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This mode enables you to store PDF files with a digital signature.

The following digital signatures can be used on this machine.

• Device Signature

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

• User Signature

This mode uses information about the user currently logged in to the machine using an SSO-H login service and the user signature certificate and key pair inside the machine to add a digital signature to the file, which enables the recipient to verify which user signed it. The recipient can verify the user that signed the file, and whether the file has been changed after it was signed.

• Visible Signatures

This mode displays a visible signature on the PDF when it is viewed, which enables the recipient to easily see that the file has a digital signature. You can also check the detailed signature information from the Properties of the signature. In addition, you can decide the position of the visible signature displayed on the PDF file.

• You cannot add a digital signature if the following settings are already specified:

• If [Optimize PDF for Web] is set to 'On' and [Reader Extensions] is selected as the file format (See "Optimize PDF for Web.")

• If Digital Signature and Reader Extensions are both set on the PDF file, the changes made after the signature is stored on the generated PDF file.

• If you select to add both a device signature and user signature, the device signature is added before the user signature.

• If a PDF file that has multiple signatures added to it is verified using software such as Adobe Reader/Adobe Acrobat, only the last signature added to the file is valid. The other signatures cause the file to be handled as if it has been altered by adding another signature.

• 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 recipient side, see the documentation for the software that supports the PDF format (such as Adobe Reader/Adobe Acrobat).

• As an example, the procedure for scanning an original and storing it in the Advanced Box is explained in this section.

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