code: protected PdfStream copyStream(PRStream in) throws IOException, BadPdfFormatException {
          PRStream out = new PRStream(in, null);
          
          for (Iterator it = in.getKeys().iterator(); it.hasNext();) {
              PdfName key = (PdfName) it.next();
              PdfObject value = in.get(key);
              out.put(key, copyObject(value));
          }
          
          return out;
      }
docs: Translate a PRStream to a PdfStream. The data part copies itself.