| 摘要 |
A method for accessing a selected group of data which is stored on a machine readable storage medium, which method includes: assigning a first identifying designation to the storage medium; assigning a second identifying designation to a machine which can read the storage medium; assigning a third identifying designation to the selected group of data; obtaining an access code which is a function of the first, second and third identifying designations; inputting the access code into the machine; and processing the access code in the machine for receiving the third identifying designation. A data processing system including: a data storage medium storing a plurality of groups of data and a machine readable first identifying designation which identifies the storage medium; and a machine composed of components for reading the storage medium, storing a machine readable second identifying designation which identifies the machine, inputting a code uniquely associated with the first and second identifying designations and with at least one selected group of stored data, and accessing data stored on the storage medium in response to inputting of the code.
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