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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Telephone tapping is the monitoring of telephone and Internet conversations by a third party, often by covert means. The telephone or wire tap received its name because, historically, the monitoring connection was an actual electrical tap on the telephone line. Legal wiretapping by a government agency is also called lawful interception. Passive wiretapping monitors or records the traffic, while active wiretapping alters or otherwise affects it.