| http://www.w3.org/ns/prov#value | - Blocking or filtering can be done at a centralized national level, at a decentralized sub-national level, or at an institutional level, for example in libraries, universities or Internet cafes.[1] Blocking and filtering may also vary within a country across different ISPs.[7] Countries may filter sensitive content on an ongoing basis and/or introduce temporary filtering during key time periods suc
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