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AssigneeNone recorded
InventorsMasaki Yonekawa, Takuma Hirayoshi, Hirotoshi Ohno, Hiroyoshi Yoshikawa, Nobuchika Ochi
Estimating the term…
An apparatus for preventing unauthorized reading/execution which does not necessarily requires such an extra storage region, but controls adverse effects to operating environment such as OS or the like, and contribute to restricting diffusion or distribution of unauthorized copies. An original CD-ROM readable by a driver stores original data, which in part contains modified data of a different value from a predetermined value to be generated by the driver. A copied CD-ROM stores copied data of the original data, and data of such predetermined value as generated by the driver at a time of making the copy. To prevent execution of data that is to be read by the driver, an apparatus for preventing unauthorized reading/execution 181 is provided with a modified data detecting unit 182 capable of detecting modified data from the data stored in the original CD-ROM or the copied CD-ROM, and a copied CD-ROM performing unit 195 for preventing execution of data by read-out of the driver, in response to failure of detecting the modified data by the modified data detecting unit 182.
A data modifying apparatus for modifying original data to be recorded in an original recording medium, so as to prevent execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded, said data modifying apparatus comprising:
A method for preparing modified data, modifying original data to be recorded in an original recording medium so as to prevent execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded;
A method for recording original data in an original recording medium, so as to prevent execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy of said original recording medium by said reading means, are recorded, said method comprising the steps of:
An original recording medium, so as to prevent execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy of said recording medium by said reading means, are recorded;
An apparatus for preventing unauthorized reading/execution of data, so as to prevent execution of data that is read out by reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded, wherein an original recording medium to be read out by said reading means holds recorded original data which in part contains modified data of a different value from such predetermined value as generated by said reading means, said apparatus comprising:
A method for preventing unauthorized reading/execution of data, so as to prevent reading/execution of data, which is read out by reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded;
A computer program, executed by a computer, for preparing a modified data, said modified data being a part of an original data to be recorded in an original recording medium, so as to prevent execution of data that is read out by a reading means from a copied recording medium, said program comprising the steps of:
A computer program, executed by a computer, for recording original data in an original recording medium, so as to prevent execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy of said original recording medium by said reading means, are recorded, said program comprising the steps of:
A computer program, executed by a computer, for preventing unauthorized reading/execution of data that is read out by a reading means from a copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded, wherein an original recording medium, which is capable of being read out by said reading means, records original data which in part contains modified data of a different value form a predetermined value to be generated by said reading means, said program comprising the steps of;
A computer program, stored in an original recording medium or a copied recording medium, executed by a computer, for preventing unauthorized reading/execution of data that is read out by a reading means from said copied recording medium, in which copied data, and data of a predetermined value to be generated at a time of making the copy by said reading means, are recorded, wherein said original recording medium, which is capable of being read out by said reading means, records original data which in part contains modified data of a different value from such predetermined value as generated by said reading means, said program comprising the steps of;
Dependencies are inferred from the claim text.
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Said format change concerning the logical format of the recording medium, e.g. the structure of sectors, blocks, or frames: wherein the…
Signal processing not specific to the method of recording or reproducing; Circuits therefor: circuits for prevention of unauthorised reproduction…
Involving measures which are linked to media defects or read/write errors: wherein said defects or errors are generated on purpose, e.g. intended…
Information storage based on relative movement between record carrier and transducer
Term end not estimated
1. Field of the Invention
This invention relates to a data modifying apparatus, a modified data preparing method, an original data recording method, a recording medium therefor, an apparatus for preventing unauthorized reading/execution, and, an method for preventing unauthorized reading/execution for preventing execution of data which is read out by reading means from a copied recording medium, in which copied data of the original data, and data of a predetermined value to be generated at a time of making the copy by the reading means, are stored.
1. Description of the Prior Art
The invention will be explained in more detail in conjunction with appended drawings, wherein:
FIG. 1 is a view showing a sub-code structure of a normal CD-ROM.
FIG. 2 is a view showing a structure of a sub-channel Q of FIG. 1.
Referring to drawings, preferred embodiments of the invention will be described below.
FIG. 1 is a view showing a sub-code structure of a normal CD-ROM.
In sectors of the CD-ROM, there exists data of 98 bytes referred to as a sub-code 121. This sub-code 121 comprises synchronization patterns S0 and S1, and 8 sub-channels P to W.