Viacom wants 1B from Google’s popular video-sharing site YouTube, saying that the cable destination unfairly benefits from allowing Viacom content to be posted in its virtual space. As part of its defense, YouTube wants to call to the witness stand two Viacom employees working at its Comedy Central cable channel – faux newsmen Jon Stewart and Stephen Colbert. YouTube also want a piece of Viacom honcho Sumner Redstone, among others. It says it needs to prove that oftentimes programmers and stars themselves either encourage fans to post their material, as Colbert is said to have done, or they put material there themselves as a promotional device. Google/YouTube says it promptly takes down all copyrighted material upon notification.