NBC has replied to your comment (excerpted to exclude snark):
http://nativeborncitizen.wordpress.com/2013/08/11/edge919/
Edge919: This paragraph pretty much sums it up. This falls under the “too good to be true” category. Follow the timing by overcomplicating the explanation, which is just intended to confuse enough people to create doubt about Zullo’s investigation. Even with the multiple blogposts worth of “explanations,” there’s a problem if there was ANY kind of manipulation after the original scan. And there’s a second problem when the layers and manipulations can be EASILY explained by the process of creating a PDF from a digitally fabricated documented, such as through InDesign and then converted to PDF. Nothing offered in the new explanations can rule that out.
NBC: True, nothing can rule out manipulations that mimic a Xerox WorkCentre, but that is not at issue right now. What I have shown is that the claim of forgery was based on what is known as argument from ignorance: we do not know how it could have happened so it must have been forger. What I have shown is how simple processes explain most if not all of the artifacts. This of course complicates any meaningful forgery claims.
Yeah, it just looks an overly defensive reply, which helps reinforce that NBC is just blowing smoke. He calls his convoluted series of posts a “simple processes,” which of course is nonsense.