为了保证文件的安全性，我们通常都希望对自己的PDF文件进行加密，所以，文件加密功能是非常实用的。下面，慧都控件网就和大家一起来分享Aspose.Cells执行PDF文件加密操作的事例代码，供大家参考：

[C#]

 //Open an Excel file
Workbook workbook = new Workbook("e:\\test\\book1.xls");

//Instantiate PDFSaveOptions to manage security attributes
PdfSaveOptions saveOption = new PdfSaveOptions();

saveOption.SecurityOptions = new Aspose.Cells.Rendering.PdfSecurity.PdfSecurityOptions();
//Set the user password
saveOption.SecurityOptions.UserPassword = "user";

//Set the owner password
saveOption.SecurityOptions.OwnerPassword = "owner";

//Disable extracting content permission
saveOption.SecurityOptions.ExtractContentPermission = false;

//Disable print permission
saveOption.SecurityOptions.PrintPermission = false;

//Save the PDF document with encrypted settings
workbook.Save("e:\\test\\securepdf_test.pdf", saveOption);

[VB]

 'Open an Excel file
Dim workbook As New Workbook("e:\test\book1.xls")

'Instantiate PDFSaveOptions to manage security attributes
Dim saveOption As New PdfSaveOptions()

saveOption.SecurityOptions = New Aspose.Cells.Rendering.PdfSecurity.PdfSecurityOptions()
'Set the user password
saveOption.SecurityOptions.UserPassword = "user"

'Set the owner password
saveOption.SecurityOptions.OwnerPassword = "owner"

'Disable extracting content permission
saveOption.SecurityOptions.ExtractContentPermission = False

'Disable print permission
saveOption.SecurityOptions.PrintPermission = False

'Save the PDF document with encrypted settings
workbook.Save("e:\test\securepdf_test.pdf", saveOption)