CA1157144A - System for transmitting information between an emitting centre and receiving stations - Google Patents

System for transmitting information between an emitting centre and receiving stations

Info

Publication number
CA1157144A
CA1157144A CA000344684A CA344684A CA1157144A CA 1157144 A CA1157144 A CA 1157144A CA 000344684 A CA000344684 A CA 000344684A CA 344684 A CA344684 A CA 344684A CA 1157144 A CA1157144 A CA 1157144A
Authority
CA
Canada
Prior art keywords
subscriber
keys
key
receiving
operating key
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
CA000344684A
Other languages
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 CA1157144A publication Critical patent/CA1157144A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26613—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing keys in general
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]

Abstract

ABSTRACT OF THE DISCLOSURE
A system for transmitting information between an emitting center and receiving stations, comprising:
a subscription administration center generating a plu-rality of subscriber's keys Ci changing randomly at relatively long intervals of the order of a month; in the emitting center: a generator of an operating key K
changing randomly at relatively short intervals of the order of a few minutes; a circuit for forming messages Mi obtained from said subscriber's keys Ci and from the operating key K by means of an algorithm, all the mes-mages Mi then being directed towards the emitting center; and automatic encryption means using the ope-rating key K, in each receiving station: a subscription holder on which is recorded a signal corresponding to at least one of the subscriber's keys Ci; a circuit for restoring the operating key receiving the messages Mi and the subscriber's key Ci, this circuit working out an algorithm for restoring the signal corresponding to the operating key K used in the emitting center; an au-tomatic decryption means; and at least one charging station capable of temporarily receiving the subscrip-tion holders and permanently recording one of the sub-scribers's key Ci thereon.

Description

~57~44 BACKGROUND OF THE INVENTION
This invention relates to a system for transmitting information between an emitting centre and receiving stations, this system being provided with means for controlling access to the information trans-mitted.
The invention can be used in the transmission and display of information on television receivers for purposes of entertainment, information or education.
It can advantageously be applied to the system known under the trademark ANTIOPE (Numerical Acquisition and Televisualisation of Images Organised into Pages of Script), the so-called TITAN (trademark) system (Inter-active Teletext Terminal Called by Numbering), the so-called EPEOS (trademark) system (Recording ofBroadcasts Programmed by the Order of Sources).
It is known that - the first is essentially a system of broad-cast videotex by means of which alphanumerical information organised into pages and magazines can be put into television lines, - the second is essentially an interactive videotex system which is compatible with the ANTIOPE
system and affords access to data bases (general information, directories, etc.) and to interactive services (transactions, messages, education) '~

~L57~4 through the telephone system, - the third is essentially a programme carrying system which permit!Q, via a data distribution line, the telecontrol, from an emitter source, of the action of recording a pre-selected tele~ision programme by means of receiving equip-ment (such as a video tape recorder, for example).
For the distribution of information. these three system~
use a pnK~re known under the tradem~rk D~XN (Distribution of Nu~i~
Data) which is a method of distribution in bundles, compatible with the distribution of the television signal.
The advent of services of the A~IOPE, TITAN and EPEOS
type raises the question of their taxation, i.e. the imple-mentation of a system by means of which the audiences can be identified and monitored. This question arises more gener-1g ally with any broadcast service tending to make the broad-casting system~ more ~iable by better use of the resources.
Taxation of the subscription type constitutes a both flexible and durable relationship between a service and its users. Such a method of taxation is particularly ~ustified in broadcasting.
Taxation of the type based on consumption may al80 be used; this method of taxation 1s fundamental for Ninteractive"
systems (where there is a dialogue between the subscriber and the information source, as in the case of the TITAN system);
however, it is of secondary importance in broadcastlng systems (in which information is transmitted in one direction to the subsoribers, as with ANTIOPE).

~";

