CN1151673C - Multimedia adaptive scrambling system (MASS) - Google Patents
Multimedia adaptive scrambling system (MASS) Download PDFInfo
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- CN1151673C CN1151673C CNB998063851A CN99806385A CN1151673C CN 1151673 C CN1151673 C CN 1151673C CN B998063851 A CNB998063851 A CN B998063851A CN 99806385 A CN99806385 A CN 99806385A CN 1151673 C CN1151673 C CN 1151673C
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- scrambling
- order bit
- low
- descrambling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
- H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
- H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
- H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/60—Digital content management, e.g. content distribution
Abstract
A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable, or otherwise provided at a desired quality level. The samples may be in any conceivable compressed or uncompressed digital format, including Pulse Code Modulation (PCM) samples, samples in floating point representation, samples in companding schemes (e.g., mu -law and A-law), and other compressed bit streams. The quality level may be associated with a particular signal to noise ratio, or quality level that is determined by objective and/or subjective tests, for example. A number of LSBs can be scrambled in successive samples in successive frames (FRAME A, FRAME B, FRAME C). Moreover, the parameters for scrambling may change from frame to frame. Furthermore, all or part of the scrambling key (310) can be embedded (340) in the scrambled data and recovered at a decoder (400, 600) to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.
Description
Related application
The U.S. Provisional Application No.60/082 that the application's request was submitted on April 21st, 1998,488 rights and interests.
Technical field
The present invention relates to be used for numeral sample to for example multi-medium data such as audio frequency or the samples of video data discernible a kind of method and apparatus that carries out scrambling so that the content of sample degrades.For example the present invention is applicable to digital broadcast data stream and such as compact disk (CD) and digital video disk digital storage medias such as (DVD).Selected as the sample of scrambling is degraded but still can to discern in each sample by the low-order bit of scrambling (LBSs) number.
Background technology
The communication of numerical data and storage scheme, digital audio, video and other data in the particularly vast consumption market communicate by letter and storage scheme popularize to increase constantly.Consumer is now sending, is receiving, is storing and handling other data contents such as Digital Television, audio frequency and for example computer game and other software, stock market data, meteorological data.Can expect, integrated along with phone, TV and computer network resources, this trend also will continue.
Yet, wish to control or to monitor the use of these numerical datas in many cases.Especially, copyright owner and other property rights beneficiary have the right to control their works, comprise spreading and using of audio frequency, video and writing.
In the copyright management system of need protection an audio frequency and a video content, may wish to provide data scrambling to prevent that these contents are stolen when transmitting.What the distance that transmits had may grow to half earth, as the transmission on the internet; What have may have only several millimeters, transfers to DAC (digital to analog converter) as the internal data in the DVD player from CD.
May be desirable to provide a kind of method and apparatus, make that the audio/video content no longer is suitable for listen/looking, but still be enough to identify an audio/video paragraph, for example when drilling in F.F. when having insufficient time to when putting the sample descrambling.
May wish and to come some bit scrambles in each frame in succession of sample flow to digital data according to a scrambling key that wherein, the scrambling key is to be embedded in the signal of scrambling.
May wish that scrambling key and scrambled data combine, thereby can easily change the scrambling key not revising to drill under the situation of drilling the machine of putting (for example DVD player or CD player) of putting data.
May wish to make data scrambling to have enough quality decline in it so that no longer have any tangible commercial value, just be enough to again simultaneously and can put the perception of machine function institute for drilling such as prompting and F.F. etc.
The data of scrambling must be drilled at any video or audio frequency and drill the damage that can not cause video or audiofrequency apparatus when putting in the place system.Some at random the waveform of scrambling may cause the damage of loud speaker for example or circuit.
The data that also may wish scrambling can be any possible numerical datas.
May wish to carry out the scrambling of data at any time, these times for example comprise when generating data-signal (as the record stage in an audio frequency mark road), during the propagation data signal (as broadcasting in, or in the manufacturing process of medium such as compact disk), and drill when putting data (showing when putting) as the machine of putting of drilling in user family.
The present invention will provide a kind of system with above-mentioned advantage and other advantages.
Summary of the invention
According to an aspect of the present invention, provide a kind of and be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample; To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein the selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern.
