Revocation information updating method, revocation information updating apparatus and storage medium
First Claim
1. A revocation information updating method for updating revocation information on a storage medium, the storage medium (1) being capable of recording and playing back a digital content when used by an electronic appliance having at least one of a function for playing back a digital content and a function for recording a digital content and (2) storing, in advance, revocation information that is used to judge which electronic apparatuses should be prevented from using the storage medium in order to protect digital contents, the revocation information updating method comprising:
- (a) a recording step for recording master revocation information, which is judgeable by revocation information updating apparatuses, in advance into a special storage region provided on the storage medium;
(b) a determining step for determining, based on the master revocation information, whether the revocation information on the storage medium can be updated by a revocation information updating apparatus into which the storage medium has been inserted;
(c) an updating step for updating the revocation information, depending on a determination made in the determining step.
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Abstract
At least one set of revocation information for identifying electronic appliances that should be revoked for content protection and master revocation information for identifying electronic appliances that have special permission to update the revocation information are recorded in advance into a special storage region on a storage medium. When the storage medium is loaded into an electronic appliance indicated by the master revocation information, the revocation information can be updated. However, when the storage medium is loaded into an electronic appliance indicated by the revocation information, the electronic appliance is revoked and so the protection of contents is improved.
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Citations
15 Claims
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1. A revocation information updating method for updating revocation information on a storage medium, the storage medium (1) being capable of recording and playing back a digital content when used by an electronic appliance having at least one of a function for playing back a digital content and a function for recording a digital content and (2) storing, in advance, revocation information that is used to judge which electronic apparatuses should be prevented from using the storage medium in order to protect digital contents,
the revocation information updating method comprising: -
(a) a recording step for recording master revocation information, which is judgeable by revocation information updating apparatuses, in advance into a special storage region provided on the storage medium;
(b) a determining step for determining, based on the master revocation information, whether the revocation information on the storage medium can be updated by a revocation information updating apparatus into which the storage medium has been inserted;
(c) an updating step for updating the revocation information, depending on a determination made in the determining step.
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2-4. -4. (canceled)
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5. A storage medium that is capable of recording and playing back a digital content when used by an electronic appliance having at least one of a function for playing back a digital content and a function for recording a digital content, the storage medium comprising:
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a special storage region in which master revocation information for identifying revocation information updating apparatuses is recorded in advance;
a judging means for judging, when the storage medium is loaded into a revocation information updating apparatus, whether the revocation information updating apparatus is permitted to update revocation information present on the storage medium, based on the master revocation information;
an updating means for updating the revocation information, depending on the judgement made by the judging means.
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6. (canceled)
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7. A revocation information updating method for having a revocation information updating apparatus update revocation information recorded on a recording medium, the revocation information updating apparatus being permitted to perform updating, the revocation information including information on an electronic device which is cancelled permission for recording digital contents onto the recording medium or for reproducing digital contents recorded on the recording medium, the revocation information updating method comprising:
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a recording step of pre-recording master revocation information on a predetermined area allocated in the recording medium, the master revocation information including information on a revocation information updating apparatus which has been cancelled permission to update revocation information;
a judging step of, upon detecting the recording medium being inserted to the revocation information updating apparatus, judging whether updating is permitted to the revocation information updating apparatus, based on information on the revocation information updating apparatus that the revocation information updating apparatus has; and
an updating step of
1) having the inserted revocation information updating apparatus update the revocation information, when the updating is judged to be permitted, and
2) prohibiting the revocation information updating apparatus from updating the revocation information, when the updating is not judged to be permitted. - View Dependent Claims (8, 9)
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10. A revocation information updating apparatus which is permitted to update revocation information recorded on a recording medium, the revocation information including information on an electronic device which is cancelled permission for recording digital contents onto the recording medium or for reproducing digital contents recorded on the recording medium, the recording medium having an area in which master revocation information is pre-recorded, the master revocation information including a revocation information updating apparatus which has been cancelled permission to update revocation information, the revocation information updating apparatus comprising:
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a judging means for, upon detecting the recording medium being inserted to the revocation information updating apparatus, judging whether updating is permitted to the revocation information updating apparatus, based on information on the revocation information updating apparatus that the revocation information updating apparatus has; and
an updating means for
1) having the inserted revocation information updating apparatus update the revocation information, when the updating is judged to be permitted, and
2) prohibiting the revocation information updating apparatus from updating the revocation information, when the updating is not judged to be permitted. - View Dependent Claims (11, 12)
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13. A recording medium storing revocation information which is updated by a revocation information updating apparatus, the revocation information updating apparatus being permitted to perform updating, the revocation information including information on an electronic device which is cancelled permission for recording digital contents onto the recording medium or for reproducing digital contents recorded on the recording medium, the recording medium comprising:
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a recording means for pre-recording master revocation information on a predetermined area allocated in the recording medium, the master revocation information including information on a revocation information updating apparatus which has been cancelled permission to update revocation information;
a judging means for, upon detecting the recording medium being inserted to the revocation information updating apparatus, judging whether updating is permitted to the revocation information updating apparatus, based on information on the revocation information updating apparatus that the revocation information updating apparatus has; and
an updating means for
1) having the inserted revocation information updating apparatus update the revocation information, when the updating is judged to be permitted, and
2) prohibiting the revocation information updating apparatus from updating the revocation information, when the updating is not judged to be permitted. - View Dependent Claims (14, 15)
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Specification