ExcelDocumentSecurity Properties

Gets or sets the password that must be supplied to open the workbook when opening a workbook or to password protect the workbook when saving a workbook. Password protection works only with Excel 2003 .xls format. To remove password protection for an existing workbook a valid open password must be supplied when opening the workbook and then the OpenPassword property must be set to null before saving the workbook to prevent protecting again the saved document.

Sets the write password of a workbook. This password is required in order to edit the workbook. Password protection works only with Excel 2003 .xls format.