JP2011119793A - Content transmitter, content transmission method, and content transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content transmitter, a content transmission method, and a content transmission system, capable of adaptively outputting contents requiring copy limitation and contents not requiring the copy limitation to a reception side device, improving convenience for a user and being suitable for practical use. <P>SOLUTION: A transmission side device (11) is made to detect whether or not the reception side device (12) is in a power supply state. When the reception side device (12) is in the power supply state, the transmission side device (11) is made perform authentication processing with the reception side device (12). When authentication fails, the contents not requiring the copy limitation are transmitted from the transmission side device (11) to the reception side device (12) without encrypting them. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improved content transmission apparatus, content transmission method, and content transmission system for encrypting and transmitting content that requires copy restriction after authentication with a receiving device.

  As is well known, the DVI (digital visual interface) standard is widely used as a standard for transmitting digitized video data. In recent years, the high definition multimedia interface (HDMI) standard has been adopted as a digital signal transmission standard that further improves the DVI standard.

  In the HDMI standard, for example, it is possible to multiplex digital audio data during the blanking period of digital video data and perform audio transmission, in addition to transmitting digital video data in the form of RGB signals, YCbCr signal Can be transmitted in the form of a YPbPr signal of higher quality or higher, and can be connected with a USB (universal serial bus) -like small HDMI connector, etc. Is included.

  By the way, when contents such as digital video data and digital audio data that require copy restrictions are transmitted using a digital transmission standard that conforms to the DVI standard or the HDMI standard, the content is illegally copied. In order to prevent this and protect the copyright, a copy guard system called HDCP (high-bandwidth digital content protection) is adopted.

  In this HDCP system, a content transmission side device executes an authentication process on a reception side device, and when authentication is established, the content is encrypted and transmitted. The receiving device decrypts the received encrypted content and performs video display, audio playback, and the like. In this case, the transmitting device transmits the encrypted content while confirming whether or not the receiving device has been impersonated by repeatedly performing authentication processing for the receiving device at regular intervals even after the authentication is established. Is doing.

  On the other hand, for content that does not require copy restrictions, of course, it is not necessary to take measures against unauthorized copying, that is, it is not necessary to perform authentication processing or content encryption in the HDCP method, and the plain text remains unchanged. The content can be transmitted as a video stream or an audio stream.

  In the market, there are many receiving side devices such as graphic boards and monitors that do not support the HDCP system. For this reason, it is necessary to assume that a receiving-side device that does not support the HDCP method is connected as a transmitting-side device that supports the HDCP method. In other words, when a receiving device that is not compatible with the HDCP method is connected, the transmitting device compatible with the HDCP method fails to authenticate even if the authentication process is executed. It is desirable to determine that a non-compatible receiving device is connected and to enable transmission of content that does not require copy guard.

  However, the reason why the transmitting device compatible with the HDCP method fails in the authentication process is not only the case where the receiving device not compatible with the HDCP method is connected, but also the receiving device compatible with the HDCP method is connected. Even in this case, for example, although the receiving device is not ready for authentication processing, such as when the power is turned off, the transmitting device compatible with the HDCP system executes the authentication processing. It is possible that this will happen.

  Assuming that there is such a case, even if the transmitting-side device compatible with the HDCP method fails in the authentication, the connected receiving-side device may be in a state where authentication processing is possible at any time. There is a need to continuously try the authentication process. In other words, even if a receiving device compatible with the HDCP method is connected, the authentication may fail, so that the transmitting device compatible with the HDCP method is not compatible with the HDCP method even if the authentication fails. It is determined that a compatible receiving device is connected, and it is not possible to switch so that only content that does not require copy restrictions can be transmitted, which reduces convenience for the user.

  In Patent Document 1, the switching control unit of the television receiver switches the internal connection of the changeover switch to the digital input terminal side, determines whether or not the DVI cable is connected thereto, and the DVI cable is connected. In such a configuration, HDCP authentication is started if the switch is connected, and if HDCP authentication fails, the internal connection of the changeover switch is switched to the analog input terminal side that is the input terminal for the composite signal or component signal. Yes.

