Plausible deniability

http://en.wikipedia.org/wiki/Plausible_deniability

http://www.forbes.com/sites/jonmatonis/2012/09/12/key-disclosure-laws-can-be-used-to-confiscate-bitcoin-assets/ Many observers have suggested defensive techniques that deploy TrueCrypt disk encryption with hidden volume partitions or PGP Whole Disk Encryption rendering the entire computer unbootable thereby making even file time and date stamps unavailable. Another legal strategy to complicate matters could be to split the passphrase with another person and claim that you are never in possession of the entire real passphrase. Then, at least there would be “plausible deniability” as to who provided the invalid portion of the passphrase or you would have a cellmate if held in contempt.

Jailed for refusal to reveal key. The person is mentally ill and tried to make sort of principled stand, had he used double encryption it would be impossible to prove that the encrypted data itself(harmless fluff) contained encrypted data.

http://www.theregister.co.uk/2009/11/24/ripa_jfl/