How to: Protect a PDF Document with a Password

• Mar 20, 2020
• 2 minutes to read

Important

You need a license to the DevExpress Office File API or DevExpress Universal Subscription to use these examples in production code. Refer to the DevExpress Subscription page for pricing information.

This example shows how a PDF document can be protected using both the owner and user passwords.

Refer to the following topic fro more information: Document Protection

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-protect-a-pdf-document-with-a-password-t243764

Program.cs

using DevExpress.Pdf;

namespace PDFPasswordProtection
{
  class Program
  {
    static void Main(string[] args)
    {

      using (PdfDocumentProcessor pdfDocumentProcessor = new PdfDocumentProcessor()) {

        // Load a PDF document.
        pdfDocumentProcessor.LoadDocument("..\\..\\Demo.pdf");

        // Specify printing, data extraction, modification, and interactivity permissions. 
        PdfEncryptionOptions encryptionOptions = new PdfEncryptionOptions();
        encryptionOptions.PrintingPermissions = PdfDocumentPrintingPermissions.Allowed;
        encryptionOptions.DataExtractionPermissions = PdfDocumentDataExtractionPermissions.NotAllowed;
        encryptionOptions.ModificationPermissions = PdfDocumentModificationPermissions.DocumentAssembling;
        encryptionOptions.InteractivityPermissions = PdfDocumentInteractivityPermissions.Allowed;

        // Specify the owner and user passwords for the document.  
        encryptionOptions.OwnerPasswordString = "OwnerPassword";
        encryptionOptions.UserPasswordString = "UserPassword";

        // Specify the 256-bit AES encryption algorithm.
         encryptionOptions.Algorithm = PdfEncryptionAlgorithm.AES256;

        // Save the protected document with encryption settings.  
        pdfDocumentProcessor.SaveDocument("..\\..\\ProtectedDocument.pdf", new PdfSaveOptions() { EncryptionOptions = encryptionOptions });
        }
    }
  }
}

Program.vb

Imports DevExpress.Pdf

Namespace PDFPasswordProtection
    Friend Class Program
        Shared Sub Main(ByVal args() As String)

        Using pdfDocumentProcessor As New PdfDocumentProcessor()

            ' Load a PDF document.
            pdfDocumentProcessor.LoadDocument("..\..\Demo.pdf")

            ' Specify printing, data extraction, modification, and interactivity permissions. 
            Dim encryptionOptions As New PdfEncryptionOptions()
            encryptionOptions.PrintingPermissions = PdfDocumentPrintingPermissions.Allowed
            encryptionOptions.DataExtractionPermissions = PdfDocumentDataExtractionPermissions.NotAllowed
            encryptionOptions.ModificationPermissions = PdfDocumentModificationPermissions.DocumentAssembling
            encryptionOptions.InteractivityPermissions = PdfDocumentInteractivityPermissions.Allowed

            ' Specify the owner and user passwords for the document.  
            encryptionOptions.OwnerPasswordString = "OwnerPassword"
            encryptionOptions.UserPasswordString = "UserPassword"

            ' Specify the 256-bit AES encryption algorithm.
            encryptionOptions.Algorithm = PdfEncryptionAlgorithm.AES256

            ' Save the protected document with encryption settings.  
            pdfDocumentProcessor.SaveDocument("..\..\ProtectedDocument.pdf", New PdfSaveOptions() With {.EncryptionOptions = encryptionOptions})
        End Using
        End Sub
    End Class
End Namespace