JP 2006-050170 A

  Therefore, the present invention has been made in consideration of the above circumstances, and can adaptively output content that requires copy restriction and content that does not require copy restriction to the receiving device, which is convenient for the user. It is an object of the present invention to provide a content transmission device, a content transmission method, and a content transmission system that are highly suitable for practical use.

  The content transmitting apparatus according to the present invention is intended for an apparatus that encrypts and transmits content that requires copy restriction after authentication with a receiving device. And detecting means for detecting whether or not the receiving side device is in a power-on state; and when the detecting unit detects that the receiving side device is in a power-on state, authentication processing is performed on the receiving side device. An authentication unit and a transmission unit that transmits, without encryption, content that does not require copy restriction to the receiving device when authentication by the authentication unit fails.

  In addition, the content transmission method according to the present invention is intended for a method of encrypting and transmitting content that requires copy restriction after authentication with the receiving device. A step of detecting whether or not the receiving device is in a power-on state; a step of performing authentication processing on the receiving device when it is detected that the receiving device is in a power-on state; And a step of transmitting, without encryption, content that does not require copy restriction to the receiving device.

  Furthermore, the content transmission system according to the present invention is intended for a system in which a transmitting device encrypts and transmits content that requires copy restriction after authentication with a receiving device. Then, when the detecting device detects whether the receiving device is in a power-on state, the detecting device that detects whether the receiving device is in a power-on state, and when the detecting device detects that the receiving device is in a power-on state, Authentication means for performing authentication processing with the receiving side device, and transmitting means for causing the transmitting side device to transmit content that does not require copy restriction to the receiving side device without encryption when authentication by the authenticating unit fails. It is intended to provide.

  According to the above-described invention, when it is detected that the receiving side device is in the power-on state, the transmitting side device performs the authentication process with the receiving side device. Content that does not require copy restrictions is sent without encryption, enabling content that requires copy restrictions and contents that do not require copy restrictions to be output adaptively to the receiving device. It will be more practical and suitable for practical use.

The block block diagram shown in order to show the embodiment of this invention and to demonstrate the outline of a content transmission system. The block block diagram shown in order to demonstrate the signal processing system of the optical disk recording / reproducing apparatus which comprises the content transmission system in the embodiment. The block block diagram shown in order to demonstrate an example of the television broadcast receiver which comprises the content transmission system in the embodiment. The block block diagram shown in order to demonstrate the other example of the television broadcast receiver which comprises the content transmission system in the embodiment. The flowchart shown in order to demonstrate a part of main processing operation which the optical disk recording / reproducing apparatus in the embodiment performs. 6 is a flowchart shown for explaining another part of the main processing operation performed by the optical disc recording / reproducing apparatus in the embodiment. The flowchart shown in order to demonstrate the remainder of the main processing operations which the optical disk recording / reproducing apparatus in the embodiment performs.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of a content transmission system described in this embodiment. In this content transmission system, an optical disk recording / playback device 11 as a content transmission side device and a television broadcast reception device 12 as a content reception side device are connected by a digital interface system compliant with the HDMI standard.

  FIG. 1 shows a state where an optical disk recording / reproducing apparatus 11 and a television broadcast receiving apparatus 12 are connected by a transmission cable 13 compatible with the HDCP system. Among these, the optical disk recording / reproducing apparatus 11 records and reproduces digitized contents such as video and audio on an optical disk such as a DVD (digital versatile disk).

  The television broadcast receiver 12 receives digital or analog television broadcasts and performs video display and audio reproduction of the program content. Further, the television broadcast receiving apparatus 12 can also perform video display and audio reproduction of the content supplied from the optical disc recording / reproducing apparatus 11.

  The transmission cable 13 corresponding to the HDCP system includes a + 5V power line 13a, an HPD (hot plug detect) line 13b, a DDC (display data channel) line 13c, and a TMDS (transition minimized differential signaling) line 13d. I have.

