They just added to the list of legal defenses that can protect "bothersome" people [0]. We basically now have evidence that can be used to claim reasonable doubt whenever a bothersome person is in court defending themselves. Since the state is likely to rely on state secrets laws to prevent this information from being subpoenaed in a trial, the possibility that the state used this tactic against a bothersome person can no longer be ruled out and that should constitute reasonable doubt.

It would be supremely ironic if all these NSA surveillance shenanigans resulted in a broad invalidation of any digital evidence in a court of law when bothersome people are involved.

[0] http://martinfowler.com/articles/bothersome-privacy.html