Copy control for a video signal with copyright signals superimposed as predetermined bits in the VBID data of the video signal
a video signal and copyright technology, applied in the field of copy protection of video signals, can solve the problems of little if any deterrent to such unlawful copying, no address, and depriving the originator or distributor of video tapes or video disks of additional sales or rentals
Inactive Publication Date: 2012-12-11
SONY GRP CORP
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AI Technical Summary
Benefits of technology
This method allows for regulated copying, enabling one initial copy while preventing further generations, thus addressing the need for a serial copy management system that balances consumer use with content protection.
Problems solved by technology
In the field of sales or rentals of video tapes and video disks, substantial amounts of revenues will be lost if a user is permitted to make a copy of the video program on a video tape or disk, thereby depriving the originator or distributor of the video tape or video disk of additional sales or rentals.
Even though the unlawful re-recording or dubbing of such video programs may constitute copyright infringement, the threat of prosecution therefor presents little if any deterrent to such unlawful copying.
While there is merit to each of the foregoing proposals, none of them addresses the problem of permitting one copy of the video signal from being made but prohibiting the copy from being copied further.
But if a video signal is prohibited from being copied, even a single generation copy cannot be made.
That is, prior proposals have not considered what is referred to herein as a serial copy management system (SCMS).
Method used
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Embodiment Construction
[0045]Referring to FIG. 1, there is illustrated a portion of each of two fields of a frame of video signals in accordance with the NTSC standard. It is appreciated that each field is divided into an effective picture portion which contains useful picture information, such as line intervals 21, 22, etc. in the first field and line intervals 284, 285, etc. in the second field. Each field interval also includes a non-picture portion which is shown as the vertical blanking period and includes line intervals 1, 2, . . . 19, 20 in the first field and line intervals 264, 265, . . . 282, 283 in the second field. It is recognized that the twentieth line in the first field, i.e. line 20, normally is “blank” and the twentieth line of the second field, i.e. line 283, also normally is blank. In the embodiment illustrated in FIG. 1, a copyright information signal S1 is superposed in line 20 of the first field and a copy generation signal S2 is superposed in line 283 of the second field. That is, ...
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A video signal is processed to selectively permit copying by superposing in that portion of the video signal which does not contain useful picture information a copyright information signal indicative of whether the viewable picture that is displayed from the video signal is subject to copyright and a copy generation signal indicative of the number of successive generations of copies that can be made from the video signal.
Description
[0001]This is a divisional of U.S. application Ser. No. 08 / 220,049, filed Mar. 30, 1994 abandoned.[0002]Notice: More than one reissue application has been filed for the reissue of U.S. Pat. No. 5,991,500. The reissue applications are Ser. No. 09 / 978,610, the instant continuation application and application Ser. No. 12 / 894,247. BACKGROUND OF THE INVENTION[0003]This invention relates to copy protection of a video signal and, more particularly, to a technique for superposing on that portion of the video signal which does not contain useful picture information copy protection information which includes information representing the number of successive generations of copies that can be made from the video signal.[0004]Various techniques and formats have been proposed to prevent video signals from being copied, or dubbed, without authorization. For example, it is preferable in many environments to permit a video signal to be displayed as a video picture on, for example, a television monit...
Claims
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IPC IPC(8): H04N9/80H04N5/91G11B20/00H04N5/76H04N5/913H04N5/92H04N7/083H04N7/087H04N7/088
CPCG06F21/10G11B20/00086G11B20/00746G11B20/00768H04N5/913H04N5/9206H04N2005/91321H04N2005/91328H04N5/91
InventorKANOTA, KEIJIEZAKI, TADASHIKORI, TERUHIKOTSUCHIYA, SATOSHI
OwnerSONY GRP CORP