DeSopa takes advantage of an blatant weakness in how SOPA?s controversial filtering mandate would function under the current version of the bill. The new copyright infringement regime would allow editing of the Domain Name System, the registry that converts websites? domains (like Google.com or Yahoo.com) into an Internet Protocol address (like 74.125.157.99 or 98.137.149.56). When you type ?Google.com? into your browser, your computer communicates with DNS servers that convert that name into an IP address. But type the IP address directly into your browser, and it works just as well.
Since SOPA would lead to editing American DNS servers? IP lists to insert errors for sites deemed illegal, DeSopa simply checks with foreign DNS servers to find the correct IP address and navigates directly to whatever blocked site the user enters. To avoid incorrect IP addresses in those foreign servers, the program even checks domains with three DNS servers and grabs whichever IP address has at least two agreeing answers. ?Similar offshore resolution services will eventually maintain their own cache of websites, without blacklisting, in order to meet the demand created by SOPA,? writes Rizk.
http://www.forbes.com/sites/andygree...ts-censorship/