KR19990069673A - Copy protection release device of recording equipment - Google Patents
Copy protection release device of recording equipment Download PDFInfo
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- KR19990069673A KR19990069673A KR1019980004064A KR19980004064A KR19990069673A KR 19990069673 A KR19990069673 A KR 19990069673A KR 1019980004064 A KR1019980004064 A KR 1019980004064A KR 19980004064 A KR19980004064 A KR 19980004064A KR 19990069673 A KR19990069673 A KR 19990069673A
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- copy protection
- video
- sync
- decoder
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/00398—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in sync patterns
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
- G11B20/00818—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals
- G11B20/00826—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals wherein a spoiler signal is added to degrade the signal quality
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/02—Analogue recording or reproducing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91314—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
Abstract
개시된 녹화기기의 복사방지 해제장치는 녹화시에 비디오 SYNC 신호 및 수직 블랭킹 신호를 이용하여 복사를 방지하는 복사방지 펄스 신호를 오프(OFF)시키고 복사방지 펄스가 없는 신호로 출력시키는 복사방지 해제장치에 관한 것이다.The copy protection releasing device of the disclosed recording device is a copy protection releasing device that turns off a copy protection pulse signal that prevents copying by using a video SYNC signal and a vertical blanking signal during recording, and outputs a signal without a copy protection pulse. It is about.
본 발명은 오디오 및 비디오 신호를 분리하여 디코딩하는 A/V 디코더와, A/V 디코더로 분리된 비디오 신호를 인코딩하여 복사방지 신호가 포함된 R/G/B 신호 및 복사방지 SYNC 신호를 출력하는 비디오 인코딩부와, A/V 디코더 및 비디오 인코딩부를 제어하는 제어부와, 비디오 인코딩부에서 출력된 비디오 SYNC 신호를 수신하여 복사방지해제 SYNC 신호 및 수직 블랭킹 신호를 출력하는 SYNC 신호생성부와, SYNC 신호생성부에서 수직 블랭킹 신호가 출력되면 복사방지용 신호 단자에서 복사방지해제용 신호 단자로 절환되는 방지해제 스위치부로 구성된다.The present invention provides an A / V decoder that separates and decodes an audio and video signal, and encodes a video signal separated by an A / V decoder to output an R / G / B signal and a copy protection SYNC signal including a copy protection signal. A control unit controlling the video encoding unit, the A / V decoder and the video encoding unit, a SYNC signal generation unit receiving the video SYNC signal output from the video encoding unit and outputting a copy protection release SYNC signal and a vertical blanking signal, and a SYNC signal When the vertical blanking signal is output from the generation unit, the anti-blocking switch unit is switched from the copy protection signal terminal to the copy protection release signal terminal.
따라서, 녹화시에 방지해제 스위치부에 의해서 복사방지 펄스가 없는 신호를 출력시킴으로써, 사용자는 복사방지 코드가 걸린 모든 아날로그 테이프 및 광디스크의 기록매체를 자유롭게 복사를 할 수 있는 효과를 얻는다.Therefore, by outputting a signal without a copy protection pulse by the protection release switch section at the time of recording, the user can freely copy the recording media of all the analog tapes and optical disks having the copy protection code.
Description
본 발명은 녹화기기의 복사방지 해제장치에 관한 것이다.The present invention relates to an apparatus for releasing copy protection of a recording apparatus.
보다 상세하게는 녹화시에 비디오 SYNC 신호 및 수직 블랭킹(BLANKING) 신호를 이용하여 복사를 방지하는 복사방지 펄스 신호를 오프(OFF)시키고 복사방지 펄스가 없는 신호로 출력시키는 녹화기기의 복사방지 해제장치에 관한 것이다.More specifically, the copy protection releasing device of a recording device that uses a video SYNC signal and a vertical blanking signal to turn off a copy protection pulse signal that prevents copying and outputs a signal without a copy protection pulse during recording. It is about.
