SOURCE
"The Institute had more than 8,000 users from around the globe use its Glasnot tool between March 18 and May 15 to test whether BitTorrent traffic was being manipulated. The test touched 90 countries and 1,224 ISPs.

Study results were limited to ISPs that blocked BitTorrent transfers with RST packets rather than just those that throttled or rate-limited their traffic, report authors said. All the companies allegedly engaged in blocking did so in the upstream direction, with only a handful reporting downstream BitTorrent transfer blocking.

"We found widespread blocking of BitTorrent transfers only in the U.S. and Singapore," the report said. "Interestingly, even within these countries, most of the hosts that observed blocking belonged to a few large ISPs."

In the U.S., most of the users who observed blocking were using Comcast and Cox Communications, the study said. Seven other U.S.-based ISPs also engaged in blocking, but that activity was not widespread, according to the report.

Of the 788 Glasnot users on Comcast, for example, 491 of them experienced blocking while 82 of the 151 Cox users were blocked, the study said.

Comcast denied any wrongdoing.

"Comcast does not, has not, and will not block any websites or online applications, including peer-to-peer services like BitTorrent," according to a spokeswoman. "We have acknowledged that we manage peer-to-peer traffic in a limited manner to minimize network congestion."

Comcast pointed to its recent deal with BitTorrent, under which Comcast agreed to develop a protocol-agnostic network management technique by year's end. The company also partnered with Pando Networks to develop a P2P Bill of Rights.

"Cox's network management practices ensure that bandwidth-intensive applications don't negatively impact our customers' Internet service," according to a Cox spokesman. "Cox allows the use of file-sharing and peer-to-peer services for uploads and downloads, and we allow access to all legal content, but we must manage the traffic impact of peer-to-peer services, as most ISPs do for the benefit of the customer. We'll continue to seek even better ways to manage our network to ensure a high-quality experience for our customers."

in a limited manner, my ass. of course they'd deny any wrongdoing, it's not nice being painted as an internet communist regime (which they are)