CA1264848A - 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
CA1264848A
CA1264848A CA000567574A CA567574A CA1264848A CA 1264848 A CA1264848 A CA 1264848A CA 000567574 A CA000567574 A CA 000567574A CA 567574 A CA567574 A CA 567574A CA 1264848 A CA1264848 A CA 1264848A
Authority
CA
Canada
Prior art keywords
signal
descrambler
key signal
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
CA000567574A
Other languages
English (en)
Other versions
CA1264848C (fr
Inventor
Klein S. Gilhousen
Charles F. Newby, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cable Home Communication Corp
Engility LLC
Original Assignee
MA Com Government Systems Inc
Cable Home Communication Corp
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 by MA Com Government Systems Inc, Cable Home Communication Corp filed Critical MA Com Government Systems Inc
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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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
US498,800 1983-05-27
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

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 true CA1264848A (fr) 1990-01-23
CA1264848C 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
CA1264848C (fr) 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