DATA BROADCAST SYSTEM AND DATA RECEIVER

摘要

PURPOSE:To conduct flexible imposition. CONSTITUTION:A service operation company 3 sends data ciphered with a key different from each kind. A data receiver 6 receives the sent data and records the data to a magneto-optical disk 8. Then the recorded data are decoded by using a key. Then charging control is conducted based on the kind of decoded data (discriminated by using a key used for decoding) and the data quantity.