System and method for implementing content protection in a wireless digital system

• US 8,744,081 B2
• Filed: 03/12/2008
• Issued: 06/03/2014
• Est. Priority Date: 03/22/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Christison, Gregory L.
• Primary Examiner(s): Zecher, Cordelia
• Assistant Examiner(s): AVERY, JEREMIAH L
• Application Number:
  US12/046,548
• Publication Number:
  US 20080232588A1
• Time in Patent Office: 2,274 Days
• Field of Search: None
• US Class Current: 380/270
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 63/0464 using hop-by-hop encryption, i.e. wherein an intermediate entity decrypts the information and re-encrypts it before forwarding it
• 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: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/4408 involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
• CPC Class Codes: H04W 12/033 of the user plane, e.g. user's traffic

Abstract

A system includes a line-based receiver for receiving protected content from a source and a line-based transmitter for providing the protected content to a destination. The protected content is secure, such as by using a High-bandwidth Digital Content Protection (HDCP) mechanism. Between the line-based transmitter and receiver is a wireless transmitter and a wireless receiver. The wireless transmitter establishes an encrypted wireless link with the wireless receiver according to a second encryption mechanism. The wireless transmitter is further configured for receiving the protected content from the line-based receiver, encrypting the protected content according to the second encryption mechanism, and wirelessly transmitting the encrypted protected content. The wireless receiver is further configured for receiving the wirelessly transmitted protected content from the wireless transmitter and decrypting the protected content according to the second encryption mechanism.

Claims

1. A system comprising:

a line-based receiver for receiving protected content from a source, the received protected content being encrypted according to a first encryption mechanism;

a wireless transmitter for establishing a secure wireless link with a wireless receiver according to a second encryption mechanism, wherein the wireless transmitter is further configured for receiving the protected content from the line-based receiver, encrypting the protected content according to the second encryption mechanism, and wirelessly transmitting the encrypted protected content over the secure wireless link;

the wireless receiver for establishing the secure wireless link with the wireless transmitter, the wireless receiver being further configured for receiving the wirelessly transmitted encrypted protected content from the wireless transmitter and decrypting the received encrypted protected content according to the second encryption mechanism to output the protected content; and

a line-based transmitter for receiving the protected content from the wireless receiver and transmitting the protected content to a destination, the transmitted protected content being still encrypted according to the first encryption mechanism.

2. The system of claim 1, wherein one of the line-based receiver and the wireless transmitter is further configured to encrypt the protected content according to the first encryption mechanism, and wherein one of the wireless receiver and the line-based transmitter is further configured to decrypt the protected content according to the first encryption mechanism.

3. The system of claim 1 further comprising:

a High-bandwidth Digital Content Protection (HDCP) message handling device for establishing a content-protected connection between the source and the destination;

wherein the line-based receiver is an HDCP receiver coupled to said wireless transmitter by a HDCP link; and

wherein the line-based receiver is further coupled to the source.

4. The system of claim 1 wherein at least one of the line-based receiver and the line-based transmitter uses line-based video transmission.

5. The system of claim 1, further comprising:

a High-bandwidth Digital Content Protection (HDCP) message handling device for establishing a content-protected connection between the source and the destination;

wherein the line-based receiver is a High-bandwidth Digital Content Protection (“

HDCP”

) compliant receiver; and

wherein said line-based receiver, said wireless transmitter, said wireless receiver, said line-based transmitter and said HDCP message handling device are configured to operate together as an HDCP repeater.

6. The system of claim 1 wherein the line-based transmitter is a High-bandwidth Digital Content Protection (“

HDCP”

) compliant transmitter.

7. The system of claim 1 wherein the first encryption mechanism is an HDCP encryption mechanism.

8. The system of claim 1 wherein the second encryption mechanism is Advanced Encryption Standard (“

AES”

).

21. The system of claim 1, wherein said source is a satellite receiver and said destination is a television.

9. A method for providing a secure content delivery mechanism for protectable subject matter (PSM), the method comprising:

receiving, at a first receiver, the PSM encrypted according to a first encryption mechanism (PSM1) dictated by a source over a first wired link;

converting the PSM1 to a PSM encrypted according to a second encryption mechanism (PSM2), wherein the second encryption mechanism is different from the first encryption mechanism;

transmitting, using a wireless transmitter, the PSM2 via a secure wireless link;

receiving, at a wireless receiver, the wirelessly transmitted PSM2;

converting the received PSM2 back to the PSM1; and

transmitting, using a transmitter, the converted PSM1 message to a destination over a second wired link.

10. The method of claim 9 wherein converting the PSM1 to PSM2 includes encrypting the PSM1 according to the second encryption mechanism.

11. The method of claim 9 further comprises:

establishing the secure wireless link; and

authenticating the secure wireless link.

12. The method of claim 11 wherein the step of establishing the secure wireless link comprises utilizing a session key.

13. The method of claim 12 wherein the converting the PSM1 to the PSM2 and the converting the received PSM2 back to the PSM1 comprises utilizing the session key.

14. The method of claim 9 wherein the first encryption mechanism is High-bandwidth Digital Content Protection (HDCP) and the second encryption mechanism is Advanced Encryption Standard (AES).

15. The method of claim 9 further comprising:

performing message handling between the source and the destination to establish a secure content delivery mechanism therebetween.

16. The method of claim 9 wherein the first receiver is an HDCP receiver being integrated with the source.

17. The method of claim 16, wherein the transmitter is an HDCP transmitter being integrated with the destination.

22. The method of claim 9, wherein said source is a satellite receiver and said destination is a television.

18. A system comprising:

means for receiving protected content from a source via a wired link, the received protected content being encrypted according to a first encryption mechanism;

wireless transmitter means for wirelessly establishing a secure wireless link with a wireless receiver means according to a second encryption mechanism, for receiving the protected content from the means for receiving, for encrypting the protected content according to the second encryption mechanism, and for wirelessly transmitting the encrypted protected content over the secure wireless link;

the wireless receiver means for establishing the secure wireless link with the wireless transmitter means, for receiving the wirelessly transmitted protected content from the wireless transmitter means, and for decrypting the received encrypted protected content according to the second encryption mechanism to output the protected content; and

transmitter means for receiving the protected content from the wireless receiver means and for transmitting the protected content via a wired link to a destination, the transmitted protected content being still encrypted according to the first encryption mechanism.

19. The system of claim 18, wherein one of the means for receiving protected content from the source via a wired link or the wireless transmitter means is configured to encrypt the protected content according to the first encryption mechanism, and wherein one of the wireless receiver means and the transmitter means is further configured to decrypt the protected content according to the first encryption mechanism.

20. The system of claim 18, further comprising:

means for handling High-bandwidth Digital Content Protection (HDCP) messages to establish a content-protected connection between the source and the destination;

wherein the means for receiving the protected content from the source is an HDCP receiver coupled to said wireless transmitter means by a HDCP link; and

wherein the means for receiving the protected content is further coupled to the source.