Fans will be allowed into the Olympic complex if they are drinking Avra, a Greek mineral water owned by Coca-Cola, which paid $60 million US for the privilege of being one of the main sponsors. Officials are under orders not to let in rival brands' bottles unless the labels are removed.
Staff will also be on the lookout for T-shirts, hats and bags displaying the unwelcome logos of non-sponsors. Stewards have been trained to detect people who may be wearing merchandise from the sponsors' rivals in the hope of catching the eyes of television audiences. Those arousing suspicion will be required to wear their T-shirts inside out.
Known as the "clean venue policy," the rules were drawn up by the Greeks and the International Olympic Committee (IOC) to shield sponsors from so-called "ambush marketing" - an attempt to advertise items during the games without paying sponsorship fees.
