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- 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.
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- 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).
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