| http://www.w3.org/ns/prov#value | - As it???s opaque to the customer, they may simply not know that certain types of content are just not reachable from their router (unless a clear message comes up, rather than a simple timeout/404, that states what site was blocked, why, what category it fell under, and how to contact the ISP to turn the filter off or to challenge the categorisation).
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