title: pdftk - fill_form leads to "This document contained certain rights" dialog?
body: <p>I'm using <a href="http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/" rel="nofollow">pdftk</a> and the <strong>fill_form</strong> command to fill in a PDF form from FDF data.</p>
  
  <p>When I execute the command the PDF output is created successfully except that when opening the PDF : </p>
  
  <ul>
  <li>A dialog appears in Acrobat reader says "This document contained certain rights to enable special features in Adobe Reader. The document has been changed since it was created and these rights are no longer valid. Please contact the author for the original version of this document."</li>
  </ul>
  
  <p>Can anyone explain why I get the "This document contained ..." dialog and how to get rid of it ?</p>
  
  <hr>
  
  <p>As some background here's my process.</p>
  
  <p>As a starting point I used Adobes <a href="http://help.adobe.com/en_US/Acrobat/9.0/Samples/interactiveform_enabled.pdf" rel="nofollow">example interactive form from here</a> .</p>
  
  <p>I applied the pdftk command <strong>dump_data_fields</strong> to establish the names of the input fields in the PDF form and based upon that I then generated a FDF with some sample data as follows using the <a href="https://github.com/ccnmtl/fdfgen/" rel="nofollow">fdfgen library</a>:</p>
  
  <pre><code>#!python
  from fdfgen import forge_fdf
  fields = []
  fields.append(('Name_Last','Peters'))
  fields.append(('Name_First','John'))
  fdf = forge_fdf("",fields,[],[],[])
  fdf_file = open(".\\dataOut\\adobe-reference-interactiveform_enabled.fdf","w")
  fdf_file.write(fdf)
  fdf_file.close()
  </code></pre>
  
  <p>and then I execute the command :</p>
  
  <pre><code>pdftk.exe ".\dataIn\adobe-reference-interactiveform_enabled.pdf" fill_form ".\dataOut\adobe-reference-interactiveform_enabled.fdf" output ".\dataOut\adobe-reference-interactiveform_enabled_PostProcessing1.pdf" flatten verbose
  </code></pre>