~3L57144 There may be intermediate systems known as "quasi-interactive" systems wherein the content of the distribution source is continuously modified to meet the requirements of the users, which ~re transmitted via a public data network. The advent of new distribution means with a very large capacity, such as satellites, will develop this quasi-interactive method considerably, thus making it necessary to implement a system for controlling access to the information pro~ided.
This problem of access control raises above all the problems of locking up the information when it is broadcast and unlocking it when it is received, and naturally these problems must be resolved in accordance with the specificity of the system which is to be controlled.
BRIEF SUMMARY OF THE INVENTION
The present invention relates precisely to a general means of controlling access to the information, and whlch can be applied to a large number of information transmitting systems, particularly the three mentioned hereinbefore.
According to the invention, a double Xey system is essentially used:
- an operating key K which enables the information to be loc~ed up; this key changes in random manner at relatively short intervals of the order of a few minutes;
a subscriber's key capable of assuming se~eral values Ci depending on the type of subscription; this key also changes ~n random fashion but at long intervals, of the order of a ~onth. This subscriber's key is recorded on a subscription ~7~44 holder inserted in each receiver set. Special messages arecomposed for broadcasting and are transmitted with the data.
These messages enable the operating key to be set up in the receiver set and thus open the electronic lock which secures the information transmitted.
More precisely, the invention relates to a system for transmitting information between an emitting centre and receiving stations, the emitting centre comprising acircuit forming signal8 carrying said information and a means for emitting said signals, each receiving station comprising a means for receiving the signals trans~itted and a means for displaying the infor~ation, c`naracterised in that it further co~prises:
A) a subscription directing centre generating a plur-ality of signals constituting subscriber's keys Ci, these subscriber's keys changing randomly at relatively long inter-~als of the order of one month;
B) in the emitting centre:
a) a generator of a signal constituting an operating key K, this keyc~2nging randomly at relatively short intervals of the order of a few minutes, b) a circuit for forming messages Mi obtained from the subscriber's keys Ci and the operating key K by an al~orithm the parameters of which are provided by the subscriber's keys, i.e. Mi = FC (k), this circuit supplying as many messages as there are subscriber's keys, these messages changing with the operating key, after which all the messages Mi are directed ~i ~S7~44 towards the emitter means.
c) an automaticen~ptionmeans using the operating ~ey~, said automatic means receiving signals carrying the infor-mation and deliveringenc~dsignals which are then d~rected towards the emitter means, C) in each receiving station:
a) a subscription holder on which is recorded a signal corresponding to at least one of the subscriber's keys Ci, b) a circuit for reconstituting the operating key receiving on the one hand the messagesMi received and, on the other hand, the subscriber's key Ci, this circuit producing an algorithm K = GC (Mi) by means of which it is possible to reconstitute the signal corresponding to the operating key used in the emitting station from the messages Mi received and from the subscriber's key Ci, c) automatic dec~ion means connected, on the one hand, to the receiving means from which it recei~es the enc~ d signals and, on the other hand, to the reconstituting circuit ( from whlch it receives the operating key K, said automatic means decrypting theenc~ ds~gnals, by using the operating key, and delivering the decrypted signals wh~ch are then directed towards the informat~on display means, D) at least one station for charging the subscription holders, this ~tation being connected to the subscription directing centre from which it receives the signals correspond_ ing to the different subscriber's keys Ci generated by this centre, each station being capable of temporarily rece~ving ~. ., ~

~L~L5~144 the subscription holders and permanently recording one of the subscriber's keys Ci thereon.
BRI~F D~SCRIPTION OF THE DRAWINGS
In any case, the features and advantages of the invention will become more apparent from the following description of some exemplary embodiments given by way of explanation, with-out being in any way restrictive. This de~cription refers to the accompanying drawings, wherein:
Fig. 1 is a synoptic plan of the system according to the invention;
Fig. 2 is a diagram illustrating the fluxes of inform-ation in the system shown in the previous figure;
Fig. 3 shows an example of the application of the invention to an ANTIOPE-type videotex system.
DETAIL~D ~ESCRIPTION OF ~I~E PREFERRED ~1BODI~;r.~7TS
The system shown in Fig. 1 comprises firstly a sub-scription directing centre 100 which generates a plurality of signals constituting subscriber's keys Ci, these subscriber's keys changing randomly at relatively long inter~als of the order of a month.
The transmitting system is organised around an emitting centre 2 which comprises:
a) a circuit 6 for forming signals d carrying inform-ation, b) a generator 22 of a signal constituting an operating ~ey K, this key changing randomly at relatively short inter-va~s of the order of a few minutes, ~3~57144 c) automaticenc~ionmeans 24 using the operating key K; these means recei~e the si~nals d carrying the ~nformation and deliveren~tedsignals D, d) a circuit 102 for forming messages M~ obtained from the subscriber's keys Ci and from the operating key K by-means of an algorithm the parameters of which are provided by the subscriber's keys, i.e. Mi Z FC (K), this circuit delivering as many messages as there are subscriber's keys; these messages change with the operating key; they are directed towards the emitter means 12.
e) a means 12 for emitting the ~nformation signals and messages.
At the other end, the system comprises receivers, each of which comprises:
a) a means 14 for recei~ing the signals transmitted;
b) a holder 106 which comprises a subscription memory 108 in which is recorded a signal corresponding to at least one of the subscriber's keys Ci, c) a circuit 110 for reconstituting the operating key;
this circuit receives, on the one hand, the messagesMi and, on the other hand, the subscr~ber's key Ci; this circu~t ~s capable of producing an algorithm K = GC (Mi) for reconstl-tuting the signal corresponding to the operating ~ey K used in the emitting station, from the messages Mi received and from the subscriber's key Ci, d) automatic decryption means 38 which are connected, on the one hand, to the receiving means 14 from which they receive 1~57~44 thee~3~ptedsignals D and, on the other hand, to the reconsti-tuting circuit 110 from which they receive the operating key K; these automatic means use the operating key and de~k the enc~ dsignals D; they deliver the-d~pted signals d which are then directed to e) display means 20 consisting of a display tube, for example.
The system shown also comprises at least one charging station 112 for the subscription holders, this station being connected to the subscription directing centre 100 from which it receives the signals corresponding to the different sub-scriber's keys C~ generated by this centre; each station 112 is capable of temporarily receiving subscription holders and permanently recording one of the subscriber's keys C~ in their memories 108.
To illustrate the operation of this double key system, one can take the example of a subscription plan using four types of subscription: ~ month, ~ months, 6 months and a year.
In addition to its duration, a subscription is characterised by the month ~n which it starts. With a plan of this kind, in a given month and for a given service, there are thus 22 subscriber's ~eys which may be used by the users: a monthly key, three three-month~y keys, six six-monthly keys and twel~e yearly keys.
Each month, the taxation administration centre 100 pro~ides each emitting centre 2 with a list of 22 subscriber's keys Ci in use for each service distributed by this centre.

