CN1791919A - System and method for discouraging copying by recurring quantization loss - Google Patents
System and method for discouraging copying by recurring quantization loss Download PDFInfo
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- CN1791919A CN1791919A CNA200480013307XA CN200480013307A CN1791919A CN 1791919 A CN1791919 A CN 1791919A CN A200480013307X A CNA200480013307X A CN A200480013307XA CN 200480013307 A CN200480013307 A CN 200480013307A CN 1791919 A CN1791919 A CN 1791919A
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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
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
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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
- 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
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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
- H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
-
- 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
- H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
- H04N2005/91385—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video frame number being modulated
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- Television Signal Processing For Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
The present invention alters a signal slightly after the decoding step so that the quantization loss is made recurring while not obvious to a human viewer of the decoded signal. The slightly altered signal, when re-encoded, is degraded enough to be annoying, without the measures being perceived in the first decoded signal. The present invention can be applied to a decoded digital signal if sufficient register space is available or to an analog signal after AD conversion.
Description
The present invention relates to prevent to copy the method and apparatus of video or sound signal by the recompile simulating signal.More specifically, the present invention relates to signal is adjusted, this being adjusted in the follow-up signal copy can cause accumulation more significantly to repeat (recurring) quantization loss.The most specifically, the present invention is a kind of like this method and apparatus: to adjusting through the signal of decoding, so that quantization loss constantly repeats and imperceptible quantization loss in the original decoded of signal, but each follow-up copy along with signal, quantization loss reduces the quality of decoded signal cumulatively, so that the quality of signals of recompile is lower than acceptable level.
Have and much prevent method that digital video material is copied.Direct Digital is protected by the Content Scrambling System of use encrypting and be used for DVD (CSS) to digital copies.As long as employed digital rights management (DRM) system is not destroyed, just can effectively protect content.Patented technology comprises those technology of being devoted to prevent by the method for various upset registers the digital to analogy copy, for example, synchronous operation (No. the 4631603rd, the U.S. Patent application of Ryan, its full content is incorporated this paper by reference into) or colour synchronisation operation (No. the 5883959th, the United States Patent (USP) of Kori, its full content is incorporated this paper by reference into).Always, this protection is better relatively for effect concerning the copy of VHS, because record hardware can't overcome it when televisor can overcome this operation scheme.
No. 6295360 (its full content is incorporated this paper by reference into) instruction of people's such as Ryan United States Patent (USP) is to the protection of analog copy, and this protection scheme is not fine to the VGA effect, because a lot of monitor type does not satisfy its requirement.Therefore for PC, the protection scheme of Ryan can't be implemented, and makes PC can copy the VGA signal.If, for example, DVD playing back and be MPEG2 on PC with VGA signal recompile, then quality descends less relatively (see " the Philips National Laboratory technical descriptioon (PhilipsNational Laboratory Technical Note) 427/99 " delivered in March, 2003, its full content is incorporated this paper by reference into).The technology that prevents recompile has been arranged, such as the protection that realizes by digital watermark (seeing that for example, No. the 6314518th, the United States Patent (USP) of Linnartz, its full content is incorporated this paper by reference into).But, in transmission course, embed with to detect the watermark cost relative higher and need extra hardware.In addition, also not at the standard of the watermark of digital video.Therefore, watermark embedding and detection always can be not supported.
The technology of tackling this situation (seeing that for example, No. the 6345099th, the United States Patent (USP) of Alvarez, its full content is incorporated this paper by reference into) has also been arranged.But these technology depend on the cooperation of analog display unit, therefore to the not effect of old device.For these technology, most of existing display device can be regarded old device as.
