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Boxes and Arrows: All watched over by machines of loving grace: Some ethical guidelines for user experience in ubiquitous-computing settings [1]
Cogent piece explaining how designers must craft the emergent systems we will use, wear and inhabit.

Ubiquitous systems must offer users the ability to opt out, always and at any point.

As an absolute ethical imperative, users must be afforded the ability to make their own meaningful decisions regarding their exposure to ubiquitous perception, the types and channels of information such exposure will necessary convey, and the agencies receiving and capable of acting on such conveyance.

Critical to this is the ability to simply say “no,” with no penalty other than the inability to make use of whatever benefits the ubiquitous system offers its users.