Viacom has also lodged a $1 billion lawsuit against Web search leader Google Inc and its video-sharing site YouTube over unauthorized downloads of its entertainment.
Chief Executive Philippe Dauman said last month the companies could work together in the future, but Google still needed to improve on recent efforts to better protect copyrights.
Viacom Class B shares are down 1.7 percent to date in 2007, compared with a 6.4 percent rise in the Standard & Poor's 500 Index in that time.

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Online distributor for point of sale equipment, TYSSO and Pegasus.