Another kind of means are instructed in United States Patent (USP) No. 6272283 (its full content is incorporated this paper by reference into) by Nguyen, wherein, if carry out Copy Protection, then only allow content is sent to simulation output.The United States Patent (USP) of Hogan No. 6137952 (its full content is incorporated this paper by reference into) instruction is a kind of to reduce the equipment and the method for quality of the unauthorised copies of coloured image and video sequence.The Hogan instruction is a kind of to change the method that analog output signal causes the quality reduction of unauthorised copies by introduce appreciable balance pseudomorphism in brightness and chromatic component.But, Hogan has instructed at analog filtering and transition period and has introduced pseudomorphism (digital to analogy copy), how not to prevent recompile and compresses (numeral by simulation arrives digital copies) again and have to lecture.
As shown in accompanying drawing 1, by to simulating signal, for example VGA carries out recompile and copies video image, and for example the DVD video image is feasible.The prior art of remedying this situation is ineffective, because they do not contain every kind of possible copy scheme and/or always not supported.The Copy Protection measure is that the video output signals of the DVD ROM driver of PC is taked.Replace the vision signal of DVD driver by the VGA signal that uses personal computer (PC), can evade these measures like a cork.In PC, need to prevent recompile or the VGA quality of signals of recompile be reduced to acceptable measure below horizontal, and these measures must be not only at the digital version of media content, and must include the analog version of media content.
The actual video or the audio content of system and method modulation of the present invention and Analog signals are to be reduced to any quality of signals through recompile below the acceptable degree.When analog video signal is encoded, this signal is sampled, and quantization step becomes to adopt the discrete value of digital form compression and storage with analog signal conversion.When digital signal is decoded, rebuild original analog as well as possiblely.But, reproduction is not perfectly, because have quantification and compression loss at coding side, that is, and the difference between the analogue value of rebuilding after the decoding and the original analogue value.This can't prevent that because say in essence, simulating signal is continuous, and digital signal disperses.However, if resulting simulating signal is carried out recompile, with regard to image quality, copy may approach original numerical coding.This is owing to these actual conditions cause: by suitable selection recompile parameter, quantization loss can not repeat, and is perhaps very limited.
According to the preferred embodiment, system and method for the present invention changes simulating signal slightly after decoding step, constantly repeats to cause quantization loss.Change the decoding simulating signal and approach just balance between the original value by breaking, can the recompile signal degradation is irksome to being enough to, and these measures can not felt by the observer of the simulating signal of decoding for the first time.These measures can be applied to any parameter that for example vision signal is quantized, and such measure comprises that frame frequency modulation, piece move, color and brightness change.
Effect of the present invention does not also rely at the record end or in display end increase measure.In addition, the cost of realization is relatively very little.This is a kind of cooperative simple scheme that does not rely on any other parts of existing system, that is, it does not need to change the other parts of existing system.
Accompanying drawing 1 expression copies the vision signal that process is decoded by VGA being carried out recompile.
Accompanying drawing 2 is illustrated among the PC of embodiments of the invention the position that VGA is adjusted to the vision signal that the decoded video signal by the DVD-ROM output of PC draws.
Accompanying drawing 3 is illustrated in the DVD video recorder (DVD-VR) of embodiments of the invention the position that VGA is adjusted to the vision signal that the VGA signal by the decoded video signal of the DVD-ROM output of PC draws.
Accompanying drawing 4 expressions use two DVD-VR that combine embodiments of the invention that copy is copied.
Accompanying drawing 5 expressions are according to the frame frequency modulation of the output simulating signal of embodiments of the invention.
Accompanying drawing 6 expressions are added to noise frame on the output simulating signal according to embodiments of the invention.
Accompanying drawing 7 expressions are added according to the noise that carries out in numeric field of embodiments of the invention.
Accompanying drawing 8 is illustrated in not the recompile of the sampling under the situation of the measure that the frame frequency with the frame frequency of recompile signal (b) and original signal (a) is complementary.
Accompanying drawing 9 is illustrated in the recompile under the situation of the frame frequency modulation (b) of having carried out original signal (a).
Accompanying drawing 10 is illustrated in brightness noise (b) is added to the recompile that carries out under the situation on the original signal (a).
