ITEXT protect the content from pdf

Question

Hi
All
I run this jsp it show me a pdf, but i got a problem i can edit that pdf and change the content, Is there one way to protect it ?
How ?
Thanks
<%@
page import="java.io.*,
                com.lowagie.text.*,
                com.lowagie.text.pdf.*,
              java.awt.Color,
               java.net.MalformedURLException,
             java.net.URL,
                com.lowagie.text.*,
                com.lowagie.text.pdf.*,
                java.io.FileOutputStream,
                com.lowagie.text.pdf.PdfWriter,
                com.lowagie.text.rtf.RtfWriter2,
                com.lowagie.text.pdf.codec.TiffImage,
                com.lowagie.text.pdf.codec.GifImage,
                com.lowagie.text.Image"
%><%               
%><%
          // Template JSP file for iText
          // by Tal Liron
          response.setContentType( "application/pdf" );
          // step 1: creation of a document-object
          Document document = new Document();
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        PdfWriter writer = PdfWriter.getInstance( document, buffer );
         document.open();
         //Configurar saida como array buffer
         //Configurar criptografia do conteudo em 128 bits
        PdfContentByte cb = writer.getDirectContent();
        PdfContentByte cb2 = writer.getDirectContent();
       //Tipo de Fonte
        BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED );
        cb.stroke();
        cb.setColorFill(Color.blue);
            cb.stroke();
            cb.beginText();
            cb.setFontAndSize(bf, 12);
            cb.setColorFill(Color.darkGray);                       
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 140, 591, 0);
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 140, 577, 0);           
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 240, 562, 0);           
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 140, 548, 0);  
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 140, 532, 0);
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 140, 517, 0);
            cb.showTextAligned(PdfContentByte.ALIGN_LEFT, "text 1", 208, 502, 0);
            cb.endText();
          document.close();
          DataOutput output = new DataOutputStream( response.getOutputStream() );
          byte[] bytes = buffer.toByteArray();
          response.setContentLength(bytes.length);
          for( int i = 0; i < bytes.length; i++ ) { output.writeByte( bytes[i] ); }
%>Edited by: silvaneto on Jun 26, 2009 8:03 AM

Answer 1

Here's the Bullet.fx file
import java.lang.Math;
import javafx.scene.CustomNode;
import javafx.scene.Node;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
public class Bullet extends CustomNode {
    def GRAVITY : Number = 0.0002;
    def WALL_HARDNESS = .90;
    public var x : Number;
    public var y : Number;
    public var radius : Number = 5;
    public var color : Color = Color.RED;
    public var velocity_x : Number;
    public var velocity_y : Number;
    var offScreen: Boolean = false;
    public function collide( invader : Invader ): Boolean {
        var dx : Number = invader.x - x;
        var dy : Number = invader.y - y;
        var distance : Number = Math.sqrt( dx * dx + dy * dy );
        var minDist : Number = invader.radius + radius;
        return ( distance < minDist )
    public function move( delta_time: Number, width : Number, height : Number ): Boolean {
        velocity_y += GRAVITY * delta_time;
        y += velocity_y * delta_time;
        x += velocity_x * delta_time;
        if( x + radius > width ) {
            offScreen = true;
        } else
        if( x - radius < 0 ) {
            offScreen = true;
        if( y + radius > height ) {
            offScreen = true;
        } else
        if( y - radius < 0 ) {
            offScreen = true;
        return offScreen;
    public override function create(): Node {
        return Circle {
            centerX: bind x,
            centerY: bind y,
            radius: bind radius
            fill: bind color
}