NEW YORK - Big Media took its first big swing at YouTube Tuesday as Viacom Inc., the owner of MTV, VH1, Comedy Central and other cable networks filed a $1 billion copyright lawsuit against the video-sharing site and corporate owner Google Inc.

The lawsuit marks a sharp escalation of long-simmering tensions between Viacom and YouTube and represents the biggest confrontation to date between a major media company and the hugely popular site, which Google bought in November for $1.76 billion.

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