System and method of the present invention is incorporated into the repetition loss in the video flowing by the frame frequency of the simulation output of modulating video playback system.The modulation that the present invention adopts is very low, is enough to make human brain to be revised them, that is, so they can not noticed that the while is enough to cause the interruption in the tracer signal again by human beholder.
Accompanying drawing 2 and 3 expression copy hardware configuration, these hardware configuration are carrying out revising when realizing method of the present invention, the embodiment that the copy of the VGA signal that to be the present invention obtain the DVD-ROM driver from PC worsens.In accompanying drawing 2, according to the preferred embodiment, Signal Regulation 230 is among the PC and carries out in the position, thereby recurring quantization loss is arranged in outputting VGA signal, and when to VGA-〉when video 210 signals carry out recompile 220 and copy, can cause the obvious reduction of reproduced signal quality.In accompanying drawing 3, according to the preferred embodiment, Signal Regulation also 340 is among the PC and carries out in the position, so that quantization loss is at VGA-〉repeat in video 310 signals, and in DVD video recorder (DVD-VR) 330, carry out the obvious reduction that recompile 320 and copy can cause reproduced signal quality.The process of DVD-VR 400 and 410 duplicate copy is used in accompanying drawing 4 expressions.
As shown in accompanying drawing 5, digital source 510 (for example DVD video file) is input in the demoder 520, this demoder is decoded to content and is calculated the primitive frame of changing 530 one-tenth simulating signals 540.According to the preferred embodiment, some frames are postponed, and with the output ahead of time of some frames.The result is the frame frequency modulation 550 that has realized in the resulting simulation output 560.According to another interchangeable embodiment, the same position place in process 550 can be modulated the tone of sound.
As shown in accompanying drawing 6, digital source 610 (for example DVD video file) is input in the demoder 620, this demoder is decoded to content and is calculated the primitive frame of changing 630 one-tenth simulating signals 640.According to the preferred embodiment, produce 650 noise frames, and with its stack 660 on frame from AD converter so that each output frame 670 has stack its oneself noise frame thereon.According to another interchangeable embodiment, noise frame can be made of the lower limit intensification modulation.
As shown in Figure 7, when the register that is used to store digital frame was enough big, noise added and can carry out in numeric field between AD changes 750, and can add the value that is lower than quantization level 730 this moment.Each output frame 760 has stack noise thereon.
Effect of the present invention when the frame frequency of modulating video signal has been shown in accompanying drawing 8 and 9.In accompanying drawing 8, the frame frequency of the frame frequency of recompile signal 810 and original signal 800 is complementary.According to the preferred embodiment shown in the accompanying drawing 9, timing difference is very small, and the beholder discovers less than this timing difference.The accumulative effect of these fine differences is that the recompile signal is losing synchronous 910 with original signal 900 sometime.On this aspect, re-encoder just needed it and has skipped a frame before next frame can obtain.The beholder can feel that this frame skips.It sensuously is mild that existing coding method all is chosen to frame frequency to make scene to change.Frame frequency modulation of the present invention does not influence this sensation.But, frame is skipped can influence.
Some display system can't show the signal of modulating frame frequency.In order to address this problem, another interchangeable preferred embodiment of the present invention is introduced the repetition loss by random noise is added on the intensity level, wherein the infrahuman threshold of feeling of this noise.The result who increases this random noise shown in Figure 10.The optimal compression scheme has been used the quantization step of approaching human threshold of feeling 1000.If half of value that has added quantization step is more than (that is, half of human threshold of feeling), the beholder will can not notice the difference so.If the copy to this signal carries out recompile, then the quantization loss of Chong Fuing can make this difference can feel 1010.
According to the interchangeable embodiment of another kind, carrier chrominance signal is added random noise, and have similar effects.But, human eye will be much smaller than the sensitivity that brightness is changed to the sensitivity of colouring information.
