User guide

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Digital signatures
A digital signature is much more powerful than a traditional paper-based signature. They provide you
with a way to show a person signed a particular document at a particular time and helps to ensure that
the document content has not been tampered with after it was signed. Additionally, the document
version history shows recipients when a document was signed, and when changes were made. This
revision history is encrypted and stored inside the PDF, and can be viewed in the Signatures pane.
To digitally sign a PDF document, you need a digital ID. To verify the signature of another person, you
must first share your digital IDs and add each other to your Trusted Contacts list.
For more information about digital signatures, see:
l Digitally sign a document
l View and validate certificates and signatures
l Certify PDF files
l Digital signature timestamp
For related information, see:
l Create signature fields
l Digital IDs
l Manage Digital IDs
l Manage trusted contacts
Nitro Pro 9 - User Guide