Briefs defending Grokster's right to exist were filed yesterday in MGM v. Grokster, from Intel, Creative Commons [PDF], and many others. Among them, 17 computer science professors laid out the case for P2P, beginning with principles: "First, the United States' description of the Internet's design is wrong. P2P networks are not new developments in network design, but rather the design on which the Internet itself is based." Pointedly, the EFF compares this case's arguments to those made over 20 years ago in the Betamax case, which established the public's right to use video-copying technology, because of its "substantial non-infringing uses," even though many used videotape to infringe copyright. We'll soon see whether that right will extend to peer-to-peer software: the Supreme Court takes this up on March 29th.