An additional barrier imposed under the 2006 rules shut off the main method by which Chinese entrepreneurs and foreign investors had worked around the rules: so-called round-trip investment.

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The California-Colorado method is a way to get around this formidable barrier.

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The method LG uses to accomplish this effect is called "switchable barrier, " which is similar to how Nintendo's 3DS can do 3-D without requiring the player to wear glasses.

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Any attempt to erect a one-time, rigid barrier between thieves and content, he says, is useless, including the current method pushed through by the Japanese consumer electronics companies.

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Mr Broughton said his boss, John Eardley, rang him a week after Mr Farr's death to ask him to retrospectively sign a method statement, a risk assessment and a computer-aided drawing of the barrier's construction.

BBC: Last Updated: Monday, 6 March 2006, 19:55 GMT