title: how to find header footer from pdf files
body: <p>I want to find/extract the header or footer from pdf file. 
  I know it can be done by apose.net library but it is not free. I searched internet but cound not find a free library for extracting header or footer. </p>
  
  <blockquote>
    <p>Many library like itextsharp can just add header or footer but not
    extract or find header or footer.</p>
  </blockquote>
  
  <p>I do not find any method to extract the header or footer.</p>
  
  <p>How can i do it? </p>