What is your printer doing behind your back?

The researchers concluded that enforcement agencies are looking only at I.P. addresses of participants on these peer-to-peer networks, and not what files are actually downloaded or uploaded — a more resource-intensive process that would nevertheless yield more conclusive information....

The researchers rigged the software agents to implicate three laserjet printers, which were then accused in takedown letters by the M.P.A.A. of downloading copies of “Iron Man” and the latest Indiana Jones film.

[From The Inexact Science Behind D.M.C.A. Takedown Notices - Bits - Technology - New York Times Blog]