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The public wants access. The security chiefs need to protect the royals and key government leaders. How do they strike the balance?

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London police officers carry out security checks on drains and lamp posts along the Mall ahead of the April 29, 2011, Royal Wedding.Anthony Devlin/Getty Images

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London police officers carry out security checks in advance of the Royal Wedding, April 29, 2011.POOL/Reuters

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British police officers carry out security checks on the media stand outside the Queen Elizabeth II Centre in central London, prior to the Royal Wedding on April 29, 2011.LEON NEAL/AFP / Getty Images

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London police officers carry out security checks on traffic lights along the Mall ahead of the Royal Wedding on April 29, 2011.Anthony Devlin/Getty Images

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Similar security issues existed at the G20 summit last June in Toronto. Here, police in riot gear stand on University Avenue at College Street in advance of a protest.Fernando Morales/The Globe and Mail

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RCMP Constable Todd Abram and his partner, drug sniffing dog Atos patrol at Vancouver International Airport in Richmond, B.C., just prior to the opening of the 2010 Winter Olympics.DARRYL DYCK/The Canadian Press

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