WO2016056795A1

WO2016056795A1 - Broadcasting reception apparatus, operation method for broadcasting reception apparatus, conditional access module, and operation method for conditional access module

Info

Publication number: WO2016056795A1
Application number: PCT/KR2015/010459
Authority: WO
Inventors: 윤준희; 서종열
Original assignee: 엘지전자 주식회사
Priority date: 2014-10-05
Filing date: 2015-10-02
Publication date: 2016-04-14

Abstract

The present invention provides a broadcasting reception apparatus. A broadcasting reception apparatus according to an embodiment of the present invention comprises: a slot for a connection to an external device including a conditional access module; a broadcasting reception unit for receiving a scrambled broadcast stream; and a control unit for requesting the external device connected to the slot for information for recognizing a device, receiving a response corresponding to the request, recognizing the connected external device on the basis of the received response, and descrambling a broadcast stream scrambled through the recognized external device.

Description

The broadcast receiving device, the operating method of the broadcast receiving device, the limited receiving module and the operating method of the limited receiving module

The present invention relates to a broadcast receiving device, a method of operating a broadcast receiving device, a limited receiving module and a method of operating a limited receiving module.

The broadcaster scrambles the content in order to provide the content only to viewers who paid the subscription fee, and the broadcast receiving device descrambles the scrambled content and provides the content to the viewer. Such a broadcast system is called a conditional access system (CAS). CAS differs in its specific operation depending on the CAS provider providing the CAS. Therefore, in order for a broadcast receiving device to provide a CAS of a specific company, it must implement all the specific functions and operation methods required by the corresponding company. In addition, the company must be certified to perform all the operations required by the company. Accordingly, it is difficult for a broadcast reception device to provide CASs according to various companies. In order to solve this problem, a conditional access module (CAM) and a common interface (CI) are used.

CAM is a module for descrambling broadcast content scrambled according to CAS of each individual company. CI is an interface to which a broadcast reception device and a CAM are connected. When the broadcast reception device includes a CI slot to which the CAM is connected, the user may connect a CAM capable of descrambling broadcast content to be watched in the CI slot. Through this, the broadcast reception device can provide a viewer by descrambled scrambled broadcast content by implementing only CI that can be linked with CAM without implementing all operations required by CAS of each individual company.

In this case, the CI slot may be a USB port. If the shape of the CI slot is different for each manufacturer of the CAM, the manufacturer of the broadcast receiving apparatus has to manufacture a broadcast receiving apparatus for the CI slot of all the CAM may be difficult in reality. Therefore, an embodiment of the present invention describes a method and apparatus for using a universally used USB port as a CI slot.

One embodiment of the present invention is to provide a broadcast receiving device, a limited reception module including a CI slot that can be used universally.

In particular, an embodiment of the present invention is to provide a broadcast receiving device for using USB as a device that can be used universally, a method of operating a broadcast receiving device, a method of operating a limited receiving module and a limited receiving module. .

The broadcast reception device according to an embodiment of the present invention provides a slot for connection with an external device including a conditional access module, a broadcast receiver for receiving a scrambled broadcast stream, and information for device recognition with an external device connected to the slot. And a controller for requesting, receiving a response corresponding to the request, recognizing the connected external device based on the received response, and descrambles the scrambled broadcast stream through the recognized external device.

In addition, the operating method of the broadcast reception device according to an embodiment of the present invention, receiving a scrambled broadcast stream, requesting information for device recognition to the external device connected to the slot response to the request Receiving, recognizing a connected external device based on the response, and descrambling a scrambled broadcast stream via the recognized external device.

An embodiment of the present invention may provide a broadcast receiving device and a limited reception module including a CI slot that can be used universally.

In particular, an embodiment of the present invention can provide a broadcast receiving device using a USB, a method of operating a broadcast receiving device, a method of operating a limited receiving module and a limited receiving module as a device that can be used universally.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of this application for further understanding of the invention, illustrate embodiments of the invention, together with a detailed description that illustrates the principles of the invention.

1 illustrates the structure of a broadcast reception device and a conditional access module according to an embodiment of the present invention.

2 illustrates a system flow between a broadcaster 50 (Head-End), a broadcast receiving device 100 (DTV Receiver), and a limited reception module 200 (CAM) according to an embodiment of the present invention. Represents a class code to be defined.

