| 摘要 |
A distribution system comprising an adding unit adding an electronic sign to a code request by using first key data corresponding to second key data possessed by a managing device to which a code request is sent; a transmitting unit transmitting the code request which the electronic sign generated by the adding unit; a receiving unit receiving encrypted data to be multicast and a code response transmitted in response to the code request; an acquiring unit decrypting decrypting code included in the code response received by the receiving unit and encrypted by third key data, by using fourth key data corresponding to the third key data acquiring the decrypted decrypting data; and a decrypting unit decrypting encrypted data received by the receiving unit by using decrypting data acquire by the acquiring unit and delivering the decrypted data to output unit.
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