KR20100098273A - Method and apparatus for copy protection of wihd device - Google Patents

Abstract

PURPOSE: A method and an apparatus for copy protection of a WiHD(WirelessHD(High Definition)) device are provided to prevent the copy of HD contents in a WiHD network by using an MAC packet. CONSTITUTION: A copy preventing technique type determining unit(1010) determines the type of the copy preventing technique of the contents transmitted from a WiHD wireless network. An input counter calculator(1020) accumulates the number of MAC sub packets as input counter information, wherein the MAC sub packets constitute the MAC(Media Access Control) payload. A packetizer(1030) packetizes the calculated input counter information and the determined copy preventing technique by using the MAC packet. A transmission unit(1040) transmits the MAC packets to a WiHD receiving device.

Description

Method and apparatus for copy protection of VHDD device {Method and apparatus for copy protection of WiHD Device}

The present invention relates to copy protection, and more particularly, to a method and apparatus for copy protection of high definition (HD) content in a WirelessHD (WiHD) wireless network.

Digital Rights Management (DRM) is a technology that securely manages and protects digital contents throughout the entire distribution process from generation to use of digital contents, and controls and controls the use of digital contents according to the authorized information. Technical methods for DRM can be classified into passive protection technology and active protection technology. Passive protection technology does not restrict the use of digital content by unauthorized users, but expects the effect of restraining illegal behavior by inducing legal awareness. Active protection technology is a technology that actively blocks access to digital content of users without permission by using encryption technology.

 One of DRM's aggressive protection technologies, Content Protection, encrypts digital content using an encryption key that depends on the storage medium or device, so that the copied content can be used even if the content is copied to another medium or device. It is a technique to avoid. Such copy protection technologies include Digital Transmission Content Protection (DTCP), High-bandwidth Digital Content Protection (HDCP), and Content Protection for Prerecorded Media (CPPM).

DTCP is a copy protection technology for IEEE-1394, a digital input / output standard such as Digital Video Home System (DVHS) and Personal Video Recorder (PVR), and has been proposed by 5C (Hitachi, Intel, Matsushita, Sony, Toshiba). HDCP is a copy protection technology for Digital Visual Interface (DVI) and High-Definition Multimedia Interface (HDMI), which is used for digital output for display, and is proposed by Intel and is intended for the Digital Content Protection LLC (DCP) organization. License management by

CPPM has been proposed by 4C (IBM, Intel, Matsushita, Toshiba) as a copy protection technology for content distributed using removable storage media (DVD-R, SD etc.).

Meanwhile, WirelessHD (WiHD) is a wireless digital network interface standard for wireless high definition (HD) digital signal transmission in the 60 GHz frequency band, and has been proposed by the WiHD consortium. WiHD uses mmWave technology in the 60 GHz band to support physical layer data rates of several gigabits per second (Gbps) and can be used to wirelessly transmit uncompressed HDTV (High Definition Television) signals.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for preventing duplication of high definition (HD) content in a WirelessHD (WiHD) wireless network, and to provide a computer readable recording medium having recorded thereon a program for executing the method. It is.

According to an embodiment of the present invention, a copy protection method of a WiHD transmission device includes determining a type of a copy protection technology of content transmitted in a WiHD (WirelessHD) wireless network; Accumulating and counting the number of MAC subpackets constituting a media access control (MAC) payload including the content as input counter information; Packetizing the determined type of copy protection technique and the calculated input counter information, respectively, using a MAC packet; And sending the MAC packet to a WiHD receiving device.

According to an embodiment of the present invention, the type of the copy protection technology of the content includes at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP).

According to an embodiment of the present invention, the step of packetizing packetizes the determined type of copy protection technique by using the CP header of the MAC packet, and calculates the calculated using the CP subpacket header of the MAC subpacket. Packetize the input counter information.

According to an embodiment of the present invention, the method may further include calculating stream counter information from a stream identifier for identifying the stream for content transmission.

According to an embodiment of the present invention, the method may further include packetizing the stream counter information by using the MAC header of the MAC packet or the MAC subpacket header of the MAC subpacket.

According to an embodiment of the present invention, the MAC payload includes the content encrypted using the input counter information and the stream counter information.

According to an embodiment of the present invention, using the MAC header of the MAC packet or the MAC subpacket header of the MAC subpacket, packetizing stream counter information calculated from a stream identifier for identifying the stream for the content transmission. It further includes.

