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发明公开
CN110476432A 监视媒体的保护 有权

监视媒体的保护
摘要：
媒体设备从服务提供商接收域密钥。所述媒体设备还使用媒体密钥对媒体进行加密，并使用所述域密钥对所述媒体密钥进行加密，以形成加密的媒体令牌：将受保护的媒体密钥封装在加密的媒体令牌中。然后，所述服务提供商可以接收加密的媒体令牌和与接收实体有关的一个或多个接收实体标识符，并确定所述接收实体是否有权访问来自所述媒体设备的媒体。如果所述接收实体有权访问来自所述媒体设备的媒体，则所述服务提供商使用所述域密钥来解密加密媒体令牌以获得所述媒体密钥并将所述媒体密钥提供给所述接收实体。这样，认证的接收实体可以获得解密所述媒体所必需的所述媒体密钥。此外，不需要任何中间实体具有类似的访问，因此在媒体从媒体设备到接收实体的整个传输过程中，由所述媒体密钥提供的加密是就位的。
摘要（英）：

A media device receives a domain key from a service provider. The media device further encrypts media with a media key and encrypts the media key with the domain key to form an encrypted media token:the protected media key is encapsulated in an encrypted media token. The service provider may then receive the encrypted media token and one or more receiving entity identifiers relating to a receiving entity and ascertain whether the receiving entity is entitled to access media from the media device. If the receiving entity is entitled to access media from the media device, the service provider decrypts the cryptographic media token using the domain key to obtain the media key and providing the media key to the receiving entity. As such, an authenticated receiving entity may obtain the mediakey necessary to decrypt the media. Moreover, there is no requirement for any intermediate entity to have similar access and thus the encryption provided by the media key is in place throughout the transport of the media from media device to receiving entity.

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