FIG. 4 shows a hierarchical structure of class code information shown in FIG. 3 as an example of a Miscellaneous class.

5A to 5D are examples for explaining the meaning according to the class code information. As described with reference to FIG. 4, the base class, subclass, and protocol may be combined to transfer information and function information of a device connected through USB.

6 shows a device descriptor.

7 shows a Configuration descriptor.

8 shows an interface descriptor.

9 shows an Interface Association Descriptor (IAD).

10 shows an Endpoint Descriptor.

11 shows a String Descriptor.

12 to 13 illustrate an embodiment of the present invention for a limited reception module of the USB type.

14 to 15 illustrate another embodiment of the present invention for a limited reception module of the USB type.

FIG. 16 illustrates an embodiment in which a descriptor including information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is included in a descriptor of a video base class.

17 illustrates an operation between a host and a conditional access module according to the embodiment of FIG. 16.

FIG. 18 illustrates another embodiment in which a descriptor including information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is included in a descriptor of a video base class.

19 illustrates an operation between a host and a limited reception module according to the embodiment of FIG. 18.

20 to 21 illustrate another embodiment of the present invention for a limited reception module of the USB type.

22 shows another embodiment of the present invention for a limited reception module of the USB type.

Figure 23 shows another embodiment of the present invention for a USB type limited reception module.

24 is a flowchart illustrating an operation of a broadcast reception device according to one embodiment of the present invention.

Preferred embodiments of the present invention will be described in detail, examples of which are illustrated in the accompanying drawings. DETAILED DESCRIPTION The following detailed description with reference to the accompanying drawings is intended to explain preferred embodiments of the invention rather than to show only embodiments that may be implemented in accordance with embodiments of the invention. The following detailed description includes details to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced without these details.

Most of the terms used in the present invention are selected from general ones widely used in the art, but some terms are arbitrarily selected by the applicant, and their meanings are described in detail in the following description as necessary. Therefore, the present invention should be understood based on the intended meaning of the term and not the simple name or meaning of the term.

The broadcast reception device 100 according to an embodiment of the present invention includes a broadcast reception unit 110, an IP (Internet Protocol) communication unit 130, a control unit 150, a common interface (CI) slot 170, and an output. It includes a portion (not shown).

The broadcast receiving unit 110 receives and demodulates a broadcast signal. In more detail, the broadcast receiving unit 110 may include a tuner 111 for receiving a broadcast signal. In addition, the broadcast receiving unit 110 may include a demodulator 113 for demodulating a broadcast signal.

The IP communication unit 130 receives and transmits IP data.

The controller 150 controls the operation of the broadcast reception device 100. In more detail, the controller 150 may include a multi-stream processor 151 that controls a plurality of stream inputs to the CAM. In addition, the controller 150 may include a multi-stream demux 153 for demuxing each stream from the plurality of descrambled streams. In addition, the controller 150 may include a Contents Control Decryption (CC Decrytion) 155 for decrypting the encrypted broadcast content for content protection. The content control decryption unit 155 may decrypt the encrypted broadcast content based on a unique key value assigned to the broadcast reception device 100. In addition, the controller 150 may include a communication interface unit 157 which transmits a control command of the broadcast reception device 100 to the CAM and receives a response to the control command from the CAM.

The CI slot 170 connects the broadcast receiving device 100 and the access restriction module Conditaion Access Module (CAM) 200. In more detail, the broadcast receiving device 100 may transmit a scrambled broadcast stream with a control command through a CI slot, and receive a broadcast stream obtained by encrypting a response to the control command and the descrambled broadcast stream. In one embodiment, the CI slot 170 may be any one of a standard PC Memory Card International Association (PCMCIA) and a universal serial bus (USB).

The access restriction module 200 according to an embodiment of the present invention includes a control unit 210. In detail, the controller 210 controls the operation of the CAM. In more detail, the controller 210 receives and descrambles the scrambled broadcast stream from the broadcast reception device 100. In more detail, the controller 210 may include a communication interface 211 that receives a control command from the broadcast reception device 100 and transmits a response to the control command. The communication interface 211 of the access restriction module 200 may interact with each other through a common interface (CI) between the communication interfaces 157 of the broadcast reception device 100. In this case, the CI may be a communication protocol between the broadcast reception device and the access restriction module. According to a specific embodiment of the present invention, the broadcast receiving device 100 and the access restriction module 200 may control the interaction of an application that is running through the communication interface.

