JPS61158282A - Dubbing preventing device of video signal - Google Patents

Abstract

PURPOSE:To allow only an owner of an IC card to reproduce normal video signals by connecting an IC card incorporating a descrambler to a reproduction display. CONSTITUTION:An IC card 1 incorporating a ROM5 functioning as a descramabler which decodes codes is connected to terminals 11R, 11G, 11B, 12R, 12G and 12 for connection to IC card which are provided to a color TV receiver. The code signals extracted by a code extracting circuit 8 with the pulse of a gate pulse generator 7 are decoded by the ROM5. Then these decoded signals are supplied to terminals 12R, 12G and 12B which supply the video signals given from terminals 11R, 11G and 11B to a color CRT2 after deciding by changeover switches 11R, 11G and 11B whether these video signals should be transmitted or not through inverting circuits 9R, 9G and 9B respectively.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a video signal dubbing prevention device.

[Conventional technology]

As a conventional method for preventing dubbing of video signals, a system in which the video signal is scrambled and sent out so that only a receiving device equipped with a descrambling device can receive normal video has been put into practical use in CATV and the like. This configuration prevents reception by a receiving device not equipped with a descrambling device and dubbing by a video tape recorder.

[Problem that the invention seeks to solve]

However, in the above configuration, the descrambling device on the receiving side is only connected via the input terminal such as the antenna wire of a normal television receiver, and the descrambler
A normal video signal can be obtained by directly inputting the output from M to the video tape recorder, or by connecting it to the video tape recorder via this output terminal if the connected television receiver is equipped with a video signal output terminal. can be recorded, and a recipient equipped with a descrambling device can easily dub it. Furthermore, even if the receiver does not have a descrambling device, once the scrambled signal is decoded, a descrambling device can be created based on it, and from then on all scrambled video signals will be played back normally. There is a problem with dubbing.

Moreover, the above-mentioned dubbing prevention device is mainly used in CATV and the like, and descrambling devices are hardly used in commercially available video soft tapes because they are expensive.

In view of the above-mentioned points, it is an object of the present invention to provide a device for preventing dubbing of video signals that is inexpensive and easily constructed, and which is difficult to dub.

[Means for solving problems]

The video signal dubbing prevention device of the present invention scrambles and records a video signal, and creates an IC card (1) with a built-in descrambler (5) that decodes the scrambled signal. 1) is connected to a playback display (2).

Further, the video signal dubbing prevention device f of the present invention connects an IC card (1) with a built-in descrambler (5) that receives a scrambled signal and decodes the scrambled signal to a playback display. It's a book.

Furthermore, the device for preventing dubbing of Eirin signals of the present invention is an IC cart that scrambles and records a video signal and is connected to a playback display at the same time and has a built-in descrambler (system) that decodes the scrambled signal. It was created by Lee Kei.

[Effect]

Due to the above-mentioned configuration, only the person with the IC card (1) can reproduce normal video, so dubbing is meaningless if the IC card (1) cannot be duplicated, and dubbing of the video signal is not possible. effectively prevent.

〔Example〕

An embodiment of the video signal dubbing prevention device of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 is a diagram showing part of the circuit configuration of a color television receiver, where (3R), (3G), and (3B) are red.
This is an input terminal into which video signals from the three-color output video amplifier of blue and green are input.This input terminal (3R,), (3G
), (3B) for each color using the switch (4R,
), (4G), (4B) one fixed contact (a
), (c) = (e), and the movable contacts of each changeover switch (4R), (4G) = (4B) are connected to one fixed contact (a), (c), (e).
By connecting to the side, the input terminal (3R),
Input signals from (3G) and (3B) are supplied to the cathode of the color cathode ray tube (2). (6) is a synchronization signal input terminal, which supplies the synchronization signal supplied to this synchronization signal input terminal (6) to the deflection circuit (141), and transmits the deflection signal obtained at the output side of this deflection circuit (I41) to the color cathode line. The deflection yoke of the tube (2) is supplied with the deflection yoke of the tube (2).

In this case, in this example, the color television receiver is set to *X like the well-known color television receiver so that it can receive normal color television broadcasts.

In this example, the color television receiver has connection terminals (IIR), (IIG),
(IIB).

(12R), (12G), (12B), (1
31 will be provided. This connection terminal (IIR) = (11G
) and (11B) are terminals (3R) and (3G), respectively.
, (3B) and connecting terminal (12R), (
12G) and (12B) are respective changeover switches (4R
), (4G), (4B) other fixed contact (b
).

(d) and (f), respectively, and the connection terminal 031 is connected to the synchronization signal input terminal (6).

The color television receiver of this example is configured as described above.
Connection terminal (IIR) for connecting each IC card.

(IIG) = (11B> , (12R) , (1
2G), (12B), and (!3) are configured so that a thin IC card (1) can be connected to them.

