CA1150820A - Videotex system provided with means for controlling access to the information - Google Patents

Videotex system provided with means for controlling access to the information

Info

Publication number
CA1150820A
CA1150820A CA000344659A CA344659A CA1150820A CA 1150820 A CA1150820 A CA 1150820A CA 000344659 A CA000344659 A CA 000344659A CA 344659 A CA344659 A CA 344659A CA 1150820 A CA1150820 A CA 1150820A
Authority
CA
Canada
Prior art keywords
octets
zero
generator
circuit
binary elements
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
Application number
CA000344659A
Other languages
English (en)
French (fr)
Inventor
Louis C. Guillou
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.)
Telediffusion de France ets Public de Diffusion
France Telecom R&D SA
Original Assignee
Telediffusion de France ets Public de Diffusion
Centre National dEtudes des Telecommunications CNET
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
Application filed by Telediffusion de France ets Public de Diffusion, Centre National dEtudes des Telecommunications CNET filed Critical Telediffusion de France ets Public de Diffusion
Application granted granted Critical
Publication of CA1150820A publication Critical patent/CA1150820A/en
Expired 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)
  • Television Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Lock And Its Accessories (AREA)
  • Small-Scale Networks (AREA)
CA000344659A 1979-02-06 1980-01-30 Videotex system provided with means for controlling access to the information Expired CA1150820A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FREN7902994 1979-02-06
FR7902994A FR2448824A1 (fr) 1979-02-06 1979-02-06 Systeme de videotex muni de moyens de controle d'acces a l'information

Publications (1)

Publication Number Publication Date
CA1150820A true CA1150820A (en) 1983-07-26

Family

ID=9221650

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000344659A Expired CA1150820A (en) 1979-02-06 1980-01-30 Videotex system provided with means for controlling access to the information

Country Status (9)

Country Link
US (1) US4337483A (US20080293856A1-20081127-C00127.png)
EP (1) EP0014652B1 (US20080293856A1-20081127-C00127.png)
JP (1) JPH0318396B2 (US20080293856A1-20081127-C00127.png)
CA (1) CA1150820A (US20080293856A1-20081127-C00127.png)
DE (1) DE3064785D1 (US20080293856A1-20081127-C00127.png)
ES (1) ES488280A0 (US20080293856A1-20081127-C00127.png)
FR (1) FR2448824A1 (US20080293856A1-20081127-C00127.png)
SU (1) SU1172456A3 (US20080293856A1-20081127-C00127.png)
WO (1) WO1980001636A1 (US20080293856A1-20081127-C00127.png)

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US4965825A (en) 1981-11-03 1990-10-23 The Personalized Mass Media Corporation Signal processing apparatus and methods
US7831204B1 (en) 1981-11-03 2010-11-09 Personalized Media Communications, Llc Signal processing apparatus and methods
USRE47642E1 (en) * 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods
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Also Published As

Publication number Publication date
EP0014652B1 (fr) 1983-09-14
SU1172456A3 (ru) 1985-08-07
FR2448824B1 (US20080293856A1-20081127-C00127.png) 1983-09-02
WO1980001636A1 (fr) 1980-08-07
JPS56500076A (US20080293856A1-20081127-C00127.png) 1981-01-22
DE3064785D1 (en) 1983-10-20
ES8106994A1 (es) 1980-08-01
US4337483A (en) 1982-06-29
FR2448824A1 (fr) 1980-09-05
JPH0318396B2 (US20080293856A1-20081127-C00127.png) 1991-03-12
EP0014652A1 (fr) 1980-08-20
ES488280A0 (es) 1980-08-01

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Effective date: 20000726