In addition, the controller 210 may include a reception restriction system key calculator 219 for obtaining a control word (CW) based on the broadcast stream. In this case, CW represents a key required for descrambling scrambled broadcast content. In more detail, the reception restriction system key calculator 219 may extract an Entitlement Control Medssage (ECM) from the broadcast stream, transmit the entitlement control message (ECM) to the smart card 300, and obtain a CW from the smart card 300. In this case, the reception restriction system key calculator 219 may transmit a key for decrypting the encrypted stream to the reception restriction system descriptor cipher 213.

In addition, the controller 210 may include a reception restriction system cipher 213 that descrambles the scrambled broadcast content using the acquired CW. In this case, the reception restriction system descriptor cipher 213 may decrypt the encrypted stream to generate a clear stream. The clear stream may refer to a stream whose encryption state is released. In addition, the reception restriction system descriptor cipher 213 may communicate with the reception restriction system key calculator 219 for decoding the stream.

In addition, the controller 210 may include a content control encryption unit 215 that encrypts the descrambled broadcast content to prevent leakage of the descrambled broadcast content. In a specific embodiment, the content control encryption unit 215 may encrypt the descrambled broadcast content (clear stream) by obtaining a key value for encryption from the reception restriction system decryption cipher 213. In this case, the key value for encryption may be a unique key value assigned to the corresponding CAM.

In addition, the control unit 210 may include a content control system cryptographic tool (217) that provides an encryption tool (tool) to the content control encryption unit (215). In detail, the content control system encryption tool unit 217 may provide the content control encryption unit 215 with an encryption tool necessary to encrypt the clear stream again.

In addition, the controller 210 may provide information for the broadcast reception device 100 to recognize an external device including the restriction reception module 200. In more detail, the controller 210 may have a descriptor for recognizing an external device. In this case, a descriptor for recognizing an external device may be provided according to a request of the broadcast reception device 100. Details of the descriptor are described below.

The CAM 200 may extract usage rule information (URI) from the broadcast stream. The URI is that at least one of the content provider and the content distributor specifies the usage rule of each content. In more detail, the URI may represent at least one of rules for output and duplication of content. For example, the URI may indicate whether to allow duplication of content. The URI may indicate a usage rule of a specific broadcast service. In addition, the URI may indicate a usage rule of a specific event included in the broadcast service. In addition, the URI may indicate whether to allow the analog output of the content. At this time, the analog output is to output analog audio or analog video. In addition, the digital output is to output digital audio or digital video. In more detail, the terminal for outputting the analog output may include at least one of a scart terminal, a composite terminal, and a component terminal. The terminal for outputting the digital output may include at least one of a high definition multimedia interface (HDMI) terminal and a Sony Philips Digital Interface (SPDIF) terminal.

2 shows a system flow between a broadcaster 50 (Head-End), a broadcast receiving device 100 (DTV Receiver), and a limited reception module 200 (CAM) according to an embodiment of the present invention. The broadcast stream is transmitted to the broadcast receiving device 100. In this case, the broadcaster 50 may encrypt and transmit the content received from the content provider. In this case, the broadcaster 50 may transmit an encrypted broadcast stream through a broadcast signal (RF Flow).

The broadcast reception device 100 may receive an encrypted broadcast stream from the broadcaster 50 through a broadcast signal (RF Flow). In addition, the broadcast reception device 100 may receive an encrypted IP stream (IP Flow) from the broadcaster 50 or the content provider through the IP network.

The restriction reception module 200 may receive an encrypted stream from the broadcast reception device 100 and decrypt the encrypted stream into a clear stream.

In one embodiment of the present invention, the limited reception module 200 may be a card type inserted into a slot. In another embodiment, the limited reception module 200 may be a universal serial bus (USB) type. When the conditional access module 200 is a USB type, when the conditional access module 200 connects to the broadcast reception device 100, an enumeration process may be performed. The enumeration process is described in detail below.

