JP2010267372A - Apparatus and method for reproducing digital video signal or audio signal - Google Patents

Abstract

【Task】
In the present invention, when copying is permitted only once in broadcasting or the like, the DVD-ROM is recorded after being recorded on a DVD-R disk (recordable once), a DVD-RAM disk (rewritable) or the like.
DVDs owned by general users against pirated discs illegally copied to
-To stop reproduction by a player capable of reproducing each disk of ROM / R / RAM. Another object is to construct a means for correctly reporting the cause of playback stop to the user when playback is prohibited.
[Solution]
When the copy permission information superimposed on the video signal indicates that one-generation copy is permitted and it is determined that the DVD-ROM is a DVD-ROM, reproduction is prohibited, whereby the first-generation copy-permitted video or audio data is DVD-R. / Reproduction of a disc illegally copied to a DVD-ROM after being once recorded in the RAM is prohibited.
[Selection] Figure 1

Description

The present invention relates to a playback apparatus recorded on a medium such as an optical storage medium, and more particularly to a technique that enables copyright protection of a signal recorded on a medium.

A DVD that records an AV signal compressed using MPEG2 has a problem that the AV signal can be copied without deterioration of quality because the AV signal is handled as digital data.

In response to this, as described in Non-Patent Document 1, a digital watermark technique for superimposing information such as permission, prohibition, permission for only one generation, etc. regarding copying so that the user cannot detect it is introduced. The above technique describes a method of performing copy prevention processing on an analog output in accordance with a detected signal.

However, if there is media that permits copying only once for broadcasting, etc., DVD-
After copying to R disc (recordable once), DVD-RO disc to DVD-RO
No consideration is given to copyright protection by restricting playback of each user's player to a pirated disc copied to M.

Nikkei Electronics (1997.2.24 99p-123P)

In the present invention, when copying is permitted only once in broadcasting or the like, the DVD-ROM is recorded after being recorded on a DVD-R disk (recordable once), a DVD-RAM disk (rewritable) or the like.
DVDs owned by general users against pirated discs illegally copied to
-To stop reproduction by a player capable of reproducing each disk of ROM / R / RAM. Another object is to construct a means for correctly reporting the cause of playback stop to the user when playback is prohibited.

Originally, there is no medium that permits copying only once on a DVD-ROM disc. That is, 1
Information that permits copying of only generations should not be detected from video data by a DVD-ROM. If a pirated copy is created after recording on a recordable medium such as a DVD-R / RAM from a broadcast medium that allows copying only once, and then creating a pirated copy
-Despite the ROM, information that permits copying for only one generation is detected from the video data.
Therefore, means for identifying whether it is a DVD-R, DVD-RAM, or DVD-ROM, means for detecting information relating to copying permission superimposed from video data, and information that is a DVD-ROM and allows one-generation copying If a disc is detected, playback of the disc is prohibited, the reason for stopping playback is output, and the above issue is reported by reporting to the user that playback has stopped due to copyright issues, not due to a malfunction. Is achieved.

As described above, according to the present invention, when the copy permission information superimposed on the video signal indicates the 1st generation copy permission and when it is determined to be the DVD-ROM, the 1st generation copy is permitted by prohibiting the reproduction. Video or audio data is recorded on DVD-R / RAM and then DVD-R
Reproduction of discs illegally copied to the OM can be prohibited. In addition, when the reproduction is prohibited, the cause of the reproduction stop can be correctly reported to the user.

1 is a block diagram of a DVD playback apparatus according to a first embodiment of the present invention. The block diagram of the DVD reproducing apparatus which is the 2nd Example of this invention. The block diagram of the DVD reproducing | regenerating apparatus which is the 3rd Example of this invention. The block diagram of the DVD reproducing apparatus which is the 4th Example of this invention.

