Patents by Inventor Jean-Luc Giachetti

Jean-Luc Giachetti has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5742681
    Abstract: Process for the broadcasting of programmes with progressive conditional access and separation of the information flow, as well as the corresponding receiver,In order to form the elementary flow, groups of m successive elements of the multiplex are taken and for forming the complimentary flow groups of p successive elements of the multiplex are taken.Application to television with entitlement checking.
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: April 21, 1998
    Assignees: France Telecom, Telediffusion de France
    Inventors: Jean-Luc Giachetti, Louis Guillou, Jean-Claude Pacaud
  • Patent number: 5442701
    Abstract: A process for broadcasting conditional access programs which permits a progressive access. Scrambled program data is transmitted along with partial access checking messages and complete access checking messages such that subscribers having a partial access right may descramble portions of the scrambled data corresponding to information regarding only the identity of the conditional access programs, and subscribers having a complete access right may descramble the remainder of the scrambled data and view the conditional access programs. The conditional access programs may be television pictures, radio programs, or data broadcasts.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: August 15, 1995
    Assignees: France Telecom Establissement Autonome de Droit Public, Telediffusion de France S.A.
    Inventors: Louis Guillou, Jean-Luc Giachetti, Alain Gelly
  • Patent number: 5349641
    Abstract: A process for the transmission and reception of scrambled conditional access programs, which are synchronously transmitted with entitlement control messages (ECM), with a reduced program switching time. The entitlement control messages (ECM) have check words, which are changed after a period of time called a phase, for descrambling the conditional access programs. The process includes transmitting main check messages (ECMp) for a main access program at a first frequency (Fp) and transmitting secondary check messages (ECMs) for secondary programs at a lower, second frequency (Fs). The secondary check messages (ECMs) are transmitted between two successive transmission of the main check messages (ECMp) such that all of the secondary check messages (ECMs) for each of the secondary programs are transmitted in a single phase. Therefore, a check word for any program is quickly acquired and program switching time is reduced.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: September 20, 1994
    Assignees: France Telecom Establissement Autonome de Droit Public, Telediffusion de France
    Inventors: Francoise Coutrot, Jean-Luc Giachetti
  • Patent number: 5218637
    Abstract: According to the invention, the chip card issues a first certificate comprising its letter of credentials (Crc), an exponential (X), an optional message (M), these quantities being signed. The security module verifies the signature and in return issues a second certificate containing its letter of credentials (Crm), an exponential (Y), an optional message (M'), a cryptogram (C), these quantities being signed. A common secret key is constituted between the card and the security module by the exponentials and allows the card to interpret the cryptogram addressed to it and to act in accordance therewith.
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: June 8, 1993
    Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace
    Inventors: Didier Angebaud, Jean-Luc Giachetti, Louis Guillou, Jean-Jacques Quisquater