Adobe Acrobat 8 3D - Manual (Page 289)

282 ADOBE ACROBAT 3D VERSION 8
User Guide
Note: If you enabled View Documents In Preview Document Mode When Signing in the Security Preferences, click Sign
Document in the document message bar.
3 Click OK in the Save As Certified Document dialog box.
4 If you’re adding a visible signature, draw the signature field on the page. Follow the on-screen instructions to select
a digital ID, if prompted.
Specify a default ID to avoid being prompted each time you sign a PDF.
5 In the Certify Document dialog box, specify the permitted changes, type your password, and then click Sign.
6 Save the PDF using a different filename than the original file, and then close the document without making
additional changes.
See also
“Change the signing method” on page 256
“Specify the default digital ID” on page 256
“About digital IDs” on page 253
Clear or remove a digital signature
❖ Do one of the following:
• To remove a signature, right-click/Control-click the signature field and choose Clear Signature Field.
• To remove all signatures in a PDF, choose Clear All Signature Fields from the Options menu in the Signatures
panel.
If you want to delete the signature field, choose Tools > Advanced Editing > Select Object Tool, select the signature
field, and press the Delete key.
Validating signatures
Checking the validity of a signature
By default, signatures are validated when you open a PDF. An icon appears in the signature field on the document
page to indicate the signature status. Further details about the status appear in the Signatures panel and in the
Signature Properties dialog box.
Third-party signature handlers may provide alternate methods of validating signatures. Check the documentation
included with your third-party digital ID.
Important: To ensure that signatures are validated when you open a PDF and that all verification details appear with
the signature, set your verification preferences in advance (see “Set signature verification preferences” on page 284).
• The digital signature icon along with the name of the field in the Signatures panel indicate the presence
of an unsigned signature field.
• The blue ribbon icon indicates that the PDF is certified—that is, it contains a valid certifying signature. (Certi­
fying signatures can be visible or invisible.)
• The check mark icon indicates that the signature is valid.