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_Workbook.Signatures Property

Returns the digital signatures for a workbook. Read-only.

Namespace:  Microsoft.Office.Interop.Excel
Assembly:  Microsoft.Office.Interop.Excel (in Microsoft.Office.Interop.Excel.dll)

SignatureSet Signatures { get; }

To digitally sign Excel2007 workbooks and verify other signatures in them, you will need the Microsoft CryptoAPI and a unique digital signature certificate. The CryptoAPI is installed with Microsoft Internet Explorer 4.01 or later. You can obtain a digital signature certificate from a certification authority.