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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Brightview announces blocking system for child abuse websites <a href="http://www.iwf.org.uk/media/news.archive-2005.111.htm" target="_blank">http://www.iwf.org.uk/media/news.archive-2005.111.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Failures in a Hybrid Content Blocking System" (PDF). Retrieved 2023-10-31. <a href="http://www.cl.cam.ac.uk/~rnc1/cleanfeed.pdf" target="_blank">http://www.cl.cam.ac.uk/~rnc1/cleanfeed.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>BT opens wallet for Brightview <a href="https://www.theregister.co.uk/2007/07/06/bt_brightview_buy/" target="_blank">https://www.theregister.co.uk/2007/07/06/bt_brightview_buy/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>