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How NetPurifier Works
Overview
NetPurifier is a hardware-and-software, set-it-and-forget-it device
that plugs into your network and redirects all Internet traffic to
itself. Only the NetPurifier communicates directly with the Internet.
Internet information for all other computers (e.g., Windows, Apple,
Linux) must first go through the filter system built into the
NetPurifier.
Filtering System
A three-tier filter system ensures that inappropriate content does
not reach the user.
First, NetPurifier compares the site with its blacklist to determine if
the address has already been deemed inappropriate.
The product then looks at the site rating, searching for the
industry-standard rating tags.
Finally, NetPurifier scans every word on the Internet page looking
for words that indicate inappropriate content. The context of these
words is then analyzed to determine if the page should be
blocked. This greatly reduces the number of false positives while
blocking those pages that are offensive. This feature accounts for
NetPurifier’s remarkable accuracy.
If the content passes through all three filters, NetPurifier allows the
page to be loaded on the user’s computer. If any of the filters fail,
an “Access Denied” page is sent to the user’s computer. All this is
done in a fraction of a second, with no delay seen by the user.