  A first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a DVD playback apparatus according to an embodiment of the present invention. Reference numeral 101 denotes a DVD-ROM disc or DVD-R disc or DVD-R on which video data or the like is recorded.
It is an AM disc. In the present embodiment, video data or audio data on which duplication permission information is superimposed is recorded on each disc, and the duplication permission information that is superimposed is the original video data. Alternatively, it is assumed that the quality of the audio data cannot be changed without significantly degrading, and that the disc identification code (a code that can be used to identify whether the disc is a reproduction-only disc) is further added to the video data or audio data. . The disc 102 is an optical pickup that detects a signal from the disc 101, 102 is a preamplifier that performs amplification, waveform equalization, etc. on the signal detected by the optical pickup, and 104 is a binarized reproduced signal, bit synchronized, Demodulating means for performing demodulation; 105, a RAM for temporarily storing demodulated reproduction data; 106, error correcting means for performing error correction processing on data demodulated and stored in the RAM 105; 107, a disc together with video data and the like Means for detecting the disc identification code recorded on the disc, 108 means for detecting duplication permission information superimposed from the video data, 109 for disc reproduction stop signal 114 based on the detected identification code and duplication permission information. Error correction means 106 is used when a disc playback stop signal 114 is generated. At the same time destroy the reverse without correcting the data, it generates an uncorrectable flag 118.
110 is message information generating means for generating video data (characters, illustrations, etc.) or an audio signal indicating that playback is impossible, 111 is corrected data stored in 105 or message information from 110 according to a disc playback stop signal. Is a selection means for selecting 1
12 is an output control means for performing timing control for outputting data from the selection circuit 111, 113 is a data output terminal, 115 is an interface with a microcomputer, 121 is 104, 105, 106, 107, 108, 109 110, 111, 112, 114
, 115 is a microcontroller for controlling the signal processing 120 composed of each element.

  Disc playback with this DVD playback device will be described below.

The signal recorded on the disk 101 is converted into an electrical signal by the pickup 102, and then
After amplification and waveform equalization are performed by the preamplifier 103, the demodulating means 104 performs binarization, bit synchronization, and demodulation of the reproduced signal. The demodulated reproduction data is temporarily stored in the RAM 105.
Stored in. Error correction processing is performed on the stored data by the error correction means 106. The corrected reproduction data is sent to the duplication permission information detecting means 108. The copy permission information detecting unit 108 detects the copy permission information superimposed from the reproduction data. The copy permission information indicates which type of data the recorded data is as follows. 1) Duplication allowed 2) Duplication prohibited 3
) Copy permission for only one generation The detected information is sent to the disc reproduction prohibition signal generation means 109. The disc identification code detection means detects the disc identification code added to the video data or audio data, and sends the result to the disc reproduction stop signal generation means 109. The disc identification code identifies 1) a read-only disc and 2) a recordable disc. The disc reproduction prohibition signal generation means 109 activates the disc reproduction stop signal 114 when the duplication permission information is duplication permitted for only one generation and the disc identification code is determined to be a reproduction-only disc. When the disk reproduction stop signal 114 becomes active, the error correction means 106 destroys the reproduction data stored in the RAM and sends a flag indicating that data correction is impossible to the microcontroller 115. When the disc playback stop signal 114 becomes active, the message information generating means 110 generates video or audio message data indicating that playback has been stopped due to a violation of copying permission. The message information may include a contact information (phone number, address, etc.) of a copyright management organization. The message information may be generated by a ROM that stores the generated data. The selection circuit 111 normally selects the reproduction data read from the RAM, and selects the message information from the message information generation means 110 when the disk reproduction stop signal 114 is active.

As described above, according to the present embodiment, a video signal or audio signal for which only one generation from broadcasting is permitted is once recorded on a DVD-RAM or DVD-R and then DVD-R or DVD-R.
It is possible to prohibit reproduction of pirated discs copied to DVD-ROM based on AM.

Also, by outputting a message signal, the user can recognize that it is due to a copyright problem, not a failure of the playback device or a scratch on the disc. Also, by displaying the contact information to the copyright management organization, it is possible to collect information from the user for identifying the pirated creator. In addition, when 116 is a single semiconductor chip, data is also destroyed in the case of a copyright violation. Therefore, even if the microcontroller software is altered and the uncorrectable flag is ignored, the data is Since it is destroyed, it cannot be read. Further, the condition for activating the disc playback stop signal 114 in the disc playback stop signal generating means 109 is determined when the copy permission information is copy permission for only one generation and the disc identification code is determined to be a playback-only disc, or the copy permission information. Reproduction of a DVD-R / RAM that illegally records a copy-prohibited disc can be prevented. Therefore, according to this embodiment, it is possible to provide a reproducing apparatus that can sufficiently protect the copyright.