최근에는 정보가 기록된 아날로그 테이프 또는 광디스크 기록매체를 녹화기기를 이용하여 다른 기록매체로 복사할려고 할 때, 복사를 할 수 없도록 복사방지기능이 기록매체에 저장되어 있다.Recently, when copying an analog tape or optical disk recording medium on which information has been recorded to another recording medium using a recording device, a copy protection function is stored on the recording medium so that copying is not possible.
도 1은 종래의 녹화기기의 복사방지에 관한 블록선도이다.1 is a block diagram of copy protection of a conventional recording apparatus.
오디오 및 비디오 신호를 분리하여 디코딩(DECODING)하는 A/V 디코더(11)와, A/V 디코더(11)로 분리된 비디오 신호를 인코딩하여 복사방지 신호가 포함된 R/G/B 신호 및 복사방지 SYNC신호(P)를 출력하는 비디오 인코딩부(12)와, A/V 디코더(11) 및 비디오 인코딩부(12)를 제어하는 제어부(13)로 구성되어 있다.A / V decoder 11 that separates and decodes audio and video signals, and R / G / B signal and copy that contain copy protection signal by encoding video signal separated by A / V decoder 11 And a control unit 13 for controlling the A / V decoder 11 and the video encoding unit 12 for outputting the prevention SYNC signal P. FIG.
도 2에 따라 복사방지에 관한 원리를 설명하면, R/G/B 화상 신호에는 복사방지를 위한 AGC(Automatic Gain Control) 펄스신호가 포함되어 있으며, AGC 펄스신호는 수직 블랭킹 신호의 12 라인에서 19 라인에 해당되는 범위내에서 동작하며, 또한, 비디오 인코딩부(12)에서 출력되는 SYNC 신호에도 복사방지를 위한 복사방지용 SYNC 신호가 포함되어 있으며, 역시 수직 블랭킹 신호의 12 라인에서 19 라인에 해당되는 범위내에서 동작한다.Referring to the principle of copy protection according to Fig. 2, the R / G / B image signal includes an AGC (Automatic Gain Control) pulse signal for copy protection, and the AGC pulse signal is displayed on the 12 lines of the vertical blanking signal. It operates within the range corresponding to the line, and the SYNC signal output from the video encoding unit 12 also includes a copy protection SYNC signal for copy protection, and also corresponds to 12 to 19 lines of the vertical blanking signal. Operate within range.
상기 AGC 펄스신호와 복사방지 SYNC 신호는 수직 블랭킹 구간에 포함되어 있고, 이 신호에 의해서 복사가 정상적으로 되지 못하게 한다. 즉, 상기 AGC 펄스신호는 비디오 신호 중에는 가장 큰 신호로서, 만약에 사용자에 의해서 복사 신호가 입력되면 수직 블랭킹 신호의 12 라인에서 19 라인에 동작하는 복사방지 SYNC 신호가 R/G/B 신호에 포함된 AGC 펄스신호는 커지고, 이에 따라 오히려 R/G/B 신호는 작아져서 바록 녹화는 되더라도 재생을 하면 정상화면이 나타나지 않고 이상화면이 표시된다.The AGC pulse signal and the copy protection SYNC signal are included in the vertical blanking interval, thereby preventing the radiation from being normal. That is, the AGC pulse signal is the largest signal among the video signals, and if the copy signal is input by the user, the copy protection SYNC signal operating in 12 to 19 lines of the vertical blanking signal is included in the R / G / B signal. As a result, the AGC pulse signal becomes larger, and accordingly, the R / G / B signal becomes smaller so that the normal picture does not appear and the abnormal picture is displayed even when the recording is performed.
즉, 종래에는 복사방지 기능이 포함된 아날로그 테이프나 광디스크에서는 사용자가 기록매체에 저장된 정보를 복사하고 싶어도 복사가 불가능하였다.That is, conventionally, an analog tape or an optical disk with a copy protection function is not possible even if a user wants to copy information stored on a recording medium.
따라서 본 발명은 상술한 것과 같은 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 녹화시에 복사를 방지하는 복사방지 펄스 신호를 비디오 SYNC 신호 및 수직 블랭킹 신호를 이용하여 복사방지 부분을 해제시키는 녹화기기의 복사방지 해제장치를 제공함에 있다.Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a recording device for releasing the copy protection portion using a video SYNC signal and a vertical blanking signal to the copy protection pulse signal to prevent copying at the time of recording. To provide a copy protection release device of.
