| 摘要 |
A content reproduction apparatus ( 1 ) which reproduces digital contents, including a device key storage unit (110) which holds a device key ( 110 a) specific to the content reproduction apparatus ( 1 ) in a manner which does not allow access from outside the content reproduction apparatus ( 1 ), a device ID storage unit ( 19 ) which holds device key index information ( 19 a) which is in a one-to-one association with a device key ( 110 a), an instruction code receiving unit ( 14 a) which receives an instruction code to output index information, a device key index information obtainment processing unit ( 10 a) which outputs, to outside, the device key index information ( 19 a) stored in the device ID storage unit ( 19 ) based on the instruction, and the device key index information output processing unit ( 11 a).
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