Change Password of PDF File

Change Password of a PDF File

In order to change password of a PDF file, you need to create PdfFileSecurity object and then call the ChangePassword method. You need to pass existing owner password and new user and owner passwords to the ChangePassword method.

The following code snippet shows you how to change passwords of a PDF file.

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ChangePassword()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_SecuritySignatures();

    using (var pdfFileInfo = new Aspose.Pdf.Facades.PdfFileInfo(dataDir + "sample_encrypted.pdf"))
    {
        // Create PdfFileSecurity object if the document is encrypted
        if (pdfFileInfo.IsEncrypted)    
        {
            using (var fileSecurity = new Aspose.Pdf.Facades.PdfFileSecurity())
            {
                // Bind PDF document
                fileSecurity.BindPdf(dataDir + "sample_encrypted.pdf");
                fileSecurity.ChangePassword("OwnerP@ssw0rd", "Pa$$w0rd1", "Pa$$w0rd2", Aspose.Pdf.Facades.DocumentPrivilege.Print, Aspose.Pdf.Facades.KeySize.x256);
                // Save PDF document
                fileSecurity.Save(dataDir + "sample_encrtypted1.pdf");
            }
        }
    }
}