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Originally Posted by SMHarman
So thus far the analagy stands but the difference is the opt in or opt out aspect at a transactional level. Not the fact you are passing transactional data.
Though the supermarket sends you tailored offers and decides shop layout and promotional advertising that will appear in your store based on this data. You could say the store is doing it's best to shove ads in your face as you walk around. Wait until Tesco change their cards from barcode cards to RFID cards that will be read as you walk around the store.
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Agreed, that swapping the cards to RFID based would be slightly more invasive, but you stilll have to both opt-in in the first place and also physically opt in by taking the card into the store every time.