Abstract: 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 containing an algorithm from a security server to the client, the algorithm having a result that is a function of the state of the client, (c) executing the code at the client and returning the result to the security server, (d) determining whether the result is indicative of an unmodified client, and further comprising the steps of: (e) transmitting a segment from a server to the client, (f) securely streaming a key corresponding to the transmitted segment from a secure remote server to the client, (g) decrypting the segment using the obtained media key, (h) if step (d) indicates a modified client, preventing further keys from being transmitted, otherwise repeating steps (e) to (g) and repeating steps (b) to (d).

Abstract: 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 systems SMS, a tamper resistant module, such as a user smart card in the digital TV receiver being adapted to generate a dynamic authentication code to be shown on the television screen (TV), the end-user reads and enters said authentication code into his mobile phone, said authentication code and application specific data thereafter being sent via SMS to an application server containing or making use of an authentication code validation system, and depending on whether among others the authentication code is acceptable, grants or conducts a certain service for the end-user.

Abstract: A method and a secure offline betting device for playing games offered by a betting operator offline and away from the premises of the betting operator, the device thereby comprising a purse application (1), an 1/O controller (2), a games application (3, 13), a cryptologic application (4), a physical 1/O device (9), a random generator application (11) and a logging application (12) all encapsulated in a tamperproof physical enclosure (5).