System and method for enabling users to interact in a virtual space

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1answer
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How specific must prior art be to invalidate a patent?

Following on from #191, I looked at http://www.google.com/patents/US8082501. - "System and method for enabling users to interact in a virtual space" This was granted in Nov 2009 and claims: 1. A ...
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Enabling Users to Interact in a Virtual Space (Worlds Inc) - Issued Patent - PRIOR ART REQUEST

As an example back around April a company called World Inc. started suing major video game companies like Blizzard, regarding patents 8,082,501, 7,493,558, 7,945,856 and 7,181,690 "System and Method ...