Optical disk, optical disk recording and reproducing apparatus, method for recording, reproducing and deleting data on optical disk, and information processing system

An optical disk of recording type on which data is recordable,

• wherein said optical disk includes a main data area for recording data therein,
• wherein said main data area includes a non-encrypted area for recording data in a non-encrypted status, and an encrypted area for recording data in an encrypted status,
• wherein said non-encrypted area includes decipher key conversion data used for converting a decipher key into a converted decipher key, and
• wherein data in said encrypted area is encrypted by using the converted decipher key.

An optical disk recording method for recording data on an optical disk of recording type on which data is recordable, said method comprising:

• reading out a decipher key status which is recorded on the optical disk, and judging whether or not there is an empty area for a decipher key based on the read-out decipher key status;
• reserving a decipher key area and recording the decipher key in the reserved decipher key area when said judging of whether or not there is the empty area for the decipher key judges that there is the empty area for the decipher key;
• setting copyright control information and a decipher key index in at least one unit of a file unit and an extent unit;
• encrypting data by using the decipher key, and recording the encrypted data on the optical disk in at least one unit of a file unit and an extent unit;
• and
• recording optical disk file management information on the optical disk for managing data which is recorded on the optical disk.

An information processing system comprising:

• a data encrypting apparatus for encrypting data by using a cipher key;
• an optical disk recording and reproducing apparatus for recording a decipher key which is required for decrypting data on an optical disk of recording type, and for reproducing the recorded decipher key;
• and
• a control apparatus connected to said optical disk recording and reproducing apparatus and the data encrypting apparatus;
• wherein said optical disk recording and reproducing apparatus comprises
• first recording and reproducing means for recording a decipher key table on the optical disk, and for reproducing the decipher key table from the optical disk,
• encrypting and decrypting means for
• encrypting the decipher key,
• transmitting the encrypted decipher key,
• receiving the encrypted decipher key from said control apparatus, and
• decrypting the encrypted decipher key, and
• second recording and reproducing means for recording a decipher key status table for indicating a recorded status of the decipher key on the optical disk, and for reproducing the decipher key status table from the optical disk;
• wherein said data encrypting apparatus comprises encrypting means for encrypting the decipher key, and for transmitting the encrypted decipher key to said control apparatus;
• and
• wherein said control apparatus comprises
• receiving means for receiving the encrypted decipher key from said encrypting means of said data encrypting apparatus, and
• allocating means for searching for an empty area for the decipher key based on the reproduced decipher key status table, for allocating the received and encrypted decipher key into the searched empty area, and for transmitting the allocated and encrypted decipher key to said optical disk recording and reproducing apparatus, and
• wherein said encrypting and decrypting means of said optical disk recording and reproducing apparatus receives the allocated and encrypted decipher key from said allocating means of said control apparatus, and decrypts the received encrypted decipher key.

An information processing system comprising:

• an optical disk reproducing apparatus for reproducing a decipher key table comprising data and a plurality of decipher keys which are required for decrypting data from an optical disk of recording type;
• a control apparatus connected to said optical disk reproducing apparatus;
• and
• a data decrypting apparatus for decrypting data by using the plurality of decipher keys,
• wherein said optical disk reproducing apparatus comprises
• first reproducing means for reproducing the decipher key table from the optical disk,
• encrypting means for encrypting the reproduced decipher key table, and for transmitting the encrypted decipher key table to said control apparatus, and
• second reproducing means for reproducing a decipher key status table for indicating recorded statuses of the plurality of decipher keys from the optical disk;
• wherein said control apparatus comprises
• receiving means for receiving the encrypted decipher key table from said optical disk reproducing apparatus, and
• searching means for searching for the encrypted decipher key which is required for decrypting data that is recorded on the optical disk from the received decipher key table based on the reproduced decipher key status table, and for transmitting the searched encrypted decipher key to said data decrypting apparatus;
• and
• wherein said data decrypting apparatus comprises
• first decrypting means for decrypting the encrypted decipher key, and for producing the decrypted decipher key, and
• second decrypting means for decrypting the encrypted data by using the decrypted decipher key,
• wherein said optical disk reproducing apparatus reproduces the encrypted data which is decrypted by said second decrypting means.

An optical disk recording method for recording data in an optical disk of recording type on which data is recordable,

• wherein said optical disk includes a non-encrypted area and an encrypted area, and
• wherein said method comprises;
• recording, in a non-encrypted status, data including decipher key conversion data used for converting a decipher key into a converted decipher key in the non-encrypted area;
• and recording encrypted data in the encrypted area, wherein the encrypted data is encrypted by using the converted decipher key.

