Abstract: A thin high strength steel sheet having excellent formability has a composition which includes, by mass %, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.01 to 0.1% of Al, and 0.005% or less of N.

Abstract: In one embodiment of the present invention, a method is disclosed for conditional access to a digital data stream encrypted with at least one first control word and broadcasted via an emitter of a broadcasting network to at least one mobile equipment, the latter also being connected via a mobile communication network to a management center, the stream containing control messages encrypted with a transmission key and including a second control word obtained by the encryption of the first control word with a local key, the method includes the following steps: reception by the mobile equipment of at least one cryptogram via the mobile network, determination of at least one local key from the received cryptogram, reception of a control message via the broadcasting network, decryption of the message and obtaining the second control word, decryption of the second control word with the local key and obtaining the first control word, and decryption of the data of the stream with the first control word.

Abstract: A method for distributing a digital image content, including a modification stage of an original digital image content by modifying at least a part of digital image data, the modification producing a modified digital image content of the same nominal format as the original digital image content, transmitting the modified digital image content, and a reconstruction stage implemented within a decoder for obtaining a reconstituted digital image content, wherein the reconstruction is adaptive and progressive as a function of information coming from a digital profile of the recipient.

Abstract: A process for distributing a marked audiovisual sequence from a nominal audiovisual sequence towards a receiver, said nominal audiovisual sequence having a nominal content, comprising: generating a marked audiovisual sequence according to a first mark applied to initial content at marking positions; generating a modified stream having a modified content different from the nominal content at least at marking positions; generating a complementary stream so that it is possible to reconstitute the marked audiovisual sequence from the modified stream; and transmitting the modified stream and the complementary stream towards the receiver wherein, on the receiver, a reconstitution of the audiovisual sequence, comprises calculating new complementary data according to the marking positions and the complementary stream so that it is possible to create an audiovisual sequence marked with a second mark from the modified stream, wherein the second mark, being different from the first mark, is applied to the initial conten

Abstract: A method for distributing a digital image content, including a modification stage of an original digital image content by modifying at least a part of digital image data, the modification producing a modified digital image content of the same nominal format as the original digital image content, transmitting the modified digital image content, and a reconstruction stage implemented within a decoder for obtaining a reconstituted digital image content, wherein the reconstruction is adaptive and progressive as a function of information coming from a digital profile of the recipient.

Abstract: A method embeds tracing secret data into multimedia contents delivered to particular users. The method descrambles a first scrambled video stream having alternate values to obtain a personalized video stream corresponding to an original video stream by a decoder comprising at least a security unit and a descrambling unit, the personalized video stream being obtained by restoring the alternate values by personalized values taking into account an internal parameter on the security unit and received control data containing the original values and their location in the modified stream.

Abstract: A method for processing a set of control messages used to access an encrypted stream by a multimedia unit. These messages include a discrimination parameter having a different value for at least three consecutive non-redundant messages in the stream. The method includes the steps of receiving a current control message; reading the discrimination parameter from the current control message; retrieving from a memory the discrimination parameter from the message processed previously; comparing the current and previous discrimination parameters; and blocking said current control message if the comparison step indicates that the discrimination parameters are identical. The method is characterized in that the discrimination parameter is unique and different for each message in the set of control messages, such that, during the filtering step, the current message and the previously processed message can be non-consecutive in the ordered subset of messages.

Abstract: Methods and systems are disclosed for distributing video sequences in a coded stream. The methods and systems include analyzing an original coded stream, generating at least one modified coded sub-frame, generating, based upon the analysis, a modified stream and a second stream by replacing an original coded sub-frame by the modified coded sub-frame, so that the modification from the original coded sub-frame results in a visually altered video sequence, transmitting the first and the second generated streams, and reconstructing the original stream using the modified coded sub-frame contained in the second stream.

Abstract: A method for pairing a first element and a second element, wherein the first element and the second element form a first decoding system among a plurality of receiving decoding systems in a broadcasting network. Each receiving decoding system is adapted to descramble scrambled audiovisual information received over the broadcasting network. A first key unique in the broadcasting network is selected. A second key is determined according to the first key, such that a combination of the first key and the second key enables to decrypt broadcasted encrypted control data that is received to be decrypted by each receiving decoding system, the encrypted control data being identical for each receiving decoding system. The first key and the second key are assigned respectively to the first element and the second element.

Abstract: This invention relates to a transmission method for conditional access content, in which said content is broadcast in the form of data packets (DP). These data packets contain at least one marker having a known value and a useful part (PL). This method includes the following steps: extraction of said marker (Mc) from the data packet (DP) and replacement of this marker with an encryption key identification information (PAR); encryption of said useful part (PL) by an encryption key (K1) that can be identified by said encryption key identification information (PAR); formation of an encrypted data packet containing at least said encryption key identification information (PAR) and the encrypted useful part (PLK1); transmission of said encrypted data packet to at least one receiver.