According to an embodiment of the present invention, the MAC payload includes the content encrypted using the input counter information and the stream counter information.

According to an embodiment of the present invention, packetizing the type of the copy protection technology of the content by using a MAC Capability Information Element (IE) transmitted when the WiHD transmitting device joins a WiHD wireless network. It includes more.

According to an embodiment of the present invention, the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network.

In addition, according to an embodiment of the present invention, the copy protection method of a WiHD receiving device includes a media access control (MAC) payload including a type of copy protection technology and encrypted content of a content transmitted in a WiHD (WirelessHD) wireless network. Receiving a MAC packet including input counter information for calculating the number of MAC sub-packets from the WiHD transmitting device, obtains the stream counter information calculated from the stream identifier for identifying the stream for the content transmission, the input counter Decrypting the encrypted content using the information and the stream counter information.

According to an embodiment of the present invention, the type of the copy protection technology of the content includes at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP).

According to an embodiment of the present invention, the obtaining of the stream counter information may include: depacketizing the MAC packet or identifying a stream for content transmission when the received MAC packet includes the stream counter information. Get stream counter information directly from the identifier.

According to an embodiment of the present invention, the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network.

In addition, according to an embodiment of the present invention includes a computer-readable recording medium on which a program for performing the method is recorded.

In addition, according to an embodiment of the present invention, a WiHD transmission device includes: a copy protection technology type determination unit for determining a type of copy protection technology of content transmitted in a WiHD (WirelessHD) wireless network; An input counter calculator configured to accumulate, as input counter information, the number of MAC subpackets constituting a media access control (MAC) payload including the content; A packetizer configured to packetize the determined copy protection technique and the calculated input counter information by using a MAC packet; And a transmitter for transmitting the MAC packet to a WiHD receiving device.

In addition, according to an embodiment of the present invention, the WiHD receiving device may include a MAC sub-constituting media access control (MAC) payload including a type of copy protection technology and encrypted content of a content transmitted in a WiHD (WirelessHD) wireless network. A receiving unit for receiving a MAC packet including input counter information for calculating the number of packets from the WiHD transmitting device; A stream counter obtainer for obtaining stream counter information calculated from a stream identifier for identifying the stream for transmitting the content; And a decryption unit that decrypts the encrypted content using the input counter information and the stream counter information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements, and the size of each element in the drawings may be exaggerated for clarity.

1 is a schematic diagram illustrating a copy protection method of a WiHD device according to an embodiment of the present invention.

WiHD is a wireless digital network interface standard for transmitting uncompressed HDTV (High Definition Television) signals wirelessly. The WiHD transmitting device 110 is a device for transmitting an uncompressed HDTV signal to the WiHD receiving device 150 and includes a set top box and a media server. The WiHD receiving device 150 is a device that receives an uncompressed HDTV signal from the WiHD transmitting device 110 and includes a DVD player, an HDTV, a home theater, a printer, an overhead projector, and the like.

HDCP (113, 153) is a proposed copy protection technology for HDMI and the like used for digital output for display. 1 illustrates a copy protection method of a WiHD transceiver device so that it can operate HDCP over WiHD used to transmit uncompressed HD video data.

The WiHD transmission device 110 determines the type of copy protection technology (eg, DTCP, HDCP) of the content transmitted in the WiHD wireless network. In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied.

When the WiHD transmission device 110 determines to use HDCP as a type of copy protection technology of the content, the HDCP module 113 of the WiHD transmission device 110 may determine the AV data (raw data) generated by the AV processor 111 and The AV data is encrypted using a predetermined encryption engine as a predetermined encryption key stream as an input. As a predetermined encryption engine, the HDCP standard exemplifies the use of the Advanced Encryption Standard (AES), but it is apparent to those skilled in the art that other encryption engines may be applied.

The predetermined encryption key stream input to the encryption engine is generated using session key information, stream counter information, input counter information, and the like.

The session key information is generated in the AV control layers 115 and 155 of the WiHD transmitting device 110 and the WiHD receiving device 150 after mutually authenticating the transmitting and receiving device using a predetermined authentication protocol. Although a predetermined authentication protocol is illustrated as AKE (Authentication and Key Exchange) in this embodiment, it is apparent to those skilled in the art that other authentication protocols may be applied.

