Cryptographic filesystem with plausible deneyability. Withdrawn by original developers.

Good for study of filesystem concepts of plausible deniability.

Here the filesystem has a need to know approach.

So if one has not enough security clearance to the system, he will even overwrite data of higher security clearances. So he will never know how many levels of clearance are above him.

If one beats a passphrase from you, you gibe the passphrase for you normal porn collection.

if he beats more, because there must be more the pig insists, you give the password of your perverted porn collection and tell him, you wanted to hide it away from your wife.

But the big will never know that you hat top secret stuff on your machine ...

Nice approace, partly realized in truecrypt. But this approach has much more paranoia.