Sarah Wang

Hi,
I know how to disable permissions for the pdf existed in the local hard drive, but I use the same method to output the pdf in IE, and there is only a blank page with no exception. If any one know what's the problem? If there is any comments, I appreciate it. Thanks a lot!

private void hideMenu(InputStream is, OutputStream os) throws IOException { Rectangle rec = null; int page = 0; Document document = new Document(); try { com.lowagie.text.pdf.PdfReader reader = new com.lowagie.text.pdf.PdfReader(is); PdfWriter writer = PdfWriter.getInstance(document, os); // program stopped here, but no exception was thrown out [color=red]writer.setEncryption(null, null, ~PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);[/color] document.open(); PdfContentByte cb = writer.getDirectContent(); page = reader.getNumberOfPages(); int i = 0; while (i < page) { rec = reader.getPageSize(i+1); document.setPageSize(new Rectangle(rec.getWidth(), rec.getHeight())); document.newPage(); i++; PdfImportedPage pageToNew = writer.getImportedPage(reader, i); cb.addTemplate(pageToNew,0,0); } } catch (Exception de) { System.err.println(de.getMessage()); } document.close(); }

Hi,
I have completely the same question like yours, but I still couldn't find a way to resolve it. Here is the related artice link I searched in this site for your reference - it generates a encrypted pdf in the local drive and it works! But in my case, I have to make the pdf output in a popup browser instead of a real pdf in the local drive. When I applied to my code, what I got was an empty page. You can try that and maybe you can figure it out. And if you do, please share with me. Thanks.

the related artice link
https://coderanch.com/t/63399/open-source/generate-secure-restricted-pdf-IText

the API and Jar you will need as follows.
API of iText (javadoc format):
http://api.itextpdf.com/

Jar:
http://bouncycastle.org/latest_releases.html

sample code
package com.lowagie.examples.general; import java.io.FileOutputStream; import java.io.IOException; import com.lowagie.text.*; import com.lowagie.text.pdf.PdfWriter; /** * Generates an encrypted 'Hello World' PDF file. * * @author blowagie */ public class HelloEncrypted { /** * Generates a PDF file with the text 'Hello World' * that is protected with the password 'Hello'. * * @param args no arguments needed here */ public static void main(String[] args) { System.out.println("Hello World Encrypted"); // step 1: creation of a document-object Document document = new Document(); try { // step 2: // we create a writer that listens to the document // and directs a PDF-stream to a file PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("HelloEncrypted.pdf")); writer.setEncryption(null, null, ~(PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING | PdfWriter.ALLOW_SCREENREADERS), PdfWriter.ENCRYPTION_AES_128); // step 3: we open the document document.open(); // step 4: we add a paragraph to the document document.add(new Paragraph("Hello World")); } catch (DocumentException de) { System.err.println(de.getMessage()); } catch (IOException ioe) { System.err.println(ioe.getMessage()); } // step 5: we close the document document.close(); } }