![I am pretty pissed off and what follows is accompanied by steam coming out of my ears, etc, etc Flame](/design_picker/fa16d26efb42e6ba1052f1d387470f643c5aa18d/graphics/icons/comment/flame_48.png)
A very very slippery slope...
A while ago, Speed Cameras faced a challenge in the European courts. The plaintiffs argued that their right to not incriminate themselves was violated because they were forced to identify the driver at the time the camera snapped them. Failure to identify the driver is a criminal offense.
The defense (or judge, whatever) in this case successfully argued that by driving a car, you accept the rules - one of which is to incriminate yourself if you're caught speeding.
I can see a future judge saying, "by using a computer you accept the rules of doing so, one of which is to provide keys when required to do so by law enforcement authorities..."
Both of these situations are completely unacceptable. As a fundamental principal of justice, the right not to incriminate yourself should be absolute in all cases.