JP2009099183A - Apparatus, method and program for processing digital content - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately protect copyrights without hindering reproduction at an output destination when a CD player 15 reads out a music file of MP3 or the like stored in a data CD loaded therein and transmits the digital signal through a digital output terminal 23 to the output destination, such as an MD player 32 or the like. <P>SOLUTION: A sub-Q code is obtained from the loaded disc (S43). It is determined whether the disc is a CD-DA or a data CD based on a second bit value in a control area of the sub-Q code (S44). When the disc is a data CD, a digital signal of a music file read out from the data CD is converted into a PCM format, and further, to a digital signal of an S/PDIF format. The S/PDIF-format digital signal with the copy prohibit bit of the channel status set to a copy first generation is output to the digital output terminal 23 (S49). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital content processing apparatus, method, and program for accurately preventing illegal copying of digital content.

  Patent Document 1 discloses a reproducing apparatus and a recording apparatus compliant with CPS (Copy Protection System) (FIG. 1 of Patent Document 1). The CPS-compliant playback device of Patent Document 1 includes an attribute information addition circuit (FIG. 4 of Patent Document 1), adds attribute information to the digital output signal separately from the copy control information, and outputs the digital signal to the playback device. Is set to “player” and is output to the recording apparatus (paragraph 0055 of Patent Document 1 and FIGS. 3B and 3C). On the other hand, the CPS-compliant recording apparatus disclosed in Patent Document 1 copies the supplied digital signal as long as the attribute information is “player” even if the control information is “Copy Once”. (S4 → S5 → End in the paragraphs 0062 and 0079 of Patent Document 1 and the flowchart of FIG. 7).

  FIG. 6 is a schematic configuration diagram of an audio system 110 equipped with a conventional CD player 115. The amplifier 31 and the MD player 32 in the audio system 110 are the same as the amplifier 31 and the MD player 32 in the audio system 10 according to an embodiment of the present invention, which will be described later. Further, the display unit 18, the operation unit 19, the digital output terminal 23, the left channel analog output terminal 24 and the right channel analog output terminal 25 in the CD player 115 of the audio system 110 are an audio system according to an embodiment of the present invention described later. Since the display unit 18, the operation unit 19, the digital output terminal 23, the left channel analog output terminal 24, and the right channel analog output terminal 25 in the 10 CD players 15 are the same, description thereof is also omitted.

  The system microcomputer 116 obtains the CD-DA (Compact Disc Digital Audio) or data CD lead-in area information chucked by the CD mechanical unit 117 from the CD mechanical unit 117 and sends a control signal to the CD mechanical unit 117. To control output signals from the CD mechanical unit 117 to the digital output terminal 23, the left channel analog output terminal 24, and the right channel analog output terminal 25.

  The signal output from the audio system 110 to the amplifier 31 or the MD player 32 when the CD-DA is chucked to the CD mechanical unit 117 is the same as that of the audio system 10 of the embodiment of the present invention described later. The description is omitted.

  A signal output from the audio system 110 to the amplifier 31 or the MD player 32 when the data CD is chucked by the CD mechanical unit 117 will be described. The music data stored in the data CD is a compressed file format such as MP3 (MPEG Audio Layer-3). Based on the control from the system microcomputer 116, the CD mechanism unit 117 decodes the compressed file format data, generates a digital signal in S / PDIF (Sony Philips Digital Interface) format, and outputs the digital signal to the digital output terminal 23. . In this case, since the source is a music file (audio file) in a compressed file format such as MP3 stored in the data CD, copying in an S / PDIF format digital signal to be output to the digital output terminal 23 is prohibited. The bit is set to the default copy permission.

