CA1264848C - Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television - Google Patents

Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television

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)
Other versions
CA1264848A (fr
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 CA 567574 priority Critical patent/CA1264848C/fr
Application granted granted Critical
Publication of CA1264848A publication Critical patent/CA1264848A/fr
Publication of CA1264848C publication Critical patent/CA1264848C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
CA 567574 1983-05-27 1988-05-24 Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television Expired - Lifetime CA1264848C (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 567574 CA1264848C (fr) 1983-05-27 1988-05-24 Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television

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 (fr) 1983-05-27 1984-05-16 Systeme de chiffrage et de distribution de signaux-cles pour controler le brouillage et le debrouillage selectif a distance des signaux de television
CA 567574 CA1264848C (fr) 1983-05-27 1988-05-24 Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television
US498,800 1990-03-26

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA000453865A Division CA1236103A (fr) 1983-05-09 1984-05-08 1-sulfonyl-3-pyridinyl- ou pyrimidinyl-urees

Publications (2)

Publication Number Publication Date
CA1264848A CA1264848A (fr) 1990-01-23
CA1264848C true CA1264848C (fr) 1990-01-23

Family

ID=25670388

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 567574 Expired - Lifetime CA1264848C (fr) 1983-05-27 1988-05-24 Systeme de cryptage et de distribution a signaux cles pour controler le brouillage et le debrouillage selectif a distance de signaux de television

Country Status (1)

Country Link
CA (1) CA1264848C (fr)

Also Published As

Publication number Publication date
CA1264848A (fr) 1990-01-23

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