  A second embodiment of the present invention will be described with reference to the drawings.

  FIG. 2 is a block diagram of a DVD reproducing apparatus according to the second embodiment.

The disc 101 reproduced in this embodiment is a DVD-ROM, DVD-R, or DVD-
It is intended for RAM, of which DVD-RAM / R has a grooved track wobbled. Therefore, the push-pull signal for tracking is modulated by wobble. This wobble is necessary for tracking at the time of recording, and does not exist on a read-only disk.

This embodiment is the same as the first embodiment except for the following three points. 1) Wobble detection means 116
Having established. 2) A push-pull signal terminal is provided in the preamplifier 103, and the wobble detection means 1
The point connected to 16. 3) The disc playback stop signal stop means 109 is the wobble detection means 116.
The disc playback stop signal is activated when the disc identification code detecting means 107 determines that the disc is a reproduction-only disc and the duplication permission information detecting means 108 judges that one-generation duplication is permitted. .

In the present embodiment, the wobble is detected by the wobble detection means 116 simultaneously with the reproduction of data as in the first embodiment. The disc playback stop signal stop unit 109 is a disc when the disc is determined to be a playback-only disc by either the wobble detection unit 116 or the disc identification code detection unit 107, and at the same time the 1st generation duplication is permitted by the duplication license information detection unit 108. The playback stop signal is activated. Therefore, even if the disc identification code is rewritten, reproduction is surely prohibited.

As described above, according to the present embodiment, a video signal or audio signal for which only one generation from broadcasting is permitted is once recorded on a DVD-RAM or DVD-R and then DVD-R or DVD-R.
It is possible to prohibit reproduction of pirated discs copied to DVD-ROM based on AM. In this embodiment, the condition that the disc is a read-only disc is set so that either the wobble is not present or the identification code is a read-only disc, so that the pirated version is surely detected. Embodiment 1 even if the disc is excluded from the determination condition
The same effect can be obtained.

  A third embodiment of the present invention will be described with reference to the drawings.

  FIG. 3 is a block diagram of a DVD reproducing apparatus according to the third embodiment.

This embodiment is the same as the first embodiment except for the following three points. 1) A reflectance identification circuit 117 is provided. 2) Reflector identification circuit 11 provided with a terminal for outputting information on the reflectance of the preamplifier 103
Point connected to 7. 3) A disc reproduction stop signal stop unit 109 is provided with a reflectance identification unit 117,
The disc playback stop signal is activated when the disc is determined to be a reproduction-only disc by either the wobble detection means 116 or the disc identification code detection means 107, and at the same time the copy permission information detection means 108 determines that one-generation duplication is permitted. .

In the present embodiment, as in the second embodiment, data is reproduced, and at the same time, reflectance information is sent from the preamplifier 103 to the reflectance detection means 117, and the reflectance identification means sets a threshold value for the magnitude of the reflectance. Discs above the threshold are identified as read-only discs. The disc reproduction stop signal stop unit 109 is determined as a reproduction-only disc by any one of the reflectivity identification unit 117, the wobble detection unit 116, and the disc identification code detection unit 107, and at the same time, the duplication permission information detection unit 10
When it is determined in step 8 that one-generation duplication is permitted, the disk reproduction stop signal is activated.

Therefore, even if the disc identification code is rewritten, reproduction is surely prohibited. In this embodiment, the condition of being a read-only disk is set to reflectivity, presence / absence of wobble, and identification code is a read-only disk, so that pirated versions are reliably detected. The condition for determining a disk is any one of the three conditions as a determination condition, and the two conditions are satisfied at the same time. If any one of the three conditions is a determination condition, or any one is satisfied, or one condition The same effect as in the first embodiment can be obtained even when the above is used as the determination condition.

  A fourth embodiment of the present invention will be described with reference to the drawings.

  FIG. 4 is a block diagram of a DVD reproducing apparatus according to the fourth embodiment.

