Delete PDF text from a given region.

Q: I just saw your post regarting PDF text editing (changing some
style properties) -

Can I use the same approach to delete PDF text from a given region.
For example:

byte[] cdata = new byte[1];
element.SetTextData(cdata, 1);

A: You could use the same apprach however please keep in mind that
full-blown and proper PDF redaction is much more difficult. As part of
the next PDFNet update we are planning to include a new add-on
(pdftron.PDF.Redactor) that will provide simple to use interface for
PDF redaction. The current version (v5.5) of PDFNet already comes with
the preview API which can be used the as follows:

using System;
using System.IO;
using System.Collections;

using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

namespace PDFNetSamples
  class PDFRedactionSample
        static void Redact(string input, string output, ArrayList
      using (PDFDoc doc = new PDFDoc(input))
        Redactor.Redact(doc, rarr);
        doc.Save(output, SDFDoc.SaveOptions.e_linearized);

    /// <summary>
    /// The following sample illustrates how to redact a PDF document
using 'pdftron.PDF.Redactor'.
    /// </summary>
    static void Main(string[] args)

      string input_path = "../../../../TestFiles/";
      string output_path = "../../../../TestFiles/Output/";
                ArrayList rarr = new ArrayList();
                rarr.Add(new Redactor.Redaction(1, new Rect(0, 0, 600,
600), false, "Top Secret"));
                rarr.Add(new Redactor.Redaction(2, new Rect(0, 0, 100,
100), false, "foo"));
                rarr.Add(new Redactor.Redaction(2, new Rect(100, 100,
200, 200), false, "bar"));
                rarr.Add(new Redactor.Redaction(2, new Rect(300, 300,
400, 400), false, ""));
                rarr.Add(new Redactor.Redaction(2, new Rect(500, 500,
600, 600), false, ""));
                rarr.Add(new Redactor.Redaction(3, new Rect(0, 0, 700,
20), false, ""));

        Redact(input_path + "newsletter.pdf", output_path +
"redacted.pdf", rarr);
      catch (PDFNetException e)