Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Reexamination Certificate
2001-03-29
2002-08-13
Holder, Regina N. (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
C360S015000, C380S203000, C386S349000
Reexamination Certificate
active
06433946
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method, device, and recording medium for output control and duplication prevention control using, for example, an anti-duplication control signal recorded in a recording medium together with an information signal.
2. Description of Related Art
VTR (Video Tape recording devices) has been popularized in daily life, and many kinds of software which can be played back on a VTR are supplied abundantly. Digital VTR or DVD (Digital Video Disks) playback devices have been available commercially now, and provide images and sound of exceptionally high quality.
On the other hand, there is, however, a problem in that software applications of this great abundance can be copied without restriction, and several methods have already been proposed to inhibit duplication.
For example, though the method is a method which inhibits duplication of an analog video signal not directly, one method to prevent copying uses a difference in the AGC (Automatic Gain Control) system, or in the APC (Automatic Phase Control) system, for example, between the VTR recording device and a monitor receiver for displaying the image.
For example, the method which utilizes the difference in AGC system, in which a VTR performs AGC using a pseudo sync signal inserted in the video signal and a monitor receiver employs a different AGC system not using the pseudo sync signal, is an example of the former, in detail, when an analog video signal is recorded in an original recording medium, a very high level pseudo sync signal is previously inserted as a sync signal for AGC, and the very high level pseudo sync signal is inserted in the video signal to be supplied from a playback VTR to a recording VTR as a sync signal for AGC.
Alternately, the method which utilizes the difference of APC characteristics between a VTR and receiver as in the case that APC in a VTR can follows the color burst signal in a video signal with a short time constant but APC in a receiver follows with a relatively long time constant is an example of the latter, in detail, the phase of the color burst signal of a video signal is previously inverted partially when the analog video signal is recorded in an original recording medium, and the color burst signal having partially inverted phase is outputted as a video signal to be supplied from a playback VTR to a recording VTR.
As the result, the monitor receiver which receives the analog video signal from the playback VTR plays back the image correctly without being affected by the pseudo sync signal in AGC or without desired affection of the partial phase inversion of the color burst signal used for APC.
On the other hand, in a VTR, which is supplied with the analog video signal from the playback VTR into which pseudo sync signals have been inserted or which has been subjected to color burst signal phase inversion control as described herein above, for receiving such analog video signal and for recording the analog video signal in a recording medium, proper gain control or phase control based on the input signal cannot be performed, and so the video signal is not correctly recorded. Even if this signal is played back, therefore, normal picture and sound cannot be obtained.
As described herein above, in the case that involves an analog video signal, the prevention is not a method for directly inhibiting duplication but is a method for viewing an abnormally played back picture which can not viewed normally. Such prevention method is a passive duplication prevention control.
On the other hand, in the case that a digitized information, for example, video signal is involved, an anti-duplication signal or an anti-duplication control signal comprising, for example, a duplication ranking control code, is added as digital data to the video signal and recorded on the recording medium, so as to prevent or control duplication of the image.
FIG. 1
is a basic structural diagram of a duplication apparatus for duplicating digitized information, a digital information played back by the digital playback device
110
is sent to a digital recording device
120
through a digital transmission line
101
, and the digital recording device
101
duplicates the digital information if duplication is permitted and does not duplicate the digital information if duplication is not permitted.
An anti-duplication control information in the form of additional information is recorded in a recording medium
111
placed on the digital playback device
110
in addition to a digital main information. The anti-duplication control information indicates control content such as duplication inhibition, duplication permission, or generation restriction. The digital playback section
113
reads out the information from the recording medium
111
, acquires the anti-duplication control information together with the digital main information, and sends them to the digital recording medium
120
through the digital transmission line
101
.
An anti-duplication control signal detection section
122
of the digital recording device
120
detects the anti-duplication control signal out of the information received from the digital transmission line
101
, and judges the control content. The judgement result is sent to a digital recording section
121
.
If the judgement result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates permission of recording of the digital information inputted through the digital transmission line
101
, then the digital recording section
121
converts the input digital signal to a digital information suitable for recording, and writes it in the recording medium
123
, that is, recording is performed. On the other hand, if the judgement result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates duplication inhibition, then the digital recording section
121
does not perform recording processing of the input digital information.
Further, if the judgement result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates permission of recording of only the first generation, then the digital recording section
121
converts the input digital signal to a digital information suitable for recording, and writes it in the recording medium
123
, that is, recording is performed, and additionally, converts the anti-duplication control signal in the form of additional information to a signal for indicating duplication inhibition (duplication inhibition of next generation), and records it in the recording medium
123
. Therefore, the video signal can not be duplicated further using the recording medium
123
in which the duplicated information is recorded.
As described herein above, in the case of digital connection that the main information signal and anti-duplication control signal added as an additional information are supplied to a recording device in the form of digital signal, because the anti-duplication control signal is contained in the digital data to be transmitted, duplication prevention control such as duplication inhibition is performed consistently in a recording device using the anti-duplication control signal.
In the case of a duplication prevention control method in which the above-mentioned difference in AGC system or the difference in APC characteristics between a VTR and monitor receiver is used, a pseudo sync signal is inserted in the video signal recorded in a recording medium or the phase of color burst signal is inverted partially. In other word, this method involves processing as described herein above on the sync signal portion, hence a video signal which provides a normal image can undesirably duplicated after the sync signal is changed. The duplicated video signal can be duplicated repeatedly.
In the case of a duplication prevention control method utilizing the difference in AGC system or the difference in APC characteristics between a VTR and monitor receiver,
Holder Regina N.
Maioli Jay H.
Sony Corporation
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