For Metro Group, it was a double whammy. Last February, the German mega-retailer managed to stir up controversy involving two technologies that have made supermarkets the focus of consumer privacy concerns: loyalty cards and RFID (radio frequency identification). At its Future Store, an Extra Supermarket noted for its many consumer-oriented technology applications, Metro embedded an RFID microchip in its loyalty card simply to enable shoppers to trigger age-restricted movie trailers in the ...

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