In this embodiment, instead of outputting the output of the message information generation means 110 to the selection circuit 111 and inputting the output of the selection circuit 111 to the output control means 112, the message information generation means 11
Except for writing 0 output to the RAM 105 through the RAM write controller 119, it is the same as the third embodiment. In this embodiment, when the disc playback stop signal 114 becomes active, the second data is overwritten on the video data or audio data to be output originally.
As in the embodiment, the output of the message information generation unit 110 is output to the selection circuit 111, and the output of the selection circuit 111 is input to the output control unit 112.

In the first to fourth embodiments, message information to the user is generated in the playback device, but a terminal for outputting the disc playback stop information 114 is provided, and the disc playback stop information 114 is displayed as video data. The same effect can be obtained even if the message information is generated by the device on the sending side and sent to the device, the audio output device, the compressed video data or audio data decompression device, and the like.

101 ... Storage medium, 102 ... Pickup, 103 ... Preamplifier, 104 ... Demodulation means,
105 ... RAM, 106 ... error correcting means, 107 ... disc identification code detecting means, 108
... Copy permission information detecting means, 109 ... disc reproduction stop signal generating means, 110 ... message information generating means, 116 ... wobble detecting means, 117 ... reflectance identification circuit, 119 ... RAM write controller

Claims (15)

