title: Detect position of watermark in a pdf
body: <p>I am on ubuntu.</p>
  
  <p>I have a pdf file with pages divided into a grid. Each block of the grid contains name/age/dob/photo of a candidate. some records have a watermark "disqualified"</p>
  
  <p>I need to scrape his pdf, with disqualified candidates in a separate list. 
  Using pyPdf I was able to get individual records, but it also includes watermarked candidates.</p>
  
  <p>How to detect the watermark? If I can get the coordinates of the watermark, how do I match it with the candidate?</p>
  
  <p>I am open to solutions other than python pyPdf</p>