FR2583946B1 - ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY - Google Patents

ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY

Info

Publication number: FR2583946B1
Authority: FR; France
Prior art keywords: access control; electronic key; television system; control television; variable electronic
Prior art date: 1985-06-24
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

FR8509679A

Other languages

French (fr)

Other versions

FR2583946A1 (en

Inventor

Jean

Francois Gautier Christian

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.)

France Telecom R&D SA

Gouvernement de la Republique Francaise

Original Assignee

France Telecom R&D SA

Gouvernement de la Republique Francaise

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.)

1985-06-24

Filing date

1985-06-24

Publication date

1988-07-29

1985-06-24 Application filed by France Telecom R&D SA, Gouvernement de la Republique Francaise filed Critical France Telecom R&D SA

1985-06-24 Priority to FR8509679A priority Critical patent/FR2583946B1/en

1986-12-26 Publication of FR2583946A1 publication Critical patent/FR2583946A1/en

1988-07-29 Application granted granted Critical

1988-07-29 Publication of FR2583946B1 publication Critical patent/FR2583946B1/en

Status Expired legal-status Critical Current

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)

FR8509679A 1985-06-24 1985-06-24 ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY Expired FR2583946B1 (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
FR8509679A FR2583946B1 (en)	1985-06-24	1985-06-24	ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR8509679A FR2583946B1 (en)	1985-06-24	1985-06-24	ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY

Publications (2)

Publication Number	Publication Date
FR2583946A1 FR2583946A1 (en)	1986-12-26
FR2583946B1 true FR2583946B1 (en)	1988-07-29

Family

ID=9320666

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR8509679A Expired FR2583946B1 (en)	1985-06-24	1985-06-24	ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY

Country Status (1)

Country	Link
FR (1)	FR2583946B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2631193B1 (en) *	1988-05-06	1994-09-16	Europ Rech Electr Lab	METHOD FOR SCRAMBLING AND SCALING-UP OF COMPOSITE VIDEO SIGNALS, AND IMPLEMENTING DEVICE
FR2638045A1 (en) *	1989-10-31	1990-04-20	Belloli Pascal	Video and/or audio encoder/decoder
FR2750554B1 (en) *	1996-06-28	1998-08-14	Thomson Multimedia Sa	CONDITIONAL ACCESS SYSTEM AND CHIP CARD ALLOWING SUCH ACCESS
FR2751817B1 (en) *	1996-07-29	1998-09-11	Thomson Multimedia Sa	CONDITIONAL ACCESS SYSTEM USING MULTIPLE ENCRYPTION KEY MESSAGES

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4024574A (en) *	1975-02-26	1977-05-17	Teleglobe Pay Tv System Inc.	Validation method and apparatus for pay television systems
US4112464A (en) *	1977-05-11	1978-09-05	Oak Industries Inc.	Subscription TV decoder logic system
FR2459595A1 (en) *	1979-06-15	1981-01-09	Telediffusion Fse	ACCESS CONTROL TELEVISION SYSTEM USING A VARIABLE ELECTRONIC KEY

1985
- 1985-06-24 FR FR8509679A patent/FR2583946B1/en not_active Expired

Also Published As

Publication number	Publication date
FR2583946A1 (en)	1986-12-26

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Legal Events

Date	Code	Title
1991-12-13	TP	Transmission of property
2001-07-06	CL	Concession to grant licenses
2002-08-09	CL	Concession to grant licenses