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1. 发明授权

US11259057B2 Methods, devices and system for generating a watermarked stream 有权
公开(公告)号：US11259057B2
公开(公告)日：2022-02-22
申请号：US16309158
申请日：2017-06-13
申请人： Nagravision S.A.
发明人： Yann Bieber
IPC分类号： H04N21/2389 , H04N21/236 , H04N21/44 , H04N21/4623 , H04N21/266 , H04N21/8358 , H04N21/845
摘要： A device (40) for generating a watermarked stream (39), comprising: at least one input interface (41) configured to receive encrypted control messages (20) and conditional access streams (30) including a main stream (33) and protected watermarking data streams (35) from which a watermarking information (38) can be embedded in said watermarked stream (39); a security module (43) configured to process said control messages (20) and to control access to said conditional access streams (30); a descrambler (45) configured to remove protection applied on at least some of said conditional access streams (30); a watermarking unit (47) configured to generate the watermarked stream (39) from said conditional access streams (30) by selectively processing said watermarking data streams (35) depending on access data (AC, AR) included in some of said control messages (20).

2. 发明授权

US09749665B2 Method and device for distributing multimedia licences within a distribution system of a secured multimedia service 有权
公开(公告)号：US09749665B2
公开(公告)日：2017-08-29
申请号：US15033275
申请日：2014-10-09
申请人： NAGRAVISION S.A.
发明人： Blaise Lugeon , Yann Bieber
IPC分类号： H04N21/23 , H04N21/2347 , H04N21/24 , H04N21/254 , H04N21/258 , H04N21/266 , H04N21/4627 , H04N21/643
CPC分类号： H04N21/2347 , H04N21/2405 , H04N21/2541 , H04N21/25816 , H04N21/26613 , H04N21/4627 , H04N21/64322
摘要： Method for distributing multimedia licenses by a server to a plurality of user devices in a distribution system of a multimedia service, the access of which is protected by a first protection. This method comprising verifying that computing resources used by the server do not exceed a maximal threshold, if so, generating and then transmitting regular licenses including said first protection in response to user device requests, otherwise switching the server to a singular mode of distribution aiming to protect the access to the multimedia service using a second protection, independent of the first protection; to generate and to transmit to the devices one singular license comprising the second protection; to verify that the computing resources do not exceed the maximal threshold, if so, to switch from the singular mode to a regular mode so as to protect the access to the multimedia content using only said first protection.

3. 发明授权

US11575977B2 Secure provisioning, by a client device, cryptographic keys for exploiting services provided by an operator 有权
公开(公告)号：US11575977B2
公开(公告)日：2023-02-07
申请号：US17012440
申请日：2020-09-04
申请人： NAGRAVISION S.A.
发明人： Yann Bieber , André Nicoulin
IPC分类号： H04L9/08 , H04N21/835 , H04L9/16 , H04N7/167 , H04N21/6334 , H04N21/4405 , H04L9/14
摘要： A method for securely receiving a multimedia content by a client device operated by one or more operator(s) involving a dedicated provisioning server of a security provider managing symmetric secrets used by the client devices and operators license servers. The provisioning server provides to the client device one or more generations of operator specific unique device secrets, which are then exploited by the various operators' license servers to deliver licenses such that authorized client devices can consume protected multimedia contents.

4. 发明授权

US08879739B2 Method, system and device for securely transferring digital content between electronic devices within a communication network managed by a management center 有权
标题翻译：用于在由管理中心管理的通信网络内的电子设备之间安全地传送数字内容的方法，系统和设备
公开(公告)号：US08879739B2
公开(公告)日：2014-11-04
申请号：US13737094
申请日：2013-01-09
申请人： Nagravision S.A.
发明人： Yann Bieber
IPC分类号： H04L9/12 , H04L9/08 , H04L29/12
CPC分类号： H04L9/08 , H04L9/0822 , H04L9/0833 , H04L9/0869
摘要： A method for securely transferring digital content between two electronic devices, comprising an activation phase performed by a management center for generating a common network key, calculating for each device an encrypted network key with a unique device key and transmitting to each device the encrypted network key and a unique device value involving said device key and a unique device secret value, a keys recovering performed by each device for obtaining the device key from both the device value and the secret value of said device and obtaining the network key from both the encrypted network key and the previously obtained device key, and an operating phase performed by each device for generating or obtaining a random value, generating a final key by encrypting the random value with the network key and using said final key for encrypting/decrypting said content.
摘要翻译：一种用于在两个电子设备之间安全地传送数字内容的方法，包括由管理中心执行的用于生成公共网络密钥的激活阶段，使用唯一的设备密钥为每个设备计算加密的网络密钥，并向每个设备发送加密的网络密钥以及涉及所述设备密钥和唯一设备秘密值的独特设备值，由每个设备执行的密钥恢复，以从设备值和所述设备的秘密值获得设备密钥，并从加密网络密钥和先前获得的设备密钥，以及由每个设备执行的用于生成或获取随机值的操作阶段，通过用网络密钥加密随机值并使用所述最终密钥来加密/解密所述内容来生成最终密钥。

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