"A court decision reached last month but under seal until Friday could force Web sites to track visitors if the sites become defendants in a lawsuit."
On May 29th a federal judge, Jacqueline Chooljian, from the Central District of California in L.A. ordered TorrentSpy--a Bittorrent (BT) search engine--to "create logs detailing users' activities on the site."
The case began when the Motion Picture Association of America (MPAA) sued TorrentSpy (and some others) in February of '06 for facilitating the use of torrents to download pirated files.
EFF's attorney, Fred von Lohmann, calls the ruling "unprecedented" and from his continuing review of the case says that it is a "troubling court order" where "We shouldn't let Web site logging policies be set by litigation."
Source: C|Net News.com