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Blacklist (computing)
In computing, a blacklist or block list is a basic access control mechanism that allows through all elements (email addresses, users, URLs, etc.), except those explicitly mentioned. Those items on the list are denied access. The opposite is a whitelist, which means only items on the list are let through whatever gate is being used. A greylist contains items that are temporarily blocked (or temporarily allowed) until an additional step is performed.
For example, a company might prevent a list of software from running on its network or a school might prevent a list of web sites from being accesses on its computers.
==Information systems==
The opposite of whitelisting, blacklisting allows everything to run unless it is on a predetermined "blacklist." A blacklist includes certain types of software that are not allowed to run in the company environment. For example, a company might blacklist peer to peer file sharing on its systems. In addition to software, people, devices and Web sites can also be blacklisted.
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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