A British court has ruled the spy agency GCHQ acted illegally when it accessed data gathered by the National Security Agency through mass surveillance. The Investigatory Powers Tribunal, which oversees British spy agencies, ruled the secrecy surrounding the data-sharing program broke British human rights law. But the court found the program is now legal, because more information has been made public after civil liberties groups filed suit. The case marks the first time in its 15-year history the court has ruled against the spy agency.