看你把這個 recording 用在什麽地方了, 如果不是作為 court裏
的證據, 有什麽 legal 不 legal 的???
這個不是 telephone conversation, 如果是 telephone 的話, 在 recording 前要讓對方知道你在 recording (such as something like: this conversation will be recorded for xxxx purpose).
當然 recording a private conversation without the other party knowing is not the right thing to do anyway。