도 1은 종래의 녹화기기의 복사방지 장치에 관한 블록선도,1 is a block diagram of a copy protection device of a conventional recording apparatus;
도 2는 종래의 녹화기기의 복사방지 장치에 나타나는 출력신호,2 is an output signal appearing in the copy protection device of a conventional recording apparatus,
도 3은 본 발명에 따른 녹화기기의 복사방지 해제장치에 관한 블록선도,3 is a block diagram of a copy protection releasing device of a recording apparatus according to the present invention;
도 4는 본 발명에 따른 녹화기기의 복사방지 해제장치에 나타나는 출력신호,4 is an output signal appearing in the copy protection release device of the recording apparatus according to the present invention,
도 5는 본 발명에 따른 다른 녹화기기의 복사방지 해제장치에 관한 블록선도이다.5 is a block diagram of a copy protection releasing device of another recording apparatus according to the present invention.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
111 : A/V 디코더 112 : 비디오 인코딩부111: A / V decoder 112: video encoding section
113 : 제어부 114 : SYNC 신호생성부113: control unit 114: SYNC signal generation unit
115 : 방지해제 스위치부115: anti-release switch
전술한 목적을 달성하기 위한 본 발명에 따른 녹화기기의 복사방지 해제장치는 오디오 및 비디오 신호를 분리하여 디코딩하는 A/V 디코더와, A/V 디코더로 분리된 비디오 신호를 인코딩하여 복사방지 신호가 포함된 R/G/B 신호 및 복사방지 SYNC 신호를 출력하는 비디오 인코딩부와, A/V 디코더 및 비디오 인코딩부를 제어하는 제어부와, 비디오 인코딩부에서 출력된 비디오 SYNC 신호를 수신하여 복사방지해제 SYNC 신호 및 수직 블랭킹 신호를 출력하는 SYNC 신호생성부와, SYNC 신호생성부에서 수직 블랭킹 신호가 출력되면 복사방지용 신호 단자에서 복사방지해제용 신호 단자로 절환되는 방지해제 스위치부로 구성되는 것을 특징으로 한다.The apparatus for releasing copy protection of a recording apparatus according to the present invention for achieving the above object includes an A / V decoder for separating and decoding audio and video signals, and a copy protection signal for encoding a video signal separated by an A / V decoder. A video encoding unit for outputting an included R / G / B signal and a copy protection SYNC signal, a control unit for controlling an A / V decoder and a video encoding unit, a video SYNC signal output from the video encoding unit, and a copy protection release SYNC. SYNC signal generation unit for outputting the signal and the vertical blanking signal, and when the vertical blanking signal is output from the SYNC signal generation unit characterized in that the anti-blocking switch unit is switched from the copy protection signal terminal to the copy protection release signal terminal.
이하, 본 발명에 따른 녹화기기의 복사방지 해제장치의 바람직한 하나의 실시예를 첨부된 도면들을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of a copy protection releasing device of a recording apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
도 3은 본 발명에 따른 녹화기기의 복사방지 해제장치를 구현하기 위한 블록선도이다.3 is a block diagram for implementing a copy protection release device of a recording apparatus according to the present invention.
