Managed content distribution systems and methods
View Patent ↗This disclosure relates to, among other things, systems and methods for managing the secure management and distribution of electronic content over broadcast and/or broadband communication channels. Certain embodiments disclosed herein may allow for implementation of a digital rights management service in connection with bidirectional communication channels and/or unidirectional communication channels, such as a broadcast signal. Various embodiments may allow for the generation and/or transmission of a digital rights management license in a field included in a broadcast signal. The license may be used by a client device to securely manage a received broadcast signal in accordance with associated rules and/or rights.
1. A method for managing electronic content performed by a connected broadcast device, the connected broadcast device comprising a processor and a non-transitory computer-readable medium storing instructions that, when executed by the processor, cause the client device to perform the method, the method comprising:
receiving, by the connected broadcast device from a broadcast channel, a broadcast content stream, the broadcast content stream comprising a plurality of encrypted content packets and at least one license information packet;
receiving, at the connected broadcast device, a request to render the broadcast stream;
decrypting a content key included in the at least one license information packet using, at least in part, a device key associated with the connected broadcast device;
determining that at least one requirement specified in the license information packet has been satisfied, the at least one requirement comprising at least one output obligation requirement;
in response to the determination, descrambling at least a portion of the broadcast content stream using, at least in part, the decrypted content key; and
rendering the descrambled broadcast content stream.
2. The method of claim 1 , wherein the broadcast content stream comprises an MPEG2-encoded transport stream.
3. The method of claim 1 , wherein the connected broadcast device is further configured to receive information from a broadband channel.
4. The method of claim 1 , wherein descrambling the broadcast content stream comprises decrypting the plurality of encrypted content packets using the decrypted content key.
5. The method of claim 1 , wherein the method further comprises:
determining that the at least one license information packet has been compressed; and
decompressing the at least one license information packet.
6. The method of claim 1 , wherein the at least one license information packet comprises a binary formatted packet.
7. The method of claim 1 , wherein the at least one license information packet comprises an object notation formatted packet.
8. The method of claim 1 , wherein the device key comprises a private device key.
9. The method of claim 8 , wherein the private device key comprises a derived key.
10. The method of claim 9 , wherein the private device key comprises a key derived from a private manufacturer key unique to the connected broadcast device.
11. The method of claim 1 , wherein the at least one requirement further comprises a requirement that the license information packet is determined to be valid based on an expiration date included in the at least one license information packet.
12. The method of claim 1 , wherein the method further comprises decrypting a session key included in the license information packet using the device key.
13. The method of claim 12 , wherein the method further comprises verifying a signature of at least a portion of the license information packet using the decrypted session key.
14. The method of claim 12 , wherein the method further comprises decrypting the content key using the decrypted session key.
15. The method of claim 12 , wherein the method further comprises decrypting an encrypted control word included in the license information packet using the decrypted content key.
16. The method of claim 15 , wherein descrambling the broadcast content stream comprises decrypting the plurality of encrypted content packets using the decrypted control word.
17. The method of claim 1 , wherein the connected broadcast device comprises a television.
18. The method of claim 1 , wherein the connected broadcast device comprises a set top box.