The concept of surveillance in general is to monitor behavior, activities, or other changing information usually of people; and the purpose of this activity is for the purpose of influencing, managing, directing, or protecting them. This can include observation from a distance through electronic equipment (such as CCTV cameras), or interception of electronically transmitted information (such as Internet traffic or phone calls); and it can include simple, relatively no- or low-technology methods such as human intelligence agents and postal interception. In order to manually intercept the trespassing or unauthorized entry/activities.