I think gevulot is the speculative fiction version of the Personal Data Store. (The Quantum Thief is an awesome book, massively recommend)

"Gevulot is a form of privacy practised in the Oubliette. It involved complex cryptography and the exchange of public and private keys, to ensure that individuals only shared that information or sensory data that they wished to. Gevulot was disabled in agoras."

http://exomemory.wikia.com/wiki/Gevulot

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