Information recording method and apparatus, information recording medium, and information recording medium manufacturing method and apparatus

An information recording apparatus for recording downloaded data downloaded from a server on a recordable optical disc and thereby providing an information recording medium reproducible by a reproducing apparatus for a prescribed playback-only optical disc, the downloaded data comprising control information including a content encryption key and content information including data encrypted using the encryption key, the information recording apparatus comprising:

• a recording apparatus for recording the downloaded data downloaded from the server on the recordable optical disc;
• and
• a communication and control apparatus for making the recording apparatus record the content information in a first prescribed position on the recordable optical disc and record the control information in a second prescribed position on the recordable optical disc after the content information has been recorded;
• wherein
• the communication and control apparatus
• selects a shift value for shifting the first prescribed position within a prescribed range with respect to physical addresses of an area in which the content information is recorded in the playback-only optical disc, temporarily stores the selected shift value in a memory in the information recording apparatus, and causes the content information to be recorded in the first prescribed position determined by the selected shift value,
• determines the second prescribed position as a position shifted by an amount identical to the temporarily stored shift value with respect to physical addresses of an area in which the control information is recorded in the playback-only optical disc, and causes the control information to be recorded in the second prescribed position, and
• deletes the temporarily stored shift value from the memory after the optical disc is removed from the recording apparatus once the recording of the content information has started.

An information recording method for recording data, transferred for recording by an information terminal device, on a recordable optical disc by means of a recording apparatus with which the information terminal device is equipped, and thereby providing an information recording medium reproducible by a reproducing apparatus for a prescribed playback-only optical disc, the data comprising control information including a content encryption key and content information including data encrypted using the encryption key, the information recording method comprising:

• a first step of recording the content information in a first prescribed position on the recordable optical disc;
• a second step of recording the control information in a second prescribed position on the recordable optical disc, after the first step;
• the first step having
• a substep of selecting a shift value for shifting the first prescribed position within a prescribed range with respect to physical addresses of an area in which the content information is recorded in the playback-only optical disc,
• a substep of temporarily storing the selected shift value in the information terminal device, and
• a substep of recording the content information in the first prescribed position determined by the selected shift value;
• the second step determining the second prescribed position as a position shifted by an amount identical to the temporarily stored shift value with respect to physical addresses of an area in which the control information is recorded in the playback-only optical disc, and recording the control information in the second prescribed position;
• and
• a step of deleting the temporarily stored shift value after the optical disc is removed from the recording apparatus once the first step of recording has started.

An information recording apparatus for recording data transferred for recording on a recordable optical disc and thereby providing an information recording medium reproducible by a reproducing apparatus for a prescribed playback-only optical disc, the data comprising control information including a content encryption key and content information including data encrypted using the encryption key, the information recording apparatus comprising:

• a recording apparatus for recording the data transferred for recording on the recordable optical disc;
• and
• a communication and control apparatus for making the recording apparatus record the content information in a first prescribed position on the recordable optical disc and record the control information in a second prescribed position on the recordable optical disc after the content information has been recorded;
• wherein
• the communication and control apparatus
• selects a shift value for shifting the first prescribed position within a prescribed range with respect to physical addresses of an area in which the content information is recorded in the playback-only optical disc, temporarily stores the selected shift value in a memory in the information recording apparatus, and causes the content information to be recorded in the first prescribed position determined by the selected shift value,
• determines the second prescribed position as a position shifted by an amount identical to the temporarily stored shift value with respect to physical addresses of an area in which the control information is recorded in the playback-only optical disc, and causes the control information to be recorded in the second prescribed position, and
• deletes the temporarily stored shift value from the memory after the optical disc is removed from the recording apparatus once the recording of the content information has started.