CA1264848C - Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals - Google Patents
Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signalsInfo
- Publication number
- CA1264848C CA1264848C CA 567574 CA567574A CA1264848C CA 1264848 C CA1264848 C CA 1264848C CA 567574 CA567574 CA 567574 CA 567574 A CA567574 A CA 567574A CA 1264848 C CA1264848 C CA 1264848C
- Authority
- CA
- Canada
- Prior art keywords
- signal
- key signal
- key
- unique
- algorithm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000567574A CA1264848A (en) | 1983-05-27 | 1988-05-24 | Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/498,800 US4613901A (en) | 1983-05-27 | 1983-05-27 | Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals |
CA000454444A CA1242793A (en) | 1983-05-27 | 1984-05-16 | Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals |
CA000567574A CA1264848A (en) | 1983-05-27 | 1988-05-24 | Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals |
US498,800 | 1990-03-26 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000453865A Division CA1236103A (en) | 1983-05-09 | 1984-05-08 | 1-SULFONYL-3-PYRIDINYL- OR PYRIMIDINYL-UREAS |
Publications (2)
Publication Number | Publication Date |
---|---|
CA1264848C true CA1264848C (en) | 1990-01-23 |
CA1264848A CA1264848A (en) | 1990-01-23 |
Family
ID=25670388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000567574A Expired - Lifetime CA1264848A (en) | 1983-05-27 | 1988-05-24 | Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA1264848A (xx) |
-
1988
- 1988-05-24 CA CA000567574A patent/CA1264848A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA1264848A (en) | 1990-01-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry | ||
MKEX | Expiry | ||
MKEX | Expiry |
Effective date: 20051004 Effective date: 20070123 |