"521 dwarfed by, the huge total volume of files shared. Further, the District Court and the Court of Appeals did not sharply distinguish between uses of Grokster’s and StreamCast’s software products (which this case is about) and uses of peer-to-peer technology generally (which this case is not about). In sum, when the record in this case was developed, there was evidence that Grokster’s and StreamCast’s products were, and had been for some time, overwhelmingly used to infringe and that this infringement was the overwhelming source of revenue from the products. Fairly appraised, the evidence was insufficient to demonstrate, beyond genuine debate, a reasonable prospect that substantial or commercially significant noninfringing uses were likely to develop over time. On this record, the District Court should not have ruled dispositively on the contributory infringement charge by granting summary judgment to Grokster and StreamCast. If, on remand, the case is not resolved on summary judgment in favor of MGM based on Grokster and StreamCast actively inducing infringement, the Court of Appeals, I would emphasize, should reconsider, on a fuller record, its interpretation of Sony’s product distribution holding. J USTICE B REYER , with whom J USTICE S TEVENS and J USTICE O’C ONNOR JOIN , CONCURRING . I agree with the Court that the distributor of a dual-use technology may be liable for the infringing activities of third parties where he or she actively seeks to advance the infringement. I further agree that, in light of our holding today, we need not n ow “revisit” Sony Corp. of America v. Universal City Studios, Inc., 464 U.S. 417 (1984). Other Members of the Court, however, take up the Sony question: whether Grokster’s product is “capable of ‘substantial’ or ‘commercially significant’ noninfringing"