An anonymous reader writes "Google responded to the opinion piece in the Washington Post by a Viacom Lawyer with a letter to the editor titled 'An End Run on Copyright Law.' Their strong wording sends a very concrete message: 'Viacom is attempting to rewrite established copyright law through a baseless lawsuit. In February, after negotiations broke down, Viacom requested that YouTube take down more than 100,000 videos. We did so immediately, working through a weekend. Viacom later withdrew some of those requests, apparently realizing that those videos were not infringing, after all. Though Viacom seems unable to determine what constitutes infringing content, its lawyers believe that we should have the responsibility and ability to do it for them. Fortunately, the law is clear, and on our side.'"