I don't know what the laws might have been back then (or what they are now, for that matter). But, from a practical standpoint, how do you prevent someone that records radio transmissions from releasing them? You might have rules saying that parties that have access to those recordings as part of their routine duties (like ATC or the FBI or NTSB) can't release them, but in the day of everything being recorded by tens of thousands (or millions) of people with a receiver and internet connection, it's pretty much impossible to prevent.I thought that releasing audio of fatal aviation accidents was not permitted. At least that's the way it was in the 1980's ... I guess the laws must've changed.