Keywords

#pen_register

Pen register

Device that records all numbers called from a particular telephone line

A pen register, or dialed number recorder (DNR), is a device that records all numbers called from a particular telephone line. The term has come to include any device or program that performs similar functions to an original pen register, including programs monitoring Internet communications.

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Pen register USA Freedom Act Title 18 of the United States Code Terrorist Surveillance Program Trap and trace device Stingray phone tracker Stingray use in United States law enforcement Section summary of Title II of the Patriot Act Pen (enclosure) Pen (disambiguation)
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