System and methods for providing live streaming content using digital rights management-based key management

• US 8,949,592 B2
• Filed: 03/23/2012
• Issued: 02/03/2015
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Moroney, Paul, Shamsaasef, Rafie
• Primary Examiner(s): NGUYEN, TU T
• Application Number:
  US13/429,266
• Publication Number:
  US 20120246462A1
• Time in Patent Office: 1,047 Days
• Field of Search: 713/151
• 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, the method comprising:

encrypting, by the server device comprising a processor, live streaming content using a key established by the DRM-based key management;

segmenting the encrypted live streaming 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 sent to an application of the client device; and

sending the encrypted live streaming content to the client device, wherein the server device is configured to perform operations comprising;

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

deriving a first new DRM-based live streaming content key based, at least, in part, on a change in content control copy information associated with the channel change request.

2. The method of claim 1, wherein the encrypted live streaming content is sent to a media player of the client device in response to Advanced Encryption Standard 128-bit Cypher Block Chaining (AES 128 CBC) being employed for the encryption.

3. The method of claim 1, wherein the encrypted live streaming content is sent to the application of the client device in response to Advanced Encryption Standard 128-bit Electronic Code Book (AES 128 ECB) MPEG 2 Transport Stream (MP2TS) encryption being employed.

4. The method of claim 1, wherein the receiving and the processing a channel change request from the client device further comprises:

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

obtaining new CCI data; and

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

5. The method of claim 1, wherein the deriving the first new DRM-based live streaming content key further comprises:

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

6. The method of claim 5, further 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 second new DRM-based live streaming content key in response to the detected parameter;

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

segmenting the encrypted live streaming content; and

creating another playlist comprising at least a second URI associated with the second new DRM-based live streaming content key.

7. The method of claim 6, wherein the detected parameter comprises a change in copy control information.

8. The method of claim 6, wherein the detected parameter comprises an amount of time the DRM-based live streaming content key has been used.

9. The method of claim 6, wherein the detected parameter comprises a program boundary.

10. The method of claim 1, wherein the URI provides a reference to the DRM-based live streaming content key.

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

sending, by the client device comprising a processor, a request for a playlist from a media player of the client device;

receiving the playlist, at an application of the client device, 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;

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

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

receiving a playlist URI from the server;

storing, after establishing the DRM-based live streaming content key, a temporary rights data file that includes a subkey used to derive a content decryption key; and

parsing the playlist to determine an applied encryption type.

12. The method of claim 11, wherein the DRM-based live streaming content key is sent from the application of the client device to the media player of the client device using Secure Socket Layer (SSL) encryption over Secure HyperText Transfer Protocol (HTTPS).

13. The method of claim 12, wherein the plurality of encrypted segments are decrypted, decoded, and presented by the media player.

14. The method of claim 11, wherein the application decrypts the plurality of encrypted segments using the DRM-based live streaming content key to produce decrypted content segments.

15. The method of claim 14, wherein the decrypted content segments are sent from the application to the media player of the client device.

16. The method of claim 11, wherein the tune channel command includes a channel identifier.

17. The method of claim 16, 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.

18. The method of claim 16, 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.

19. The method of claim 11, further comprising:

receiving another playlist comprising another Uniform Resource Identifier (URI) and a new DRM-based live streaming content key.