| 摘要 |
An object of the invention is to prevent original high quality contents data from being illegally obtained by extracting encryption breaking information from data transmitted through a single signal line for connecting two apparatuses and by using the encryption breaking information to decrypt encrypted contents data. In a contents data transmission/reception system, a contents data transmitter encrypts contents data by using key information, transmits the key information through plural signal lines to a contents data receiver, and then, transmits the encrypted contents data through the plural signal lines to the contents data receiver. The contents data receiver acquires the key information from data transmitted from the contents data transmitter through the plural signal lines, receives the encrypted contents data transmitted from the contents data transmitter through the plural signal lines, and decrypts the encrypted contents data by using the key information.
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