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US5590202A
Expired / Lapsed
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Countdown system for conditional access module
Assignee: LG Electronics Inc
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Filing: 1995-01-18
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Granted: 1996-12-31
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Expires: 2015-01-18
Abstract
Abstract A digital conditional access module for a subscriber terminal comprises a decryption device including at least one PID register and an associated countdown register. The decryption device is enabled for decrypting received product packets having a PID matching a PID stored in the PID register so long as the associated countdown register is characterized by a non-zero value. Decryption of a product packet results in the countdown register being decremented by a selected factor, the countdown register being prevented from assuming a zero value by setting its contents to a selected value in response to a received conditional access packet containing a PID matching the PID stored in the PID register. The selected value to which the countdown register is set may also be contained within the received conditional access packet.
Inventors
- 👤 Caitlin B. Bestler
- 👤 Harry A. Hartley, III
- 👤 Khosro M. Rabii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/08; H04L9/0891; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/235; H04N21/2351; H04N21/236; H04N21/23614; H04N21/25; H04N21/266; H04N21/26606; H04N21/26613; H04N21/40; H04N21/41; H04N21/418; H04N21/4181; H04N21/426; H04N21/42692; H04N21/43; H04N21/434; H04N21/4348; H04N21/435; H04N21/4353; H04N21/45; H04N21/462; H04N21/4623; H04N7/00; H04N7/16; H04N7/162; H04N7/163; H04N7/167; H04N7/1675; H04N21/234; H04N21/2347; H04N21/44; H04N21/4405; H04N21/47; H04N21/472; H04N21/47211; H04N21/60; H04N21/65; H04N21/658
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
101 words
A conditional access system for a subscriber terminal comprising: means operable for decrypting a received product packet identified by a PID; means including a PID register and an associated countdown register for enabling said decrypting means in response to the value of said received PID matching the value stored in said PID register and said associated countdown register having a value other than a first selected value; means for decrementing said countdown register each time one of said product packets is decrypted; and means for setting the countdown register to a second selected value in response to a received CA packet.
Claim 2
Dependent Claim
101 words
A conditional access system for a subscriber terminal comprising: means operable for decrypting a received product packet identified by a PID; means including a PID register and an associated countdown register for enabling said decrypting means in response to the value of said received PID matching the value stored in said PID register and said associated countdown register having a value other than a first selected value; means for decrementing said countdown register each time one of said product packets is decrypted; and means for setting the countdown register to a second selected value in response to a received CA packet.
Claim 3
Dependent Claim
17 words
The system of claim 1 wherein said second selected value is greater than said first selected value.
Claim 4
Dependent Claim
17 words
The system of claim 1 wherein said second selected value is contained in said received CA packet.
Claim 5
Dependent Claim
16 words
The system of claim 1 wherein said received CA packet comprises a globally addressed CA packet.
Claim 6
Dependent Claim
24 words
The system of claim 1 wherein said means for decrementing comprises means for decrementing said countdown register in response to a received CA packet.
Claim 7
Dependent Claim
34 words
The system of claim 1 wherein said means for setting comprises means for setting said countdown register in response to a CA packet containing a PID matching the PID stored in said PID register.
Claim 8
Dependent Claim
29 words
The system of claim 1 wherein said means for setting comprises means for setting said countdown register in response to a CA packet containing a selected subscriber authorization level.
Claim 9
Dependent Claim
21 words
The system of claim 1 wherein said means for enabling comprises plural ones of said PID registers and associated countdown registers.
Claim 10
Independent Claim
78 words
A method of controlling decryption of product packets contained within a multiplexed stream of product and conditional access packets comprising: decrypting selected ones of said product packets; decrementing a count each time one of said selected product packets is decrypted; inhibiting further decryption of said selected product packets if said count assumes a first selected value; and setting said count to a second selected value different from said first value in response to a received conditional access packet.
Claim 11
Independent Claim
78 words
A method of controlling decryption of product packets contained within a multiplexed stream of product and conditional access packets comprising: decrypting selected ones of said product packets; decrementing a count each time one of said selected product packets is decrypted; inhibiting further decryption of said selected product packets if said count assumes a first selected value; and setting said count to a second selected value different from said first value in response to a received conditional access packet.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein said second selected value is greater than said first selected value.
Claim 13
Dependent Claim
18 words
The method of claim 9 wherein said second selected value is identified in said received conditional access packet.
Claim 14
Dependent Claim
16 words
The method of claim 9 including decrementing said count in response to received conditional access packets.
Claim 15
Dependent Claim
27 words
The method of claim 9 including setting said count to said second selected value in response to a received conditional access packet identifying said selected product packets.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-31 | 2004-07-01 | 2004-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-31 | 2008-07-01 | 2008-12-31 | $7700.00 | Window Closed / Lapsed |