure a timestamp server, you need the server name and URL, a Forms Data Format (FDF) file that contains
the server settings, or a security settings file that contains the timestamp server information.