The stream counter information means information for identifying multimedia streams transmitted between the transmitting and receiving devices. When AV data is configured as a MAC payload, the AV data is segmented into a plurality of MAC subpackets. The input counter information refers to information obtained by accumulating the number of MAC subpackets.

The HDCP module 113 of the WiHD transmission device 110 forwards the type of copy protection technology, stream counter information, input counter information, encrypted AV data, etc., used to encrypt AV data to the MAC layer 117. The MAC layer 117 of the WiHD transmitting device 110 packetizes the type of copy protection technology, stream counter information and input counter information using the header of the MAC packet or the header of the MAC subpacket. The WiHD transmitting device 110 transmits the MAC packet including the encrypted AV data 140 to the WiHD receiving device.

The MAC layer 157 of the WiHD receiving device 150 receives a MAC packet from the WiHD transmitting device 110 including encrypted AV data, type of copy protection technology, stream counter information and input counter information.

When the type of copy protection technology is HDCP, the HDCP module 153 of the WiHD receiving device 150 decrypts the encrypted AV data 140 using session key information, stream counter information, input counter information, and the like. The AV processor 151 of the WiHD receiving device 150 consumes the decoded AV data.

According to an embodiment of the present invention, the WiHD transmission and reception device 110, 150 encrypts HD data using a copy protection technology on a WiHD wireless network that transmits uncompressed HD data wirelessly, even if the content is transferred to another medium or device. HD data can be protected so that the copied content cannot be used even if it is copied.

2 illustrates a High Rate PHY (MAP) MAC packet structure according to an embodiment of the present invention.

WiHD devices 110 and 150 utilize two channels, a symmetrical Low Rate PHY (LRP) data / control channel and an asymmetric High Rate PHY (HRP) data channel.

The LRP channel operates in two modes, omni-directional or directional. Omni-directional mode is used for control data transmission, such as beacons and acknowledgment (ACK), and supports data rates of about 2.5 to 10 Mbps (Megabits per second). Directional or beamformed modes are used for audio transmission and support data rates of about 20 to 40 Mbps.

HRP data channels are directional (beamformed) channels, used to transmit uncompressed video, and support several Gbps (eg 1 to 4 Gbps) data rates.

The HRP MAC packet of FIG. 2 is used by the WiHD transmitting device 110 to transmit encrypted uncompressed video over an HRP channel.

The "Encryption Type" field 225 of the HRP MAC header 210 refers to a type of copy protection technology of content transmitted in a WiHD wireless network. This embodiment defines "0", "1", "2", "3" as the value of the "Encryption Type" field 225, and each value is "No encryption", "DTCP encryption", "HDCP2". .0 encryption "," Reserved ". In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied. In this embodiment, the "Encryption Type" field 225 is described using the "Reserved" field 223 of the "CP header" field 220 of the HRP MAC header 210.

The "StreamCtr" field 241 of the HRP MAC header is stream counter information, which is information for identifying multimedia streams transmitted between transmitting and receiving devices. In this embodiment the "StreamCtr" field 241 is described using the "Reserved" field 240 of the HRP MAC header 210.

The WiHD transmission device 110 segments the AV data 140 into a MAC payload, and segments the plurality of MAC subpackets 270. The "InputCtr" field 273 of the HRP MAC subpacket 270 refers to input counter information calculated by accumulating the number of MAC subpackets. The "InputCtr" field 273 is described using the CP sub packet header 271 of the HRP MAC sub packet 270.

The HDCP module 153 of the WiHD receiver device 150 may display the "StreamCtr" field 241 and the "InputCtr" field 273 when the "Encryption Type" field 225 is "HDCP2.0 encryption". And decrypts the encrypted AV data 140.

Since fields of other HRP MAC packets follow the WiHD standard, a detailed description thereof is omitted here.

3 shows a structure of a high rate PHY (HRP) MAC packet according to a second embodiment of the present invention.

The "Encryption Type" field 325 of the HRP MAC header 310 refers to a type of copy protection technology of content transmitted in a WiHD wireless network. This embodiment defines "0", "1", "2", and "3" as the value of the "Encryption Type" field 325, and each value is "No encryption", "DTCP encryption", "HDCP2". .0 encryption "," Reserved ". In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied. In the present embodiment, the "Encryption Type" field 325 is described using the "Reserved" field 323 of the "CP header" field 320 of the HRP MAC header 310.

The WiHD transmission device 110 segments the AV data 140 into a plurality of MAC subpackets 370 when the AV data 140 is configured as a MAC payload.

