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Surveillance means using a device to watch over a person or persons at work. That device might be:

  • a data surveillance device, i.e. monitoring input or output of information into or from a computer;
  • a listening device, i.e. monitoring conversations or words spoken between two or more persons;
  • an optical surveillance device, i.e. recording vision or observing an activity, e.g. CCTV; or
  • a tracking device, i.e. determining the geographical location of a person, e.g. GPS.

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