This example loads a workbook named “mybook.wbk” and then tests to see whether its Visual Basic for Applications project has a digital signature. If there’s no digital signature, the example displays a warning message.
Workbooks.Open FileName:="c:\My Documents\mybook.wbk", _
ReadOnly:=False
If Workbook.VBASigned = False Then
MsgBox "Warning! The project " _
"has not been digitally signed." _
, vbCritical, "Digital Signature Warning"
End If