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 signals

Info

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
Application number
CA 567574
Other languages
English (en)
French (fr)
Other versions
CA1264848A (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/498,800 external-priority patent/US4613901A/en
Application filed filed Critical
Priority to CA000567574A priority Critical patent/CA1264848A/en
Application granted granted Critical
Publication of CA1264848C publication Critical patent/CA1264848C/xx
Publication of CA1264848A publication Critical patent/CA1264848A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
CA000567574A 1983-05-27 1988-05-24 Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals Expired - Lifetime CA1264848A (en)

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)

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