Sheet1 Adds Digital signature to a already signed OOXML spreadsheet file (Excel2007 and later). 2017-08-26T10:28:28Z 16.0300 2015-06-05T18:17:20Z 2017-08-26T10:28:28Z 2017-08-26T10:28:28Z 2017-08-2......Sheet1 Adds digital signature to a already signed OOXML spreadsheet...