According to a further aspect in the invention, provide a kind of and be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample; To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein the selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern; And in described scrambling step, adopt respectively scrambling in scrambling between sample and the sample to these low-order bit carry out between the different samples with same sample in scrambling.
According to another aspect of the invention, provide a kind of and be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample; To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein: the selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern; And in described scrambling step, adopt scrambling between horizontal samples has an equal weight by exchange bit that selected low-order bit is carried out scrambling between different samples.
According to another aspect of the invention, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling is provided, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample; To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein the selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
According to another aspect of the invention, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling is provided, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample; To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein the selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern; And in above-mentioned descrambling step, adopt between sample respectively and sample in descrambling to selected low-order bit carry out between the different samples with same sample in descrambling.
According to another aspect of the invention, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling is provided, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps: the dynamic range of determining each sample; And choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample; To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein the selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern; And in above-mentioned descrambling step, adopt descrambling between horizontal samples to have the bit of equal weight to come selected low-order bit is carried out descrambling between the different samples by exchange.
According to another aspect of the invention, provide a kind of and be not subjected to the illegal equipment that uses by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, this equipment comprises: a range detector/mask maker is used for determining the dynamic range of each sample and chooses some low-order bit that this sample is wanted scrambling according to the dynamic range of each sample; A scrambler is used for keeping some high order bits in each sample simultaneously, thereby corresponding scrambling sample being provided according to the selected low-order bit scrambling of a scrambling key to each sample; Wherein the selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
According to another aspect of the invention, a kind of equipment that is used for the content numeral sample of former scrambling is carried out descrambling is provided, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, this equipment comprises: a range detector/mask maker is used for determining the dynamic range of each sample and chooses some low-order bit that this sample is wanted scrambling according to the dynamic range of each sample; A descrambler is used for keeping some high order bits in each sample simultaneously, thereby corresponding descrambled samples being provided according to the selected low-order bit descrambling of a scrambling key to each sample; Wherein the selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
Description of drawings
Adaptive bit to the data sample in succession in some successive data frame changes according to the present invention in Fig. 1 explanation.
Fig. 2 (a) illustrates according to scrambling in the sample of the present invention.
Fig. 2 (b) illustrates original not scrambling sample.
Fig. 2 (c) illustrates sample situation after the scrambling between process is according to horizontal samples of the present invention of Fig. 2 (b).
Fig. 3 illustrates according to a data scrambler of the present invention and scrambling key coding device.
Fig. 4 illustrates according to a data descrambler of the present invention and scrambling key decoder.
Fig. 5 at length illustrates according to a data scrambler of the present invention.
Fig. 6 at length illustrates according to a data descrambler of the present invention.
The adaptive bit change that Fig. 7 explanation is carried out with fixing minimum dynamic range the data sample in succession in some successive data frame according to the present invention.
Embodiment
The present invention relates to be used for the numeral sample of multi-medium data is carried out a kind of method and apparatus of scrambling.
This theme of being discussed in following each patent and the patent application can be utilized by the present invention, these patents and patent application all are incorporated herein by reference: title is: the U.S. Patent No. 5 of " Method andApparatus for Transporting Auxiliary Data in Audio Signals (being used for transmitting in sound signal the method and apparatus of auxiliary data) ", 822,360; The title of submitting on December 6th, 1996 is the U.S. Patent application No.08/764 of " Method and Apparatus for EmbeddingAuxiliary Data in a Primary Data Signal (being used for auxiliary data is embedded into the method and apparatus of an original data signal) ", 096; Title is the US Patent No of " Post Compression Hidden Data Transport (transmission of back compression hiding data) ", 5,687,191; The title of submitting on August 18th, 1997 is the U.S. Patent application No.08/912 of " PostCompression Hidden Data Transport for Video (transmission of compression hiding data behind the video) ", 434; Title is the U.S. Patent No. 5,719,937 of " Multi_Media CopyManagement Syatem (multimedia copy management system) "; The title of submitting on November 25th, 1997 is the U.S. Patent application No.08/977 of " Multi_Media Copy ManagementSystem (multimedia copy management system) ", 719; And the title submitted is the patent application No.09/708 of " Digital Hidden Data Transport (transmission of digital hiding data) ", 810 on November 8th, 2000.Being used to provide other similar systems of embedding information also to can be the present invention utilizes.