~ t s7~4 In addition, it supplies the charging stations 112 with another list of 4 keys to start in the following month (one month, three months, six months and one year), for each service, with the prices of the subscriptions.
A suitable machine installed in each sales point records some of these keys in the form of blocks of subscriptions in the memories 108 of the holders. These holders may, for example, be information-bearing cards of the credit card type.
These cards are then inserted into the receiving station 4 by the users of the service.
For each paying service, approximately every five minutes a new operating key K is generated at random by each distri-bution centre in question. Thus, in the course of a sessi~n of a service (one hour or several hours), there may be several dozen operating keys following one after another.
As soon as a distribution centre generates a new opera-ting key K, it calculates, for each subscriber's key Ci being used for this service, a message Mi, by means of an algorithm Mi = FC (~)~ with the keys Ci acting as parameters.
Thus, for a service having the subscription plan indic-ated above, at any one time there are 22 different messages in ~orce. The duration of a message is equal to that of the operating key K and for a given service, at any one time, there are as many messages as there are current subscriber's keys.
All the messages Mi in force together constitute the access-controlling information associated with the service being broadcast.
_g_ 3L~57~4 Figure 2 shows a diagram of the fluxes of information in the system according to Fig. 1. The parts shown in the first figure have the same reference numerals in the second, i.e. the source 6 of clear signals d, the automatic enc~ption means 24 which deliver theenc~d6ignals D! the emitting and receiving means 12 and 14; the decr~ion circuit 38 which delivers the d=~rd signals d, the display means 20, the sub-scription administration centre l00 and finally the access controller 110 or subscription card.
In zone A, upstream of theenC~ionmeans~ the information is in clear; in zone B, it is locked up.
It is in clear again downstream of the automatic de-cryptionmeans 38. The information emanating from the administration centre 100 consists of subscriber's keys Ci. The access controller 110, in turn, recei~es the keys Ci and the messages Mi. From them it takes the operating key K required for the d~yption operation.
The invention can advantageously be used in controlling access to the information distributed by an ANTIOPE system. This particular application is des-cribed by Fig. 3. This Figure is edentical to Fig. 7 in Canadian patent application no. 344,659 filed on January 30, 1980 and entitled: "Videotex system provided with means for controlling access to information". This particular application will therefore be described only briefly here.

~L~L571~4 -lOa-The circuit in Fig. 3 comprises means already shown in Fig. 1 and for the sake of simplicity these means have the same refer-ence numerals. The circuit also comprises:

