True, but Snowden's data haul is at least a year and a half old by now, and some of the files cited in this article date back longer than that. But I edited my

True, but Snowden's data haul is at least a year and a half old by now, and some of the files cited in this article date back longer than that. But I edited my comment to include your point: no hard proof that this technique was used...yet.