Patent ID: 7092911
Filing Date: 2006-08-15
Classification: G06F,G06Q,G11B,G11C

Abstract:
1. A reproducing apparatus for reproducing data from a record medium having a program area and a management area, the program area being used for recording a plurality of files, the management area being used for recording management data of a particular file recorded in the program area, the apparatus comprising: calculating means for generating a group integrity check value for said file when said file is reproduced; storing means for storing said group integrity check value generated by said calculating means; comparing means operable when a record medium is re-attached to said reproducing apparatus for reproducing data, controlling means for permitting a file corresponding to the current reproduction command to be reproduced, and transferred to the record medium when said comparing means determines that said former group integrity check value is the same as said current group integrity check value, and that said value of the at least one individual parameter coincides with the corresponding value of that parameter stored in the reproducing apparatus; wherein said group integrity check value is generated from a group of management information of a plurality of files; wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and wherein said at least one individual parameter is a reproduction start time value stored on the record medium.