Optical information recording medium, optical information recording method, and optical information reproducing apparatus utilizing the same

An optical information reproducing apparatus for reproducing information recorded on an optical information medium including at least one track formed in a surface of a disc-shaped substrate in one of a spiral form and a concentric form, the track including a plurality of sectors arranged successively, and the plurality of sectors each storing information in the state of being scrambled based on an initial value in accordance with a value of identification information for identifying a position of the sector, the optical information reproducing apparatus comprising:

• demodulation means for demodulating a signal reproduced from the optical information medium and generating a demodulation signal;
• error correction means for correcting an error included in the demodulation signal and generating the corrected information;
• identification information reading means for reading the identification information from the corrected information;
• initial value generation means for generating a value corresponding to the identification information read by the identification information reading means;
• descramble signal generation means for generating a signal for descrambling, using the value generated by the initial value generation means as the initial value;
• and
• descrambling means for descrambling the corrected information based on the signal generated by the descramble signal generation means.

An optical information reproducing apparatus for reproducing information recorded on an optical information medium including at least one track formed in a surface of a disc-shaped substrate in one of a spiral form and a concentric form, the track including a plurality of sectors arranged successively, each of the plurality of sectors including a plurality of information regions, one of the information regions including a sector address region containing address information and a data region containing user data that are distinct from the address information, the remaining respective information regions including only the data region containing at least one of the user data and parity data, the user data contained in the data regions being sequentially-stored information obtained as a result of scrambling which is performed through conversion of a value of a binary data indicating the user data based on an initial value obtained in accordance with a value of identification information for identifying a position of the sector, the apparatus comprising:

• demodulating means for demodulating a signal reproduced from the optical information medium and generating a demodulation signal;
• identification information reading means for reading the identification information from the demodulation signal;
• initial value generation means for generating a value corresponding to the identification information read by the identification information reading means;
• descramble signal generation means for generating a signal for descrambling, using the value generated by the initial value generation means as the initial value;
• and
• descrambling means for descrambling the demodulation signal based on the signal generated by the descramble signal generation means.