title: Chinese characters instead of text into the metadata called "Producer"
body: <p>I have a problem when I edit the metadata of a pdf with iTextSharp.
  I save a word document in pdf with Word. The field called "Producer" is filled by word with the text "Microsoft Word 210". After, I edit the metadata with ITextSharp and iTextSharp tries to edit this field in order to add the text "modified using iTextSharp 4.1.6".</p>
  
  <p>The result is <code>Producer(þÿMicrosoft® Word 2010; modified using iTextSharp 4.1.6 by 1T3XT)</code>. In adobe reader, the field PDF Producer in document properties shows chinese characters.</p>
  
  <p>Adobe can read the field if I remove manually the characters <code>þÿ</code>.</p>
  
  <p>Do you know why I have this problem ?
  What can I do to solve this problem ?</p>