오디오 및 비디오 신호를 분리하여 디코딩하는 A/V 디코더(111)와, A/V 디코더(111)로 분리된 비디오 신호를 인코딩하여 복사방지 신호가 포함된 R/G/B 신호 및 복사방지 SYNC 신호(P)를 출력하는 비디오 인코딩부(112)와, A/V 디코더(111) 및 비디오 인코딩부(112)를 제어하는 제어부(113)와, 비디오 인코딩부(112)에서 출력된 비디오 SYNC 신호를 수신하여 방지해제 SYNC 신호(P') 및 수직 블랭킹 신호(V)를 출력하는 SYNC 신호생성부(114)와, SYNC 신호생성부(114)에서 수직 블랭킹 신호(V)가 출력되면 복사방지용 신호 단자에서 복사방지해제용 신호 단자로 절환되는 방지해제 스위치부(115)로 구성되어 있다.An A / V decoder 111 for separating and decoding audio and video signals, and an R / G / B signal and a copy protection SYNC signal including a copy protection signal by encoding the video signal separated by the A / V decoder 111. A video encoding unit 112 for outputting (P), a control unit 113 for controlling the A / V decoder 111 and the video encoding unit 112, and a video SYNC signal output from the video encoding unit 112. SYNC signal generator 114 for receiving and releasing anti-blocking SYNC signal P 'and vertical blanking signal V, and if the vertical blanking signal V is output from SYNC signal generator 114, copy protection signal terminal. Is composed of an anti-release switch unit 115 is switched to the anti-copy protection signal terminal.
또한, 상기 방지해제 스위치부(115)는 상기 SYNC 신호생성부(114)에서 수직 블랭킹 신호(V)가 출력되면 복사방지 SYNC 신호(P)에서 복사방지해제 SYNC 신호(P')로 절환되는 SYNC 스위치(116)와, 복사방지용 R/G/B 신호에서 복사방지 신호가 없는 R/G/B 신호로 절환되는 RGB 스위치부(117)로 구성되어 있다.In addition, when the vertical blanking signal V is output from the SYNC signal generator 114, the anti-blocking switch unit 115 switches the SYNC signal from the anti-copy SYNC signal P to the anti-copy SYNC signal P ′. The switch 116 and the RGB switch part 117 switch from the copy protection R / G / B signal to the R / G / B signal without a copy protection signal.
상기와 같이 구성된 본 발명의 녹화기기의 복사방지 해제장치를 상세히 설명하면 다음과 같다.Referring to the copy protection release device of the recording device of the present invention configured as described above in detail.
도 3 및 도 4에 도시된 바와 같이 사용자가 복사를 하기 위하여 복사방지 해제모드를 입력하면 제어부(113)는 해제모드 신호를 입력하여 A/V 디코더(111)에 의해 수직 블랭킹신호(V)와, 비디오 인코딩부(112)에 의해 비디오 SYNC 신호를 출력시켜 SYNC 신호생성부(114)로 전송한다.3 and 4, when the user inputs the copy protection release mode for copying, the control unit 113 inputs the release mode signal to the vertical blanking signal V by the A / V decoder 111. The video encoding unit 112 outputs the video SYNC signal to the SYNC signal generation unit 114.
SYNC 신호생성부(114)는 다시 수직 블랭킹신호(V)를 출력시키면서 이 수직 블랭킹신호(V)가 입력되면 SYNC 스위치(116)에서는 복사방지 처리된 SYNC 신호(P)가 오프(OFF)되고, 복사방지가 해제된 SYNC 신호(P')로 접속된다.When the vertical blanking signal V is input while the SYNC signal generator 114 outputs the vertical blanking signal V again, the SYNC switch 116 turns off the copy-protected SYNC signal P. It is connected to the SYNC signal P 'whose copy protection is released.
동시에 RGB 스위치부(117)에서도 복사방지 처리된 R, G, B 신호가 오프되고, 복사방지가 해제된 R', G', B' 신호로 스위치가 절환되어 각 출력단자에는 정상적인 녹화가 된다.At the same time, the R, G, and B signals that are copy-protected in the RGB switch unit 117 are turned off, and the switches are switched to the R ', G', and B 'signals where copy protection is canceled, thereby making normal recording on each output terminal.
또한, 상기의 RGB 스위치부(117)에서는 수직 블랭킹신호(V)가 입력되면 R, G 및 B 신호가 복사방지 처리된 R, G, B 신호에서 동시에 복사방지가 해제된 R', G', B' 신호로 절환되는 것으로 한다.In addition, when the vertical blanking signal V is input in the RGB switch unit 117, R ', G', and R ', G', where copy protection is simultaneously released from R, G, and B signals that are copy-protected. It is assumed that the signal is switched to the B 'signal.
