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Digitally signing a PDF document
This chapter explains how you can sign PDF files and forms with your Entrust 
certificate.
Note: Procedures are based on the 9.0 versions of Adobe Reader and Adobe 
Acrobat Professional. While previous versions are similar, the procedures are not 
identical. For instructions involving older product versions, see the Adobe 
documentation.
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Managed Services PKI Using Entrust certificates with Adobe PDF files and 
forms
Document issue: 1.0
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Signing PDF files and forms
When a digital signature is added to a PDF file or form, recipients are able to verify 
who sent the document. 
Once signed, the document message bar includes one of the following:
a check mark indicating the signature is trusted
a question mark indicating the signature cannot be traced back to a trusted 
root or the certificate revocation list (CRL) cannot be found
If you configured your product for Windows integration as described in “To 
configure Adobe Acrobat Professional or Adobe Reader for Windows 
integration” on page 2, you should not see a question mark in the message 
bar for documents signed by individuals within your organization (those 
whose certificates were issued by your organization’s CA).
If you want to trust the signature of someone outside of your organization, 
you must add the signer to the trusted list. For more information, see 
“Adding a signer to the trusted list” on page 14.
a red X indicating the signature is invalid
In the procedure below, ensure the Tasks toolbar is visible in Adobe Acrobat.
Note: Adobe Reader does not allow signing unless rights are first enabled in the 
PDF by an Adobe Acrobat or LiveCycle user. By default, you can verify signatures 
and add certificates to the trust list (no intervention is first required).
To add a digital signature to a PDF document
1
From the tasks toolbar of Adobe Professional or Adobe Reader, click Sign and 
select Sign Document.
Note: A dialog box may appear describing how to apply the signature to your 
document. Read the instructions and click OK.
2
Depending on the PDF you are signing, do one of the following:
If the PDF already has a signature field, click the signature field.
If the PDF does not have a signature field, click and drag your cursor to create 
a signature field.
3
From the Sign Document dialog box, select your certificate from the Sign As 
drop-down list and click Sign.
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Digitally signing a PDF document
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Note: You can also view your certificate, change or create a new appearance for 
your digital signature, and lock your document after signing (PDF file only). For 
more information, see the Adobe documentation.
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If your organization created a specific format for the appearance of your digital 
signature, select the format name from the Appearance drop-down list. To 
configure the appearance yourself, see “Changing the appearance of your digital 
signature” on page 23.
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When prompted, save your signed PDF document and click Save. If you want to 
keep the original, unsigned version, save the PDF document under a new file 
name.
You successfully signed a PDF document.
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Managed Services PKI Using Entrust certificates with Adobe PDF files and 
forms
Document issue: 1.0
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A
Adobe and digital signatures
This appendix includes the following sections:
“Adding a signer to the trusted list” on page 14
“Manually verifying signatures on a case-by-case basis” on page 21
“Changing the appearance of your digital signature” on page 23
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Managed Services PKI Using Entrust certificates with Adobe PDF files and 
forms
Document issue: 1.0
Report any errors or omissions
Adding a signer to the trusted list
If you configured your Adobe product for Windows integration as described in “To 
configure Adobe Acrobat Professional or Adobe Reader for Windows integration” on 
page 2, Adobe automatically trusts all signatures associated with certificates issued by 
your company’s certification authority (CA). 
However, if you receive a PDF from someone you know and trust, but Adobe does 
not trust the signature because the associated certificate is not trusted, you can add 
the signer to the list of Adobe trusted identities. By doing this, all subsequent PDF 
documents you receive from that signer will be trusted.
To add a signature to the trusted list
1
Open the PDF document in Adobe Reader or Adobe Acrobat.
2
Click the Signature icon 
in the left pane.
3
Right-click the signature to trust.
A drop-down menu appears.
4
Select Validate Signature.
The Signature Validation Status dialog box appears.
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Adobe and digital signatures
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5
Click Signature Properties.
The Signature Properties dialog box appears.
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Managed Services PKI Using Entrust certificates with Adobe PDF files and 
forms
Document issue: 1.0
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6
Select the Summary tab and click Show Certificate.
The Certificate Viewer dialog box appears.
17
Adobe and digital signatures
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7
Click the Trust tab.
The Trust page appears.
18
Managed Services PKI Using Entrust certificates with Adobe PDF files and 
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8
Click Add to Trusted Identities.
A warning message appears.
9
Click OK on the warning message.
The Import Contact Settings dialog box appears.
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