iTEXT não deixar editar o conteudo do pdf

Olá
Tenho esse jsp com com api itext gerando um pdf porem ele deixa alterar o conteudo, teria como bloquear a edição do pdf?
Como faço isso?
Grato
<%@
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] ); }
%>
Topicos relacionados