This IC card (1) has a built-in ROM (F5) that functions as a descrambler for code decoding.
This ROM (Fi) is supplied with a synchronizing signal from the connection terminal (131), and the code is extracted from the signal from the connection terminal (IIG) using the r-tooth pulse generator (7), which is supplied with a synchronizing signal. The code signal extracted by the circuit (8) is supplied, and the code signal is decoded.
Connection terminal (IIR), (IIGl) to which red, green, and blue signals are supplied by the code signal decoded by (F5)
411B) (11B) to the inversion circuit (9R
, ) , (9G) , (9R) or not via the switch (IOR) , (IOG) , (IO
B), -q even Nλ) (= cuff-supplying connection terminal (12ft), (12G)
.

(12B).

Here, the video signal input terminals (3R), (3G),
Normal I(,G,
When B (red, green, blue) video signals (Fig. 2 A) are supplied, selector switches (4R) and (4G) are supplied.
, (4B) is connected to one fixed contact (a),
(C) and (e) are connected to A 1111 so that the video signals of R2O and B from the output video amplifier are directly supplied to the color cathode ray tube (2). In this way, general color television broadcasting can be received. In this case, there is no need for the IC card (1) to be attached.

Next voltage, video signal input terminal (3R), (3G),
When the scrambled video signals (B, C, D in Figure 2) of R, OM (F) are input from (3B), the code signal is decoded with the content that matches the scrambled content. Install the IC card (11) with a built-in IC card (4R), (4G), (4
Switch the movable contact B) to the other fixed contacts (b), (d), and (f) on the IC card (1) side. By doing this, the video signals supplied to the scrambled video signal input terminals (3R), (3G), and (311) are 110 M (5
) for each video signal R, G according to the code signal solved by
, B are inverted every horizontal period, and converted into normal R, G, H video signals and sent to a color cathode ray tube (2
), and images can be normally displayed on the display.

By being configured as described above, no matter how scrambled the video signal is, the IC card (1
) can be handled by incorporating a ROM (5) that performs descrambling according to the scrambled contents. For this reason, for example, scrambled video signals with different content for each type are recorded on a commercially available copyrighted video soft tape (or disc, etc.), and the scrambled video signal of that soft tape is combined with this video soft tape. By selling IC cards (1) according to the content, only the purchaser of the video soft tape can play normal video. Even if you try to dub, unless the color television receiver has a terminal to take out the descrambled R, G, and H video signals, the normal video signal cannot be taken out, and the video tape recorder will not be able to take out the video signal. It is not possible to dub. Even if dubbing is forced, it will only be possible to record a scrambled video signal, and in the end only the IC card holder, ie, the purchaser, will be able to view the normal video. Furthermore, when the dubbing prevention device of the present invention is used in pay television such as CATV, the content of scrambling the video signal is changed depending on the type of channel or program, and the receiver side can select the necessary channels and programs. By distributing only the IC card that performs disc lamping of video signals, it is possible to easily select only the necessary channels and programs. In addition, in order to reduce the portion from which the descrambled video signal can be extracted to the outside, it is possible to connect the IC card (1) immediately before the color cathode ray tube (2). In addition, IC cards can be manufactured more cheaply than mass-produced, and color television receivers are equipped with selector switches (4R), (4G), and (4B), and terminals are provided for IC card plates. Since it only needs to be configured so that it can be installed, this dubbing prevention device costs almost nothing.For example, when used with a commercially available video soft tape, it hardly increases the price of the soft tape, and it does not require much effort on the side of a color television receiver. The manufacturing cost is also almost unchanged. Even when used in pay TV, the expensive descrambling device can be replaced with an IC card, resulting in cost reduction. Furthermore, KIC cards can be made cheap if mass-produced, but it is difficult for individuals to make them, and even if they were possible, they would be more expensive than purchasing video software, and they would have to be made for each type of software. .

In the above embodiments, the present invention has been applied to a color television receiver, but it goes without saying that a display device can be used instead. Further, the present invention is not limited to the above-described embodiments, and it goes without saying that other configurations may be adopted without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, by creating an IC card with a built-in descrambler that can be connected to a color television receiver, the descramble of a scrambled video signal is decoded and an IC card with matching contents is generated. Only the holder can play normal video, it is simple and inexpensive, and has an extremely high dubbing prevention effect, allowing copyright protection.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a video signal dubbing prevention device of the present invention, and FIG. 2 is a diagram for explaining the example in FIG. (1) is an IC card, (2) is a color cathode ray tube, (5)
is a ROM. ρ

Claims (1)

[Claims] 1. An IC card with a built-in descrambler for scrambling and recording a video signal and decoding the scrambled signal is created, and this IC card is connected to a playback display. A video signal dubbing prevention device characterized by: 2. A video signal dubbing prevention device comprising an IC card having a built-in descrambler that receives a scrambled signal and deciphers the scrambled signal, connected to a playback display. 3. Prevention of dubbing of video signals, characterized in that an IC card is created that scrambles and records video signals and is connected to a playback display at the same time and has a built-in descrambler that decodes the scrambled signals. Device.