An MM code (the "MM" being an abbreviation for the German "Moduliertes Merkmal") is a "machine-readable modulated" feature that has been added to German debit cards during manufacture as an anti-counterfeiting measure since 1979. It was developed by "Gesellschaft für Automation und Organisation" (a subsidiary of Giesecke & Devrient) in Munich for the German ec-Card system and MM verification devices have been added to German ATMs from 1982 onwards.
An MM code (the "MM" being an abbreviation for the German "Moduliertes Merkmal") is a "machine-readable modulated" feature that has been added to German debit cards during manufacture as an anti-counterfeiting measure since 1979. It was developed by "Gesellschaft für Automation und Organisation" (a subsidiary of Giesecke & Devrient) in Munich for the German ec-Card system and MM verification devices have been added to German ATMs from 1982 onwards.
Source: Wikipedia "MM code" · CC BY-SA 4.0
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