Pardon my imprecision. US Federal law only prevents the NTSB from publishing any CVR audio, and it looks like they have never leaked any. But lawyers can get them during the litigation, so they could, theoretically, leak them to the press, but there was a very strong reaction in the US to the release of CVR audio of AA965, the 757 that hit the mountain near Cali in 95, and that is probably what has prevented them doing it again.