SYSTEM AND METHODS FOR PROVIDING LIVE STREAMING CONTENT USING DIGITAL RIGHTS MANAGEMENT-BASED KEY MANAGEMENT

• US 20120246462A1
• Filed: 03/23/2012
• Published: 09/27/2012
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: General Instrument Corporation (CommScope Holding Company, Inc.)
• Inventors: Moroney, Paul, Shamsaasef, Rafie
• Granted Patent: US 8,949,592 B2
• Time in Patent Office: Days
• US Class Current: 713/151
• CPC Class Codes: G06F 21/1012 to domains
• CPC Class Codes: G06F 21/1083 Partial license transfers
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355

Abstract

In the present disclosure, a DRM (in this case IPRM) system may be used to deliver media content keys to a player device in a live streaming environment and take advantage of all DRM related functionalities that come with it, such as proximity control, copy protection enforcement and rights verification. A playlist may be used to deliver a key identifier for encrypted live streaming content.

Claims

1. A method for providing live streaming content using Digital Rights Management (DRM) based key management via a server device, comprising:

encrypting live streaming content using a key established by DRM-based key management;

segmenting the encrypted content;

creating a uniform resource identifier (URI) of a DRM-based live streaming content key, the URI indicating usage of a DRM key management protocol;

sending the URI to a client device in a playlist; and

sending the encrypted content to the client device.

2. The method of claim 1, wherein the playlist is sent to an application of the client device.

3. The method of claim 2, wherein when Advanced Encryption Standard 128 bit Cypher Block Chaining (AES-128 CBC) encryption is used, the encrypted content is sent to a media player of the client device.

4. The method of claim 2, wherein when Advanced Encryption Standard 128 bit Electronic Code Book (AES-128 ECB) MPEG-2 Transport Stream (MP2TS) encryption is used, the encrypted content is sent to the application of the client device.

5. A method of claim 2, wherein the server device is also comprising

receiving and processing a channel change request from a client device;

deriving a new DRM-based live streaming content key;

transcoding and encrypting live streaming content using the DRM-based live streaming content key;

6. The method of claim 5, wherein receiving and processing a channel change request from the client device further comprises:

monitoring content copy control information (CCI) to listen for changes; and

obtaining the new CCI data;

generating a new key based in part on the change in CCI;

transcoding and encrypting live streaming content using the new DRM-based live streaming content key;

7. The method of claim 5, wherein deriving the DRM-based live streaming content key further comprises:

creating a rights data file and storing a subkey used to derive the DRM-based live streaming content key.

8. The method of claim 5, wherein the URI provides a reference to the DRM-based live streaming content key.

9. The method of claim 7, comprising:

determining a change in a detected parameter while currently tuned to a channel and using the DRM-based live streaming content key;

deriving a new DRM-based live streaming content key in response to the detected parameter;

transcoding and encrypting live streaming content using the new DRM-based live streaming content key;

segmenting the encrypted content; and

creating a playlist, the playlist comprising at least a URI of the new DRM-based live streaming content key, an encryption method, and a list of a plurality of the encrypted segments, the URI indicating usage of a DRM key management protocol.

10. The method of claim 9, wherein the detected parameter comprises changes in copy control information.

11. The method of claim 9, wherein the detected parameter comprises an amount of time the previous key has been used.

12. The method of claim 9, wherein the detected parameter comprises a program boundary.

13. A method for providing live streaming using Digital Rights Management (DRM) based key management via a client device, comprising:

sending a request for a playlist from a media player of the client device; and

receiving, at an application, the playlist from a server, the playlist comprising at least a Uniform Resource Identifier (URI) of a DRM-based live streaming content key, an encryption method, and a list of a plurality of encrypted content segments, the URI indicating usage of a DRM key management protocol; and

using the DRM key management protocol to establish the DRM-based live streaming content key.

14. The method of claim 13, wherein the DRM-based live streaming content key is sent from the application of the client device to a media player of the client device using Secure Socket Layer (SSL) encryption over Secure HyperText Transfer Protocol (HTTPS).

15. The method of claim 14, wherein the plurality of encrypted segments is decrypted, decoded, and presented by the media player.

16. The method of claim 13, wherein the application decrypts the plurality of encrypted segments using the DRM-based live streaming content key to produce un-encrypted content segments.

17. The method of claim 16, wherein the un-encrypted content segments are sent from the application to a media player of the client device.

18. A method of claim 13, further comprising

sending a tune channel command from a client application of the client device to a server, the tune channel command including a channel identifier;

receiving a playlist URI from the server, after establishing the DRM-based live streaming content key, storing a temporary Rights Data File that includes a subkey used to derive the content decryption key; and

parsing the playlist to determine an applied encryption type.

19. The method of claim 18, further comprising:

decrypting the plurality of encrypted content segments;

generating a new playlist for the media player with an encryption method set to none and having no key URI; and

presenting the new playlist to the media player.

20. The method of claim 18, further comprising:

changing a format of the DRM-based live streaming content key to match a media player of the client device;

generating a new playlist for the media player that includes the applied encryption type with a key uniform resource locator (URI) pointed to a local Secure HyperText Transfer Protocol (HTTPS) server embedded within the client application; and

presenting the new playlist to the media player

21. The method of claim 13, further comprising:

in response to a server changing the content encryption key, receiving a playlist from the server, the playlist comprising at least a Uniform Resource Identifier (URI) of a new DRM-based live streaming content key, an encryption method, and a list of a plurality of encrypted content segments, the URI indicating usage of a DRM key management protocol;

performing a key exchange protocol with the server under the indicated DRM key management system to establish the new key;

storing a temporary Rights Data File that includes a subkey used to derive the new decryption key; and

parsing the playlist to determine an applied encryption type.