Apparatus for storage of data; chip cards, smart cards, plastic cards (credit cards), scratch cards, prepaid cards, cards with magnetic stripe as well as data storage cards of varying formats, in particular those in credit card format; reading devices for the aforementioned chip cards and data storage cards; RFID readers; RFID transponders and RFID cards; biometric readers; computer programs in connection with the operation and the use of the aforementioned goods.