Information recording medium, data structure, and data reproducing method
AssigneePioneer Corporation
InventorKazuo KURODA
Life of this patent
Estimating the term…
Abstract
Content data (11), handling limit data (12), and a check program (13) are provided in a data group (10) recorded on an information recording medium (1). The check program (13) causes a reproducing device to read the content data so as to make the reproducing device function as a check device for checking the data state of the handling limit data. Thus, when the handling limit data (12) is tampered, the check program (13) is executed by the reproducing device to find the tamper.
Claims9
1-10. (canceled)
An information recording medium on which a data group is recorded,
- the data group including:
- content data;
- handling control data for indicating whether or not the content data is encrypted;
- and
- a check program for making a reproducing apparatus function as a check apparatus, which checks a state of the handling control data to thereby check whether or not the encrypted content data is illegally decoded, by reading the check program into the reproducing apparatus for reproducing the content data.
A data reproducing method of reproducing data by a reproducing apparatus, the data comprising:
- content data;
- handling control data for indicating whether or not the content data is encrypted;
- and a check program for making the reproducing apparatus function as a check apparatus, which checks a state of the handling control data to thereby check whether or not the encrypted content data is illegally decoded, by reading the check program into the reproducing apparatus for reproducing the content data, the data having a structure in which one group is formed, the content data, the handling control data, and the check program being grouped on the same memory area in the one group, said data reproducing method comprising:
- a check program reading process of reading the check program into the reproducing apparatus;
- a handling control data reading process of reading the handling control data into the reproducing apparatus;
- and
- an executing process of executing the check program by using the reproducing apparatus,
- the executing process (a) judging whether or not the handling control data is in a predetermined state, in accordance with the check program, and (b) restricting, stopping, or forbidding the reproduction of the content data if the handling control data is not in the predetermined state on the basis of a result of the judgment.
Dependencies are inferred from the claim text.