RFID (Radio Frequency ID) chips are slowly being rolled out and will eventually replace the bar-code. Here's a little representation of how it can eventually affect our personal liberties.
For more information, I highly recommend the book "Spychips" by Katherine Albrecht.
Here are a pair of patents which you can google yourself:
Patent#20020165758: IBM - IDENTIFICATION AND TRACKING OF PERSONS USING RFID-TAGGED ITEMS.
Patent#6659344: NCR - AUTOMATED MONITORING OF ACTIVITY OF SHOPPERS IN A MARKET.
URL = http://www.youtube.com/watch?v=FVmD4iTXRLE
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