  Here, when transmitting the content to the television broadcast receiving device 12, the optical disc recording / reproducing device 11 first inverts the + 5V power line 13a of the transmission cable 13 from L (low) level to H (high) level. Then, the television broadcast receiver 12 is informed of its own connection. Then, the television broadcast receiver 12 sets the HPD line 13b of the transmission cable 13 to the H level and informs the optical disc recording / reproducing apparatus 11 of its own connection.

  When the mutual connection is confirmed in this way, the optical disc recording / reproducing apparatus 11 acquires EDID (extended display identification data) that is attribute information from the television broadcast receiving apparatus 12 via the DDC line 13c, Various types of information relating to the resolution and color space that can be displayed by the television broadcast receiver 12 are obtained.

  Thereafter, the optical disc recording / reproducing apparatus 11 performs authentication processing for the television broadcast receiving apparatus 12 by exchanging keys with the television broadcast receiving apparatus 12 in the HDCP system via the DDC line 13c. When the authentication is established, the optical disc recording / reproducing device 11 encrypts the content to be transmitted to the television broadcast receiving device 12, and transmits the encrypted content to the television broadcast receiving device 12 via the TMDS line 13d. .

  As a result, the television broadcast receiving device 12 decrypts the encrypted content supplied from the optical disc recording / reproducing device 11 and executes video display and audio reproduction thereof. Thereafter, the optical disc recording / reproducing apparatus 11 repeats the authentication process for the television broadcast receiving apparatus 12 at a fixed period, and confirms whether or not the television broadcast receiving apparatus 12 has been impersonated. Sending.

  FIG. 2 shows a main signal processing system of the optical disc recording / reproducing apparatus 11 described above. That is, a satellite digital broadcast signal received by a BS (broadcasting satellite) / CS (communication satellite) digital broadcast receiving antenna 14 is supplied to a satellite digital broadcast tuner unit 16 via an input terminal 15. A broadcast signal of a desired channel is selected.

  The broadcast signal selected by the tuner unit 16 is supplied to a PSK (phase shift keying) demodulating unit 17 to demodulate a TS (transport stream). The TS is supplied to the TS processing unit 18, decoded into a digital video signal, an audio signal, and the like, and then output to the signal processing unit 19.

  The terrestrial digital television broadcast signal received by the terrestrial broadcast receiving antenna 20 is supplied to the digital terrestrial broadcast tuner unit 22 via the input terminal 21 so that the broadcast signal of the desired channel is selected. Bureau.

  Then, the broadcast signal selected by the tuner unit 22 is supplied to an OFDM (orthogonal frequency division multiplexing) demodulating unit 23 to demodulate the TS. The TS is supplied to the TS processing unit 18, decoded into a digital video signal and audio signal, and then output to the signal processing unit 19.

  The terrestrial analog television broadcast signal received by the terrestrial broadcast receiving antenna 20 is supplied to the terrestrial analog broadcast tuner unit 24 via the input terminal 21 so that the broadcast signal of the desired channel is received. To be selected. The broadcast signal selected by the tuner unit 24 is supplied to the analog demodulation unit 25, demodulated into an analog video signal and audio signal, and then output to the signal processing unit 19.

  Here, the signal processing unit 19 performs predetermined digital signal processing on the digital video signal and audio signal supplied from the TS processing unit 18 and outputs them to the graphic processing unit 26 and the audio processing unit 27. . The signal processing unit 19 digitizes the analog video signal and audio signal supplied from the analog demodulation unit 25, and performs predetermined digital signal processing on the digitized video signal and audio signal. Thereafter, the data is output to the graphic processing unit 26 and the audio processing unit 27.

  Among these, the graphic processing unit 26 has a function of superimposing and outputting the OSD signal generated by the OSD (on screen display) signal generation unit 28 on the digital video signal supplied from the signal processing unit 19. Further, the graphic processing unit 26 selectively outputs the video signal output from the signal processing unit 19 and the OSD signal output from the OSD signal generation unit 28, and both the video signals are each half of the screen. Can be combined and output.

  The digital video signal output from the graphic processing unit 26 is supplied to the video processing unit 29. The video processing unit 29 converts the input digital video signal into an analog video signal of a predetermined format and can be derived to the outside via the output terminal 30. The audio processing unit 27 converts the input digital audio signal into an analog audio signal of a predetermined format and can be derived outside via the output terminal 31.

