Adobe ACROBAT 3D, Manual, Page: 321 / 822

Signing Adobe PDF documents
An author of a PDF document can simply add a signature to indicate approval. Alternatively, a
PDF document can be signed more than once and by more than one person. For example, the
author can save a PDF document containing form fields as a certified document, allowing only
form fields to be filled in. When another user opens the PDF document, a message indicates
whether the certification is still valid. This user can then fill out the form and sign the document
when finished.
You can sign a document in an existing field, create a new field, or create a signature that
appears only in the Signatures tab. The signature that appears is just its representation on the
page and is not the actual digital signature information. The Signatures tab indicates which
changes have been made since each signature was added, and whether the signatures are valid.
(See
Validating signatures .)
Signature formats A. Text signature B. Graphic signature
Note: If you sign a field, be aware that the document author may have put duplicates of the field
on other pages. For example, sometimes a field is copied to the same place on every page. You
need to sign the field only once, and your signature appears in all occurrences of the field. This
duplication allows quick initialing of every page in a document.
Related Subtopics:
Signing Adobe PDF documents in Acrobat
Signing Adobe PDF documents in a web browser
Changing signature appearance
Setting up Palm OS appearance files
Clearing or removing digital signatures