Thomson Multimedia S.a.

Jean-Marie Vigneron

Louis Gregoire

Arnaldo Campinos

The invention relates to a process for data certification as well as to the system implementing the certification process. The certification of the data is performed by scrambling. An authority independent of the entity which controls the data source and of the user(s) for which these data are intended, scrambles the data with the aid of control words and encrypts the control words with the aid of an encryption algorithm with key K. So that a user or the users can descramble the data scrambled by the independent authority, a certification verification device containing the encryption key K is supplied to the user or users under the control of the independent authority. The certification process and the system associated therewith apply more particularly to conditional-access systems.

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Fontainebleau, France

Jean-Marie Vigneron