Google, Viacom settle suit over YouTube

""They (Viacom) see it as a useful way to monetize their content," said Julie Ahrens, director of copyright and fair use at Stanford University's Center for Internet and Society. "They don't control every copy of songs, movies or clips that get put up on YouTube, but if a user puts it up, they can say, 'OK, we know it's there and we're OK with it.' ""