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The Web filter uses two main methods to determine whether or not to
block a given URL request based on the Web site content:
matching—Web requests are
checked against the Web Reputation database; the URL, category, user,
and the highest-priority policy that contains the requesting user are
all resolved and the appropriate action taken.
rating—Web pages not found
in the Web Reputation database are assessed and a content probability-rating
is determined on the fly (in real time); the page rating and category
are then evaluated against the highest priority policy containing the
A Web page is categorized based on the aggregate weighting of all words
on that site, which helps prevent over-blocking or incorrectly blocking
a specific page. Once a URL/domain has been categorized and verified in
another layer of the filter, the URL/domain is placed in the local cached
database, which can be periodically uploaded to join the aggregate URL
Each word gets assigned a probability rating for each of the 80-plus
categories. For example, the English word ”casino,” which may appear most
frequently in the ”gambling” category—where
it receives the highest probability rating—may
also have a statistical rating in all of the other categories. This implies
that just because ”casino” is associated with gambling does not mean it
is necessarily a gambling page.
Currently, real-time ratings focus on the most common languages that
appear on the Web. As the need increases, full or partial coverage in
other languages is being added.
Because of the exposure, liability and risk that organizations face
when users access pornographic or adult material, the URL Filter is very
good at recognizing and accurately rating this type of content. It is
also very good at recognizing the ”potentially offensive” categories listed.
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