The purpose of audio frequency, video or other digital contents being carried out scrambling is to reduce its quality, but still can allow audience, spectators or other User Recognition go out this content.
To the selectivity scrambling of content waveform comprise keep some high order bits (up to and comprise sign bit) and scrambling remainder low-order bit (LSBs) in some or all bits.With respect to initial data (for example audio frequency, video or other data), interference noise is maintained on the level of a hope.
The M of each a data sample high order bit (MSB) is dynamically kept.Number M can be selected as parameter preset before handling beginning, also can change in processing procedure.
As shown in Figure 1, the dynamic reservation of MSBs relates to carries out the amplitude range detection to each sample, and keeps (or coverage) its M MSBs in the amplitude range of sample.The M value can be from the 0 whole dynamic ranges that change to numeral sample.
M is the bit number that keeps in the dynamic range of each sample, and can change (for example frame by frame change) in processing procedure.And as below discussing, M can be a part that is embedded in the information in the content material of using for decoder.
The sample of digital content can have any possible compression or non-compressed word format, comprising pulse-code modulation (PCM) sample, floating point representation sample, compression expansion scheme (as μ-rule and A-rule) sample, and following various other compression bit stream.
Existing most of audio frequencies, video or image compression system trends towards utilizing frequency domain technique to reduce and is compressed the perception redundant information in the signal.Therefore, most of compression bit streams can be analyzed and be decoded into one group of parameter, and this group parameter has comprised a class frequency sample or a conversion coefficient.Its example has: TDAC conversion coefficient in inferior frequency band sample, AC-3 or the AAC audio coding in the MPEG audio coding and the DCT coefficient in JPEG and mpeg image and the video coding.These expressions can be referred to as " frequency samples ".
In a general compression scheme, the unpressed sample of signal of a group is by the representative of a group frequency samples, and in order to store and transmit these frequency samples effectively, they are quantized according to perceptual criteria.Normally fixing for the ratio of required frequency samples number of the sample of signal that can represent some and above-mentioned sample of signal number, for example be 1.But in fact, owing to usually do not send some to the unessential frequency samples of perception.So the frequency samples number that is selected to send may lack.This can determine by the bit distribution information that extraction is contained in the compression bit stream.
The frequency samples that is not sent out is assigned with the zero bit usually, perhaps represents (for example indicating the length of a series of null values) with zero bit value.In essence, can utilize a dynamic range that has indicated the bit number that is distributed, frequency samples or frequency samples is returned to the additional information of the required scale factor of its total length value, from compression bit stream, extract the binary representation of frequency samples.
In case extracted the binary representation of frequency samples, the processing that the processing of part scrambling will be carried out with the uncompressed domain sample of signal under for example PCM is represented does not have any difference.
Fig. 1 explanation according to the present invention to some adaptive bit changes of the data sample in succession in the data in succession.
Sample carries out optionally scrambling to digital data, and some high order bits (MSBs) are kept, and remaining some or all data bits (as LSBs) are then by scrambling.In addition, the key that uses during descrambling data can be hidden in the scrambled signals (for example adopting each patent quoted from previously and the technology described in the patent application), makes that this key no longer can be decoded after content-data is by descrambling.
In Fig. 1, trunnion axis representative frame and digital data samples in succession.Three frames (frame A, frame B and frame C) have been shown in this example, and each frame contains 15 samples, and each sample has 24 bits, and certainly, the present invention can be adapted to any variation of these parameters.The dynamic range of each sample is between zero bit and 24 bits, and this dynamic range is defined by the non-zero bit of highest order, but does not comprise the sign bit that may appear at each sample high order end.
The dynamic range of original waveform 110 representatives each sample before carrying out scrambling according to the present invention.The bit that is not modified in each sample is represented in zone 120 and 125, and the bit that can carry out scrambling in each sample according to the present invention is then represented in zone 130.
For example, first sample 115 of frame A has the dynamic range of 18 bits, and one of this sample may example be:
0
230
220
210
200
190
181
170
160
151
141
130
120
110
101
91
80
70
60
51
41
30
20
10
0
Subscript is wherein represented the bit position, from the bit 0[0 of lowest order
0] to most significant bit 17 (1
17).
