SYSTEM AND METHOD FOR USING A STREAMING PROTOCOL
First Claim
1. A method of distributing content using a distribution point, the method comprising:
- receiving an instruction to distribute a stream of content on a distribution point;
providing the distribution point with the stream of content;
receiving a sequence of initialization vectors for the stream of content, with each initialization vector in the sequence of initialization vectors representing a setting for a particular portion of content to which a decryption engine should be set in order to decrypt the content using a key;
receiving, from an application server, an indication that a request from a client device should be supported;
receiving, from the client device and across a communications network, the request from the client device to access the stream of content;
enabling, based on receiving the indication, the client device to access the stream of content in a connection between the client device and the distribution point;
accessing, from within the request, a time mark with a temporal description of which portion of the stream of content should be transmitted to the user;
relating the time mark to the sequence of initialization vectors;
selecting a provided initialization vector from within the sequence of initialization vectors; and
transmitting the provided initialization vector to the client device across the connection in a first metadata message.
5 Assignments
0 Petitions
Accused Products
Abstract
An initialization vector (IV) is employed to decrypt a block of a stream that has been encrypted with Cypher Block Chaining (CBC) encryption, without requiring decryption of previous blocks within the stream. For example, a listener who accesses a distribution point to retrieve encrypted content authenticates himself to an application server that regulates access to encrypted content on the distribution point, and responsively receives a key. The listener then requests access to a reference point within the encrypted content stream somewhere after its beginning (e.g., using preview clips). The distribution point relates the reference point to a corresponding block of the encrypted stream, and identifies an IV previously used for encryption of that block. The distribution point provides the associated encrypted block of content and the IV to the listener to enable mid-stream rendering of the encrypted content, without requiring the listener to decrypt previous blocks within the encrypted stream.
9 Citations
15 Claims
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1. A method of distributing content using a distribution point, the method comprising:
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receiving an instruction to distribute a stream of content on a distribution point; providing the distribution point with the stream of content; receiving a sequence of initialization vectors for the stream of content, with each initialization vector in the sequence of initialization vectors representing a setting for a particular portion of content to which a decryption engine should be set in order to decrypt the content using a key; receiving, from an application server, an indication that a request from a client device should be supported; receiving, from the client device and across a communications network, the request from the client device to access the stream of content; enabling, based on receiving the indication, the client device to access the stream of content in a connection between the client device and the distribution point; accessing, from within the request, a time mark with a temporal description of which portion of the stream of content should be transmitted to the user; relating the time mark to the sequence of initialization vectors; selecting a provided initialization vector from within the sequence of initialization vectors; and transmitting the provided initialization vector to the client device across the connection in a first metadata message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification