Broadcast reception device, operating method of broadcast reception device, conditional access module and operating method of conditional access module

1. A broadcast reception device connected to a conditional access module (CAM) descrambling scrambled broadcast content, the broadcast reception device comprising:

a broadcast receiver configured to receive a broadcast signal comprising scrambled content; and

a controller configured to transmit a first data unit and receive a second data unit,

wherein the first data unit comprises a request for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device and the second data unit comprises a reply to the first data unit.

2. The broadcast reception device according to claim 1 , wherein the first data unit and the second data unit conform to a protocol for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device.

3. The broadcast reception device according to claim 2 , wherein the first data unit and the second data unit comprise information representing data units conforming to the protocol for information on the number of devices.

4. The broadcast reception device according to claim 3 , wherein the second data unit comprises the number of devices that play scrambled content different from the scrambled content played by the broadcast reception device, simultaneously with the broadcast reception device.

5. The broadcast reception device according to claim 1 , wherein messages for information transmission in the first data unit and the second data unit are encrypted or authenticated messages.

6. The broadcast reception device according to claim 1 , wherein the first data unit and the second data unit comprise objects for the information on the number of devices that play the scrambled content simultaneously with the broadcast reception device.

7. The broadcast reception device according to claim 6 , wherein the information on the number of devices that play the scrambled content that is comprised in the second data unit is at least one of information representing that only the broadcast reception device plays scrambled content, information representing that one or more limited devices play scrambled content, and information representing that there is no limitation on the playback of scrambled content.

8. The broadcast reception device according to claim 1 , wherein the first data unit comprises usage rule information (URI) for a request for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device, and

the second data unit comprises a URI message for a reply to the request for the information on the number of devices that play the scrambled content simultaneously with the broadcast reception device.

9. The broadcast reception device according to claim 8 , wherein the URI message includes at least one of information representing that only the broadcast reception device plays the scrambled content, information representing that one or more limited devices play the scrambled content, and information representing that there is no limitation on the playback of the scrambled content.

10. The broadcast reception device according to claim 1 , wherein the controller transmits and receives to and from the CAM a third data unit for a session open for transmitting/receiving the first data unit and the second data unit.

11. An operating method of a broadcast reception device connected to a conditional access module (CAM) descrambling scrambled broadcast content, the operating method comprising:

receiving a broadcast signal comprising scrambled content;

transmitting a first data unit comprising a request for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device; and

receiving a second data unit comprising a reply to the first data unit.

12. The operating method according to claim 11 , wherein the first data unit and the second data unit conform to a protocol for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device.

13. The operating method according to claim 12 , wherein the first data unit and the second data unit comprise information representing data units conforming to the protocol for information on the number of devices.

14. The operating method according to claim 11 , wherein the second data unit comprises the number of devices that play scrambled content simultaneously with the broadcast reception device, and

wherein the scrambled content is different from the scrambled content that the reception device plays.

15. The operating method according to claim 11 , wherein messages for information transmission in the first data unit and the second data unit are encrypted or authenticated messages.

16. The operating method according to claim 11 , further comprising:

playing scrambled content by a device connected to the broadcast reception device based on the second data unit.

17. The operating method according to claim 11 , wherein the first data unit and the second data unit comprise objects for the information on the number of devices that play the scrambled content simultaneously with the broadcast reception device.

18. The operating method according to claim 11 , wherein the first data unit comprises usage rule information (URI) for a request for information on the number of devices that play scrambled content simultaneously with the broadcast reception device, and

the second data unit comprises an URI message for a reply to the request for the information on the number of devices that play scrambled content simultaneously with the broadcast reception device.

19. The operating method according to claim 11 , further comprising transmitting and receiving to and from the CAM a third data unit for a session open for transmitting/receiving the first data unit and the second data unit.