A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded Means for reproducing information relating to copying permission superimposed on video data or audio data, means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium, and reproduction of the permission information reproducing means A video data or audio data reproducing device comprising means for stopping reproduction when the information is permitted to be copied once and the identification result indicates a reproduction-only medium. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded And means for reproducing information relating to copying permission superimposed on video data or audio data, means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium, and an error according to the added correction code. If the reproduction information of the error correction means for correcting and the reproduction information of the license information reproduction means is permitted to be copied once and the identification result indicates a reproduction-only medium, reproduction of video data or audio data is impossible. A video data or audio data reproducing apparatus comprising means for destroying reproduced data. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded And means for reproducing information relating to copying permission superimposed on video data or audio data, means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium, and an error according to the added correction code. If the error correction means for correction and the reproduction information of the permission information reproduction means are permitted to be copied once, and the identification result indicates a reproduction-only medium, the video data or audio data that has not been subjected to error correction processing is erroneous. Video data or audio data having means for destroying video data or audio data so that detection of errors and correction of errors is impossible Is an audio data playback device. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded A means for reproducing information relating to the permission of superimposition copying from video data or audio data; a means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium; Playback information is copied
A video data or audio data reproducing device comprising means for stopping reproduction and means for outputting video data or audio data indicating the reason for stopping when the discriminating result indicates a reproduction-only medium. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded In accordance with the added correction code, the means for reproducing the information relating to the permission of the superimposed copy from the video data or the audio data, the means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium When the reproduction information of the error correction means for performing error correction and the permission information reproduction means is permitted to be copied once and the identification result indicates a reproduction-only medium, video data or audio data that has not been subjected to error correction processing is obtained. Means to destroy video or audio data so that errors can be detected and errors cannot be corrected, A video data or audio data reproducing device comprising means for outputting the video data or audio data shown. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded A means for reproducing information relating to the permission of superimposition copying from video data or audio data; a means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium; Playback information is copied
Video data comprising means for stopping reproduction and means for outputting a control signal instructing the output of a video signal or audio signal indicating the reason for stopping when the discriminating result indicates a read-only medium. Or an audio data playback device. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded In accordance with the added correction code, the means for reproducing the information relating to the permission of the superimposed copy from the video data or the audio data, the means for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium When error reproduction means for performing error correction and the reproduction information of the permission information reproduction means are permitted to copy once and the identification result indicates a read-only medium, video data that has not been subjected to error correction processing is detected as an error. Means for destroying video data or audio data so that error correction is possible and impossible,
An apparatus for reproducing video data or audio data, comprising means for outputting a control signal for instructing output of a video signal or an audio signal indicating the reason why reproduction is impossible. Reproduction-only recording of video data or audio data generated by superimposing digitized information regarding copying permission on a digital video or audio signal, and a medium identification code for identifying a reproduction-only medium or recordable medium A reproduction apparatus for reproducing video data or audio data from a medium or a recordable medium, wherein means for reproducing information relating to copying permission superimposed on video data or audio data, means for detecting a medium identification code, A video data or audio data reproducing apparatus comprising means for stopping reproduction when reproduction information of the permission information reproducing means is permitted to be copied once and the medium identification code indicates a reproduction-only medium. Means for reproducing information relating to copying permission superimposed on video data or audio data;
A means for detecting a medium identification code and a means for stopping reproduction when the reproduction information of the permission information reproduction means is one-time copying and the medium identification code indicates a reproduction-only medium, 9. The video data or audio data reproducing apparatus according to claim 8, wherein the video data or audio data reproducing apparatus is integrated with a device. A reproduction apparatus for reproducing video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal and video data or audio data from a reproduction-only medium or a recordable medium. Means for reproducing information relating to copying permission superimposed on video data or audio data, means for detecting the reflectance of the disk,
The means for discriminating whether it is a recordable medium or a read-only medium according to the reflectivity of the disc, and the reproduction information of the permission information reproducing means is one-time copying, and when the determining means indicates a read-only medium, A video data or audio data playback device comprising means for stopping playback. Reproduction-only recording of video data or audio data generated by superimposing digitized information regarding copying permission on a digital video or audio signal, and a medium identification code for identifying a reproduction-only medium or recordable medium A reproducing apparatus for reproducing video data or audio data from a medium or a recordable medium, means for reproducing information relating to copying permission superimposed on the video data or audio data, means for detecting a medium identification code, disc Means for detecting the reflectivity of the disc, means for discriminating whether it is a recordable medium or a read-only medium based on the reflectivity of the disc, and the reproduction information of the permission information reproducing means is one-time copying, and a medium identification code or Video data or audio data provided with means for stopping reproduction when the disc discrimination means indicates a reproduction-only medium Playback device. Recording with reproduction-only media without wobbled grooves or wobbled grooves on which video data or audio data generated by superimposing information on permission of copying on digitized video or audio signals is recorded A playback device for playing back video data or audio data from a recordable medium, means for playing back information relating to copying permission superimposed on the video data or audio data, means for detecting wobbling grooves on the disk, A video data or audio data reproducing apparatus comprising means for stopping reproduction when reproduction information of the permission information reproducing means is one-time copying permitted and the detecting means does not detect a wobbling groove. Video data or audio data generated by superimposing a digitized video signal or audio signal with information relating to copying permission, and a medium identification code for identifying a read-only medium or recordable medium, and wobbled A reproduction apparatus for reproducing video data or audio data from a read-only medium without a groove or a recordable medium having a wobbled groove, and reproduces information relating to copying permission superimposed on the video data or audio data Means for detecting a wobbling groove on the disk, means for detecting a medium identification code, and reproduction information of the permission information reproducing means is one-time copying, and the detecting means is a wobbling groove. Means to stop playback when no media is detected or the media identification code indicates a read-only media A video data or audio data reproducing device. A reproduction method for reproducing video data or audio data from a reproduction-only medium or recordable medium in which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded A process for reproducing information relating to copying permission superimposed on video data or audio data, a process for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium, and the permission information reproducing process. As a result, when it is determined that copying is permitted once and the result of the identification processing is determined to be a reproduction-only medium, a reproduction method of video data or audio data, which performs a process of stopping reproduction. A reproduction apparatus for reproducing video data or audio data from a read-only medium or recordable medium on which video data or audio data generated by superimposing information relating to copying permission on a digitized video signal or audio signal is recorded In accordance with the process for reproducing the information regarding the permission of copying superimposed on the video data or the audio data, the process for identifying whether the medium to be reproduced is a reproduction-only medium or a recordable medium, and an error according to the added correction code. As a result of error correction processing for correction and the above-mentioned license information reproduction processing, it is determined that copying is permitted once, and video data or audio data cannot be reproduced when the result of identification processing is determined to be a read-only medium The video data or audio data is characterized in that it is determined that the reproduction data cannot be corrected at the same time. Playback method.

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