When the CD mechanism unit 117 outputs a digital signal in S / PDIF format with copy permission to the digital output terminal 23, the MD player 32 to which the digital signal is input from the digital output terminal 23 performs digital copy based on the digital signal. This is a copyright issue. Therefore, in the conventional audio system 110, when the data CD is chucked by the CD mechanism unit 117, the digital output to the digital output terminal 23 is set to mute, that is, silent, and the left channel analog output terminal 24 and To the right channel analog output terminal 25, the left and right analog audio signals related to the music file to be reproduced are output without muting. The amplifier 31 and the MD player 32 output reproduced sound from a speaker (not shown) based on the left and right analog audio signals, or record them on the MD.
JP 2001-351319 A

  The problems of the conventional CD player 115 regarding the reproduction of the music CD music file are as follows.

  (A) Since the output from the digital output terminal 23 is muted, when the data CD is reproduced, the MD player 32 can be used to amplify and output an audio signal such as the amplifier 31. Analog output is also required for such recording equipment. In this case, even if the amplifier 31 is an amplifier capable of digital input, it is necessary to wire an analog signal transmission cable in addition to the digital signal transmission cable between the CD player 115 and the amplifier 31.

  (B) Since the output from the digital output terminal 23 is muted, when a user connects a recording device such as the MD player 32 to the digital output terminal 23 to perform digital recording, silence is directly applied to a recording medium such as an MD. It will be recorded.

  The playback apparatus of Patent Document 1 outputs the digital signal with attribute information to an external recording device by uniformly setting the attribute information in the output digital signal to “player”, that is, recording prohibition, regardless of the type of playback target. Even the operation of recording the music of the CD-DA in the MD or the like for the user himself / herself to be enjoyed is prohibited. In addition, the external recording device needs to support not only control information related to copyright but also attribute information.

  It is an object of the present invention to enable digital content processing in which, at the output destination of a digital signal related to digital content data to be reproduced, reproduction can be performed without any trouble from the digital signal, and recording based on the digital signal can be prohibited. An apparatus, method and program are provided.

  According to the present invention, it is determined whether the digital content data to be reproduced is in the PCM format or the compressed file format. Digitally outputs a playback digital signal with the right management information copied to the first generation.

The digital content processing apparatus of the present invention includes the following.
A discriminating unit for discriminating whether the digital content data to be reproduced is in a PCM format or a compressed file format; and when the discriminating unit discriminates that the digital content data to be reproduced is in a compressed file format, Digital output means for digitally outputting a reproduced digital signal in which the copyright management information in the digital communication standard for outputting content data is copied as the first generation.

The digital content processing method of the present invention comprises the following steps.
If it is determined in the determination step that the digital content data to be reproduced is in a PCM format or a compressed file format, and the determination step determines that the digital content data to be reproduced is in a compressed file format, A digital output step of digitally outputting a reproduction digital signal in which the copyright management information in the digital communication standard for outputting content data is copied as the first generation.

  The program of the present invention causes a computer to function as each means of the digital content processing apparatus of the present invention.

  According to the present invention, it is determined whether the digital content data to be reproduced is in the PCM format or the compressed file format, and if the digital content data to be reproduced is in the compressed file format, the digital communication for outputting the digital content data to be reproduced is output. The copyright management information in the standard is output as the first copy. Therefore, the reproduction of the content based on the digital signal can be performed without any trouble, and the recording of the content based on the digital signal can be disabled.

  FIG. 1 is a schematic configuration diagram of an audio system 10. The audio system 10 includes a CD player 15, an amplifier 31, and an MD player 32. The CD player 15 includes a system microcomputer 16, a CD mechanical unit 17, a display unit 18, and an operation unit 19. Although not shown, the left and right audio signal output terminals of the amplifier 31 are connected to the left and right speakers by cables. Therefore, in the audio system 10, the reproduced sound of the music is output from the left and right speakers.

