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Activision head defends Modern Warfare 3 pay service

10 June 2011 Last updated at 15:45 BST

Gaming giant Activision has announced that it will release the next title in the Call of Duty series - Modern Warfare 3 - in November.

Some analysts have said that a new optional service, which charges gamers for extra content, in an attempt by the company to experiment with a new business model they could further implement in the future.