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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Keyboard With Changing Keys  
  A computer keyboard with keys faced with little displays, so the label could change based on the application or language.  

There were fifty neat little studs; each, however, had an unlimited number of functions, according to the mode of operation - for the character visible on each stud changed according to the mode.
From Imperial Earth, by Arthur C. Clarke.
Published by Harcourt Brace in 1976
Additional resources -

One of the features on Clarke's Minisec.

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Additional resources:
  More Ideas and Technology from Imperial Earth
  More Ideas and Technology by Arthur C. Clarke
  Tech news articles related to Imperial Earth
  Tech news articles related to works by Arthur C. Clarke

Keyboard With Changing Keys-related news articles:
  - Optimus OLED(Not!) Keyboard Chameleon

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