Add Password Protection to PDF using java

Add Password Protection to PDF using Java

 //Please include following jars
//itextpdf-5.2.1.jar
//bcmail-jdk16-1.46.jar
//bcprov-jdk16-1.46.jar
//bctsp-jdk16-1.46.jar
//-------------------------------------
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Date;

import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;

public class GeneratePDF {

 public static void main(String[] args) {
  try {
   System.out.println("--Process started--");
   String usrPwd = "hello";
   String authorPwd = "hello123";
   OutputStream file = new FileOutputStream(new File(
     "c:\\prd\\Test_pdf_file.pdf"));

   Document document = new Document();
   PdfWriter writer = PdfWriter.getInstance(document, file);

   writer.setEncryption(usrPwd.getBytes(), authorPwd.getBytes(),
     PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

   document.open();
   document.add(new Paragraph("Hello World, iText"));
   document.add(new Paragraph(new Date().toString()));

   document.close();
   file.close();
   System.out.println("--Process ended--");

  } catch (Exception e) {

   e.printStackTrace();
  }
 }
}