Another kind of embodiment introduces the repetition loss by the tone of modulation sound.Along with the mankind reach maturity, most people have lost the ability of absolute hearing, mean, they no longer have the ability of the absolute pitch of definite sound, and only can feel acoustic tones with respect to another acoustic tones.The minor alteration of tone, for example 10% of detection threshold, be imperceptible.If the accumulation subtle change carry out gradually, so these the accumulation subtle change up to reach threshold of feeling 100% before can not be felt.Recompile can make quantization loss repeat, thereby any tonal variations all can become and can feel.This is illustrated in table 1.
| (a) | (b) | (c) | (d) | (e) | (f) | |
| 1 | 75.0 | 0.10 | 75.1 | 75.0 | 75.1 | 75.0 |
| 2 | 75.0 | 0.20 | 75.2 | 75.0 | 75.2 | 75.0 |
| 3 | 75.0 | 0.30 | 75.3 | 75.0 | 75.3 | 75.0 |
| 4 | 75.0 | 0.40 | 75.4 | 75.0 | 75.4 | 75.0 |
| 5 | 75.0 | 0.50 | 75.5 | 76.0 | 76.5 | 77.0 |
| 6 | 75.0 | 0.60 | 75.6 | 76.0 | 76.6 | 77.0 |
| 7 | 75.0 | 0.70 | 75.7 | 76.0 | 76.7 | 77.0 |
| 8 | 75.0 | 0.80 | 75.8 | 76.0 | 76.8 | 77.0 |
| 9 | 75.0 | 0.90 | 75.9 | 76.0 | 76.9 | 77.0 |
| 10 | 75.0 | 1.00 | 76.0 | 76.0 | 77.0 | 77.0 |
Table 1
Listed ten samplings in table 1, these samplings have constant tone (a) (supposing to change to 100 from 0), and quantization step is 1, as threshold of feeling.Along with the time goes over, compare 10% (b) of tonal variations threshold value with previous sampling.The output that the result obtains has the tone (c) that gradually changes, and human viewer is what to note less than this variation of tone.When at recompile the time, this output being quantized,, can observe the kick of tone at point sometime.(from 75.0 to 76.0 (d)).If repeat this process (obtaining copy (e) from copy), then beating of tone obtains amplifying, and obtained doubling the tonal variations (75.0 to 77.0 (f)) of threshold of feeling.Repeat recompile, that is, copy is copied repeatedly, then amplified this effect.
According to the interchangeable embodiment of other, the parameter that quantizes is modulated, so that make that actual modulation is imperceptible, and the effect after the recompile can be felt.These embodiment modulate the parameter of quantification, comprise time, color, brightness, tone and position (pixel, piece or picture move).In table 2 and 3, further for example understand this effect.
| (a) | (b) | (c) | (d) | (e) | (f) |
| 90.0629278445819 | 90.0 | 89.4313980987747 | 89.0 | 89.99786288 | 90.0 |
| 13.1726840675944 | 13.0 | 12.5926102903547 | 13.0 | 13.63147732 | 14.0 |
| 36.9200733106677 | 37.0 | 37.7581152182808 | 38.0 | 38.70949927 | 39.0 |
| 11.9555836852979 | 12.0 | 11.0356283704219 | 11.0 | 11.4244593 | 11.0 |
| 52.8042788803264 | 53.0 | 52.0598751550741 | 52.0 | 51.25829538 | 51.0 |
Table 2
In table 2, adopt 1 pair of step-length to change to 100 the analogue value (a) and carried out quantizing (b) from 0.On the simulating signal of being reproduced, having superposeed is lower than the random noise (c) of quantization step (that is threshold of feeling).This makes quantization loss repeat, and noise has been carried out amplifying (d).If copy is copied (e), then this effect obtains repetition, has consequently amplified this effect (f).