As crossed over shown in the zone 125 of frame A, B, C, the number of not changing (for example keeping) high order bit of each frame can change frame by frame.For example, there be M=2 high order bit not change, have M=3 high order bit not change, have M=2 high order bit not change for frame C for frame B for frame A.Therefore the bit number of not changing of each frame is can be adaptive.Specifically, the number of not changing bit can be inversely proportional to the maximum dynamic range of a frame.For example, for frame A, maximum dynamic range is 22 bits, M=2; And for frame B, maximum dynamic range only is 15 bits, and M=3.
Also might be in order simply the M of each frame to be set at constant.
In general, can come to select this bit number by experiment, make the data that produce have the level that degrades of hope.
Bit in the zone 130 will will be discussed below in more detail by scrambling.
From perception, the sample of selectivity scrambling can present noise.For example, show sound reproduction frequently during sample, sound and to have noise when the machine of putting of drilling in user family.Though along with the dynamic range of each sample and adjacent sample, drill the different of audio frequency type, site environment and other factors of putting, also can be different to the sensation of noise, in general, the MSB that sample keeps
SFewer, sound that noise is the more.
Usually, noise can overslaugh not drilled the function such as for example prompting and F.F. etc. of the machine of putting.Drill when putting when falling back fast (or) in F.F., drill the machine of putting and have insufficient time to descrambled samples.Normally drilling when putting, drill the machine of putting and have sufficient time to descrambled samples, make and can hear or see content with whole dynamic ranges.
According to the present invention, not that whole dynamic ranges of content are carried out scrambling, but kept a part of dynamic range, make the quality of content descend but still can be identified, for example drill when putting and can be identified in F.F..This makes the user can allow audio frequency or video content F.F. easily, to find interested paragraph exactly.
In addition, the content material of selectivity scrambling will limit the amplitude of scrambling waveform to such an extent that be no more than the dynamic range of original waveform.Such scrambling waveform will be with the scrambling waveform be different at random, shows that it can not damage video or audiofrequency apparatus yet when putting even drill place system at any video or audio frequency.
The scrambling of data bit can be carried out (scrambling in the sample) in each sample inside, also can carry out (scrambling between sample) in a group sample.And, also can adopt the combination of scrambling between interior scrambling of sample and sample.
The form of scrambling can be the position (scrambling between sample) of intercoursing data bit, utilizes from a sequence of scrambling key or the derivation of part scrambling key and removes to cover data bit (scrambling in the sample), or their combination.Its objective is the statistical property randomization or the albefaction that make the scrambled data bit, allow them " seem " more at random.Descrambler must be able to make this bit mapping recover former state.
At random or pseudorandom scrambling improved the fail safe of scrambled data because this scrambling will make the more difficult key bit string figure that detects of effractor from scrambled data.
Fig. 2 (a) illustrates according to scrambling in the sample of the present invention.Original sample 200 contains 8 bit S1
7S1
6S1
5S1
4S1
3S1
2S1
1S1
0, wherein " S1 " representative " sample 1 ".For simply, shown sample only contains 8 bits, though each sample can have the bit of arbitrary number.In addition, suppose M=3, this means that three high order bits (are S1
7S1
6S1
5) do not change, but remaining bit (is S1
4S1
3S1
2S1
1S1
0) will change.Suppose S1
7It is the highest order of this sample.After having passed through the interior scrambling of sample, the sample 250 after can obtaining changing, the bit that it contains is S1
7S1
6S1
5S1
0S1
2S1
4S1
3S1
1The bit that can adopt any known signal scrambling technique to obtain changing.
Fig. 2 (b) illustrates the sample of three former beginning and end scramblings.The element of similar code name is in correspondence with each other in each accompanying drawing.Show sample 1 (200), sample 2 (260) and sample 3 (270).Fig. 2 (c) illustrates Fig. 2 (b) sample process according to the sample after the scrambling between sample of the present invention.(260 '), sample 3 (270 ') correspond respectively to sample 1 (200), sample 2 (260), sample 3 (270) for sample 1 (200 '), sample 2.
For scrambling between sample, each waveform sample is grouped into some frames.Each frame all with a scrambling key, for example pseudo-random key is associated.The scrambling key of each frame can be different, determined when decoding.Scrambling useful especially situation is horizontal scrambling between sample, wherein exchanges each and have the bit of same bits weight between each sample.
