Method, manufacture, and apparatus for content decryption module

• US 8,891,765 B1
• Filed: 12/11/2012
• Issued: 11/18/2014
• Est. Priority Date: 12/12/2011
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Dorwin, David Kimbal
• Primary Examiner(s): Najjar, Saleh
• Assistant Examiner(s): Korsak, Oleg
• Application Number:
  US13/710,940
• Time in Patent Office: 707 Days
• Field of Search: 380/201, 713/156
• US Class Current: 380/201
• CPC Class Codes: G06F 11/3003 Monitoring arrangements specially adapted to the computing system or computing system component being monitored
• CPC Class Codes: G06F 21/105 Arrangements for software license management or administration, e.g. for managing licenses at corporate level
• CPC Class Codes: G06F 21/1062 Editing
• CPC Class Codes: G06F 21/1073 Conversion
• CPC Class Codes: G06F 21/50 Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
• CPC Class Codes: G06F 21/60 Protecting data
• CPC Class Codes: G06F 21/602 Providing cryptographic facilities or services
• CPC Class Codes: G06F 21/62 Protecting access to data via a platform, e.g. using keys or access control rules
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
• CPC Class Codes: G06F 40/143 Markup, e.g. Standard Generalized Markup Language [SGML] or Document Type Definition [DTD]
• CPC Class Codes: G06T 11/00 2D [Two Dimensional] image generation
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: H04L 2209/603 Digital right managament [DRM]
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 2463/103 applying security measure for protecting copyright
• CPC Class Codes: H04L 47/801 Real time traffic
• CPC Class Codes: H04L 47/805 QOS or priority aware
• CPC Class Codes: H04L 63/00 Network architectures or network communication protocols for network security cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00; network architectures or network communication protocols for wireless network security H04W12/00; security arrangements for protecting computers or computer systems against unauthorised activity G06F21/00
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• 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 63/0876 : based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
• CPC Class Codes: H04L 63/102 : Entity profiles
• CPC Class Codes: H04L 65/1101 : Session protocols
• CPC Class Codes: H04L 65/1108 : Web based protocols, e.g. webRTC
• CPC Class Codes: H04L 65/613 : for the control of the source by the destination control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637
• CPC Class Codes: H04L 65/762 : at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 65/80 : Responding to QoS
• CPC Class Codes: H04L 9/0631 : Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
• CPC Class Codes: H04L 9/0861 : Generation of secret information including derivation or calculation of cryptographic keys or passwords
• CPC Class Codes: H04L 9/32 : including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
• CPC Class Codes: H04N 21/2347 : involving video stream encryption
• CPC Class Codes: H04N 21/24 : Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests monitoring of server performance or load G06F11/34; arrangements for observation, testing or troubleshooting for broadcast or for distribution combined with broadcast H04H20/12
• CPC Class Codes: H04N 21/25825 : involving client display capabilities, e.g. screen resolution of a mobile phone optimising the visualisation of content during browsing in the Internet G06F16/9577; processing of terminal status or physical abilities in wireless networks H04W8/22; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/25833 : involving client hardware characteristics, e.g. manufacturer, processing or storage capabilities allocation of resources considering hardware capabilities in multiprogramming arrangements G06F9/5044; allocation of resources considering software capabilities in multiprogramming arrangements G06F9/5055
• CPC Class Codes: H04N 21/41407 : embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/4405 : involving video stream decryption
• CPC Class Codes: H04N 21/4516 : involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available

Abstract

A method, apparatus, and manufacture for a content decryption module (CDM) is provided. A user agent loads a web application. The web application gets a license for encrypted media content. The web application instructs a media stack of the user agent to play the encrypted media content. The license is sent from the web application to the media stack. Next, the license is sent from the media stack to the CDM. The media stack and the CDM are distinct binaries from each other. Encrypted data is sent from the media stack to the CDM. The encrypted data includes at least a portion of the encrypted media content. Next, the CDM provides decrypted data by decrypting the encrypted data.

