Many years ago I stumbled across the Raiders Of The Lost Ark story conference transcript on a film review website. Supposedly this is a typed transcript of several audio-taped story conferences between George Lucas, Steven Spielberg and Lawrence Kasdan, wherein they discuss the origins and motivations of the Indiana Jones character and the story beats of what would ultimately become Raiders.
The version of the transcript that I read at the time was a PDF containing a number of photocopied typewritten pages. I've since seen other versions where the transcript is more typeset, as though the text has been re-typed into a word processing or desktop publishing program.
Regardless of format, and in relation to the actual content of the transcript, has its authenticity ever been verified? It certainly seems legitimate, so much so that if it is a fake then it is an extremely plausible one. Have Lucas, Spielberg or Kasdan ever mentioned this transcript or its content at all?
(Please note that I am not asking whether the story conferences ever took place, as it seems clear from other sources that they did.)
EDIT: I'm not going to link directly to the transcript PDF for legal reasons, but this blog post by screenwriter John August briefly discusses the transcript: follow a couple of additional links from there and you'll find the original. Alternatively, Google/Bing the keywords
raiders story conference transcript.