摘要:
A method allows a broadcasted conditional access content accessible at the time of transmission to be also accessible at a later time thanks to intermediate storage on a hard disk of a user unit. The processing method includes the steps of receiving at the user unit a data stream encrypted by at least one control word, at least one control message stream containing the control words, forming an index file, each index comprising an identifier of a control message formed by the extraction of data associated to the control messages and an identifier of the part of the content to which the control message is applied; and, at the time of the deferred processing of the content, extracting at least one part of the control messages and resynchronizing the content with the control messages by the use of the index file, the identifier of the control message allowing the selection of the current control message from a set of control messages at the time of the exploitation of the content identified by the identifier of the part of the content related to this control message.
摘要:
A method allows a broadcasted conditional access content accessible at the time of transmission to be also accessible at a later time thanks to intermediate storage on a hard disk of a user unit. The processing method includes the steps of receiving at the user unit a data stream encrypted by at least one control word, at least one control message stream containing the control words, forming an index file, each index comprising an identifier of a control message formed by the extraction of data associated to the control messages and an identifier of the part of the content to which the control message is applied; and, at the time of the deferred processing of the content, extracting at least one part of the control messages and resynchronizing the content with the control messages by the use of the index file, the identifier of the control message allowing the selection of the current control message from a set of control messages at the time of the exploitation of the content identified by the identifier of the part of the content related to this control message.
摘要:
The invention concerns a method for providing a plurality of receivers with conditional access to broadcast services using a simplified means for managing the control messages required by such conditional access schemes. The method involves providing all information which will allow a registered receiver having the necessary decryption key to access the services without having any prior rights loaded locally. A management center keeps a register of all subscribed receivers, including a list of services to which the receiver is subscribed, and encrypts the services using control words encrypted by the necessary keys. Control messages comprising the control words for decryption are provided within a special channel to which the receiver has permanent access, the special channel being a different one from channels used for broadcasting audio/video services.
摘要:
This invention relates to a management method for conditional access data processing by at least two decoders associated to a subscriber. These decoders include activation/deactivation means for conditional access data processing and local communication means structured to allow communication between the subscribers' decoders. This process comprises a reception step, by a first decoder's local communication means (10), of at least one message originating from at least a second decoder (STB) associated to said subscriber. Then, it comprises a step to determine the minimum number of different decoders of said subscriber from which said first decoder must receive messages, and a comparison step between on one hand the number of different decoders from which said first decoder has received a message and on the other hand the minimum number of decoders from which said first decoder must receive a message. Conditional access data processing by said first decoder (STB) is deactivated if the latter has not received messages from the required number of different decoders. The invention also concerns a decoder that allows the implementation of the method according to the invention and characterized in that it includes local communication means (10) structured to transmit messages to other decoders and to receive messages originating from said other decoders, and processing means for messages received by said local communication means (10).
摘要:
One embodiment of the invention relates to a management method for conditional access data processing by at least three decoders associated to a subscriber. These decoders include activation/deactivation means for conditional access data processing and local communication means structured to allow communication between the subscribers' decoders. This method comprises a reception step, a determination step, and a comparison step. In addition conditional access data processing by said first decoder (STB) is deactivated if the latter has not received messages from the required number of different decoders. Another embodiment of the invention relates to a decoder that allows the implementation of the method according to the invention and characterized in that it includes local communication means (10) structured to transmit messages to other decoders and to receive messages originating from said other decoders, and processing means for messages received by said local communication means (10).
摘要:
A method for conditional access to a digital data stream encrypted with at least one control word and broadcasted to at least one mobile device, said transmitter also transmitting a control message stream containing control words and access conditions, said mobile device being connected to a mobile communication network via a mobile access point, comprises: receiving the control message stream by the mobile device; determining a location identifier for the said mobile device by either the identifier of the mobile access point or the identifier of the broadcasting network transmitter; verifying access conditions contained in the control message, said access conditions comprising a reception condition related to a mobile access point identifier and/or an identifier of one broadcasting network transmitter; comparing the determined identifier with the identifier(s) contained in the access conditions; and authorizing or blocking the access to said data stream depending on the result of the comparison.
摘要:
This invention proposes to realise a method for generation of packets intended for at least one mobile receiver.According to a first variant of the invention, the process includes the steps of receiving an encrypted stream representing a service, this stream comprising at least a data channel and a control message ECM channel; slicing said stream to send it in packets to the mobile receiver; extracting the control message channel of this sliced stream; forming a block containing at least the data channel, compatible with the diffusion to said mobile receiver; extracting from said sliced stream of at least one control message of the control message channel and introducing said extracted control message into the block, in order to form a packet.According to a second variant, the process includes the steps of reception of an encrypted stream representing a service, this stream comprising at least a data channel and a control message ECM channel; cutting of said stream to send it in packets to the mobile receiver; formation from said cut stream of a block comprising at least the data channel and the control message channel, compatible with the diffusion to said mobile receiver; determination of the identical messages of the control message channel repeated in said block and elimination of at least some of said identical repeated messages, at the same time as conserving at least one of said identical repeated messages.
摘要:
A method that allows the optimization of the consumption of conditional access content in order to guarantee less vulnerable right messages involves three steps: the selection by the user of a content and the indication of this interest to said management center; the sending of a notification message containing or indicating the access authorisation message shortly before the broadcast of said content and storage of this authorisation message; and the sending of the content itself and the use of the data of the authorisation message in order to access the data of the content. There may be a fourth stage, namely the validation of the authorisation message by the user. This validation is executed in general at the time of the reception of the content or alternatively the user confirms their intention to purchase.
摘要:
A method is proposed for creating a secure and authenticated channel between a multimedia processing device and a security module that can be shared between several entities, the data transmitted to one entity not compromising the other entities. The a protection method, for data exchanged between a multimedia processing device including a personal key and a security module managed by a management centre, includes determination of an identifier pertaining to an entity representing a group of multimedia processing devices, calculation of a security key formed by a one-way operation based on the personal key of the multimedia processing device and the entity identifier, and transmission of this security key to the security module connected to the entity. A security key is then formed between the multimedia processing device and the security module, by means of the reception of the entity by the multimedia processing device. The multimedia processing device then calculates the security key by a one-way operation based on the personal key of the multimedia processing device and the entity identifier. Finally, the key is used to secure the data exchanged between the multimedia processing device and the security module.
摘要:
A method for conditional access to a digital data stream encrypted with at least one control word and broadcasted to at least one mobile device, said transmitter also transmitting a control message stream containing control words and access conditions, said mobile device being connected to a mobile communication network via a mobile access point, comprises: receiving the control message stream by the mobile device; determining a location identifier for the said mobile device by either the identifier of the mobile access point or the identifier of the broadcasting network transmitter; verifying access conditions contained in the control message, said access conditions comprising a reception condition related to a mobile access point identifier and/or an identifier of one broadcasting network transmitter; comparing the determined identifier with the identifier(s) contained in the access conditions; and authorizing or blocking the access to said data stream depending on the result of the comparison.