By Joshua Chaffin in New York and Richard Waters in San Francisco
Wednesday, March 14, 2007
 
Viacom on Tuesday launched the most serious challenge yet to YouTube, suing the Google-owned internet video site for “massive intentional copyright infringement” , asking a federal court for more than $1bn in damages.

The media company is also requesting an injunction against YouTube to prevent it from further infringement, a condition – if granted - that could call into question the site's ability to operate.

Copyright lawyers suggested that the court was unlikely to comply with such a demand.

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