NSA fears helping 'adversaries'

Shortly after the Guardian and Washington Post published their Verizon and PRISM stories, Jeff Larson of Pro Publica filed a freedom of information request with the NSA seeking any personal data the agency has about him: " I didn't expect an answer, but yesterday I received a letter signed by Pamela Phillips, the Chief FOIA Officer at the agency (which really freaked out my wife when she picked up our mail).
The letter, a denial, includes what is known as a Glomar response -- neither a confirmation nor a denial that the agency has my metadata. It also warns that any response would help “our adversaries". More here
[Thanks BJS]