My understanding is that the judge ruled that survivors and families of survivors learned that the tape had been created and was being used for training, and they demanded that it be released as evidence--under Freedom of information or some such thing--If this is the case, then legally the songs cannot be removed, and the tape cannot be altered in anyway that is not incidental to the process of reproduction--

This misunderstanding is why I hate TV news so much--when you got to the newspaper archive website and read, you come away with a completely different picture than if you listen to or watch the news--