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        Cox Communications is actively blocking BitTorrent file-sharing users from enjoying unfettered Internet services, according to a new study based on more than 8,000 Internet users. Like Comcast, which was the first major cable Internet service provider to be outed for throttling peer-to-peer data, Cox says it interferes with the traffic to ensure quality service for all of its customers. Comcast's Internet service tampering garnered the attention of federal regulators.