Privacy is (0) AMONG those rights whose content has proven most difficult to specify in advance of the technologies that threaten it. Each generation inherits a legal framework designed to protect against the intrusions of the previous era, and is with the task of stretching that framework to cover intrusions its drafters could not have imagined. The photograph, the telephone, the database, and the surveillance satellite each fresh conceptual difficulties that the courts resolved, with varying success, by analogy to what had come before. The result is a body of doctrine that is with the traces of obsolete technologies, and whose vocabulary often to describe the phenomena it is meant to regulate. Some jurists have argued that this is a temporary , soon to be remedied by a new synthesis; others, more pessimistic, that the pace of technological change has permanently outrun the capacity of legal doctrine to keep up. Whichever view prevails, it is that the right to privacy can no longer be understood as a single, coherent entitlement. It is instead a family of related protections, unified less by any shared principle than by the common anxiety that animates them: the fear of being from a position of unchosen exposure.