Other API Samples Workbook Encryption SpreadsheetGear API SampleWorkbook Saving Workbook EncryptionDescriptionSpreadsheetGear supports reading and writing encrypted workbooks with Agile Encryption used by Excel 2013 and later, including default SHA-512 encryption for workbooks.Sample Source Code// Create a new workbook and some local variables for convenience. SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook(); SpreadsheetGear.IWorksheet worksheet = workbook.Worksheets["Sheet1"]; SpreadsheetGear.IRange cells = worksheet.Cells; // Rename the worksheet. worksheet.Name = "My Worksheet"; // Add some cell data. cells["A1"].Value = "Hello World!"; // Save to Excel to Open XML (*.xlsx) file. workbook.SaveAs(@"c:\path\to\workbook.xlsx", SpreadsheetGear.FileFormat.OpenXMLWorkbook, "MyPassword1234");