| 摘要 |
A system for approving transaction card transactions in which a card reader associated with a transaction approving authority (TAA). A source for complementary security data is linkable to the TAA can send data to the TAA, and a database linkable to the TAA keeps renewable security data of a user. A database linkable to the TAA keeps records of geographical locations of subscribed businesses. The system of the invention is applicable as a countermeasure against identity theft.
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