Playing Devil's Advocate, the Feds are going after Snowden not on the premise of censoring him. Instead, they are arguing that as part of his employment agreement, they have the right to vet anything IP related he publicly discloses. It's similar to many employer-employee relationships. I've had to pass my slide deck to my manager to screen before speaking at conferences and many companies have an officially sanction…
There's nothing in the book about CIA or NSA operations that isn't already public knowledge.