The enumeration process refers to an information exchange process in which an application obtains information about a device and determines an appropriate device driver to communicate with the device. The enumeration process may include a configuration selection that specifies device assignment, reading descriptors from the device, selecting the appropriate device driver, and specifying the device's power requirements and interfaces. The device must complete the enumeration process before it is ready to send data.

A specific enumeration process is as follows.

1. The system takes a new device

: The user powers on the system with the device attached to the USB port or with the device attached.

2. The Hub detects the device

The hub monitors the voltage of each port signal line (D + and D-). The hub will continue to supply power after detecting the device connection, but will not send USB traffic to the device yet.

3. Host getting new device information

Each hub reports an event that has occurred using an interrupt endpoint. The interrupt endpoint may be data for the host to query the device for the presence of data to transmit. The host sends a request to the hub to learn more about the event that occurred. In this case, the request transmitted by the host may be referred to as Get_Port_Status. The host can detect whether a new device is attached to the host by responding to the request.

4. The hub detects the speed of the device

The hub can detect the speed of the device by checking both signal line voltages before resetting the device. In this case, the speed of the device may be one of full speed and low speed.

5. Steps by the Hub to Reset the Device

If the host recognizes that it is the creator of a new device, the host requests a port reset to the hub. In this case, the request transmitted by the host for port reset may be Set_Port_Feature.

6. The host checks whether the device at full speed also supports high speed

All high speed devices must be able to respond to enumeration requests at full speed.

7. Hub establishes signal path between device and bus

When the hub finishes resetting the port, the device is in its default state. At this time, the USB register of the device is in an initial state. The device then communicates with the host using the default address. For example, the base address may be 00h.

8. The host sends a request to find out the maximum packet size of the default pipe.

The host may send a Get Descriptor request through the base address to determine the maximum packet size of the base pipe. In this case, the maximum packet size of the basic pipe may be included in the device descriptor. For example, the maximum packet size of the base pipe may be included in the eighth byte of the device descriptor.

9. Steps for Hosts to Assign Addresses

When the reset is complete, the host sends a request for a unique address assignment to the device. In this case, the request for allocation of a unique address transmitted by the host may be Set_Address. The assigned address is valid until you remove the device, reset the port, or reboot the system.

10. The host reads information about the device's capabilities.

The host sends a request to read the device descriptor to the new address assigned. In this case, the request transmitted by the host may be Get_decriptor. The device descriptor obtained by the host may include any one of a maximum packet size, the number of configurations supported by the device, and other basic information about the device. The host can request one or more configuration descriptors specified in the device descriptor to get detailed information about the device.

11. The host allocates device drivers and gets memory

After the host gets information about the device from the descriptor, it finds the best device driver to manage the device and communication tasks.

12. Device Driver Selects Configuration

After getting the device information from the descriptor, the device driver sends the desired configuration number through 'Set_Configuration' request. When the device receives a request from the device driver, it activates the requested configuration. The device is in the "Configured" state and the interface is activated. As a result, the USB device is ready for use.

In an embodiment of the present invention, the host may mean the broadcast reception device 100. In addition, the device may mean the limited reception module 200.

3 shows a class code defined in the USB standard.

As shown in Figure 3, the USB standard defines class code information. The class code is used to functionally identify the device connecting via USB. The class code information may include a base class, a subclass, and a protocol. The class code information may be located in the device. In a specific embodiment, the class code information may be located in a device descriptor. In addition, the class code information may be located in an interface descriptor.

As shown in FIG. 4, the base class of class code information may represent Michelinius. In a specific embodiment, the base class value may be EFh. The base class can contain multiple subclasses. For example, the subclasses included in Michelinius may be 01h, 02h, 03h, 04h, and 05h. In addition, each subclass may include one or more protocols.

5 (a) to 5 (d) are examples for explaining the meaning according to the class code information. As described with reference to FIG. 4, the base class, subclass, and protocol may be combined to transfer information and function information of a device connected through USB.

6 shows a device descriptor.

As described above, the device descriptor means a data structure through which the host can obtain detailed information about the device. Each descriptor has information about the whole device or each configuration. All USB devices must store information in descriptors and respond to standard USB descriptor requests. The device descriptor may include at least one of the fields shown in FIG. 6.

7 shows a Configuration descriptor.

