On the other hand, if you can be compelled to divulge the passphrase to any encrypted container, what happens if you forget it? What happens if you happen to ha

On the other hand, if you can be compelled to divulge the passphrase to any encrypted container, what happens if you forget it? What happens if you happen to have a block of random-looking data? It might be an encrypted container -- or it might be something entirely different. If I were to go through my old hard drives, USBsticks and whatnot, I'm reasonably sure I'd stumble on to random blocks of data and/or encrypted archives with passwords long since forgotten. If I could be punished for not producing matching passphrases, those could become a huge liability, very quickly.