The "StreamCtr" field 373 of the HRP MAC subpacket 370 is stream counter information, which is information for identifying multimedia streams transmitted between transmitting and receiving devices. In the present embodiment, the "StreamCtr" field 373 is described using the CP sub packet header 371 of the HRP MAC sub packet 370. The "InputCtr" field 375 of the HRP MAC subpacket 370 refers to input counter information calculated by accumulating the number of MAC subpackets. The "InputCtr" field 375 is described using the CP sub packet header 371 of the HRP MAC sub packet 370.

The HDCP module 153 of the WiHD receiver device 150 uses the "StreamCtr" field 373 and the "InputCtr" field 375 when the "Encryption Type" field 325 is "HDCP2.0 encryption". And decrypts the encrypted AV data 140.

Since fields of other HRP MAC packets follow the WiHD standard, a detailed description thereof is omitted here.

4 illustrates a structure of a high rate PHY (HRP) MAC packet according to a third embodiment of the present invention.

The "Encryption Type" field 425 of the HRP MAC header 410 refers to a type of copy protection technology of content transmitted in a WiHD wireless network. This embodiment defines "0", "1", "2", "3" as the value of the "Encryption Type" field 425, and each value is "No encryption", "DTCP encryption", "HDCP2". .0 encryption "," Reserved ". In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied. In this embodiment, the "Encryption Type" field 425 is described using the "Reserved" field 423 of the "CP header" field 420 of the HRP MAC header 410.

The WiHD transmission device 110 segments the AV data 140 into a plurality of MAC subpackets 470 when the AV data 140 is configured as a MAC payload.

The "InputCtr" field 473 of the HRP MAC subpacket 470 means input counter information calculated by accumulating the number of MAC subpackets. The "InputCtr" field 473 is described using the CP sub packet header 471 of the HRP MAC sub packet 470.

The HDCP module 153 of the WiHD receiver device 150 uses the stream counter information and the "InputCtr" field 473 together with the session key information when the "Encryption Type" field 425 is "HDCP2.0 encryption". The encrypted AV data 140 is decrypted. In this embodiment, the stream counter information is calculated directly from a stream identifier for identifying a stream for AV data transmission using a predetermined algorithm. In the present embodiment, the stream counter information is not transmitted from the WiHD transmitting device 110 and means the same value as the stream counter information used by the HDCP module 113 of the WiHD transmitting device 110 to encrypt the AV data 140. do. Accordingly, the WiHD transmitting device 110 and the WiHD receiving device 150 directly calculate the stream counter information from the stream identifier using the same predetermined algorithm.

Since fields of other HRP MAC packets follow the WiHD standard, a detailed description thereof is omitted here.

5 illustrates a Low Rate PHY (LRP) MAC packet structure according to an embodiment of the present invention.

The WiHD transmission device 110 uses LRP MAC packets when transmitting audio data. The "Encryption Type" field 525 of the LRP MAC header 510 refers to a type of copy protection technology of content transmitted in a WiHD wireless network. This embodiment defines "0", "1", "2", "3" as the value of the "Encryption Type" field 525, and each value is "No encryption", "DTCP encryption", "HDCP2". .0 encryption "," Reserved ". In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied. In this embodiment, the "Encryption Type" field 525 is described using the "Reserved" field 523 of the "CP header" field 520 of the LRP MAC header 510.

The " StreamCtr " field 573 of the LRP MAC subpacket 570 is stream counter information, which is information for identifying multimedia streams transmitted between transmitting and receiving devices. In the present embodiment, the "StreamCtr" field 573 is described using the CP sub packet header 571 of the LRP MAC sub packet 570. The “InputCtr” field 575 of the LRP MAC subpacket 570 means input counter information calculated by accumulating the number of MAC subpackets. The "InputCtr" field 575 is described using the CP sub packet header 571 of the LRP MAC sub packet 570.

The HDCP module 153 of the WiHD receiver device 150 may display the "StreamCtr" field 573 and the "InputCtr" field 575 when the "Encryption Type" field 525 is "HDCP2.0 encryption". And decrypts the encrypted audio data 140.

Since fields of other LRP MAC packets follow the WiHD standard, a detailed description thereof is omitted here.

6 illustrates a Low Rate PHY (LRP) MAC packet structure according to a second embodiment of the present invention.