Abstract: A method of transmitting authorization messages to a plurality of mobile receivers comprises the steps of defining at least one set of authorization messages, a first part of which, forming a first message category, is intended for a first group of mobile receivers, a second part of which, forming a second message category, is intended for a second group of mobile receivers; creating a first authorization message packet containing at least the first part of the set of authorization messages; creating a second authorization message packet containing at least the second part of the set of authorization messages; transmitting the first authorization message packet over a first service, without previously sending information indicating to which mobile receivers the message packets are directed; and transmitting the second authorization message packet over a second service without previously sending information indicating to which mobile receivers the message packets are directed.

Abstract: The invention concerns a method for transmitting a flow of digital data and of controlled messages associated with said flow addressed to mobile terminals. The flow comprises successive bursts of data of encrypted contents with control words included in the control messages transmitted in parallel with said flow. The method is characterized in that it consists in inserting a control message in each transmitted burst of contents, said message containing at least one control word designed to decrypt the contents of said burst.

Abstract: A method of verification of rights is disclosed, contained in a security module associated to an apparatus processing broadcasted digital data. The apparatus is connected to a management center transmitting encrypted rights messages for accessing the digital data. The method includes reception and reading by the security module of all or part of a rights message including at least one right and means for verifying the right, decryption and verification of the rights message and updating of a rights memory, and storage of all or part of the rights message in a messages memory. During a further verification step, the method includes identification of at least one right present in the rights memory, search of the corresponding stored rights message and verification of the rights message, comparison of the right contained in the rights message with the corresponding right stored in the rights memory, and determination of a default state when the result of the comparison indicates a difference.

Abstract: A method embeds tracing secret data into multimedia contents delivered to particular users. The method descrambles a first scrambled video stream having alternate values to obtain a personalized video stream corresponding to an original video stream by a decoder comprising at least a security unit and a descrambling unit, the personalized video stream being obtained by restoring the alternate values by personalized values taking into account an internal parameter on the security unit and received control data containing the original values and their location in the modified stream.

Abstract: Example embodiments relate to an encryption and decryption method for a conditional access content, including (a) extracting a marker (Mc) from a data packet (DP); (b) creating a first marking block including the marker (Mc) and a second padding value (PAD2); (c) encrypting the first marking block with a second encryption key (K2); (d) encrypting a second encrypted marking value (MK2) of the first encrypted marking block; (e) creating a mixed marking block including the second encrypted marking value (MK2) a the first encrypted padding element (PADK1); (f) decrypting the mixed marking block a device of the first encryption key (K1), in order to obtain a decrypted mixed marking block; (g) extracting a predetermined part of the decrypted mixed marking block; (h) comparing the extracted part with a reference value (Mc; PDV2); and (i) if the comparison leads to an identity, determining a new set of encryption parameters different to the first set of encryption parameters and repeating steps b) to h) in which the

Abstract: The present invention concerns a method for distribution of the load of a managing center transmitting information to a great number of user units, each unit receiving information after a request carried out while connecting to the managing center, characterized in that it comprises following steps: determining by the managing center of a number of units to process with said information, determining of a time period during which said number of units has to be processed, transmitting of a message to the user units comprising on one hand, the probability of connection of a unit to the managing center based on the number of units previously determined and on the other hand, the time period previously determined during which the unit connects according to said probability.

Abstract: A process for distributing a marked audiovisual sequence from a nominal audiovisual sequence towards a receiver, said nominal audiovisual sequence having a nominal content, comprising: generating a marked audiovisual sequence according to a first mark applied to initial content at marking positions; generating a modified stream having a modified content different from the nominal content at least at marking positions; generating a complementary stream so that it is possible to reconstitute the marked audiovisual sequence from the modified stream; and transmitting the modified stream and the complementary stream towards the receiver wherein, on the receiver, a reconstitution of the audiovisual sequence, comprises calculating new complementary data according to the marking positions and the complementary stream so that it is possible to create an audiovisual sequence marked with a second mark from the modified stream, wherein the second mark, being different from the first mark, is applied to the initial conten

Abstract: This invention relates to a method for processing control messages from a set of control messages intended to access an encrypted content received in the form of a stream by a multimedia unit. These messages include at least a discrimination parameter having a different value for two consecutive messages in the stream and access data to encrypted content. The method comprises steps for receiving a current control message, for reading the discrimination parameter from the current control message, for retrieving in a memory, the discrimination parameter from the message processed previously to the current message, for comparing the discrimination parameter of the current message with the previously processed message discrimination parameter, and for blocking said current control message by the filter if the comparison step indicates that the discrimination parameter of the current message is identical to the discrimination parameter of the previously processed message.

Abstract: The present invention concerns a method for distribution of the load of a managing center transmitting information to a great number of user units, each unit receiving information after a request carried out while connecting to the managing center, characterized in that it comprises following steps: determining by the managing center of a number of units to process with said information, determining of a time period during which said number of units has to be processed, transmitting of a message to the user units comprising on one hand, the probability of connection of a unit to the managing center based on the number of units previously determined and on the other hand, the time period previously determined during which the unit connects according to said probability.