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> I fail to see how this solves any problem or is useful deterrence of the police seizing your box.

It's not a deterrence to seizing the box. It's a deterrence to finding anything on the box after seizing it.

And the arms race continues. I expect this will work only as long as law enforcement doesn't recognize it's a ram only box, after which they'd just keep it plugged in or drop it into liquid nitrogen to preserve the bits if they cared enough.

Easier said than done, power can be cut in an instant or even automatically (triggered by unauthorized entrance to a facility, for example).

If they get to it in time, that probably won't matter: http://www.nytimes.com/2008/02/22/technology/22chip.html

It will give a whole new meaning for when cops shout "Freeze!".

Dynamic ram refresh intervals are mindbogglingly conservative, especially if you're not running near the upper-temperature limit. In other words, DRAM doesn't lose information anywhere near as fast as the refresh intervals might suggest.

http://www.wiebetech.com/products/HotPlug.php

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