title: iText flattening issue with watermark text
body: <p>I am using iTextSharp to add watermarks to existing documents that are in PDF format. I read them in, create a PdfTemplate object, add the watermark text, color, transparency, etc... to this PdfTemplate, then add the template to a PdfContentByte that I get using PdfWriter.DirectContent.</p>
  
  <p>This solution has been working for a while for all documents that I throw at it, but for some reason a few particular PDFs have been printing with an opaque rectangle around the watermark text.</p>
  
  <p>I have tried a number of things already, including setting the PdfGState's OverPrintMode to 1, opening the generated file after it is created and then using PdfStamper's setFormFlattening and setFreeTextFlattening before saving a new copy... Nothing has worked so far.</p>
  
  <p>The issue is that I don't care about flattening form fields or buttons, I just want to flatten all the layers of the document after I have generated the entire thing. Is this even possible with the iText API?</p>