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lockdown
There are several definitions for the term ''lockdown'', the most common of which pertains to a state of containment or a restriction of progression. A lockdown is an emergency protocol to prevent people or information from escaping, which usually can only be ordered by someone in command. Lockdowns are also used to protect people inside a facility or, for example, a computing system, from a dangerous external event.
There may be various levels of lockdown. For example, in the case of buildings, a partial lockdown means that the doors leading outside of the building are locked and people may not exit or enter the building. A full lockdown means that people must stay where they are and may not exit or enter a classroom, apartment unit, store unit, an office space, condo unit or the building. If people are in a hallway they must go into the nearest classroom, apartment unit, condo unit, office space or store unit.
==Types==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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