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"One can see the free software movement as a precusor for a "free hardware" or "free wetware" movement--one that will provide free libraries of designs for biological or nanotechnological products that replicators can be programmed to churn out."
- Charles Stross

Hush Hood  
  A device that cancels noise, ensuring that others cannot overhear.  

"...Where is he?"

"A public phone in a taproom called The Iceman's Wife underneath the -"

"I know, Mike, when you switch me in, can you stay in circuit? Want you to monitor."

"It shall be done."

Can you tell if anyone is in earshot? Hear breathing?"

"I infer from the anechoic quality of his voice that he is speaking under a hush hood..."

From The Moon is a Harsh Mistress, by Robert Heinlein.
Published by GP Putnam in 1966
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