An apparatus is disclosed for protecting a computer system from an unintended or a malicious removal of power by a user. The apparatus has a power supply for supplying power to the computer system, a non-volatile memory to store a shutdown key for authorizing a shutdown of the power supply, and...http://www.google.de/patents/US5751950?utm_source=gb-gplus-sharePatent US5751950 - Secure power supply for protecting the shutdown of a computer system
