"520 available through peer-to-peer networks including those accessed through Grokster’s and StreamCast’s software. The District Court declared it “undisputed that there are substantial noninfringing uses for Defendants’ software,” thus obviating the need for further proceedings. This conclusion appears to rest almost entirely on the collection of declarations submitted by Grokster and StreamCast. Review of these declarations reveals mostly anecdotal evidence, sometimes obtained second-hand, of authorized copyrighted works or public domain works available online and shared through peer-to-peer networks, and general statements about the benefits of peer-to-peer technology. These declarations do not support summary judgment in the face of evidence, proffered by MGM, of overwhelming use of Grokster’s and StreamCast’s software for infringement. 6 Even if the absolute number of noninfringing files copied using the Grokster and StreamCast software is large, it does not follow that the products are therefore put to substantial noninfringing uses and are thus immune from liability. The number of noninfringing copies may be reflective of, and 6 Justice BREYER finds support for summary judgment in this motley collection of declarations and in a survey conducted by an expert retained by MGM. That survey identified 75% of the files available through Grokster as copyrighted works owned or controlled by the plaintiffs, and 15% of the files as works likely copyrighted. As to the remaining 10% of the files, “there was not enough information to form reasonable conclusions either as to what those files even consisted of, and/or whether they were infringing or non- infringing.” Even assuming, as Justice BREYER does, that the Sony Court would have absolved Sony of contributory liability solely on the basis of the use of the Betamax for authorized time-shifting, summary judgment is not inevitably appropriate here. Sony stressed that the plaintiffs there owned “well below 10%” of copyrighted television programming, and found, based on trial testimony from representatives of the four major sports leagues and other individuals authorized to consent to home-recording of their copyrighted broadcasts, that a similar percentage of program copying was authorized. Here, the plaintiffs allegedly control copyrights for 70% or 75% of the material exchanged through the Grokster and StreamCast software, and the District Court does not appear to have relied on comparable testimony about authorized copying from copyright holders."