For example, use bit S1
0Permutated bit S3
0, use bit S1
1Permutated bit S3
1, use bit S1
2Permutated bit S2
2Or the like.
Be noted that and also might adopt non-horizontal scrambling, wherein the bit weightings of scrambling bit no longer remains unchanged.
Fig. 3 illustrates according to a data scrambler of the present invention and scrambling key coding device.In a kind of possible embodiment, the scrambling key is embedded in the audio contents of scrambling.
Adopt a significant advantage of part scrambling sample to be, all or part of of key that is used for descrambled samples can be hidden within the scrambling sample self.Since no matter before descrambling still after, the scrambling key has all obtained protection, so the part scrambling is important.
Scrambler/encoder 300 contains a scrambling key generator 310, is used to produce the scrambling key.
The length of scrambling key is not necessarily identical with sample length, and long scrambling key can make data safer.
The scrambling key is provided for a cipher key cache device 320, and the latter will store for example key of a frame.Like this, the key that is used for the scrambling present frame is introduced when former frame.Through the time-delay an of frame (or a few frame), key is provided for scrambler, is used for the sample with original waveform is carried out scrambling, discusses in conjunction with Fig. 2 (a) to (c) as the front.In general, same scrambling key can be used for the many samples in frame of scrambling.
The waveform of scrambling is provided for scrambling key coding device 340, with the scrambling key coding in waveform, provide thus and contain the scrambling waveform that embeds the scrambling key.For example, adopt the technology described in aforementioned each United States Patent (USP) and the patent application, can become auxiliary data in the waveform to the scrambling key coding.
The scrambled content institute that the scrambling key is similar to noise is hidden.
Fig. 4 illustrates according to a data descrambler of the present invention and scrambling key decoder.Descrambler/decoder 400 contains a scrambling key decoder 410, and it for example receives the scrambling waveform from scrambler/encoder 300 of Fig. 3.The scrambling waveform can obtain through communication by any communication port, and/or obtains from for example medium regeneration.
Scrambling key decoder 410 will make the scrambling key restore, and it is deposited in the cipher key cache device 420, and this scrambling key was used for originally to next frame scrambling.Scrambling key decoder 410 adopts corresponding to the 340 employed technical works of scrambling key coding device.
The scrambling key is extracted from buffer 420, uses during for the sample of descrambler 430 in the descrambling present frame, to produce the waveform of descrambling.For audiovisual, possibly the descrambling waveform is done a subsequent treatment, for example digital-to-analogue conversion for the user.
Advantage here is, because the scrambling key is by descrambler 430 scramblings, so even for the invador who has scrambling key decoder 410, also no longer can recover the scrambling key.
Fig. 5 at length shows one according to data scrambler of the present invention.In scrambler 500, some successive sample that respectively contain W bit (specimen width) are provided for sample frame buffer 510 or 510 '.Utilize a linear address generator 515 that the buffer memory sample of not scrambling is exported from sample frame buffer 510, carry out scrambling according to the scrambling key for a scrambler 330.
A scrambling address generator 525 receives the scrambling key and produces the address in view of the above, makes sample frame buffer 510 ' according to the buffer memory sample of such address with a frame of pseudorandom order output.These buffer memory samples in an AND gate 530 same LSB mask Bit String (the LSB-mask, LSB-MASK) bit-by-bit ground phase " with ", to produce the low-order bit (LSB that will exchange mutually with other samples in the present frame
S).The LSB-mask is such Bit String, and " 1 " wherein is corresponding to the low-order bit of wanting scrambling in the buffer memory sample, and " 0 " is corresponding to other bits in the buffer memory sample.
Range detection device and mask generator 535 provide LSB-mask and MSB-mask (MSB-MASK), and the latter also is a Bit String, indicates the high order bit that will keep (i.e. not scrambling)." 1 " in the MSB-mask Bit String corresponding to the high order bit that will keep in the buffer memory sample, " 0 " is corresponding to other bits.
The MSB-mask in AND gate 540 with from the buffer memory sample bit-by-bit ground phase of sample frame buffer 510 " with ", the high order bit that generation will keep.
