write and wiedergabevorrichtung with each data block marked secret informationszahl

摘要

Data are protected by providing a recording device (2) for recording in each of a plurality of data blocks in a card-like recording medium (3) general data to be recorded and data protecting information inhibiting the data from being carelessly read out, a reproducing device (4) for reproducing the data and data protecting information recorded in the recording medium (3) and a data transfer controlling device (5) permitting the data to be read out only in case the input secret information data coincide with the data protecting information recorded in the recording medium (3) in the case of reproducing the data with this reproducing device (4). IMAGE