Apparatus, method, and computer program product for recording content

A content recording method comprising:

• determining, by a processor, whether a copy control information indicates whether or not a title content on a recording medium is free to be copied, the title content being encrypted and including at least one of video data and audio data, such that the title content can be copied without restriction, the copy control information indicating a type of copy restriction on the title content in the recording medium, the copy control information corresponding to the title content, the copy control information being used for decrypting the title content, the recording medium recording thereon the copy control information, one or more title key, the title content encrypted by the title key and the copy control information;
• performing selecting an encryption key for performing an encrypting process to adjunct data from the recording medium, and not performing selecting the encryption key for performing an encryption process to the adjunct data when the copy control information indicates that title content is free to be copied, the adjunct data being generated from a portion of the at least one of video data and audio data that is copied from a plain title content, the plain title content being obtained by decrypting the title content by using a decrypted title key and the copy control information, the decrypted title key being generated by decrypting the title key by using a device secret key;
• performing an encrypting process to the adjunct data by using the encryption key when the copy control information does not indicate that the title content is free to be copied;
• and
• recording the adjunct data to which the encryption process is performed and the encryption key in the recording medium.

A non-transitory computer readable storage medium including programmed instructions for recording content, wherein the instructions, when executed by a computer, cause the computer to perform:

• determining whether a copy control information indicates whether or not a title content on a recording medium is free to be copied, the title content being encrypted and including at least one of video data and audio data, such that the title content can be copied without restriction, the copy control information indicating a type of copy restriction on the title content in the recording medium, the copy control information corresponding to the title content, the copy control information being used for decrypting the title content, the recording medium recording thereon the copy control information, one or more title key, the title content encrypted by the title key and the copy control information;
• performing selecting an encryption key for performing an encrypting process to adjunct data from the recording medium, and not performing selecting the encryption key for performing an encryption process to the adjunct data when the copy control information indicates that title content is free to be copied, the adjunct data being generated from a portion of the at least one of video data and audio data that is copied from a plain title content, the plain title content being obtained by decrypting the title content by using a decrypted title key and the copy control information, the decrypted title key being generated by decrypting the title key by using a device secret key;
• performing an encrypting process to the adjunct data by using the encryption key when the copy control information does not indicate that the title content is free to be copied;
• and
• recording the adjunct data to which the encryption process is performed and the encryption key in the recording medium.

A encrypting apparatus comprising:

• a determining unit that determines whether a copy control information indicates whether or not a title content on a recording medium is free to copied, the title content being encrypted and including at least one of video data and audio data, such that the title content can be copied without restriction, the copy control information indicating a type of copy restriction on the title content in the recording medium, the copy control information corresponding to the title content, the copy control information being used for decrypting the title content, the recording medium recording thereon the copy control information, one or more title key, the title content encrypted by the title key and the copy control information;
• a key selecting unit that performs selecting an encryption key for performing an encrypting process to adjunct data from the title key recorded in the recording medium, and does not perform selecting the encryption key for performing an encrypting process to the adjunct data when the copy control information indicates that the title content is free to be copied, the adjunct data being generated from a portion of the at least one of video data and audio data that is copied from a plain title content, the plain title content being obtained by decrypting the title content by using a decrypted title key and the copy control information, the decrypted title key being generated by decrypting the title key by using a device secret key;
• an encryption processing unit that performs an encrypting process to the adjunct data by using the encryption key when the copy control information does not indicate that the title content is free to be copied;
• and
• an output unit that outputs the adjunct data to which the encryption process is performed and the encryption key to the recording medium.