For years, P2P communities have suspected that affiliates of the RIAA, the MPAA, and others have been haunting P2P networks to look for those who might be swapping copyrighted files. It's more than a hunch; it's well documented that companies like SafeNet (formerly Media Sentry) engage in this sort of work, and that their testimony is routinely produced at trials.
If you don't use a blocklist, you will be tracked. Every one of the researchers' test clients that did not use a blocklist soon connected to an IP address found within those lists. It turns out that 12 to 17 percent of all IP addresses on the network belonged to these blocklisted ranges.
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