| (a) | (b) | (c) | (d) | (e) | (f) |
| 71.3197914243845 | 71.0 | 71.5100000000000 | 72.0 | 72.5100000000000 | 73.0 |
| 47.9533842878958 | 48.0 | 47.4900000000000 | 47.0 | 46.4900000000000 | 46.0 |
| 77.2555565303215 | 77.0 | 77.5100000000000 | 78.0 | 78.5100000000000 | 79.0 |
| 36.9200733106677 | 37.0 | 36.4900000000000 | 36.0 | 35.4900000000000 | 35.0 |
| 62.7278837145204 | 63.0 | 63.5100000000000 | 64.0 | 64.5100000000000 | 65.0 |
Table 3
In table 3, change to 100 the analogue value (a) with 1 pair of step-length from 0 and carried out quantizing (b).On the simulating signal of being reproduced, half the fixed modulation (c) that has superposeed and equaled quantization step (that is threshold of feeling).This makes quantization loss repeat, and has amplified noise (d).If copy is copied (e), then this effect obtains repetition, has consequently amplified this effect (f) once more.
What introduce previously is, method and exemplary apparatus that vision signal is regulated, thereby make original decoded comprise imperceptible pseudomorphism and in each follow-up copy these pseudomorphisms feel more and more obvious.Realize method of the present invention, the a lot of multi-form of this equipment all is fine, and those skilled in the art can expect that all such versions are included among essential idea of the present invention and the scope, and scope of the present invention is more specifically stipulated in appending claims.
Claims (28)
1. handle the method for passing through the input signal of decoding for one kind, comprise step:
Input signal is analyzed;
Select the type of Signal Regulation according to the analysis result of input signal; With
Utilize the Signal Regulation of selection type to change input signal, so that resulting quantization loss repeats.
2. in accordance with the method for claim 1, wherein:
Signal is an analog video signal; With
The type of Signal Regulation is to choose from comprising frame frequency modulation, random noise is added on the intensity level and random noise being added in the group on the chroma level.
3. in accordance with the method for claim 2, wherein Signal Regulation is lower than human threshold of feeling.
4. in accordance with the method for claim 2, wherein Signal Regulation between the 50%-100% of human threshold of feeling.
5. in accordance with the method for claim 1, wherein:
Signal is a simulated audio signal; With
The type of Signal Regulation is the tone that changes sound signal.
6. in accordance with the method for claim 5, wherein Signal Regulation is lower than human threshold of feeling.
7. in accordance with the method for claim 6, wherein Signal Regulation is 10% of a human threshold of feeling.
8. in accordance with the method for claim 1, wherein:
Signal is a digital video signal; With
The type of Signal Regulation is to choose from comprising random noise being added on the intensity level and random noise being added to the group on the chroma level.
9. in accordance with the method for claim 8, wherein Signal Regulation is lower than human threshold of feeling.
10. in accordance with the method for claim 8, wherein Signal Regulation between the 50%-100% of human threshold of feeling.
11. one kind to handling, consequently produce the method for forbidding being made by this vision signal acceptable DVD copy in the normal picture on display through the vision signal of decoding, wherein vision signal has the frame modulation rate, described method comprises that frame frequency is changed an amount makes the vision signal of recompile and raw video signal lose synchronous step on a definite time point, frame wherein can take place skip, this frame is skipped and can be caused unacceptable DVD copy.
12. in accordance with the method for claim 11, wherein change amount is less than human threshold of feeling.
13. one kind to handling, consequently produce the method for forbidding being made by this vision signal acceptable DVD copy in the normal pictures on display through the vision signal of decoding; wherein vision signal has intensity level and chroma level; described method comprises random noise is added to step on one of intensity level and chroma level; the amount of the random noise that is added makes in the vision signal of recompile; this increase has surpassed human threshold of feeling; the sensation to this increase wherein can occur, this sensation to increase can cause unacceptable DVD copy.
14. in accordance with the method for claim 13, wherein recruitment less than human threshold of feeling.
15. wherein modulate between the 50%-100% of human threshold of feeling in accordance with the method for claim 13.
16. one kind to handling, consequently produce the method for forbidding being made by this sound signal the acceptable copy in the normal sound on audio player through the sound signal of decoding, wherein sound signal has at least one tone levels, described method comprises random noise is added to step at least one tone levels, the amount of the random noise that is added makes in the sound signal of recompile, this increase has surpassed human sensation net, the sensation to this increase wherein can occur, this sensation to increase can cause unacceptable audio frequency copy.
