Time-shifted conditional access
First Claim
1. A conditional access system, comprising:
- descrambler means for converting scrambled information into descrambled information depending on control words;
security means for supplying the control words to the descrambler means so that the descrambler means perform the conversion;
means for supplying control word generation data, different from the control words, for recording on a storage media along with the scrambled information;
and generation means for providing the control words depending on the recorded control word generation data when the scrambled information along with the generation data is read from the storage media.
1 Assignment
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Accused Products
Abstract
In a conditional access system, transmitted information is recorded in a scrambled form SV. Accordingly, any access to the recorded information SV is subject to the condition that proper control word(s) CW are available. To enable access to the recorded information SV, control word regeneration data ECM, KRD is stored. The proper control word(s) CW cannot easily be derived from this control word regeneration data ECM, KRD. However security device SCD is capable of retrieving the proper control word(s) CW from the control word regeneration data ECM, KRD. A system operator effectively masters operations carried out in the security device SCD. Accordingly, if the system operator so desires, he may inhibit retrieval of the control word(s) CW and, consequently, prevent access to the recorded information SV. The conditional access system may be used in, for example, pay-TV or multimedia purposes.
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Citations
17 Claims
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1. A conditional access system, comprising:
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descrambler means for converting scrambled information into descrambled information depending on control words; security means for supplying the control words to the descrambler means so that the descrambler means perform the conversion; means for supplying control word generation data, different from the control words, for recording on a storage media along with the scrambled information; and generation means for providing the control words depending on the recorded control word generation data when the scrambled information along with the generation data is read from the storage media. - View Dependent Claims (2, 3, 4, 5, 6, 17)
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7. A security device, comprising:
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means for providing control words to a descrambler for converting scrambled information into descrambled information depending on the control words; and means for supplying control word generation data, that is different than the control words, for recording along with the scrambled information on storage media; and in which the means for providing control words are for providing the control words depending on the control word generation data read from the storage media.
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8. A recording medium, comprising:
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scrambled information; and control word generation means for providing control words to descramble the scrambled information and which are different from the control words.
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9. A method of time-shifted conditional access to scrambled information, comprising:
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providing scrambled information; providing control word generation data; recording the scrambled information along with the control word generation data onto storage media; reading the scrambled information along with the control word generation data from the storage media; supplying the recorded scrambled information to a descrambler; generating control words depending on the control word generation data; supplying the control words to the descrambler; and unscrambling the scrambled information depending on the control words. - View Dependent Claims (10, 11)
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12. A system for programming a programmable conditional access system, comprising:
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apparatus to provide descrambler means for converting scrambled information into descrambled information depending on control words; apparatus to provide security means for supplying the control words to the descrambler means so that the descrambler means perform the conversion; apparatus to provide means for supplying control word generation data, different from the control words, for recording on a storage media along with the scrambled information; and apparatus to provide generation means for providing the control words depending on the recorded control word generation data when the scrambled information along with the generation data is read from the storage media. - View Dependent Claims (13)
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14. A signal comprising:
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scrambled information for unscrambling by control words generated from control word generating data; and recording entitlement information for allowing or preventing recording of the control word generating data different from the control words, along with scrambled information.
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15. A conditional access system, comprising:
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de-scrambler means for converting scrambled information into de-scrambled information depending on key words; security means for providing the key words to the de-scrambler means depending on generation data that is independent of the scrambled information; and means for reading or recording the scrambled information and the generation data together on storage media. - View Dependent Claims (16)
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Specification