Reverse detection

Japanese: 逆探知 - ぎゃくたんち
Reverse detection
To trace a telephone or telegraph communication back to its source. This is often used by investigative agencies, with the cooperation of Nippon Telegraph and Telephone Corporation (NTT), to track down the source of a call from a criminal in cases of kidnapping for ransom, blackmail, or intimidation. Even if the receiving party consents, this is problematic in terms of the secrecy of communications and the protection of privacy. Some say that in such cases, the sender has no right to demand secrecy or privacy, while others say that it is permissible as a kind of self-defense.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
電話,電信などについて,その通信を逆にたどってその発信先を突止めること。特に,身代金目的の誘拐事件や恐喝,脅迫事件などにおいて,電話による犯人からの連絡について,捜査機関が日本電信電話株式会社 NTTの協力のもとに発信先を追及する際に利用されることが多い。たとえ受信側の当事者の同意がある場合でも,通信の秘密,プライバシーの保護という点から問題があるが,上のような場合には発信者に秘密・プライバシーの権利を求める資格がないとする見解や,一種の正当防衛的な性格をもつものとして許容されるとする見解がある。

出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報

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