Abstract: The present invention aims at solving the financial revenue loss due to the presence of digital video recorders that allow skipping the commercial breaks.

Abstract: The aim of the present invention is to allow the flexible exploitation of a broadcasted and recorded content, in particular to allow both users as well as broadcasters to conciliate temporary prohibition and posterior exploitation. This aim is achieved by a storage method of a broadcasted event, by at least one receiver, this method comprising the following steps: storage of an event encrypted by at least one content key storage of a control licence comprising the content key, an event identifier and the first usage conditions, after the diffusion of the event has finished, generation and storage of a release message, comprising the event identifier and the second usage conditions, during the exploitation of the event, search for a release message, and if such message exists, execution of the second usage conditions of the release message in place of the first usage conditions of the control licence.

Abstract: Even if high speed are available between the router and the multimedia unit through the IP line (up to 24 Mbits/sec), this is still the bottleneck in term of data transfer. Indeed in practice the vast majority of IP users have access speed between 2 to 5 Mbits/sec and the development of other services (telephony, videoconference, push VOD, game) are bandwidth consuming. It is now an object of the invention to propose a solution to reduce the data flow between the router and the multimedia unit over IP line.

Abstract: The aim of this invention is to propose different distribution and management methods of the revocation lists associated to anti-copying protection standards, in order to facilitate processing in a television broadcast environment by guaranteeing security against the piracy of the receiver equipment and of the equipment connected to this television broadcast receiver at the core of a home network. This aim is achieved by a verification method of a target device connected to a master device, the latter having means to receive a content transmitted by a diffusion centre via a data stream, the master device and the target device authenticating themselves by the exchange of a certificate comprising at least one certificate identifier, this method comprising the following steps: a. transmission by broadcast of at least one target device verification table containing a certificate identifier list, b. storage of this list in the master device, c.

Abstract: The aim of this invention is to propose a control method for the conformity of a network key (NK). This method is applied during the transfer of data coming from a conditional access source to a domestic network. It handles on the verification of the network key (NK) authenticity using relevant control data provided by the verification center in general in form of a list {(TK)NK1, (TK)NK2, (TK)NK3 . . . }. A verification of the presence or absence of a cryptogram (TK)NK is carried out according to the list {(TK)NK1, (TK)NK2, (TK)NK3 . . . }. The cryptogram (TK)NK is constituted from a test key (TK), provided by the verification center, encrypted by a network key (NK) of a security module (CT) of a device (TV1, TV2, PC) connected to the network.

Abstract: The objective of the present invention is to propose a storage method in a decoder of an event encrypted by control words that guarantees the access to this event at whichever moment, even if certain keys of the system have changed for security reasons.