My thought on this is that there is no proof that the computer records were not altered in anyway to mislead the Grand Jury and without the testimony, Cooper cannot be held for perjury. Additionally, there is also the side investigation into the CIA leak to the terrorist supporting agency that was being investigated by HSA, that would not be included in notes.
I don't understand why no one else is talking about this side investigation.
Ah, ha, I'm at least partially proven right, the prosecutor wants to talk to Cooper about the substance of his conversations with his sources (CIA?) on subjects other than the identity of Valerie Plame.