encrypted file system on a dvd

Is tehere any smart way to have a dvd with an encrypted iso9660 fs which decrypted on the fly? I tried truecrypt which is really good, but asks me to burn a encrypted fs on a file to the dvd, and it's a pain to mount it everytime i want to change dvd. is there some way to do it without mount/unmounting? (ie: windows automount?)

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Non-playable characters? National Panhellenic Conference? National Press Club? National Prescribing Centre? National Petroleum Council? National Postgraduate Committee? National Petrochemical Company?