"...the U.S. District Court for Vermont ruled that because the defendant had already cooperated as far as he had and already potentially incriminated himself, by stating his ownership of his laptop and providing law enforcement with partial access to it prior to his arrest, that he must now surrender complete access to all information on that laptop, even encrypted and potentially self-incriminating or confidential information.[20] Because the defendant had cooperated in part already, the Court ruled that the defendant must continue cooperation and provide the decrypted and potentially harmful information to the government..."
http://en.wikipedia.org/wiki/Right_to_silence#United_States
"...the U.S. District Court for Vermont ruled that because the defendant had already cooperated as far as he had and already potentially incriminated himself, by stating his ownership of his laptop and providing law enforcement with partial access to it prior to his arrest, that he must now surrender complete access to all information on that laptop, even encrypted and potentially self-incriminating or confidential information.[20] Because the defendant had cooperated in part already, the Court ruled that the defendant must continue cooperation and provide the decrypted and potentially harmful information to the government..."