using System;
using System.IO;

using iTextSharp.text;
using iTextSharp.text.pdf;

public class Chap0109 {
    
	public static void Main() {
		Console.WriteLine("Chapter 1 example 9: encryption 40 bits");
        
		Document document = new Document(PageSize.A4, 50, 50, 50, 50);
		try {
			PdfWriter writer = PdfWriter.getInstance(document, new FileStream("Chap0109.pdf", FileMode.Create));
			writer.setEncryption(PdfWriter.STRENGTH40BITS, null, null, PdfWriter.AllowCopy);
			document.Open();
			document.Add(new Paragraph("This document is Top Secret!"));
			document.Close();
		}
		catch (Exception de) {
			Console.WriteLine(de.StackTrace);
		}
	}
}