~5731 ~4 A) in the emitting centre:
- a circuit 10 for memorising an ANTIOPE magazine com-posed by the circuit 6, this magazine comprising pages organ-ised in rows and two junctions 11 and 11' bet~een which is inserted an automaticenG~ionmeans 24. The automaticen~q~ion means comprises:
(i) a comparator 28 with an input connected to the magaz-ine memorising circuit 10 from which it receives clear e~ght-bit bytes; among these clear eight-bit bytes, this comparator is able to distinguish those wherein the 7th and 6th binary elements are zero, which are the controlling eight-bit bytes;
this comparator comprises two outputs 31 ~nd 32, the fir~. of which carries the eigh~-bit bytes ha~ing zero 7th and 6th binary elements and which is cor.nected to the distribution multiplexer 1~ (through ilmction 11'), and the second of which carries the clear eight-bit bytes d whose 7th and/or 6th binary elements are not zero;
(ii) a logic circuit 34 of the OR-exclusive type with two inputs, sne of which is connected to the second output 32 of the comparator 28 from which it receives the clear eight-bit bytes having 6th and 7th binary elements which are not zero; this logic circuit has an output which carries the odd-numbered encoded bytes D which are then directed (through ~unction 11') towards the distribution multiplexer 12.
The emitting centre also comprises a generator 26 of encoding eight-bit bytes controlled by the automatic means 24 from which it receives eight-bit bytes indicating the page ,,~,,, ~ 57 ~4 numbers andline numbers of the data to be transmitted and the signal corresponding to the operating key K; this eight-bit byte generator 26 delivers, for each eight-bit data byte of a displayable line, an encoding eight-bit byte C~, the latt-er ha~ing an .e~en-humbered-~th binary element and 7th and 6th binary elements of zero, this eight-bit byte being applied to the second input of the OR-exclusive circuit 34.
B) in each receiving station:
- a line 16 for processing video picture signals, ln parallel with the automatic deQ~*ion means ~8. The latter means comprises:
i) a comparator 42 with an input receiving ~encoded eight-bit bytes; this comparator is capable of distinguishing, among these numbered bytes, those wherein the 7th and 6th binary elements are zero; this comparator has two outputs 43 and 44, the first of which carries these bytes wherein the 7th and 6th binary elements are zero, this first output be~ng connected to the display means 20, whilst the second output carries the encoded eight-bit bytes D~ wherein the 7th and 6th binary elements are not zero.
li) a logic circuit 46 of the OR-exclusi~e type with two inputs, one connected to the output 44 of the comparator from which it receives the encoded eight-bit bytes D, this logic circuit having an output which carries the decoded eight-bit bytes d which are then directed towards the display means 20.
iii) a generator of decoding eight-bit bytes~ controlled . -~, ~:~57144 by the automatic d~yption means from which it receives theeight-bit bytes indicating the page numbers and line numbers of the data transmitted, and the signal corresponding to the current operating key K; this generator o~ decoding eight-bit bytes has an output 41 which deliYers, for each coded byte received, a decoding eight-bit byte having a heavy binary element which is forced to zero and 7th and 6th binary elem-ents equal to zero, these eight-bit bytes being applied to the second input of the gate 46.
The formstion of messa~es Mi from the subscriber's keys Ci and from the operating key K may advantageously be effec~ed as follows:
The circuit 102 of the emittin~ centre is organised around a microprocessor programmed to impleDent an algorithm which is based on two Galois bodies having the ~5ersenne primary numbers 261-1 and 2127-1 as their characteristics. Thls algorithm uses subscriber's keys C1 of 128 binary elements and an operating key K of 56 binary elements, in the followlng manner:
1) a confusion redundancy word 7~ is formed, comprising 61 binary elements generated at random each time the algo-rithm is implemented;
2)7r 1, the inverse of ~ modulo 261-1, is calculated by an arithmetical programme using a ~aria~t of Euclid's algorithm;
3) a first multiplication by another arithmetical pro-gramme: ~ = K.~ 1, modulo (261-1), is carried out;

~,",- .

~L57~44
4) r , the inverse of C modulo 2 27-1, is calcul~ted by a programme similar to that in (2);
5) finally, the message is calculated by a program~e similar to (~) : M = r.(~ t 264. ~) modulo (2127-1).
~n1en the messages have been thus for...ed, the algorith~
to be worked ou~ in tne circuit 110 for reconstitutingopera-ting key K from a message Mi and a subscriberls key Ci is as follows:
1. The message Mi (127 useful binary elements) is taken octet by octet and ~ultiplication by Ci is carried out on the first body CG (2127~ hus, a word ~ is ior~led ~ = M. C ~odulo (2127-1) According to the construction of M on emission, the binary elements 1 to 61 of ~ represent the ~ord ~ , whi.lst binary elements 65 to 125 represent the word /l . Obviously, binary elements 62, 63, 64, 126 and 127 should be zero. If they are not, the word ~ is brought to zero before continuing the calculation.
2. ~ and ~ are multiplied on the second body CG(261-1), thus eliminating the redundancy of confusion, and K - ~.7r modu~o (Z61-1) is obtained.
3, The 56 useful binary elcr~ents of K are then put into the form of eight odd eight-bit bytes.
As regards the means for producing a holder ~6 containing a subscriution memory 108 and a circuit 1~0 adapted to restore the operating key, these, and the charging station 112, are the object of another Canadian patent application no.
-14- .
";

~ 57~4 344,660 filed on Janaury 30, 1980 and entitled:
"Subscription card for a videotex receiver and charging station for said card".
The invention is not limited to the embodi-ments described and represented hereinbefore and various modifications can be made thereto without passing beyond the scope of the invention.