The "Encryption Type" field 625 of the LRP MAC header 610 refers to a type of copy protection technology of content transmitted in a WiHD wireless network. This embodiment defines "0", "1", "2", "3" as the value of the "Encryption Type" field 625, and each value is "No encryption", "DTCP encryption", "HDCP2". .0 encryption "," Reserved ". In the present embodiment, the type of the copy protection technology of the content is illustrated as DTCP or HDCP, it is apparent to those skilled in the art that other types of copy protection technology can be applied. In this embodiment, the "Encryption Type" field 625 is described using the "Reserved" field 623 of the "CP header" field 620 of the LRP MAC header 610.

The "InputCtr" field 673 of the LRP MAC subpacket 670 refers to input counter information calculated by accumulating the number of MAC subpackets. The "InputCtr" field 673 is described using the CP sub packet header 671 of the LRP MAC sub packet 670.

The HDCP module 153 of the WiHD receiving device 150 uses the stream counter information and the "InputCtr" field 673 together with the session key information when the "Encryption Type" field 625 is "HDCP2.0 encryption". The encrypted audio data 140 is decrypted. In this embodiment, the stream counter information is calculated directly from a stream identifier for identifying a stream for audio data transmission using a predetermined algorithm. In the present embodiment, the stream counter information is not transmitted from the WiHD transmitting device 110 and means the same value as the stream counter information used by the HDCP module 113 of the WiHD transmitting device 110 to encrypt the audio data 140. do. Accordingly, the WiHD transmitting device 110 and the WiHD receiving device 150 directly calculate the stream counter information from the stream identifier using the same predetermined algorithm.

Since fields of other LRP MAC packets follow the WiHD standard, a detailed description thereof is omitted here.

7 illustrates a MAC Capability Information Element (IE) packet structure according to an embodiment of the present invention.

The MAC Capability IE 710 is a packet transmitted when a WiHD device joining a network receives a beacon from a coordinator of a WiHD wireless network, and includes various capability information of the WiHD device.

The "HDCP2.0 support bit" 723 is a type of copy protection technology supported by the WiHD device, indicating whether "HDCP" is supported. The "HDCP2.0 support bit" 723 is described using the "Reserved" field 721 of the "MAC capability bitmap" field 720 of the MAC Capability IE 710.

The "DTCP support bit" 725 is a type of copy protection technology supported by the WiHD device and indicates whether "DTCP" is supported. The "DTCP support bit" 725 is described using the "Reserved" field 721 of the "MAC capability bitmap" field 720 of the MAC Capability IE 710.

Since the other "MAC capability bitmap" fields 720 conform to the WiHD standard, a detailed description thereof is omitted here.

8 is a flowchart illustrating a copy protection process of a WiHD transmission device according to an embodiment of the present invention.

At step 810, the WiHD transmission device 110 determines the type of copy protection technique of the content transmitted in the WiHD wireless network. In the present embodiment, the type of the copy protection technology of the content is illustrated as "No encryption", "DTCP encryption" and "HDCP2.0 encryption", but other types of copy protection technology may be applied to the technical field to which the present invention belongs. It is self-evident to those of ordinary knowledge in Esau.

In step 820, the WiHD transmitting device 110 accumulates and calculates the number of MAC subpackets constituting a MAC payload including content as input counter information.

In step 830, the WiHD transmitting device 110 packetizes the determined type of copy protection technique and the calculated input counter information, respectively, using the MAC packet. The WiHD transmission device 110 may also packetize the stream counter information calculated from the stream identifier using the MAC packet.

The WiHD transmitting device 110 packetizes the type of anti-copy technique using the CP header of the MAC packet, and packetizes the input counter information using the CP subpacket header of the MAC subpacket. The WiHD transmitting device 110 may packetize the stream counter information by using the MAC header of the MAC packet or the MAC subpacket header of the MAC subpacket.

At step 840, the WiHD transmitting device 110 sends a MAC packet to the WiHD receiving device. The payload of the MAC packet includes content encrypted using input counter information and stream counter information calculated from the stream identifier.

9 is a flowchart illustrating a copy protection process of a WiHD receiving device according to an embodiment of the present invention.

In step 910, the WiHD receiving device 150 receives a MAC packet from the WiHD transmitting device that includes the type of copy protection technique and the input counter information. The input counter information refers to the number of MAC subpackets that segment the encrypted content.

