Some time around May 2007, Comcast installed new software or equipment on its networks that began selectively interfering with some of Comcast's customers' TCP/IP connections.1 The most widely discussed interference was with certain BitTorrent peer-to-peer (P2P) file-sharing communications, but other protocols have also been affected. This white paper is intended to set forth the current state of public knowledge about Comcast's interference activities.
from an article on the EFF Web site
Not so much a whodunnit but a howtheydidit.
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