Process for the transmission and reception of personalized programs
First Claim
1. Process for the transmission and reception of programs with access control to said programs, wherein:
- (A) on transmission;
the programs are scrambled by a control word and access control messages are formed which in particular contain access criteria and a cryptogram of the control word,(B) on reception;
a check is made to establish whether the access criteria are fulfilled, the control word used for scrambling is reconstituted and the received programs are descrambled,said process being characterized in that, for addressing personalized programs to different recipients identified by identifiers,(A) on transmission;
the control word used for scrambling the program intended for the particular recipient is obtained by personalization, with the aid of the identifier of said recipient, of a single control word called the root control word and which applies to all the recipients and only a single access control message is transmitted for all the recipients, said message more particularly containing a cryptogram of the root control word,(B) on reception;
each recipient, with the aid of the recipient'"'"'s identifier and the access control message, reconstitutes, on the basis of the root control word, the recipient'"'"'s own personalized control word, which enables only the intended recipient to descramble the program.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for the transmission and reception of personalized programs. The program is constituted by personalized program elements containing an identification of the recipient or addressee, the access to each program element being reserved for a single recipient and is conditioned for the possession of an access title covering the access criteria to the service and the possession of an individual identification on the part of each recipient. The access title control message enables users of the service to calculate, on the basis of the single cryptogram of a root control word and the identification of the recipient, all the personalized control words which will enable each recipient and him alone to descramble the elements relating to him.
146 Citations
12 Claims
-
1. Process for the transmission and reception of programs with access control to said programs, wherein:
-
(A) on transmission; the programs are scrambled by a control word and access control messages are formed which in particular contain access criteria and a cryptogram of the control word, (B) on reception; a check is made to establish whether the access criteria are fulfilled, the control word used for scrambling is reconstituted and the received programs are descrambled, said process being characterized in that, for addressing personalized programs to different recipients identified by identifiers, (A) on transmission; the control word used for scrambling the program intended for the particular recipient is obtained by personalization, with the aid of the identifier of said recipient, of a single control word called the root control word and which applies to all the recipients and only a single access control message is transmitted for all the recipients, said message more particularly containing a cryptogram of the root control word, (B) on reception; each recipient, with the aid of the recipient'"'"'s identifier and the access control message, reconstitutes, on the basis of the root control word, the recipient'"'"'s own personalized control word, which enables only the intended recipient to descramble the program. - View Dependent Claims (2, 3, 4)
-
-
5. Process for the transmission of programs wherein the programs are scrambled by a control word and access control messages are formed which contain access criteria and a cryptogram of the control word,
said process being characterized in that, for addressing personalized programs to different recipients identified by identifiers, the control word used for scrambling the program intended for a particular recipient is obtained by personalization, with the aid of the identifier of said recipient, of a single control word called the root control word and which applies to all the recipients and only a single access control message is transmitted for all the recipients, said message more particularly containing a cryptogram of the root control word.
Specification