  The CD mechanical unit 17 is capable of chucking a CD medium such as a CD-DA or a data CD, and based on an instruction from the system microcomputer 16, information related to the CD-DA or data CD being chucked is sent to the system microcomputer 16. And a signal related to the corresponding music in the CD-DA or data CD based on an instruction from the system microcomputer 16 is output to the digital output terminal 23, the left channel analog output terminal 24, and the right channel analog output terminal 25. The operation unit 19 includes a plurality of keys operated by the user, and key operation information is sent from the operation unit 19 to the system microcomputer 16. The system microcomputer 16 sends display information to the display unit 18 based on input signals from the CD mechanical unit 17 and the operation unit 19, and the display unit 18 performs corresponding display based on the display information from the system microcomputer 16.

  The digital output terminal 23 of the CD player 15 is connected to the digital input terminals of the amplifier 31 and the MD player 32. The left channel analog output terminal 24 and the right channel analog output terminal 25 of the CD player 15 are connected to the left and right analog input terminals of the MD player 32. In the audio system 10, unlike the audio system 110 (FIG. 6), the analog signal line between the CD player 15 and the amplifier 31 is omitted. The reason for this is as follows, This is because only the digital signal from the CD player 15 can be used for reproduction without any trouble.

  FIG. 2 is a well-known structure diagram of the sub-Q code. As is well known, the CD-R (Compact Disk Recordable) has a PCA (Power Calibration Area), a PMA (Program Memory Area), a lead-in, a program area, and a lead-out in order from the inner circumference side to the outer circumference side. Each area is arranged. The sub-Q code refers to, for example, the one written in the lead-in area.

  In FIG. 2, the control area (Control) of the sub-Q code has a total of 4 bits, 0-3. If the first bit is “0”, it means that copying is prohibited, and if it is “1”, it means that copying is permitted, and “0” and “1” at 4 to 10 Hz. When it is an alternating (when it appears by alternately repeating “0” and “1”), it means the first copy generation.

  The second bit in the control area of the sub Q code indicates whether the disk storing the sub Q code is a CD-DA or a data CD. If the second bit is “0”, it means CD-DA, and if it is “1”, it means data CD.

  FIG. 3 is a flowchart of the disc-specific digital signal processing method 40. The disc-specific digital signal processing method 40 is implemented in the CD player 15. In S41, it is determined whether or not there is a disk data read (DiscRead) request. If there is such a request, the process proceeds to S42, and if there is no request, the disk-specific digital signal processing method 40 is immediately terminated.

  In S42, it is determined whether or not the disk being chucked is in the CD mechanical unit 17. If the determination is positive, the process proceeds to S43, and if not, the disk-specific digital signal processing method 40 is terminated. In S43, the sub Q code is acquired from the lead-in area of the disk being chucked.

  In S44, it is determined whether or not the second control bit of the sub-Q code acquired in S43 is “1”. If “1”, the process proceeds to S48, and the disk being chucked by the CD mechanical unit 17 is determined to be a data CD. If it is "0", the process proceeds to S52 and is determined to be CD-DA.

  In S49, the digital data of the music file (audio file) read from the data CD is decoded to generate a digital signal in PCM format, and a digital signal in S / PDIF format is generated from the digital signal. In S49, the S / PDIF format channel status copy prohibition bit is set to "0/1" alternating, that is, set to the first copy, and the digital signal of the S / PDIF format after this setting is digitally set. Output to the output terminal 23. On the other hand, in S53, the sub-Q code of the disk is directly used as the value of the corresponding bit in the S / PDIF format and output to the digital output terminal 23.

  On the other hand, when the digital signal that has undergone the processing of S49 in the disc-specific digital signal processing method 40 is supplied from the digital output terminal 23, the MD player 32 stops recording because the copyright information is the first generation copy. To do. In the MD player 32 in the conventional audio system 110 (FIG. 6), since the copyright information is not permitted to be copied but a silent digital signal is sent instead of the copy first generation information, silent recording is performed. On the other hand, since recording is not performed in the MD player 32 in the audio system 10, it is possible to prevent a silent track from being created in the MD.