B

Claims (9)

The embodiments of the invention in which an exclu-sive property or privilege is claimed are defined as follows:
1. A system for transmitting information between an emitting centre and receiving stations, the emitting centre comprising a circuit for forming signals carrying said information and means for emitting said signals, each receiving station comprising means for receiving the signals transmitted and means for displaying the information, wherein it also comprises:
A) a subscription administration centre generating a plurality of signals constituting subscriber's key Ci, these subscriber's keys changing randomly at relatively long intervals of the order of a month;
B) in the emitting centre:
a) a generator of a signal constituting an operating key K, this key changing randomly at relatively short intervals of the order of a few minutes, b) a circuit for forming message Mi obtained from said subscriber's keys Ci and from the operating key K by means of an algorithm the parameters of which are provided by the subscriber's keys, namely Mi = FCi (K), this circuit delivering as many messages as there are subscriber's keys, these messages changing with the operating key, all the messages Mi then being directed towards the emitter means, c) an automatic encryption means using the operating key K, this automatic means receiving signals carrying the information and delivering encrypted signals which are then directed towards the emitter means, C) in each receiving station:
a) a subscription holder on which is recorded a signal corresponding to at least one of the subscriber's keys Ci, b) a circuit for restoring the operating key, receiving on the one hand the messages Mi received and, on the other hand, the subscriber's key Ci, this circuit working out an algorithm K = GCi (Mi) for restoring the signal corresponding to the operating key K used in the emitting station from the messages Mi received and from the subscriber's key Ci, c) an automatic decryption means which is connected, on the one hand, to the receiving means from which it receives the encrypted signals and, on the other hand, to the restoring circuit from which it receives the operating key K, this automatic means decrypting the encrypted signals, by using the locking key, and delivering decrypted signals which are then directed towards the information display means, D) at least one charging station for the subscrip-tion holders, this station being connected to the subscrip-tion administration centre from which it receives the signals corresponding to the different subscriber's keys C
generated by this centre, each station being capable of temporarily receiving the subscription holders and permanently recording one of the subscriber's keys C
thereon.
2, An information transmitting system according to claim 1, wherein the signals corresponding to the subscriber's keys Ci, to the operating key K and the messages Mi are all of the binary numerical type.
3. An information transmitting system according to claim 1, wherein the transmitting means use a television channel.
4. An information transmitting system according to claim 3, wherein the transmitting means use the DIDON procedure.
5. An information transmitting system according to claim 1, wherein it is a videotex system.
6. An information transmitting system according to claim 5, wherein it conforms to the ANTIOPE system.
7. An information transmitting system according to claim 6, wherein it comprises means for organising all the messages Mi into a special page and for cyclically transmitting this page in clear to receiving stations, this page not being displayable.
8. An information transmitting system according to claim 5, wherein it conforms to the TITAN system.
9. An information transmitting system according to claim 1, wherein it conforms to the EPEOS system.
CA000344684A 1979-02-06 1980-01-30 System for transmitting information between an emitting centre and receiving stations Expired CA1157144A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7902995A FR2448825A1 (en) 1979-02-06 1979-02-06 SYSTEM FOR TRANSMITTING INFORMATION BETWEEN A TRANSMISSION CENTER AND RECEIVING STATIONS, WHICH IS PROVIDED WITH A MEANS OF CONTROLLING ACCESS TO THE INFORMATION TRANSMITTED
FREN7902995 1979-02-06

Publications (1)

Publication Number Publication Date
CA1157144A true CA1157144A (en) 1983-11-15

Family

ID=9221651

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000344684A Expired CA1157144A (en) 1979-02-06 1980-01-30 System for transmitting information between an emitting centre and receiving stations

Country Status (9)

Country Link
US (1) US4323921A (en)
EP (1) EP0014653B1 (en)
JP (1) JPH027234B2 (en)
CA (1) CA1157144A (en)
DE (1) DE3069329D1 (en)
ES (1) ES8106993A1 (en)
FR (1) FR2448825A1 (en)
SU (1) SU963479A3 (en)
WO (1) WO1980001635A1 (en)

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