Government and law enforcement justifications for warrantless access to Internet subscriber information has long been defended on the grounds that the information being demanded carries little privacy interest. The go-to claim was always that it was “phone book information”, a reference to the largely discontinued practice of printing an annual public directory that included name, address, and phone number. The problem with that argument was that the information at issue included data points such as IP addresses and device identifiers, which could be used to track users and monitor online activity without a warrant. Moreover, linking a specific user to a specific IP address or other identifier effectively unlocks the door to potentially very sensitive information that is otherwise unavailable. Indeed, there is a reason that law enforcement logged over a million warrantless requests per year for basic subscriber information prior to the Supreme Court shutting down the practice.
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