Time release crypto

Incoming from Stephen D. Williams:
> 
> What minimal requirements would be needed to support encrypted packets/files
> that a holder could only decrypt after a certain date/time?
> (Time Escrow?)

	How do you expect the system to reliably tell accurate time?
What's to stop anyone from just resetting the clock to get at what
they want?

	As always, physical access to the system breaks all security.

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