17. in accordance with the method for claim 16, wherein change amount is less than human threshold of feeling.
18. in accordance with the method for claim 16, wherein recruitment is 10% of a human threshold of feeling.
19. one kind is incorporated into quantization loss through the equipment in the signal of decoding, comprises being used for signal is adjusted so that the device that quantization loss that the result obtains repeats.
20. according to the described equipment of claim 19, wherein the signal through decoding is a digital video signal, and this device is from being included in intensity level a certain amount of random noise of stack and choosing the group of a certain amount of random noise of chroma level stack.
21. according to the described equipment of claim 20, wherein said amount is lower than human threshold of feeling.
22. according to the described equipment of claim 20, wherein said amount is between the 50%-100% of human threshold of feeling.
23. according to the described equipment of claim 19, wherein the signal through decoding is an analog video signal, and this device is from comprising a certain amount of frame frequency modulation, choosing in intensity level a certain amount of random noise of stack with the group of a certain amount of random noise of chroma level stack.
24. according to the described equipment of claim 23, wherein said amount is lower than human threshold of feeling.
25. according to the described equipment of claim 23, wherein said amount is % between the 50%-100 of human threshold of feeling.
26., be that simulated audio signal and described device are that to change the tone of sound signal a certain amount of wherein through the signal of decoding according to the described equipment of claim 19.
27. according to the described equipment of claim 26, wherein said amount is lower than human threshold of feeling.
28. according to the described equipment of claim 26, wherein said amount is between the 50%-100% of human threshold of feeling.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47145103P | 2003-05-16 | 2003-05-16 | |
| US60/471,451 | 2003-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1791919A true CN1791919A (en) | 2006-06-21 |
Family
ID=33452447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200480013307XA Pending CN1791919A (en) | 2003-05-16 | 2004-05-03 | System and method for discouraging copying by recurring quantization loss |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1627385A2 (en) |
| JP (1) | JP2007510319A (en) |
| KR (1) | KR20060010804A (en) |
| CN (1) | CN1791919A (en) |
| WO (1) | WO2004102951A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4622558B2 (en) * | 2005-02-07 | 2011-02-02 | ソニー株式会社 | Encoding apparatus and method, program, recording medium, and data processing system |
| KR101465148B1 (en) * | 2013-02-28 | 2014-11-26 | 연세대학교 산학협력단 | Apparatus for encoding/decoding video and method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757910A (en) * | 1993-04-06 | 1998-05-26 | Goldstar Co., Ltd. | Apparatus for preventing illegal copying of a digital broadcasting signal |
| JP2982768B2 (en) * | 1997-11-07 | 1999-11-29 | 日本電気株式会社 | Illegal copy prevention method and apparatus |
| US6137952A (en) * | 1998-04-02 | 2000-10-24 | Hewlett-Packard Company | Apparatus and method for degrading the quality of unauthorized copies of color images and video sequences |
| TW538636B (en) * | 2000-09-01 | 2003-06-21 | Matsushita Electric Ind Co Ltd | Reproduction equipment, reproduction equipment specifying equipment, reproduction equipment specifying system and methods and recording media for said equipment and system |
-
2004
- 2004-05-03 EP EP04730893A patent/EP1627385A2/en not_active Withdrawn
- 2004-05-03 WO PCT/IB2004/001591 patent/WO2004102951A2/en not_active Application Discontinuation
- 2004-05-03 CN CNA200480013307XA patent/CN1791919A/en active Pending
- 2004-05-03 KR KR1020057021627A patent/KR20060010804A/en not_active Application Discontinuation
- 2004-05-03 JP JP2006530658A patent/JP2007510319A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007510319A (en) | 2007-04-19 |
| EP1627385A2 (en) | 2006-02-22 |
| KR20060010804A (en) | 2006-02-02 |
| WO2004102951A2 (en) | 2004-11-25 |
| WO2004102951A3 (en) | 2005-03-31 |
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