![]() ![]() ![]() ![]() There are three commonly used techniques to block access to Internet sites: IP blocking, DNS tampering, and URL blocking using a proxy. Internet filtering normally refers to the technical approaches to control access to information on the Internet, as embodied in the first two of the four approaches described below. Internet censorship and content restrictions can be enacted through a number of different strategies which we describe below. The following briefly describes the various methods of Internet filtering, the inherent limitations of filtering, and the OpenNet Initiative’s methodology for the study of filtering practices. Many others are debating the enactment of similar measures and pursuing technological solutions to complex sociological issues. ![]() Drawing on arguments that are often powerful and compelling such as "securing intellectual property rights," "protecting national security," "preserving cultural norms and religious values," and "shielding children from pornography and exploitation," many states are implementing extensive filtering practices to curb the perceived lawlessness of the medium. The number of states that limit access to Internet content has risen rapidly in recent years. ![]()
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