"Specific information demonstrating that the alleged dragnet has not occurred cannot be disclosed on the public record without causing exceptional harm to national security," Mukasey wrote in a federal court filing in San Francisco. "However, because there was no such alleged content-dragnet, no provider participated in that alleged activity."
There are known knowns. There are things we know that we know. There are known unknowns. That is to say, there are things that we now know we don’t know. But there are also unknown unknowns. There are things we do not know we don’t know.