  Further, in this case, since the amplifier 31 is involved in reproduction, not recording, even if the digital signal subjected to the processing of S49 in the disc-specific digital signal processing method 40 is supplied from the digital output terminal 23, the reproduction processing is performed. Without stopping, the digital signal from the digital output terminal 23 is subjected to predetermined decoding to generate an audio digital signal, and then left and right analog audio signals are generated by digital / analog conversion. The left and right analog audio signals are appropriately amplified and then output to left and right speakers (not shown) to be output as audio.

  In contrast to the conventional CD player 115 (FIG. 6) in which the output of the digital output terminal 23 is muted when the music related to the music file of the data CD is played, the CD player 15 replaces the muting with Since the copyright information is made to be the first copy, it is possible to save the trouble of wiring the analog signal cable in addition to the digital signal cable between the CD player 15 and the amplifier 31. Further, in order to avoid muting of the reproduced sound, it is possible to save the user from switching the input of the amplifier 31 from digital to analog.

  When the amplifier 31 and the MD player 32 are supplied with the digital signal that has undergone the processing of S53 in the disc-specific digital signal processing method 40, the copyright information in the digital signal is stored in the CD mechanism unit 17 that is being chucked. Since it matches the copyright information in the DA sub-Q code, the processing corresponding to the copyright information of the CD-DA is performed. In other words, if the copyright information of the CD-DA is copy permission, the amplifier 31 reproduces the track of the CD-DA, and the MD player 32 copies the track. If the copyright information of the CD-DA is copy prohibited or copy first generation, the amplifier 31 reproduces the track of the CD-DA, and the MD player 32 does not copy the track.

  The disc-specific digital signal processing method implemented in the conventional audio system 110 (FIG. 6) is partially different only in S49. That is, although the S / PDIF format digital signal is generated, the copy prohibition bit of the channel status of the S / PDIF format is not set to the first copy.

  FIG. 4 is a block diagram of the digital content processing apparatus 60. The above-mentioned CD player 15 (FIG. 1) is an example of the digital content processing apparatus 60. The digital content to be processed by the digital content processing device 60 is not limited to audio, and may be video or other. The digital content processing apparatus 60 includes a determination unit 61 and a digital output unit 62. A typical digital output means 62 includes a first conversion means 67, a second conversion means 68, and a copyright management information giving means 69.

  The discriminating means 61 discriminates whether the digital content data to be reproduced is in the PCM format or the compressed file format. When the determining means 61 determines that the digital content data to be reproduced is in a compressed file format, the digital output means 62 sets the copyright management information in the reproduced digital signal related to the digital content data to the first generation copy. The reproduced digital signal is output to the outside.

  For example, the discriminating means 61 determines whether the digital content data to be reproduced is in a PCM format or a compressed file format, and whether the recording medium storing the digital content data is a CD-DA or a data CD. Determine based on the determination. In a further specific example, the discriminating means 61 determines whether the recording medium storing the digital content data to be reproduced is a CD-DA or a data CD, and a control bit of the sub-Q code in the lead-in area of the recording medium. (The second bit value in the control area in FIG. 2).

  Thus, in the digital content processing apparatus 60, for the digital content data in the compressed file format, the copyright management information is set as the first generation copy, and the reproduction digital signal related to the digital content data is output. Equipment that performs playback based on the output performs playback without any problem, and equipment that performs recording based on the output does not perform recording, resulting in copyright protection and recording of empty data. Generation of tracks, recording files, and the like can also be prevented.

  In the digital output means 62, when the digital content data to be reproduced is in a compressed file format, the first conversion means 67 decodes the digital content data and converts it into a PCM format digital signal. The second conversion means 68 converts the PCM format digital signal converted by the first conversion means 67 into a digital signal of the digital communication standard. When the digital content data to be reproduced is in a compressed file format, the copyright management information adding unit 69 converts the digital signal of the digital communication standard after the conversion by the second conversion unit 68 into the copyright management information. Output as the first copy.