Each device contains one or more Configurations that specify device features and functions. The configuration descriptor contains information about whether the device power is used and how many interfaces are supported. Each configuration descriptor includes an appended descriptor. The subdescriptor may include one or more interface descriptors. In addition, the accessory decriptor may optionally include an endpoint descriptor. The configuration descriptor may include at least one of the fields shown in FIG. 7.

8 shows an interface descriptor. Interface descriptors provide information about the functionality a device implements. The interface descriptor may include class, subclass, protocol information, and information about the number of endpoints used by the interface. Each interface may include its own interface descriptor and subdescriptors. In addition, the interface may include one or more alternative interface settings. The interface descriptor may include at least one of the fields shown in FIG. 8.

9 shows an Interface Association Descriptor (IAD).

The interface related descriptor may include information for identifying a plurality of interfaces associated with the function. In this case, the interface may refer to a function implemented by the device. The interface related descriptor may include class, subclass and protocol information, and information on the number of interfaces related to a function. The interface related descriptor may include at least one of the fields shown in FIG. 9.

10 shows an Endpoint Descriptor. Each endpoint specified in the interface descriptor has an endpoint descriptor. Endpoint 0 does not have a descriptor because every device supports it and the device descriptor contains the maximum packet size. The host can request a configuration descriptor and get an endpoint descriptor in response to the request. The endpoint descriptor may include at least one of the fields shown in FIG. 10.

11 shows a String Descriptor. The string descriptor contains descriptive text. Descriptors other than string descriptors may include string indices. In this case, the string index included in another descriptor may be a string representing a manufacturer, a product, a serial number, a configuration, and an interface. The string descriptor may not be an essential descriptor. The string descriptor may include at least one of the fields shown in FIG. 11.

Hereinafter, a USB device descriptor for the conditional access module 200 according to an embodiment of the present invention will be described. In detail, the conditional access module 200 may transmit / receive data with the broadcast reception device 100 through USB. In addition, the limited reception module 200 and the broadcast reception device 100 need to define a descriptor in order to transmit and receive data through USB.

FIG. 12 illustrates an embodiment in which information for indicating that a device connected to a USB port of a host is a device related to the conditional access module 200 is defined in a base class of a descriptor. As shown in FIG. 12, the descriptor for the USB standard may include a base class. In addition, the base class according to an embodiment of the present invention may include a separate base class for the limited reception module 200.

13 also shows a subclass and protocol of the base class for the conditional access module 200. As shown in FIG. 13, the base class for the conditional access module 200 may include a subclass of 00h. The 00h subclass may include one or more protocols. For example, a subclass may include a protocol indicating that a device connected through a USB port is a device that conforms to CI Plus 2.0 version. In this case, the base class for the conditional access module 200 may be a value excluding a base class that is previously defined.

12 to 13, a new base class for only the limited reception module 200 may be defined without considering other base classes. Thus, subclasses of the base class can be defined relatively freely.

14 to 15 illustrate another embodiment of the present invention for a limited reception module of the USB type. In more detail, FIGS. 14 to 15 illustrate an embodiment in which information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is defined as a sub-list of a video base class.

As illustrated in FIG. 14, information indicating that a device connected to a USB port is a device related to the conditional access module 200 may be defined as a subclass of the video base class. In this case, the newly defined subclass may be a value except for the previously defined subclass value. For example, a newly defined subclass can have a value of 0x04. Also, the value 0x04 can be modified or changed later.

In addition, as illustrated in FIG. 15, information indicating that a device connected to the USB port is a device related to the conditional access module 200 may be defined as a protocol of a subclass. In this case, the newly defined protocol may be a value excluding a previously defined protocol value. For example, a newly defined protocol may have a value of 0x02. Also, the value 0x02 can be modified or changed later. In this case, the newly defined protocol may be a subprotocol of the new subclass shown in FIG. 14.

Hereinafter, the embodiment of FIGS. 14 to 15 described above with reference to FIGS. 16 to 19 will be described in more detail.

FIG. 16 illustrates an embodiment in which a descriptor including information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is included in a descriptor of a video base class. As illustrated in FIG. 16, the limited reception module unit may be defined as one subtype of the interface descriptor according to the video base class. In this case, the unit may mean a configuration related to the video base class. For example, the unit defined in the descriptor of the video base class may be a decoding unit. According to a specific embodiment, the value indicating the limited reception module unit may be 0x08.

