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Internet filter
An Internet filter is software that removes certain network traffic, which can be done with or without informed consent of the end user. Restrictions can be applied at various levels: a government can attempt to apply them nationwide (see Internet censorship), or they can, for example, be applied by an Internet service provider to its clients, by an employer to its personnel, by a school to its students, by a library to its visitors, by a parent to a child's computer, or by an individual user to their own computers…
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