  A specific example of the digital communication standard is the S / PDIF format. A device that performs reproduction or recording using the output digital signal of the digital output means 62 may be supplied with the digital signal via a cable or wirelessly.

  FIG. 5 is a flowchart of the digital content processing method 80. The digital content processing method 80 is implemented in the digital content processing apparatus 60. The disc-specific digital signal processing method 40 in FIG. 3 is an example of a digital content processing method 80.

  In S81, it is determined whether the digital content data to be reproduced is in the PCM format or the compressed file format. If the determination is positive, the process proceeds to S82, and if not, the process proceeds to S83. S82 corresponds to S49 of the disc-specific digital signal processing method 40 (FIG. 3). In S82, the copyright management information in the reproduced digital signal related to the digital content data is set to the first copy, and the reproduced digital signal is externally transmitted. And the digital content processing method 80 ends. S83 corresponds to S53 of the disc-specific digital signal processing method 40 (FIG. 3). In S83, the digital content data to be reproduced and in PCM format is output as it is.

  The processes of S81 and S82 correspond to the functions of the determination unit 61 and the digital output unit 62 of the digital content processing apparatus 60 (FIG. 4), respectively. Therefore, the specific modes described for the functions of the discriminating unit 61 and the digital output unit 62 can be applied as the specific modes for the processing of S81 and S82. In the digital content processing method 80, a step of executing processing corresponding to the functions of the first conversion unit 67, the second conversion unit 68, and the copyright management information adding unit 69 of the digital content processing apparatus 60 is added as appropriate. Is possible. The adding step is added as a substep within S82.

  The program to which the present invention is applied causes a computer to function as each unit of the digital content processing apparatus 60. Another program to which the present invention is applied causes a computer to execute each step of the digital content processing method 80.

  This specification discloses various inventions. The invention is not limited to each device and each method described in the section of the best mode of the invention, but one or a plurality of elements that have independent actions and effects are extracted from each device and each method. Or what changed the some element in the obvious range, and also what changed the combination of the 1 or several element between each apparatus and between each method are included.

It is a schematic block diagram of an audio system. It is a well-known structural diagram of a sub-Q code. It is a flowchart of the digital signal processing method according to disk. It is a block diagram of a digital content processing apparatus. It is a flowchart of a digital content processing method. It is a schematic block diagram of the audio system equipped with the conventional CD player.

Explanation of symbols

60: Digital content processing device 61: Discriminating means 62: Digital output means 67: First converting means 68: Second converting means 69: Copyright management information giving means 80: Digital content processing method

Claims (6)

A discriminating unit for discriminating whether the digital content data to be reproduced is in a PCM format or a compressed file format; and when the discriminating unit discriminates that the digital content data to be reproduced is in a compressed file format, Digital output means for digitally outputting a reproduction digital signal in which the copyright management information in the digital communication standard for outputting content data is copied as the first generation;
A digital content processing apparatus comprising:   The determining means determines whether the digital content data to be reproduced is in a PCM format or a compressed file format, and whether the recording medium storing the digital content data is a CD-DA or a data CD. The digital content processing apparatus according to claim 1, wherein the determination is made based on:   The discriminating unit discriminates whether the recording medium storing the digital content data to be reproduced is a CD-DA or a data CD from the value of the control bit of the sub-Q code in the lead-in area of the recording medium. The digital content processing apparatus according to claim 2, wherein:   4. The digital content processing apparatus according to claim 1, wherein the copyright management information in the digital communication standard is copyright management information in a channel status format in the S / PDIF standard. If it is determined in the determination step that the digital content data to be reproduced is in a PCM format or a compressed file format, and the determination step determines that the digital content data to be reproduced is in a compressed file format, A digital output step for digitally outputting a reproduction digital signal obtained by copying the copyright management information in the digital communication standard for outputting content data to the first generation;
A digital content processing method comprising:   A program that causes a computer to function as each unit of the digital content processing apparatus according to claim 1.

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