Hidden Operating System
It may happen that you are forced by somebody to decrypt the operating system. There are many situations where you cannot refuse to do so (for example, due to extortion). TrueCrypt allows you to create a hidden operating system whose existence should be impossible to prove (provided that certain guidelines are followed).
Thus, you will not have to decrypt or reveal the password for the hidden operating system.
For more information, see the section Hidden Operating System in the chapter Plausible Deniability.
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