Data Inspection Apparatus, Data Inspection Method And Data Inspection Program

A data inspection method characterized by comprising:

• a step of reading encrypted content data and key data for decryption of the encrypted content data from a recording medium on which at least both the data are recorded;
• a step of decrypting the read content data by using the read key data;
• a step of reading unencrypted content data and comparing the decrypted content data and the unencrypted content data in order to at least detect errors in the decrypted content data;
• a step of generating data representative of a result of the comparison;
• a step of storing information representative of a level of secrecy of the decrypted content data and information representative of a level of secrecy of the generated comparison result data in such a manner as to associate the respective levels of secrecy with the decrypted content data and the comparison result data;
• and
• a step of encrypting the decrypted content data and the comparison result data according to the respective levels of secrecy.

A data inspection program which causes a computer to execute:

• a step of reading encrypted content data and key data for decryption of the encrypted content data from a recording medium on which at least both the data are recorded;
• a step of decrypting the read content data by using the read key data;
• a step of reading unencrypted content data and comparing the decrypted content data and the unencrypted content data in order to at least detect errors in the decrypted content data;
• a step of generating data representative of a result of the comparison;
• a step of storing information representative of a level of secrecy of the decrypted content data and information representative of a level of secrecy of the generated comparison result data in such a manner as to associate the respective levels of secrecy with the decrypted content data and the comparison result data;
• and
• a step of encrypting the decrypted content data and the comparison result data according to the respective levels of secrecy.