  Here, in the optical disc recording / reproducing apparatus 11, all the operations including the above-described various receiving operations and the recording / reproducing operations described below are comprehensively controlled by the control unit 32. The control unit 32 includes a central processing unit (CPU) 32 a and is sent from the operation unit 33 installed in the main body of the optical disc recording / reproducing apparatus 11 or sent from the remote controller 34 and received by the reception unit 35. Each unit is controlled to receive the received operation information and reflect the operation content.

  In this case, the control unit 32 uses the memory unit 32b. The memory unit 32b mainly includes a read only memory (ROM) storing a control program executed by the CPU 32a, a random access memory (RAM) for providing a work area to the CPU 32a, and various setting information and control information. And so on.

  A disk drive unit 36 is connected to the control unit 32. The disk drive unit 36 is configured to allow an optical disk 37 such as a DVD to be detachable, and has a function of recording / reproducing digital data with respect to the mounted optical disk 37.

  Then, the control unit 32 operates in the MPEG (moving picture experts group) 2-TS obtained from the TS processing unit 18 based on an operation of the operation unit 33 or the remote controller 34, an instruction of a control program executed by the CPU 32a, or the like. After the digital signal is encrypted by the encryption / decryption unit 38, the digital signal can be supplied to the disk drive unit 36 and recorded on the optical disk 37.

  Further, the control unit 32 uses the encoder 39 to output analog video signals and audio signals obtained from the analog demodulation unit 25 based on the operation of the operation unit 33 or the remote controller 34 or instructions of a control program executed by the CPU 32a. After conversion to MPEG2-TS and encryption by the encryption / decryption unit 38, control can be performed so as to be supplied to the disk drive unit 36 and recorded on the optical disk 37.

  The control unit 32 causes the disk drive unit 36 to read the MPEG2-TS from the optical disc 37 based on the operation of the operation unit 33 or the remote controller 34, an instruction of a control program executed by the CPU 32a, and the like. After being decoded by the decoding unit 38, by supplying it to the TS processing unit 18, it can be controlled to be used for the generation of the analog video signal and audio signal described above.

  Further, an HDD (hard disk drive) 40 is connected to the control unit 32. Then, the control unit 32 operates in the MPEG (moving picture experts group) 2-TS obtained from the TS processing unit 18 based on an operation of the operation unit 33 or the remote controller 34, an instruction of a control program executed by the CPU 32a, or the like. After the digital signal is encrypted by the encryption / decryption unit 38, the digital signal can be controlled to be supplied to the HDD 40 and recorded on the hard disk 40a.

  The control unit 32 uses an encoder 39 to output analog video signals and audio signals obtained from the analog demodulation unit 25 based on the operation of the operation unit 33 or the remote controller 34, an instruction of a control program executed by the CPU 32a, or the like. After conversion into MPEG2-TS and encryption by the encryption / decryption unit 38, control can be performed so as to be supplied to the HDD 40 and recorded on the hard disk 40a.

  Further, the control unit 32 causes the HDD 40 to read the MPEG2-TS from the hard disk 40a based on the operation of the operation unit 33 or the remote controller 34, an instruction of a control program executed by the CPU 32a, and the like. After being decoded by the unit 38, by supplying it to the TS processing unit 18, it can be controlled to be used for the generation of the analog video signal and audio signal described above.

  The control unit 32 records the data read from the optical disk 37 by the disk drive unit 36 on the hard disk 40a by the HDD 40 based on the operation of the operation unit 33 or the remote controller 34 or the instruction of the control program executed by the CPU 32a. Can be controlled.

  Further, the control unit 32 records the data read from the hard disk 40a by the HDD 40 on the optical disk 37 by the disk drive unit 36 based on the operation of the operation unit 33 or the remote controller 34 or the instruction of the control program executed by the CPU 32a. Can be controlled.