In this case, the interface descriptor according to the video base class may include information for identifying the limited reception module unit. In this case, the information for identifying the conditional access module unit may be bUnitID.

In addition, the descriptor related to the limited reception module 200 may include information for distinguishing the mounted limited reception module when a plurality of limited reception modules are mounted in one host. In this case, the information for identifying the limited reception module may be BCIPlusID.

In addition, the descriptor related to the conditional access module 200 may include information for controlling the conditional access module. In this case, the information for controlling the conditional access module may be bmControls. On the other hand, the descriptor of the limited reception module unit shown in FIG. 16 may include additional information in response thereto when there is a function to be added later.

First, the host requests Get Descriptor to get detailed information about the device. In response to a request from the host, the device transmits a descriptor including detailed information to the host.

The host receiving the descriptor obtains the USB spec version, the Class / subclass / protocol code, maximum packet size, vendor ID, serial number, and configuration number information through the device descriptor. For example, the class / subclass / protocol code may be video class (0x0E) / subclass: SC_VIDEO_INTERFACE_COLLECTION (0x03) / protocol: PC_PROTOCOL_15. At this time, the value of the class / subclass / protocol code defined in the USB IF may have a different value.

The broadcast reception device 100 may know the number of configurations supported by the device through the device descriptor.

The broadcast reception device 100 obtains information on the number of interfaces used and power usage of the device through a configuration descriptor.

The broadcast reception device 100 obtains information on a specific interface defined in the configuration descriptor through the interface descriptor. For example, the broadcast reception device 100 may obtain a videoControl interface descriptor and a videostreaming interface descriptor through an IAD interface for a conditional access module.

In addition, the broadcast reception device 100 may determine that the device mounted in the broadcast reception device 100 (Host) is a device for a limited reception module of the USB type through the limited reception module unit descriptor included in the videoControl interface descriptor. . Thereafter, the broadcast reception device 100 receives streaming related information from a device for a limited reception module of a USB type through a videostreaming interface descriptor.

FIG. 18 illustrates another embodiment in which a descriptor including information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is included in a descriptor of a video base class. As illustrated in FIG. 18, an interface descriptor according to a video base class may define a conditional access module terminal as one subtype. In this case, the subtype indicating the limited reception module terminal may be referred to as VC_USB_TERMINAL. The value representing the limited reception module terminal may be 0x08.

In addition, the interface descriptor can define a new USB terminal type. In this case, the new USB terminal type may be TT CIPLUS.

In this case, the interface descriptor may include information for identifying the limited reception module terminal. In this case, the information for identifying the conditional access module terminal may be bTerminalID.

In addition, the descriptor related to the conditional access module 200 may include information for controlling the conditional access module. In this case, the information for controlling the conditional access module may be bmControls. Meanwhile, the descriptor of the conditional access module terminal illustrated in FIG. 18 may include additional information in response to a function added later.

In addition, the broadcast reception device 100 may determine that the device mounted in the broadcast reception device 100 (Host) is a device for the limited reception module of the USB type through the limited reception module terminal descriptor included in the videoControl interface descriptor. . Thereafter, the broadcast reception device 100 receives streaming related information from a device for a limited reception module of a USB type through a videostreaming interface descriptor.

The above-described embodiments of FIGS. 16 to 19 may be similarly applied to a case where a class for the restricted reception module is defined in a lower class of a base class other than the video base class. For example, the embodiment of FIGS. 16 to 19 may be equally applicable to a case where a class for a conditional access module is defined in a subclass of a Michelin base class. In other words, the conditional access module 200 and the broadcast reception device 100 may recognize that a device connected to a subclass of the Michelin base class through a conditional access module unit or a conditional access module terminal is a device for a conditional access module. Can be. A specific descriptor parsing step may be in accordance with FIG. 17 or 19.

On the other hand, when defining a class for the restricted reception module to a subclass of a predefined base class, the implementation of the descriptor may be relatively simple. In detail, in the case of the predefined base class, most subclasses and protocols for device recognition are predefined. Therefore, the broadcast reception device 100 may additionally acquire only information for the limited reception module and recognize the connected device while using the predefined subclass and protocol.