An optical disk reproducing method for reproducing data from an optical disk in which data is recordable,

• wherein the optical disk includes a non-encrypted area and an encrypted area, and
• wherein said method comprises:
• converting a decipher key into a converted decipher key by using decipher key conversion data which is recorded in the non-encrypted area;
• decrypting data which is recorded on in the encrypted area by using the converted decipher key;
• and
• reproducing the decrypted data.

An information processing system comprising:

• a data encrypting apparatus operable to encrypt data by using a cipher key;
• an optical disk recording and reproducing apparatus operable to reproduce a decipher key which is required for decrypting data on an optical disk of recording type, and to reproduce the recorded decipher key;
• and
• a control apparatus connected to said optical disk recording and reproducing apparatus and said data encrypting apparatus;
• wherein said optical disk recording and reproducing apparatus comprises
• a first recording and reproducing unit operable to record a decipher key table on the optical disk, and to reproduce the decipher key table from the optical disk,
• an encrypting and decrypting unit operable to
• encrypt the decipher key,
• transmit the encrypted decipher key,
• receive the encrypted decipher key from said control apparatus, and
• to decrypt the encrypted decipher key;
• and
• a second recording and reproducing unit operable to record a decipher key status table for indicating a recorded status of the decipher key on the optical disk, and to reproduce the decipher key status table from the optical disk;
• wherein said data encrypting apparatus comprises an encrypting unit operable to encrypt the decipher key, and to transmit the encrypted decipher key to said control apparatus;
• and
• wherein said control apparatus comprises
• a receiving unit operable to receive the encrypted decipher key from said encrypting unit of said data encrypting apparatus, and
• an allocating unit operable to search for an empty area for the decipher key based on the reproduced decipher key status table, to allocate the received and decipher key into the searched empty area, and to transmit the allocated and encrypted decipher key to said optical disk recording and reproducing apparatus, and
• wherein said encrypting and decrypting unit of said optical disk recording and reproducing apparatus is operable to receive the allocated and encrypted decipher key from said allocating unit of said control apparatus, and to decrypt the received encrypted decipher key.

An information processing system comprising:

• an optical disk reproducing apparatus operable to reproduce a decipher key table comprising data and a plurality of decipher keys which are required for decrypting data from an optical disk of recording type;
• a control apparatus connected to said optical disk reproducing apparatus;
• and
• a data decrypting apparatus operable to decrypt data by using the plurality of decipher keys;
• wherein said optical disk reproducing apparatus comprises
• a first reproducing unit operable to reproduce the decipher key table from the optical disk,
• an encrypting unit operable to encrypt the reproduced decipher key table and to transmit the encrypted decipher key table to said control apparatus, and
• a second reproducing unit operable to reproduce a decipher key status table for indicating recorded statuses of the plurality of decipher keys from the optical disk;
• wherein said control apparatus comprises
• a receiving unit operable to receive the encrypted decipher key table from said optical disk reproducing apparatus;
• and
• a searching unit operable to search for the encrypted decipher key which is required for decrypting data that is recorded on the optical disk from the received decipher key table based on the reproduced decipher key status table, and to transmit the searched encrypted decipher key to said data decrypting apparatus;
• and
• wherein said data decrypting apparatus comprises
• a first decrypting unit operable to decrypt the encrypted decipher key and to produce the decrypted decipher key, and
• a second decrypting unit operable to decrypt the encrypted data by using the decrypted decipher key,
• wherein said optical disk reproducing apparatus is operable to reproduce the encrypted data which is decrypted by said second decrypting unit.

An optical disk recording apparatus for recording data on an optical disk of recording type on which data is recordable,

• wherein said optical disk includes a non-encrypted area and an encrypted area, and
• wherein said optical disk recording apparatus comprises a recording unit operable to
• record data, including decipher key conversion data used for converting a decipher key into a converted decipher key, in the non-encrypted area in a non-encrypted status, and
• record encrypted data in the encrypted area, wherein the encrypted data is encrypted by using the converted decipher key.

An optical disk reproducing apparatus operable to reproduce data from an optical disk of recording type on which data is recordable,

• wherein said optical disk includes a non-encrypted area and an encrypted area, and
• wherein said optical disk reproducing apparatus comprises:
• a reproducing unit operable to
• convert a decipher key into a converted decipher key by using decipher key conversion data which is recorded in said non-encrypted area,
• decrypt data which is recorded in said encrypted area by using the converted decipher key, and
• reproduce the decrypted data.