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This is the entrance to the Moscone Center in San Francisco, where the world's biggest security conference is taking place this week.
RSA Conference 2007 has attracted big names such as Bill Gates and Larry Ellison (although illness prevented Ellison appearing), with other top executives from across the industry also speaking.
The show is also hearing from those at the sharp end of the security landscape — the researchers battling virus writers, hackers and organised cybercriminals.
Photo credit: Graeme Wearden