Operation Manual

233
USING ACROBAT X STANDARD
Digital signatures
Last updated 10/11/2011
2 Choose Tools > Sign & Certify and then select one of the following options. If you don't see the Sign & Certify panel,
see the instructions for adding panels at
“Task panes” on page 8.
• With Visible Signature.
• Without Visible Signature. If you choose this option, your signature appears only in the Signatures panel.
3 Click OK in the Save As Certified Document dialog box.
If you are certifying with Visible signatures, you can place the signature in an existing signature field or create a field
for the signature. Follow the directions in the prompts to choose a location.
4 If you’re adding a visible signature, draw the signature field on the page.
Note: If you enabled View Documents In Preview Document Mode When Signing in the Security Preferences, click Sign
Document in the document message bar.
5 Follow the onscreen instructions to select a digital ID, if prompted.
Specify a default ID to avoid being prompted each time you sign a PDF.
6 In the Certify Document dialog box, specify the permitted changes, type your password or PIN for your digital ID,
and then click Sign.
Note: Some digital IDs are configured to ask for a password or other user authentication after you click the Sign button.
7 Save the PDF using a different filename than the original file, and then close the document without making
additional changes. It is a good idea to save it as a different file so that you can retain the original unsigned
document.
More Help topics
“Specify the default digital ID” on page 217
“About digital signatures” on page 222
Timestamp a document
Acrobat X provides users with the capability to add a document timestamp to a PDF without also requiring an identity-
based signature. In this way, the authenticity and existence of a document at a particular time can be asserted. These
timestamps are compliant with the timestamp and revocation features described in Part 4 of ETSI 102 778 PDF
Advanced Electronic Signatures (PAdES) standard. Reader X users can also timestamp a document if the document
includes appropriate Reader Enabling features.
For more information on PAdES, see blogs.adobe.com/security/2009/09/eliminating_the_penone_step_at.html
To place a document timestamp:
1 Open the document to which you want to add a timestamp.
2 Choose Tools > Sign & Certify > Time Stamp Document. If you don't see the Sign & Certify panel, see the
instructions for adding panels at
“Task panes” on page 8.
3 In the Choose Default Timestamp Server dialog box, select a default timestamp server from the list, or add a new
default timestamp server.
4 Click Next, and then save the document with the timestamp.