Método y aparato para gestión de derechos de grano fino de contenido de flujo continuo

摘要

The present invention relates to the delivery of protected streaming content from a broadcaster to a receiving device. The streaming content (403, 405, 407) is encrypted with a traffic key. The traffic key is provided to the users via a key stream message (409) encrypted with a service key. The user obtains at least one rights object from a rights issuers and the at least one rights object includes the service key so that the streaming content may be used. The at least one rights object also contains information regarding usage rights that may be configured by the rights issuer so that, depending on the user and/or the receiving device, different rights may be available. The key stream message may include a program category variable value that indicates the type of content and in conjunction with the rights object, determines what usage rights exist for the streaming content.