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Possible Duplicate:
Parental controls with different settings for different users

is there anti filter program for internet and some websites in ubuntu?

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marked as duplicate by Jorge Castro, Marco Ceppi Jun 5 '11 at 19:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Yes and there is even a page on the Ubuntu wiki about this: https://wiki.ubuntu.com/ContentInternetFiltering

From that page I took the names and added a link where you can learn more about this:

  1. ContentInternetFiltering/Willow: https://wiki.ubuntu.com/ContentInternetFiltering/Willow
  2. DansGuardian: http://dansguardian.org/
  3. SquidGuard: https://help.ubuntu.com/community/SquidGuard
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