Adding a Digital Signature to a PDF File to Save

You can add the following two type of digital signature to PDF data:


  • Device Signature

This mode uses the device signature certificate and key pair inside the machine to add a digital signature to the document, which enables other users to verify which device scanned it. Other users can verify the device that signed the document, and whether the document has been changed after it was signed.


Remark
  • You can only add a digital signature to documents saved in either the PDF, PDF (Trace), PDF (Compact), or PDF (OCR) file format. You cannot add a digital signature to documents saved in the TIFF or JPEG format.
  • If other users verify a PDF that has had multiple signatures added to it using software that supports the PDF format (such as Adobe Reader/Adobe Acrobat), only the last signature is enabled. The other signatures cause the document to be handled as if it has been altered.
  • If you change the file format to a format other than 'PDF' after setting to add a digital signature, a message confirming whether you want to change the file format is displayed. If you change the file format, the digital signatures you have set to add are canceled.
  • For information on validating certificates, registering certificates in the trusted certificates list, and verifying signatures on the other users' side, see the documentation for the software that supports the PDF format (such as for Adobe Reader/Adobe Acrobat).