Claims

1. A method, comprising:

employing a user agent of a client to load a web application;

employing the web application to get a license for encrypted media content;

employing the web application to instruct a media stack of the user agent to play the encrypted media content;

sending the license from the web application to the media stack;

sending the license from the media stack to a content decryption module of the client, wherein the media stack and the content decryption module are distinct binaries from each other;

sending encrypted data from the media stack to the content decryption module, wherein the encrypted data includes at least a portion of the encrypted media content; and

employing the content decryption module to provide decrypted data by decrypting the encrypted data.

2. The method of claim 1, further comprising further employing the content decryption module to perform at least one of digital rights management, content protection, decoding, or de-multiplexing.

3. The method of claim 1, wherein the content decryption module is sandboxed.

4. The method of claim 1, wherein the content decryption module is pluggable.

5. The method of claim 1, wherein the content decryption module is at least one of a browser add-on or an extension.

6. The method of claim 1, wherein the content decryption module is a pluggable extension.

7. The method of claim 1, wherein the content decryption module is a browser plug-in.

8. The method of claim 1, wherein the user agent is a web browser.

9. The method of claim 1, wherein the user agent is based on at least one of HyperText Markup Language (HTML) or a markup language that is derived from HTML.

10. The method of claim 1, wherein employing the web application to get the license for the encrypted media content includes at least one of:

acquiring the license from a server, retrieving the license from the web application, retrieving the license locally, or acquiring the license from a local network.

11. The method of claim 1, wherein the web application is employed to instruct the media stack to the play the media content after the web application is employed to get the license for the encrypted media content.

12. The method of claim 1, wherein employing the web application to get the license for the encrypted media content occurs after the media stack is instructed to play the media content.

13. The method of claim 1, further comprising:

sending a request for a license request from the web application to the media stack;

sending the request for the license request from the media stack to content decryption module;

in response to the content decryption module receiving the request for the license request, sending a license request from the content decryption module to the media stack;

sending the license request from the media stack to the web application, wherein employing the web application to get a license for encrypted media content is performed in response to the web application receiving the license request from the media stack.

14. The method of claim 1, wherein the web application includes at least one of a scripting language, HyperText Markup Language (HTML), or a mark-up language that is derived from HTML.

15. The method of claim 1, further comprising:

sending the decrypted data from the content decryption module to the media stack; and

employing the media stack to render the decrypted data.

16. The method of claim 15, further comprising:

employing the content decryption module to decode the encrypted data before sending the decrypted data to the media stack.

17. The method of claim 1, further comprising:

employing the content decryption module to obtain a content key after the content decryption module receives the license, wherein the decrypting the encrypted data is accomplished employing the content key.

18. The method of claim 17, wherein obtaining the content protection key is accomplished by employing the content decryption module to:

employ a secret key to decrypt the license to obtain the content key, wherein the content decryption module is further employed to protect the secret key and the content key.

19. A client device, comprising:

a memory component for storing data; and

a processing component that is configured to execute data that enables actions, including;

employing a user agent of the client device to load a web application;

employing the web application to get a license for encrypted media content;

employing the web application to instruct a media stack of the user agent to play the encrypted media content;

sending the license from the web application to the media stack;

sending the license from the media stack to a content decryption module of the client device, wherein the media stack and the content decryption module are distinct binaries from each other;

sending encrypted data from the media stack to the content decryption module, wherein the encrypted data includes at least a portion of the encrypted media content; and

employing the content decryption module to provide decrypted data by decrypting the encrypted data.

20. A manufacture, including a tangible processor-readable storage medium having processor-executable code encoded therein, which when executed by one or more processors, enables actions, comprising:

employing a user agent of a client to load a web application;

employing the web application to get a license for encrypted media content;

employing the web application to instruct a media stack of the user agent to play the encrypted media content;

sending the license from the web application to the media stack;

sending the license from the media stack to a content decryption module of the client, wherein the media stack and the content decryption module are distinct binaries from each other;

sending encrypted data from the media stack to the content decryption module, wherein the encrypted data includes at least a portion of the encrypted media content; and

employing the content decryption module to provide decrypted data by decrypting the encrypted data.