  In addition, a digital transmission / reception unit 41 is connected to the control unit 32. The digital transmission / reception unit 41 has a digital interface function corresponding to the HDCP system, for example, in conformity with the HDMI standard, the DVI standard, or the like, and is connected to an external receiving side device (in this case, a television set) connected to the input / output terminal 42. Data transmission between the broadcast receiving device 12) and the control unit 32 is enabled.

  For this reason, the control unit 32 is connected to an external device compatible with the HDCP system via the digital transmission / reception unit 40 and the input / output terminal 41 based on an operation of the operation unit 33 or the remote controller 34 or an instruction of a control program executed by the CPU 32a. Authentication processing with the receiving device (in this case, the television broadcast receiving device 12), processing for encrypting the content and transmitting it to the receiving device, and the like.

  As a result, various contents such as a received television broadcast program, data read from the optical disk 37 by the disk drive unit 36, and data read from the hard disk 40 a by the HDD 40 are externally transmitted via the digital transmission / reception unit 40 and the input / output terminal 41. It is transmitted to the receiving side device (in this case, the television broadcast receiving device 12) and used for video display, audio reproduction, and the like.

  FIG. 3 shows an example of a receiving side device (in this case, the television broadcast receiving device 12) compatible with the HDCP system. The television broadcast receiver 12 includes an optical disc recording / reproducing device 11 that is a transmission side device and an HDCP interface 43 for performing data transmission by the HDCP method. The HDCP interface 43 is in a driving state when the television broadcast receiver 12 is powered on.

  Also, the television broadcast receiver 12 includes an input terminal 44 to which the + 5V power line 13a is connected, an output terminal 45 to which the HPD line 13b is connected, and a DDC line 13c in the HDCP transmission cable 13. An input / output terminal 46 to be connected and an input terminal 47 to which the TMDS line 13d is connected are provided.

  When the optical disk recording / reproducing apparatus 11 inverts the + 5V power line 13a from L level to H level, the information is supplied to the HDCP interface 47 via the input terminal 44, so that the HDCP interface 47 can be used for television broadcasting. If the receiving device 12 is powered on and in a driving state, the connection of the optical disc recording / reproducing device 11 can be confirmed.

  In addition, the output terminal 45 is a power source that becomes a H level when a predetermined reference DC voltage level + B is applied in a state where the power of the television broadcast receiver 12 is turned on regardless of the level of the + 5V power line 13a. The terminal 48 is connected. For this reason, if the television broadcast receiving device 12 is in the power-on state, the HPD line 13b becomes H level via the output terminal 45, and the optical disc recording / reproducing device 11 confirms the connection of the television broadcast receiving device 12. Can do.

  Further, the input / output terminal 46 is connected to the HDCP interface 43 and to an EDID memory 49 in which EDID related to the television broadcast receiver 12 is stored. The EDID memory 49 is also connected to the power supply terminal 48, and is in a driving state when the television broadcast receiver 12 is turned on and a predetermined reference DC voltage level + B is supplied from the power supply terminal 48. .

  Therefore, the optical disc recording / reproducing apparatus 11 accesses the EDID memory 49 via the DDC line 13c and the input / output terminal 46 when the television broadcast receiving apparatus 12 is in the power-on state, and the EDID related to the television broadcast receiving apparatus 12 is accessed. Can be obtained. Further, when the television broadcast receiving device 12 is in the power-on state, the optical disc recording / reproducing device 11 can perform authentication processing by exchanging keys with the HDCP interface 43 via the DDC line 13c and the input / output terminal 46. it can.

  Further, the input terminal 47 is connected to the HDCP interface 43. As a result, if the television broadcast receiving device 12 is turned on and in a driving state, the encrypted content output from the optical disc recording / reproducing device 11 to the TMDS line 13d is supplied to the HDCP interface 43 via the input terminal 47. Then, it is decoded and used for video display, audio reproduction, and the like.

  FIG. 4 shows another example of the receiving side device (in this case, the television broadcast receiving device 12) compatible with the HDCP system. In FIG. 4, the same reference numerals are given to the same parts as those in FIG. 3. The output terminal 45 and the EDID memory 49 are connected to the input terminal 44 instead of the power supply terminal 48. For this reason, when the optical disk recording / reproducing device 11 inverts the + 5V power line 13a from the L level to the H level regardless of whether or not the television broadcast receiving device 12 is in the power-on state, the HPD is output via the output terminal 45. The line 13b becomes H level, and the optical disc recording / reproducing apparatus 11 can confirm the connection of the television broadcast receiving apparatus 12.