In step 920, the WiHD receiving device 150 obtains stream counter information calculated from the stream identifier. If the MAC packet received in step 910 includes stream counter information, the WiHD receiving device 150 may obtain the stream counter information by depacking the MAC packet. If the MAC packet received in step 910 does not include stream counter information, the WiHD receiving device 150 may directly calculate the stream counter information from a stream identifier for identifying a stream for content transmission.

In operation 930, the WiHD receiving device 150 decrypts the encrypted content using the input counter information and the stream counter information.

10 shows a schematic structure of a WiHD transmission device 1000 according to an embodiment of the present invention.

The WiHD transmission device 1000 includes a copy protection technology type determiner 1010, an input counter calculator 1020, a packetizer 1030, and a transmitter 1040.

The copy protection technology type determination unit 1010 determines the type of the copy protection technology of the content transmitted in the WiHD wireless network.

The input counter calculator 1020 accumulates and calculates the number of MAC subpackets constituting a MAC payload including content as input counter information.

The stream counter calculator (not shown) calculates stream counter information from a stream identifier for identifying a stream for content transmission.

The packetizer 1030 packetizes the type of the copy protection technique and the calculated input counter information, respectively, using the MAC packet. The packetizer 1030 packetizes the type of copy protection technique using the CP header of the MAC packet, and packetizes the input counter information using the CP subpacket header of the MAC subpacket. The packetizer 1030 may packetize the stream counter information by using the MAC header of the MAC packet or the MAC subpacket header of the MAC subpacket. The packetizer 1030 may packetize the type of the copy protection technology of the content by using a MAC Capability Information Element (IE) transmitted when a transmitting device joins a WiHD wireless network.

The transmitter 1040 transmits the MAC packet to the WiHD receiving device. The MAC packet may be an HRP MAC packet or an LRP MAC packet. The payload of the MAC packet includes content encrypted using input counter information and stream counter information.

11 illustrates a schematic structure of a WiHD receiving device 1100 according to an embodiment of the present invention.

The WiHD receiving device 1100 includes a receiver 1110, a stream counter acquirer 1120, and a decoder 1130.

The receiving unit 1110 receives a MAC packet including a type of copy protection technology and input counter information from the WiHD transmitting device. The MAC packet may be an HRP MAC packet or an LRP MAC packet. The input counter information refers to the number of MAC subpackets that segment the encrypted content.

The stream counter obtainer 1120 obtains stream counter information calculated from the stream identifier. When the MAC packet received by the receiver includes the stream counter information, the WiHD receiving device 150 may obtain the stream counter information by depacking the MAC packet. If the MAC packet received by the receiver does not include the stream counter information, the WiHD receiving device 150 may directly calculate the stream counter information from the stream identifier for identifying the stream for content transmission.

The decryption unit 1130 decrypts the encrypted content using the input counter information and the stream counter information.

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

For example, the WiHD transmitting device 1000 or the WiHD receiving device 1100 according to an exemplary embodiment of the present invention is a bus coupled to respective units of the device as shown in FIGS. 10 and 11, respectively. At least one processor coupled to the bus for storing instructions, received or generated messages, the at least one processor coupled to the bus for performing instructions as described above. It may include a memory coupled to.

In addition, the system according to the present invention can be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. The computer-readable recording medium may be a magnetic storage medium (for example, a ROM, a floppy disk, a hard disk, etc.), an optical reading medium (for example, a CD-ROM, a DVD, etc.), and a carrier wave (for example, the Internet). Storage medium). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

1 is a schematic diagram illustrating a copy protection method of a WiHD device according to an embodiment of the present invention.

2 illustrates a High Rate PHY (MAP) MAC packet structure according to an embodiment of the present invention.

3 shows a structure of a high rate PHY (HRP) MAC packet according to a second embodiment of the present invention.

4 illustrates a structure of a high rate PHY (HRP) MAC packet according to a third embodiment of the present invention.

5 illustrates a Low Rate PHY (LRP) MAC packet structure according to an embodiment of the present invention.

6 illustrates a Low Rate PHY (LRP) MAC packet structure according to a second embodiment of the present invention.

7 illustrates a MAC Capability Information Element (IE) packet structure according to an embodiment of the present invention.

8 is a flowchart illustrating a copy protection process of a WiHD transmission device according to an embodiment of the present invention.

9 is a flowchart illustrating a copy protection process of a WiHD receiving device according to an embodiment of the present invention.

