Data recording method and apparatus, data record medium and data reproducing method and apparatus
Patent 5901127 Issued on May 4, 1999. Estimated Expiration Date: 
March 24, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 24, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApparatus for recording/reproducing optical information on/from optical card Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium Optical recording medium, reproducing system, method of reproducing optical disk, method of fabricating optical disk original record, and method of stopping illegal program operation Patent #: 5807640 InventorsAssigneeApplicationNo. 793755 filed on 03/24/1997US Classes:369/59.24, During storage369/275.3Track data format/layoutExaminersPrimary: Edun, MuhammadAttorney, Agent or FirmForeign Patent References
International ClassG11B 007/00Foreign Application Priority Data1995-06-30 JPAbstractAn input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit 15, an error correction encoding circuit 16, a modulation circuit 18 and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure. | |