  When the optical disc recording / reproducing apparatus 11 sets the + 5V power line 13a from the L level to the H level, the EDID memory 49 is driven. Therefore, the optical disc recording / reproducing apparatus 11 can obtain the EDID by accessing the EDID memory 49 via the DDC line 13c and the input / output terminal 46.

  As described above, as shown in FIG. 3, the receiving side device (in this case, the television broadcast receiving device 12) compatible with the HDCP system has + 5V from the transmitting side device (in this case, the optical disc recording / reproducing device 11). FIG. 4 shows a type in which the HPD line 13b becomes H level when the power is turned on and the EDID memory 49 is driven (hereinafter referred to as an independent power source type) regardless of the level setting of the power line 13a. As described above, when the transmission side device (in this case, the optical disc recording / reproducing apparatus 11) sets the + 5V power line 13a to the H level regardless of whether or not the power is turned on, the HPD line 13b becomes the H level and the EDID memory. There are two types, 49 (hereinafter referred to as an interlocked power supply type) in which 49 is in a driving state.

  By the way, the case where content that requires copy restriction is transmitted from the transmission side device to the reception side device has been described above. However, some content to be transmitted does not require copy restriction. In the case of such content, there is no need to take measures against illegal copying, that is, there is no need to perform authentication processing or content encryption in the HDCP method, and the content is transmitted as a plain text video stream or audio stream. can do.

  In addition, a receiving-side device that does not support the copy guard method (in this case, the HDCP method) may be connected to the transmitting-side device. That is, in practice, it is necessary to assume that a receiving-side device that does not support the HDCP method is connected to a transmitting-side device that supports the HDCP method.

  In such a case, the transmitting device fails to authenticate even if it performs authentication processing with the receiving device. Therefore, if authentication fails, a receiving device that does not support the HDCP system is connected. It is desirable to enable transmission of content that does not require copy restrictions.

  However, the reason why the transmitting device compatible with the HDCP method fails in the authentication process is not only the case where the receiving device not compatible with the HDCP method is connected, but also the receiving device compatible with the HDCP method is connected. Even in this case, for example, even though the receiving device is not ready for authentication processing, such as when the power is not turned on, the transmitting device compatible with the HDCP system executes the authentication processing. It is possible that this will happen.

  Considering that this is the case, it is possible that the receiving device compatible with the HDCP system may be ready for authentication processing when the connected receiving device fails even if authentication fails. Therefore, it is necessary to continuously try the authentication process. In other words, even if a receiving device compatible with the HDCP method is connected, the authentication may fail, so that the transmitting device compatible with the HDCP method is not compatible with the HDCP method even if the authentication fails. Since it is determined that a corresponding receiving device is connected, it is not possible to switch so that only content that does not require copy restrictions can be transmitted, which reduces the convenience for the user.

  Therefore, in this embodiment, the transmitting-side device (optical disc recording / reproducing device 11) compatible with the HDCP system is connected to the receiving-side device (television broadcast receiving device 12), and the HPD line 13b is at the H level. It is determined whether or not. When it is determined that the HPD line 13b is at the H level with the independent power supply type, if the authentication is established, the encrypted content is transmitted. If the authentication failure continues for a predetermined time, It is determined that the connected receiving device is not compatible with the HDCP system, and transmission of content that does not require copy restriction is enabled.

  That is, when the receiving side device is an independent power supply type and the HPD line 13b is at the H level, the receiving side device is in a power-on state, and the HDCP interface 43 is in a drive state, that is, can cope with authentication processing. It means that it is in a state. And even though the HDCP interface 43 is ready for authentication processing, the failure of authentication continues for a preset time, which means that the connected receiving device does not support the HDCP system. Can be determined. For this reason, it is possible to set the transmission-side device so as to enable transmission only for content that does not require copy restrictions, and it is possible to improve convenience for the user.

