A data reader includes: a memory card interface communicating with a memory card
in which is recorded data such as video, the recorded date of that data, and a
reproduction time limit of that data; a real time clock detecting the current date;
a display unit reading out data from the memory card to display video or the like;
and a CPU comparing the current date detected by the real time clock with the recorded
date and reproduction time limit of the data recorded in the memory card to determine
whether reproduction of the data recorded in the memory card is allowed or not.
