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A signature. we think there's some sort of legitimacy to signing a receipt. in reality, it's not a good form of security. >> reporter: signature authentication has been replaced by technology. unusual spending patterns and transaction locations are red flags. some retailers say more needs to be done to he prevent fraud and want u.s. credit cards, much like those in europe, to require the use of a p.i.n. >> the reason it's effective is it in theory only you know your p.i.n. even if a credit card is stolen, there's nothing on that card that indicates what the p.i.n. is. >> reporter: the credit c...

We think that we assign value to a signature. we think there's some sort of legitimacy to signing a receipt. in reality, it's not a good form of security. >> reporter: signature authentication has been replaced by technology. unusual spending patterns and transaction locations are red flags. some retailers say more needs to be done to he prevent fraud and want u.s. credit cards, much like those in europe, to require the use of a p.i.n. >> the reason it's effective is it in theory only you know your p.i.n. even if a credit card is stolen, there's nothing on that card that indicates what the p.i...

Experts say dropping the signature has long been overdue. >> it is a tradition. we think that we assign value to a signature and think there is some sort of legitimacy to signing a receipt. in reality it's not a good form of security. >> instead of signatures technology is being used to detect fraud. unusual spending patterns and transactions could be a red flag. the national retail federation want to enhance security and require pins on all credit card purchases. so far, though, the industry has been resisting that raising the concern about cost and the fact that consumers might not easily ad...

Signature. >> it's the end of an era. one that few people seem to notice. beginning this month, signatures will no longer be required when using a security chip enabled credit card. phasing out signatures gradually began two years ago when chip technology was introduced. the use of chip cards significantly reduced fraud because they are difficult or counterfeit. many merchants and the credit card industry say signature authentication, which has been used for decades, increased waiting time of the cash register and did little to prevent unauthorized transactions. >> it is somewhat of a traditio...

Way in which they track us and we have questions about privacy and questions about whether there too big and wield too much power. >> google, facebook, amazon, apple and microsoft are the five big companies that make up big tech. today, they own the market. consider in 2004, google's market share was just 35%. today under parent company that it is 87% in the us. >> i think they are creating some sort of domination of only one source to go to. no one thanks about yahoo but everyone about google. >> he wonders with that market power can compete. >> when google collects all the data on this it gi...