  5 to 7, the control unit 32 of the transmission side device (optical disc recording / playback apparatus 11) discriminates the reception side device (television broadcast reception device 12) and the content requiring copy restriction and the copy restriction unnecessary. The flowchart which summarized the processing operation | movement which outputs a content adaptively is shown.

  That is, when the process is started (step S1), the control unit 32 determines whether or not the HPD line 13b is at the H level in step S2, and when it is determined that the HPD line 13b is at the H level (YES). In step S3, the + 5V power line 13a is set to L level, and in step S4, it is determined whether the HPD line 13b has become H level or L level.

  If it is determined in step S4 that the HPD line 13b is at the H level, since the + 5V power line 13a is at the L level and the HPD line 13b is at the H level, the control unit 32 determines in step S5. Then, it is determined that the connected television broadcast receiver 12 is an independent power supply type, and the + 5V power line 13a is set to H level in step S6.

  Thereafter, in step S7, the control unit 32 acquires EDID from the television broadcast receiving apparatus 12, and executes HDCP authentication processing on the television broadcast receiving apparatus 12. Then, the control unit 32 determines whether or not the authentication is established in step S8, and when it is determined that the authentication is established (YES), the content is encrypted and transmitted to the television broadcast receiving device 12 in step S9. Then, the process ends (step S18).

  If it is determined in step S8 that the authentication is not established (NO), the control unit 32 determines in step S10 whether a predetermined time set in advance has elapsed, and determines that it has not elapsed. If so (NO), the process returns to step S7.

  Furthermore, when it is determined in step S10 that the predetermined time has elapsed (YES), the control unit 32 determines whether or not the content to be transmitted is content that requires copy restriction in step S11, and copies the content. If it is determined that the content needs to be restricted (YES), the process returns to step S7.

  If it is determined in step S11 that the content to be transmitted is not content that requires copy restriction (NO), the control unit 32 sends the content to the television broadcast receiving device 12 without encrypting the content in step S12. Then, the process ends (step S18).

  On the other hand, when it is determined in step S4 that the HPD line 13b is at the L level, the HPD line 13b is changed to the L level when the + 5V power line 13a is set to the L level. Thus, it is determined that the connected television broadcast receiver 12 is of the interlock power source type, and the + 5V power line 13a is set to the H level in step S14.

  Thereafter, in step S15, the control unit 32 acquires EDID from the television broadcast receiving apparatus 12, and executes HDCP authentication processing on the television broadcast receiving apparatus 12. And the control part 32 discriminate | determines whether authentication was materialized by step S16.

  If it is determined in step S16 that the authentication is not established (NO), the control unit 32 returns to the process in step S15. If it is determined that the authentication is established (YES), the content is displayed in step S17. Is encrypted and transmitted to the television broadcast receiver 12, and the process ends (step S18).

  According to the embodiment described above, when the optical disc recording / reproducing apparatus 11 changes the level of the + 5V power line 13a, the television broadcast reception is performed depending on whether the level of the HPD line 13b fluctuates following the level change. It is determined whether the device 12 is an interlock power source type or an independent power source type. In this way, it is determined that the power supply is an independent power source, and the HPD line 13b is at the H level, so that the television broadcast receiver 12 is in a power-on state, and the HDCP interface 43 performs the authentication process. It is determined that it can be handled.

  When the HDCP interface 43 is determined to be compatible with authentication processing, the television broadcast receiving device 12 switches to the HDCP system when authentication failure continues for a predetermined time. It is possible to improve the convenience for the user by preventing the authentication process from being continued unnecessarily by making it possible to transmit only content that does not require copy restrictions by determining that it is not compatible. It becomes.

  In the above-described embodiment, the optical disc recording / reproducing apparatus 11 is shown as the transmission side device. However, the present invention is not limited to this, and digitized content including video, audio, and the like after performing authentication with the reception side device. It is possible to broadly target devices that have a function of enabling encryption and transmission.