20 to 21 illustrate another embodiment of the present invention for a limited reception module of the USB type. In more detail, FIGS. 20 through 21 illustrate an embodiment in which information for indicating that a device connected to a USB port is a device related to the conditional access module 200 is defined as a sub-list of a content security base class. As illustrated in FIG. 20, information indicating that a device connected to a USB port is a device related to a conditional access module may be defined as a subclass of the content security base class. In this case, the newly defined subclass may be a value except for the previously defined subclass value. For example, a newly defined subclass could have a value of 01h.

As illustrated in FIG. 21, a descriptor for indicating that a device connected to a USB port is a device related to a conditional access module may be defined in an interface descriptor of a content security base class. In this case, the newly defined descriptor may be CS_CI_PLUS. In addition, the value of the newly defined descriptor may be 0x24. The name and value of the newly defined descriptor may be changed later. In addition, the descriptor shown in FIG. 21 may be added afterwards.

22 shows another embodiment of the present invention for a limited reception module of the USB type. In detail, FIG. 22 illustrates an embodiment in which information indicating that a device connected to a USB port is a device related to the conditional access module 200 is defined as a sub-list of the Miscellaneous Base Class. As illustrated in FIG. 22, information indicating that a device connected to a USB port is a device related to a conditional access module may be defined as a subclass of the Michelinian base class. In this case, the newly defined subclass may be a value except for the previously defined subclass value. For example, a newly defined subclass could have a value of 06h.

Figure 23 shows another embodiment of the present invention for a USB type limited reception module. In detail, FIG. 23 illustrates an embodiment in which information indicating that a device connected to a USB port is a device related to the conditional access module 200 is defined as a sub-list of a vendor specific base class. As illustrated in FIG. 23, information indicating that a device connected to a USB port is a device related to a conditional access module may be defined as a subclass of a vendor specific base class. In this case, the newly defined subclass may be a value except for the previously defined subclass value. For example, a newly defined subclass could have a value of 00h.

The broadcast reception device 100 receives a scrambled broadcast stream in operation S101. In one embodiment, the scrambled broadcast stream is received through the tuner of the broadcast receiver 110. In another embodiment, the scrambled IP stream is received through the IP communication unit 130. In this case, the stream may be a continuous flow of a packet including content and content signaling data.

The broadcast reception device 100 transmits descriptor request information to an external device connected through the CI slot 170 (S103). In more detail, the controller 150 of the broadcast reception device 100 may transmit a signal for requesting a descriptor for recognizing an external device. In this case, the connected external device may be a device for the conditional access module.

The broadcast reception device 100 receives a response to a descriptor request from an external device (S105). In more detail, the controller 150 of the broadcast reception device 100 receives a response to a descriptor request from an external device. In this case, the descriptor received by the controller 150 may be a device descriptor. The device descriptor may include a lower descriptor. For example, the device descriptor may be a configuration descriptor. In addition, the configuration descriptor may include an accessory descriptor. Attachment descriptors can be referred to as interface descriptors. The attached descriptor may also be referred to as an endpoint descriptor.

In this case, the interface descriptor may include class information for recognizing the external device. The class information may include a base class, a subclass that is a subclass of the base class, and a protocol that is a subclass of the subclass. In a specific embodiment, the interface descriptor may include a videocontrol interface descriptor and a videostreaming interface descriptor. The video control interface descriptor may include class information. The controller 150 may recognize that the connected external device is a device for the limited reception module of the USB type using the class information.

According to an embodiment of the present invention, the information indicating that the external device connected to the broadcast reception device 100 is a device for the limited reception module may be defined as one base class of the base class level. In this case, the controller 150 may recognize that the connected external device is for the limited reception module according to the base class information of the descriptor.

According to another embodiment, the information indicating that the external device connected to the broadcast reception device 100 is a device for the limited reception module may be defined as one subclass of a subclass level. In this case, the newly defined subclass may be a subclass of the existing base class. In this case, the existing base class may be a base class previously defined in the USB standard. In this case, the controller 150 may recognize that the connected external device is for the limited reception module according to a subclass which is a subclass of the base class of the descriptor.