From the scrambling sample of scrambler 330 in an AND gate 545 same MSB-MASK/ (MSB-MASK " non-") and LSB-MASK/ (MSB-MASK " non-") phase " with ".MSB-MASK/ and LSB-MASK/ are produced by inverter 550 and 555 respectively.AND gate 545 output that contains the intermediate bit of some scramblings is provided for an OR-gate 560 by bit, with the high order bit that keeps with a frame in the low-order bit that exchanged of other samples combine.
The output of OR-gate 560 is exactly the scrambling sample, and it can be provided for scrambling key coding device 340, and the latter will provide the scrambling sample that has embedded the scrambling key.At this moment, these samples just can send or store on the medium by network, perhaps supply other application.
By a scrambling key coding device (for example 340 among Fig. 3) is set, can be embedded in the scrambling key in the scrambling sample.The embedding that is noted that the scrambling key can be chosen wantonly.
As shown in Figure 5, (result of this scrambling for example can make the paragraph of music still can be identified completely to a kind of method of the audio data of scrambling selectively, but concerning Music Appreciation, lost commercial value) be to keep the sign bit of each sample and for example two most significant bits.All to survey its amplitude range to each sample.Produce a mask for each sample corresponding to the amplitude range of this specific sample.Following expression illustrates to mend sample and the corresponding mask that 2 gestalts change into 16 bits with two examples:
| Sample value is (16 system) for example | Sample value is (binary system) for example | To sign bit and 2 MSB SMask (16 system) (MSB-MASK) | To sign bit and 2 MSB SMask (2 system) (MSB-MASK) |
| 0×0b1f | 0000101100011111 | 0×fc00 | 1111110000000000 |
| 0×ff98 | 111111110011000 | 0×ffe0 | 1111111111100000 |
Each sample all has 16 bits, wherein leftmost bit is-symbol bit (sign bit).For example, for 1111111110011000 sample value under 0 * ff98 or the binary system under 16 systems, bit 15 (" 1 ") shows that this is a negative ,-97 in well negative 0 * 61 or 10 systems.Like this, dynamic range is 7 bits (bit 0 is to bits 6).
In an embodiment of scrambler 500, remaining bit is divided into two groups: the bit of lowest order and all the other all bits.By switch in a frame, significant bits is by scrambling flatly.Also can adopt the interframe scrambling.In addition Yu Xia bit by with the nonequivalence operation of individual Bit String by scrambling, this Bit String is according to all or part of generation of scrambling key.Can utilize a linear shift register to come to change this Bit String for each sample.
Scrambling output is made up of following three parts: the 1) high order bit of Bao Liuing, 2) the interposition bit of the interior scrambling of sample, and 3) low-order bit of scrambling between horizontal samples.
Fig. 6 at length illustrates according to data de-scrambling device 600 of the present invention.This descrambler can be used for handling the data that for example receive from scrambler 500.
Unit 610,510 ", 515 ', 530 ', 535 ', 540 ', 545 ', 550 ' 555 ' and the 560 ' unit 510,510 ', 515,530,53 5,540,545,550,555 and 560 that correspond respectively among Fig. 5.
As shown in Figure 6, scrambling key decoder 410 decodes the scrambling key and it is offered buffer 420 from the scrambling sample, and then offers descrambler 430.If be necessary, can use a linear address generator 515 ', to provide the address, for each sample that receives recovers the Bit String figure to sample frame buffer 610.
The scrambling sample that receives is offered range detection/mask generator 535 ' from sample frame buffer 610.The same with the scrambler situation, utilize amplitude range to survey and identify the high order bit that is retained in each sample.Combined with the high order bit that keeps and the low-order bit of rearrangement in OR-gate 560 ' by the interposition bit of descrambling in each sample.
The contrary MSB mask (MSB-MASK/) of inverter 550 ' output is provided for an AND gate 545 ', with the descrambled samples phase " with ".The output of AND gate 545 ' is provided for OR-gate 560 ', with the low-order bit of reservation high order bit in this frame and rearrangement mutually " or ".
Rearrangement low-order bit in frame is by LSB-MASK is provided according to the address that is produced by a descrambling address generator 625 with the phase of the buffer memory sample of rearrangement " or " obtain, the latter then is by sample frame buffer 510 ".
