In a novel lawsuit that tests the bounds of service provider liability, two music publishers brought suit against an ISP for contributory copyright infringement for allegedly facilitating infringement by failing to terminate the accounts of broadband subscribers who were purportedly repeat infringers that had unlawfully downloaded copyrighted music from BitTorrent

The copyright lawsuits brought by record company plaintiffs to redress file-sharing have yielded many decisions of first impression. However, the recent ruling by the First Circuit in In re Sony BMG, Inc. (1st Cir. Apr. 16, 2009)  is one of the few that is of interest not just to copyright litigators, but scholars of appellate procedure as well. The ruling includes a discussion of the contours of federal court of appeals mandamus jurisdiction and the circumstances under which prerogative writs should be issued to the lower federal courts. A rarefied discussion indeed.