Protect PDF via C#

Set document privileges for PDF with AES-128 encryption. Use Aspose.PDF for .NET to modify PDF documents programmatically

Aspose.PDF for .NET Logo
C# Java C++ Python

How to Protect PDF File Using Using .NET Tool

In order to protect PDF file, we’ll use Aspose.PDF for .NET API which is a feature-rich, powerful and easy to use document manipulation API for net platform. Open NuGet package manager, search for Aspose.PDF and install. You may also use the following command from the Package Manager Console.

Package Manager Console

PM > Install-Package Aspose.PDF

Protect PDF via C#

You need Aspose.PDF for .NET to try the code in your environment.

  1. Load the PDF with an instance of Document.
  2. Create an object of DocumentPrivilege & set options.
  3. Call Document.Encrypt method to protect PDF with AES-128.
  4. Save result in PDF format

Protect PDF - C#

This sample code shows how to protect PDF File


using (var document = new Aspose.Pdf.Document("template.pdf"))
{
    // instantiate DocumentPrivileges object
    // apply restrictions on all privileges
    var documentPrivilege = Aspose.Pdf.Facades.DocumentPrivilege.ForbidAll;
    // allow screen reading
    documentPrivilege.AllowScreenReaders = true;
    // encrypt the file with User and Owner password.
    document.Encrypt("userpassword", "ownerpassword", documentPrivilege, Aspose.Pdf.CryptoAlgorithm.AESx128, false);
    // save updated document
    document.Save("protected.pdf");
}