Apple Version 3 User Manual download pdf (Page 42)

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Smart Filter Technology

Blacklists and the PICs rating system are very effective if the

offending web site is known and if they properly rate themselves.

100’s of new sites catering to pornography and other inappropriate

content are added to the Internet weekly.

To insure that these sites are blocked, until they can be added to

the Blacklist, NetPurifier uses Smart Filter Technology. Smart

Filter scans and assigns a numeric weight to each word on the

requested page. Appropriate words are assigned a negative value

while inappropriate words are assigned a positive value.

NetPurifier then adds these weights together and derives a value

for the page. This value is then compared with the Smart Filter

threshold described in Chapter 3. If the threshold is exceeded the

page is denied. If the threshold is not exceeded the page is

displayed.

An example of this in action is a search engine search for “nude

breasts”. The page will be denied as it brings up multiple

pornographic sites and the threshold is exceeded.

A search on the phrase “breast cancer” is not blocked. The good

words found on the page modify the bad words—allowing the

page to be displayed.

Note: Smart Filter is biased to “not show the page if in

doubt”. This reduces the chance that children

will be exposed to inappropriate content. As a

result of this bias there may be cases where a

user believes they have entered a very safe

query but the page is blocked. If so, a more

defined search may bring better results. Using

the example above a search on “breast cancer”

will yield better results than “breast” Even better

word be “breast cancer research”.

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Apple Version 3 User Manual Page 42