How can I encrypt a PDF using 128-bit strength?

The following sample shows how to use 128-bit strength to encrypt a PDF. Make sure that the option for setting PDF key length is used with an option for setting PDF password.

You can download the tool by clicking VeryPDFToobox.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Call_PDFToolBoxCom
    class Program
        static void Main(string[] args)
           string strExePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
           PDFToolBoxCom.PDFToolBoxCom p = new PDFToolBoxCom.PDFToolBoxCom();
           string strReturn = p.RunCMD(strExePath + @"\1.pdf -outfile "+ strExePath + @"\1.128.pdf  -ownerpassword foopass");
           Console.WriteLine("Please enter any key to continue...");

Lear more: VeryPDF PDF Toolbox Component for .NET.

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