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By Ronald J. Deibert, John G. Palfrey, Rafal Rohozinski, Jonathan Zittrain

Many nations all over the world block or clear out net content material, denying entry to information—often approximately politics, but additionally with regards to sexuality, tradition, or religion—that they deem too delicate for usual voters. entry Denied records and analyzes net filtering practices in over 3 dozen nations, supplying the 1st carefully performed examine of this accelerating development. net filtering happens in a minimum of 40 states all over the world together with many nations in Asia and the center East and North Africa. similar net content material regulate mechanisms also are in position in Canada, the us, and a cluster of nations in Europe. Drawing on a just-completed survey of world net filtering undertaken via the OpenNet Initiative (a collaboration of the Berkman middle for web and Society at Harvard legislation institution, the Citizen Lab on the college of Toronto, the Oxford net Institute at Oxford collage, and the collage of Cambridge) and hoping on paintings by means of nearby specialists and an in depth community of researchers, entry Denied examines the political, criminal, social, and cultural contexts of net filtering in those states from numerous views. Chapters talk about the mechanisms and politics of web filtering, the strengths and barriers of the know-how that powers it, the relevance of overseas legislations, moral concerns for companies that offer states with the instruments for blocking off and filtering, and the consequences of web filtering for activist groups that more and more depend on net applied sciences for speaking their missions. studies on web content material rules in 40 varied international locations stick with, with each one state profile outlining the categories of content material blocked through type and documenting key findings. Contributors : Ross Anderson, Malcolm Birdling, Ronald Deibert, Robert Faris, Vesselina Haralampieva, Steven Murdoch, Helmi Noman, John Palfrey, Rafal Rohozinski, Mary Rundle, Nart Villeneuve, Stephanie Wang, and Jonathan Zittrain

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Extra info for Access Denied. Practice and Policy of Global Internet Filtering [censorship]

Example text

In addition to blocking the IP for Blogspot, they also block Yahoo’s hosting service, which results in major overblocking. com they are actually blocking more than 52,000 other Web sites hosted on that same server. DNS tampering is achieved by purposefully disrupting DNS servers, which resolve domain names into IP addresses. Generally, each ISP maintains its own DNS server for use by its customers. To block access to particular Web sites, the DNS servers are configured to return the wrong IP address.

Il’’ address may have a hard time accessing content in the UAE as a result of the filtering there. -based Secure Computing’s SmartFilter, Websense, and Fortinet, appear to assist, or to have assisted, states that filter with the implementation and management of block lists. These services provide extensive lists of URLs categorized using proprietary methods. The commercial services typically fall in the middle of a spectrum between manual and automated filtering. The URL for a site found to contain content related to gambling will be offered as a digital update to the ‘‘gambling’’ block list of those states subscribing to the filtering services’ lists.

These licenses tend to include requirements, explicit or implicit in nature, that the ISPs implement filtering at the behest of the state. Some states partially centralize the filtering operation at private Internet exchange points (IXPs)—topological crossroads for network traffic—or through explicit state-run clearing points established to serve as gatekeepers for Internet traffic. Some states implement filter´s or in pubing at public Internet access points, such as the computers found within cybercafe lic libraries and schools, as in the United States.

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