10 shows a schematic structure of a WiHD transmission device according to an embodiment of the present invention.

11 shows a schematic structure of a WiHD receiving device according to an embodiment of the present invention.

Claims (25)

Determining a type of copy protection technology for content transmitted in a Wi-Fi (WirelessHD) wireless network; Accumulating and counting the number of MAC subpackets constituting a media access control (MAC) payload including the content as input counter information; Packetizing the determined type of copy protection technique and the calculated input counter information, respectively, using a MAC packet; And And transmitting the MAC packet to a WiHD receiving device. The method of claim 1, The type of the copy protection technology of the content includes at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP). The method of claim 1, The packetizing may packetize the determined copy protection technique using the CP header of the MAC packet, And copying the calculated input counter information using a CP sub packet header of the MAC sub packet. The method of claim 1, And calculating stream counter information from a stream identifier for identifying the stream for transmitting the content. The method of claim 4, wherein Packetizing the stream counter information using the MAC header of the MAC packet or the MAC subpacket header of the MAC subpacket. The method of claim 4, wherein And the MAC payload comprises the content encrypted using the input counter information and the stream counter information. The method of claim 1, Packetizing the type of the copy protection technique of the content by using a MAC Capability Information Element (IE) transmitted when a WiHD transmitting device joins the WiHD wireless network. The copy protection method of the WiHD transmitting device. The method of claim 1, And the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network. MAC packet including input counter information that calculates the number of MAC subpackets constituting a media access control (MAC) payload including encrypted content and a type of copy protection technology of content transmitted in a WiHD (WirelessHD) wireless network Receiving from the WiHD transmitting device; Obtaining stream counter information calculated from a stream identifier for identifying a stream for transmitting the content; And And decrypting the encrypted content by using the input counter information and the stream counter information. The method of claim 9, The type of the copy protection technology of the content includes at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP). The method of claim 9, Acquiring the stream counter information Depacketizing the MAC packet when the received MAC packet includes the stream counter information, or directly calculating stream counter information from a stream identifier for identifying the stream for content transmission. Copy protection method. The method of claim 9, And the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network. A copy protection technology type determination unit for determining a type of copy protection technology of content transmitted in a Wi-Fi (WirelessHD) wireless network; An input counter calculator configured to accumulate and count, as input counter information, the number of MAC subpackets constituting a media access control (MAC) payload including the content; A packetizer configured to packetize the determined copy protection technique and the calculated input counter information by using a MAC packet; And And a transmitting unit for transmitting the MAC packet to a WiHD receiving device. The method of claim 13, The type of the copy protection technology of the content is a WiHD transmission device, characterized in that at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP). The method of claim 13, The packetization unit packetizes the determined type of copy protection technology by using the CP header of the MAC packet, And the calculated input counter information is packetized using a CP subpacket header of the MAC subpacket. The method of claim 13, And a stream counter calculator for calculating stream counter information from the stream identifier for identifying the stream for transmitting the content. The method of claim 16, And the packetization unit packetizes the stream counter information by using a MAC header of the MAC packet or a MAC subpacket header of the MAC subpacket. The method of claim 16, And the MAC payload includes the content encrypted using the input counter information and the stream counter information. The method of claim 13, The packetization unit packetizes the type of the copy protection technology of the content by using a MAC Capability Information Element (IE) transmitted when the WiHD transmitting device joins a WiHD wireless network. device. The method of claim 13, And the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network. MAC packet including input counter information that calculates the number of MAC subpackets constituting a media access control (MAC) payload including encrypted content and a type of copy protection technology of content transmitted in a WiHD (WirelessHD) wireless network Receiving unit for receiving from the WiHD transmitting device; A stream counter obtainer for obtaining stream counter information calculated from a stream identifier for identifying the stream for transmitting the content; And And a decryption unit for decrypting the encrypted content by using the input counter information and the stream counter information. The method of claim 21, And the type of the copy protection technology of the content comprises at least one of Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP). The method of claim 21, The stream counter acquisition unit And if the received MAC packet includes the stream counter information, depacketize the MAC packet or directly calculate stream counter information from a stream identifier for identifying the stream for content transmission. The method of claim 21, And the MAC packet is a High Rate PHY (HRP) MAC packet or a Low Rate PHY (LRP) MAC packet transmitted in the WiHD wireless network. A computer-readable recording medium having recorded thereon a program for performing the method according to claim 1 or 12.

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