즉, 도 4의 (A)에 나타낸 출력신호는 복사방지가 처리된 R, G, B 신호이고, 도 4의 (B)에 나타낸 출력신호는 복사방지가 처리된 SYNC 신호(P)이고, 도 4의 (C)에 나타낸 출력신호는 복사방지를 해제하는 범위가 포함된 수직 블랭킹 신호(V)이고, 도 4의 (A')에 나타낸 출력신호는 복사방지가 해제된 R', G', B' 신호이고, 도 4의 (B')에 나타낸 출력신호는 복사방지가 해제된 SYNC 신호(P')이다.That is, the output signal shown in Fig. 4A is an R, G, B signal which has been subjected to copy protection, and the output signal shown in Fig. 4B is a SYNC signal P having been subjected to copy protection. The output signal shown in (C) of 4 is a vertical blanking signal (V) including a range for releasing copy protection, and the output signal shown in (A ') of FIG. It is a B 'signal, and the output signal shown in (B') of FIG. 4 is a SYNC signal P 'with copy protection released.
또한, 도 5는 도 3에서와 같이 비디오 인코딩부(112)에서 비디오 SYNC 신호를 출력하여 SYNC 신호생성부(114)로 전달하는 SYNC 신호생성부(114)를 갖지않는 복사방지 해제장치에 관한 블록선도이다.In addition, FIG. 5 is a block of a copy protection releasing device having no SYNC signal generator 114 for outputting a video SYNC signal from the video encoder 112 to the SYNC signal generator 114 as shown in FIG. 3. Is leading.
도 5에 도시된 바와 같이 A/V 디코더(211)는 비디오 인코딩부(212)로 데이터 및 SYNC 신호를 전달하고, 상기의 전달되는 SYNC 신호에서 병렬로 검출하여 복사방지 해제된 SYNC 신호로 사용한다.As shown in FIG. 5, the A / V decoder 211 transfers data and SYNC signals to the video encoding unit 212, and detects the SYNC signals in parallel and uses them as copy-protected SYNC signals. .
또한, A/V 디코더(211)에서 수직 블랭킹 신호를 바로 출력하고, 이 수직 블랭킹 신호는 방지해제 스위치부(215)의 복사방지 해제를 위한 절환 스위치의 입력신호로 사용된다. 다른 설명은 도 3에 나타낸 블록선도와 동일하다.In addition, the A / V decoder 211 directly outputs a vertical blanking signal, and the vertical blanking signal is used as an input signal of a switching switch for releasing copy protection of the release protection switch 215. Other explanation is the same as the block diagram shown in FIG.
상술한 바와 같이 본 발명에 따른 녹화기기의 복사방지 해제장치에 의하면, 녹화시에 복사를 방지하는 복사방지 펄스 신호를 비디오 SYNC 신호 및 수직 블랭킹 신호를 이용하여 복사방지 해제신호를 출력시킴으로써, 사용자는 복사방지 코드가 걸린 모든 기록매체를 자유롭게 복사를 할 수 있는 효과를 얻는다.As described above, according to the copy protection releasing device of the recording apparatus according to the present invention, by copying the copy protection pulse signal that prevents copying during recording using the video SYNC signal and the vertical blanking signal, the user It is possible to freely copy all the recording media having the copy protection code.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980004064A KR19990069673A (en) | 1998-02-11 | 1998-02-11 | Copy protection release device of recording equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980004064A KR19990069673A (en) | 1998-02-11 | 1998-02-11 | Copy protection release device of recording equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990069673A true KR19990069673A (en) | 1999-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019980004064A KR19990069673A (en) | 1998-02-11 | 1998-02-11 | Copy protection release device of recording equipment |
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| Country | Link |
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| KR (1) | KR19990069673A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009025727A1 (en) * | 2007-08-22 | 2009-02-26 | Macrovision Corporation | Method and apparatus for synthesizing a copy protection or content control signal with improved playability of a tv set |
-
1998
- 1998-02-11 KR KR1019980004064A patent/KR19990069673A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009025727A1 (en) * | 2007-08-22 | 2009-02-26 | Macrovision Corporation | Method and apparatus for synthesizing a copy protection or content control signal with improved playability of a tv set |
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