ABSTRACT “MULTIMEDIA DATA PROTECTION” The invention provides a method of transmitting a media work such as a movie to a client comprising the steps of (a) encrypting the work using a sequence of different keys corresponding to respective temporally spaced segments of the document, (b) transmitting software code c...

A dynamic authentication system for digital TV, the system comprising a mobile telephone to be operated by an end-user in connection with a digital TV receiver, the mobile phone being adapted for the short message system SMS, a tamper resistant module, such as a user smart card in the digital TV receiver being ada...

NA

NOT SCANNED