Hi there,
I need to find the bit of code that will enable the ability for
combining PDF files, but won't allow users to modify the contents of the
files. From the code below, I added "PdfWriter.AllowAssembly" which
changes the Document Security for "Document Assmebly" = Allowed. I
created two PDFs with this setting (Allow Printing and Assembly) but as
soon as I open one of the PDFs, and click "Insert", a dialog prompts me
for a password. Is there a way to enable this functionality without
triggering a password protection??? I noticed that before I added
"PdfWriter.AllowAssembly", I was able to print the PDF without
triggering the password protection, even though from the java API, it
says:
AllowPrinting
<http://www.jdocs.com/itext/1.02/api/com/lowagie/text/pdf/PdfWriter.html
#AllowPrinting>
The operation permitted when the document is opened with the
user password
Why is it different for "AllowAssembly"???
Also, if I don't encrypt the file at all, I can combine PDFs with no
problem. Is this a "all or nothing" situation?? Is there a way to
encrypt a file but allow Document Assembly without triggering the
password protection?
Thanks,
Katherine Tung
import java.io.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
public class Encrypt extends java.lang.Object {
/**
* @param args the command line arguments
*/
public static void main (String args[]) {
if (args.length != 3) {
System.err.println("This tools needs 3 parameters:\njava
Encrypt srcfile destfile password");
}
else {
try {
// we create a reader for a certain document
PdfReader reader = new PdfReader(args[0]);
// we retrieve the total number of pages
int n = reader.getNumberOfPages();
System.out.println("There are " + n + " pages in the
original file.");
// step 1: creation of a document-object
Document document = new
Document(reader.getPageSizeWithRotation(1));
// step 2: we create a writer that listens to the
document
PdfWriter writer = PdfWriter.getInstance(document, new
FileOutputStream(args[1]));
writer.setEncryption(PdfWriter.STRENGTH128BITS, args[2],
null, PdfWriter.AllowPrinting | PdfWriter.AllowAssembly);
// step 3: we open the document
document.open();
PdfContentByte cb = writer.getDirectContent();
PdfImportedPage page;
int rotation;
int i = 0;
// step 4: we add content
while (i < n) {
i++;
document.setPageSize(reader.getPageSizeWithRotation(i));
document.newPage();
page = writer.getImportedPage(reader, i);
rotation = reader.getPageRotation(i);
if (rotation == 90 || rotation == 270) {
cb.addTemplate(page, 0, -1f, 1f, 0, 0,
reader.getPageSizeWithRotation(i).height());
}
else {
cb.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
System.out.println("Processed page " + i);
}
// step 5: we close the document
document.close();
}
catch(Exception e) {
System.err.println(e.getClass().getName() + ": " +
e.getMessage());
}
}
}
}
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