Method and apparatus for preventing data copying from a disk using data lengths too large for a pirate medium
First Claim
1. A data recording method for recording data on a disk shaped recording medium comprising the steps of:
- (a) making recording data which satisfies a relationship expressed as M≧
W≧
D whereM is a maximum recordable data length defined by a standard of a first disk shaped recording medium,W is a data length of the recording data to be recorded on the first disk shaped recording medium, andD is a data length of effective data which is effective on access; and
(b) recording the recording data made in step (a) on the first disk shaped recording medium,wherein the recording data made in step (a) has a relationship of W>
m, where m is a maximum recordable data length of a second disk shaped recording medium that is associated with the first disk shaped recording medium.
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Accused Products
Abstract
Recording data is recorded on a CD-ROM so as to satisfy a relationship expressed as W≧D and W>m where W is the data length of recording data recorded on the CD-ROM, D is the data length of effective data useful for being accessed (system area, file groups selected when data is edited and retrieval data such as volume descriptor, path table and directory) and m is the maximum recordable data length of a blank disk of a CD-ROM to which data recorded on the CD-ROM is copied. Then, when the relationship between the recording data length W and the effective data length D is expressed by W>D, said recording data contains randomly quasi-data useless for being accessed. Further, a part (e.g., path table) of the retrieval data is arranged at the end of the recording data upon recording. Thus, an illegal copy from the CD-ROM to a blank disk becomes substantially useless, thereby making it possible to effectively protect a copyright of the CD-ROM.
66 Citations
21 Claims
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1. A data recording method for recording data on a disk shaped recording medium comprising the steps of:
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(a) making recording data which satisfies a relationship expressed as M≧
W≧
D whereM is a maximum recordable data length defined by a standard of a first disk shaped recording medium, W is a data length of the recording data to be recorded on the first disk shaped recording medium, and D is a data length of effective data which is effective on access; and (b) recording the recording data made in step (a) on the first disk shaped recording medium, wherein the recording data made in step (a) has a relationship of W>
m, where m is a maximum recordable data length of a second disk shaped recording medium that is associated with the first disk shaped recording medium. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A data recording apparatus for recording data on a disk shaped recording medium comprising:
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recording data making means for making recording data which satisfies a relationship expressed as M≧
W≧
D whereM is the maximum recordable data length defined by the standard of a first disk shaped recording medium, W is the data length of recording data which is to be recorded on the first disk shaped recording medium, and D is the data length of effective data which is effective on access; and recording means for recording the recording data made by the recording data making means on the first disk shaped recording medium, wherein the data making means makes the recording data have a relationship of W>
m where m is a maximum recordable data length of a second data recordable disk shaped recording medium associated with the first disk shaped recording medium. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A disk shaped recording medium, wherein recording data which satisfies a relationship expressed as M≧
- W≧
D is recorded whereM is the maximum recordable data length defined by the standard of the disk shaped recording medium, W is the data length of recording data which is to be recorded on the disk shaped recording medium, and D is the data length of effective data which is effective on access, wherein the recording data satisfies a relationship of W>
m, wherein m is a maximum recordable data length of a different data recordable disk shaped recording medium which is associated with the disk shaped recording medium. - View Dependent Claims (14, 15)
- W≧
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16. A computer system including a first storage device for reproducing information data from a first disk shaped recording medium, a second storage device for recording information data on a second disk shaped recording medium and control apparatus for controlling the first and second storage devices, the computer system comprising:
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data length detection means for detecting a data length W of information data recorded on the first disk shaped recording medium; detection means for detecting whether the data length W is longer than a maximum recordable data length m determined by standards for the second disk shaped recording medium; and copy restricting means for restricting information data recorded on the first disk shaped recording medium from being copied to the second disk shaped recording medium when the detection means determines W>
m. - View Dependent Claims (17, 18)
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19. A data copy preventing method for preventing information data having a recording data length W recorded on a first disk shaped recording medium from being copied to a second disk shaped recording medium having a maximum recordable data length m, the data copy preventing method comprising the steps of:
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comparing the recording data length W and the maximum recordable data length m; and restricting the information data recorded on the first disk shaped recording medium from being copied onto the second disk shaped recording medium when a comparison result is W>
M. - View Dependent Claims (20, 21)
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Specification