The controller 150 recognizes the connected external device based on the received response (S107). In detail, the controller 150 may recognize the connected external device based on the descriptor received in response to the request. According to an embodiment of the present disclosure, the controller 150 may recognize that the connected external device is a device for the limited reception module of the USB type. Meanwhile, the recognition of the external device by the controller 150 may mean that the external device is ready for use. In other words, it may mean that the device is ready to transmit and receive data with the connected external device.

After recognizing that the connected external device is a device related to the conditional access module, the controller 150 descrambles the content by transmitting / receiving the scrambled content with the conditional access module 200 (S109). In a specific embodiment, the controller 150 may transmit the scrambled content to the USB-type limited reception module 200. The USB type limited reception module 200 may descramble the scrambled content using a key value and transmit the descrambled content to the controller 150 again. At this time, the limited reception module 200 may transmit information for controlling the descrambled content together with the descrambled content. For example, the information for controlling the descrambled content may be the number of additional external display devices capable of playing the descrambled content. For another example, the information for controlling the descrambled content may be a number of times that the descrambled content can be copied.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

Although the above description has been made based on the embodiments, these are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains may not have been exemplified above without departing from the essential characteristics of the present embodiments. It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Claims

A slot for connection with an external device including a conditional access module;

A broadcast receiver configured to receive a scrambled broadcast stream; And

Requesting information for device recognition from an external device connected to the slot, receiving a response corresponding to the request, recognizing the connected external device based on the received response, and scrambled through the recognized external device It includes a control unit for descrambling

Broadcast receiving device.
In claim 1,

The response received from the external device includes a first descriptor,

The first descriptor includes lower descriptors

Broadcast receiving device.
In claim 2,

The first descriptor includes a second descriptor including class information for recognizing an external device.

The class information includes first class information, second class information that is a subclass of first class information, and third class information that is a subclass information of second class information.

Broadcast receiving device.
In claim 3,

The controller recognizes an external device connected to the slot according to first class information.

Broadcast receiving device.
In claim 3,

The controller recognizes an external device connected to the slot according to second class information.

Broadcast receiving device.
In claim 1,

The slot is a slot for a universal serial bus (USB)

Broadcast receiving device.
In claim 1,

The response received from the external device is

Version information of an external device connected through the slot, first identifier information for identifying a limited reception module included in the external device, and identifying each external device when a plurality of external devices are connected to the broadcast receiving device At least one of the second identifier information for

Broadcast receiving device.
In claim 7,

The response received from the external device further includes information for controlling the limited reception module included in the external device.

Broadcast receiving device.
A method of operating a broadcast receiving device including a slot for accessing an external device including a limited reception module

Receiving a scrambled broadcast stream;

Requesting information for device recognition from an external device connected to the slot;

Receiving a response corresponding to the request;

Recognizing a connected external device based on the response; And

Descrambling the scrambled broadcast stream via the recognized external device;

Operation method of a broadcast receiving device.
The method of claim 9,

The response received from the external device includes a first descriptor,

The first descriptor includes lower descriptors

Operation method of a broadcast receiving device.
In claim 10,

The first descriptor includes a second descriptor including class information for recognizing an external device.

The class information includes first class information, second class information that is a subclass of first class information, and third class information that is a subclass information of second class information.

Operation method of a broadcast receiving device.
In claim 11,

Recognizing the external device,

Recognizing an external device connected to the slot according to the first class information.

Operation method of a broadcast receiving device.
In claim 11,

Recognizing the external device

Recognizing an external device connected to the slot according to the second class information.

Operation method of a broadcast receiving device.
In claim 9,

The response received from the external device is

Version information of an external device connected through the slot, first identifier information for identifying a limited reception module included in the external device, and identifying each external device when a plurality of external devices are connected to the broadcast receiving device At least one of the second identifier information for

Operation method of a broadcast receiving device.
The method of claim 14,

The response received from the external device further includes information for controlling the limited reception module included in the external device.

Operation method of a broadcast receiving device.
A device comprising a conditional access module for descrambling a scrambled broadcast stream, the device comprising:

And a controller for interacting with a broadcast receiving device, descrambled scrambled broadcast stream, encrypting a descrambled broadcast stream, and providing information for device recognition to the broadcast receiving device.

A device comprising a conditional access module.
The method of claim 16,

The information for device recognition includes a descriptor,

The descriptor includes information indicating that the device is a limited reception module of a USB type.

A device comprising a restricted reception module.