A pen register is an electronic 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.
The United States statutes governing pen registers are codified under 18 U.S.C., Chapter 206.
Read more about Pen Register: Definitions, Background, Pen Register Act, USA-PATRIOT Act, NSA Call Database Controversy, Pen Registers in Popular Culture
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