  Furthermore, in the above-described embodiment, the television broadcast receiving device 12 is shown as the receiving side device. However, the present invention is not limited to this, and a device including a decoding unit corresponding to the copy guard method provided in the transmitting side device, Devices that are not compatible with the copy guard method of the side device can be widely targeted.

  In the above-described embodiment, the use of the HDCP method as the copy guard method has been described. However, the present invention is not limited to this, and whether or not the receiving device is in a power-on state, that is, a state that can handle authentication processing. If it is a system which can discriminate | determine whether it is in the transmission side apparatus, it can make object widely.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by variously modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements according to different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 11 ... Optical disk recording / reproducing apparatus, 12 ... Television broadcast receiver, 13 ... Transmission cable, 13a ... + 5V power line, 13b ... HPD line, 13c ... DDC line, 13d ... TMDS line, 14 ... Antenna, 15 ... Input terminal, DESCRIPTION OF SYMBOLS 16 ... Tuner part, 17 ... PSK demodulation part, 18 ... TS processing part, 19 ... Signal processing part, 20 ... Antenna, 21 ... Input terminal, 22 ... Tuner part, 23 ... OFDM demodulation part, 24 ... Tuner part, 25 ... Analog demodulator, 26 ... Graphic processor, 27 ... Audio processor, 28 ... OSD signal generator, 29 ... Video processor, 30, 31 ... Output terminal, 32 ... Control, 32a ... CPU, 32b ... Memory, 33 ... Operation unit 34 ... Remote controller 35 ... Receiving unit 36 ... Disk drive unit 37 ... Optical disc 38 ... Encryption / Encoding unit, 39 ... encoder, 40 ... HDD, 40a ... hard disk, 41 ... digital transmission / reception unit, 42 ... input / output terminal, 43 ... HDCP interface, 44 ... input terminal, 45 ... output terminal, 46 ... input / output terminal, 47 ... input terminal, 48 ... power supply terminal, 49 ... EDID memory.

Claims (7)

A content transmission device that encrypts and transmits content that requires copy restriction after authentication with the receiving device,
Detecting means for detecting whether or not the receiving device is in a power-on state;
Authentication means for performing authentication processing on the receiving device when the detecting device detects that the receiving device is in a power-on state;
A content transmission apparatus comprising: a transmission unit configured to transmit, without encryption, content that does not require copy restriction to the receiving device when authentication by the authentication unit fails.   2. The content transmitting apparatus according to claim 1, wherein the transmitting unit encrypts and transmits the content requiring copy restriction to the receiving device when authentication is established by the authenticating unit.   2. The content according to claim 1, wherein when the authentication by the authentication unit fails for a predetermined time continuously, the transmission unit transmits the content that does not require copy restriction to the receiving side device without encryption. Transmitter device.   The authentication means, when the detecting means detects that the receiving device is not in a power-on state, continues authentication processing until authentication is established for the receiving device. Item 2. The content transmission device according to Item 1. A content transmission apparatus that encrypts and transmits content that requires copy restriction after authentication based on the HDCP method is established with the receiving device,
When the level of the + 5V power line in the HDCP system is inverted, the detecting means is in a state where the level of the HPD line is not changed, and the level of the HPD line corresponds to the power-on state of the receiving side device. The content transmitting apparatus according to claim 1, wherein the receiving device determines that the receiving device is in a power-on state. A content transmission method for encrypting and transmitting content that requires copy restriction after authentication with the receiving device,
Detecting whether or not the receiving device is powered on;
A step of performing an authentication process on the receiving device when it is detected that the receiving device is powered on;
A content transmission method comprising: a step of transmitting unencrypted content to the receiving device without encryption when authentication fails. A content transmission system in which a transmitting device encrypts and transmits content that requires copy restriction after authentication with a receiving device,
Detection means for causing the transmitting device to detect whether the receiving device is in a power-on state;
An authentication unit for causing the transmission side device to perform an authentication process with the reception side device when the detection unit detects that the reception side device is in a power-on state;
A content transmission system comprising: a transmission unit that causes the transmission-side device to transmit content that does not require copy restriction to the reception-side device without encryption when authentication by the authentication unit fails.

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