Fine grain rights management of streaming content

摘要

The present invention provides methods, apparatuses, and systems for delivering protected streaming content to a receiving device. In an aspect of the present invention, a broadcaster provides streaming content. To ensure viewers are properly authorized, the streaming content is encrypted with a traffic key. The traffic key is provided to the users via a key stream message, which is 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.

主权项

1. A method comprising:
(A) receiving, by a device, a stream of encrypted data corresponding to a single broadcast service from a communications system, the data having different portions encrypted, respectively, by a plurality of traffic keys; (B) receiving, by the device, an encrypted key stream message, the encrypted key stream message including the plurality of traffic keys, wherein the encrypted key stream message is separate from the stream of encrypted data; and (C) decrypting, by the device, the respective portions of the stream of encrypted data using the plurality of traffic keys.