Excel 2010 - Multiple Digital Signatures?

How would you add multiple digital signatures to an Excel 2010 workbook?

Hi,
To add multiple digital signatures, we need to  create the signatures first.
Then please refer to the following steps:
Click the File tab.
Click Info.
Under Permissions, click Protect Document,
Protect Workbook or Protect Presentation.
Click Add a Digital Signature.
Read the Word, Excel, or PowerPoint message, and then click OK.
In the Sign dialog box, in the Purpose for signing this document box, type the purpose.
Click Sign.
 Check the following MS link for additional information.
http://office.microsoft.com/en-us/excel-help/add-or-remove-a-digital-signature-in-office-files-HA010354308.aspx
Regards,
George Zhao
TechNet Community Support

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