At the output of AND gate 530 ', the low-order bit position in frame is restored, thereby OR-gate 560 ' will provide descrambling output to the combination of three compositions.
Fig. 7 illustrates the adaptive bit change of the data sample in succession in some successive data frame being carried out with fixing minimum dynamic range according to the present invention.
The reservation dynamic range of high order bit can be fixed as for example 16 bits.The high order bit number N that keeps can be before handling as a parameter preset be fixed (N value can from 0 whole dynamic range) to numeral sample.N=8 in an example shown.
Original waveform 110 has shown the scrambling dynamic range of each sample before.The bit that is not modified in each sample is represented in zone 720, and zone 730 is then represented can be by the bit of scrambling in each sample.For example, for frame A, bit 15 in each sample (corresponding to dynamic range 16) and more high-order bit are not modified, and 14 then are modified from bit 0 to bit.For frame B and frame C, all be modified up to all bits of dynamic range of each sample.
An advantage of this scheme is not need to determine the dynamic range of each sample in encoder.
Implement when of the present invention, following listed various other variation and enhancings can be arranged.
1) referring to Fig. 7, the high order bit number (N) that wherein for example will keep can dynamically change frame by frame.
2), can stride frame of video ground and carry out scrambling for Video Applications.
3) amplitude range detector and mask generator (as the functor among the functor among Fig. 5 535 and Fig. 6 650) can be look-up tables with heuristic rule.
4) length of scrambled frame can change.
5) horizontal scrambling can be carried out the low-order bit of any number.
6) scrambling key all or part of can be hidden in the same frame of content, in the former frame or in any other frame.Obtainable buffer memory space and throughput delay requirement are depended in its enforcement.
7) noiseless, quiet or any other special paragraph can not done scrambling.In other words, scrambling can be continuous, also can be discontinuous.
8) can be hidden in the another kind of data flow (as the audio-frequency unit of same DVD dish) of same content for all or part of scrambling key of a kind of data flow in the content (as the video section of DVD dish).
9) all or part of scrambling key can be hidden in any part of same medium (dish) with any form or mode.For example, for CD or the such physical medium of DVD, key can the electronics mode be hidden in the partition data, perhaps utilizes such as the such technology of hole spot width modulation and hides with physics mode.
10) all or part of scrambling key for a kind of data flow in the content can be hidden in any medium that separate, and for example is hidden in the card that needs pay in advance.Key also can be a kind of product that carries out Trading Authorization by phone, internet or any other means of communication.
11) scrambling can carried out (for example carrying out between preceding left passage in logical acoustics more than and the right passage) between the two or several passages of same data flow.
12) a plurality of passages of the data flow of same content (for example the preceding left passage in the multichannel acoustics and back right passage) can shared same scrambling key, also available different key.
13) scrambling (for example to a preceding left side and preceding right passage scrambling, but misaligning centre, a back left side, the right side, back and inferior bass channel scrambling) of channel selecting can be arranged to a multi-channel data stream.
14) the both available nonlinear shift register of scrambling key, also available nonlinear feedback shift register produces.
15) for the content of compressed format with the supplementary (as bit distribution information) of packed data stream encryption, can simplify range detection and handle.But for some frequency samples, the bit that may not be assigned to enough numbers is distinguished sign bit, high order bit and interposition bit clearly.If there is not the interposition bit, then the part scrambling can be to skip this frequency samples simply.Also can adopt with the illustrated every other operation of uncompressed domain part scrambling.
After the part scrambling, must repack the frequency samples of change, with consistent with original bitstream format.In most of the cases, do not need re-quantization, only need repack.Employed compress technique is depended in this processing.Some compression scheme as the Huffman coding, may need elongated degree coding, so if the size of compression bit stream must remain unchanged, will take special means.Most of compression schemes will produce elongated degree bit stream naturally, and common follow-up transmission bitstream format will adapt to the variation of bit stream size.
Adopt an attendant advantages of part signal scrambling technique of the present invention to be to compression bit stream, the motor synchronizing in the decoder will be easy slightly.This is because of the frame structure in the compression bit stream format or comprises that structure can make decoder more easily determine the border of scrambled frame.
Like this, can see, the invention provides a kind of numeral sample (comprising audio frequency and samples of video data) that is used for multi-medium data and carry out scrambling, make the content of sample degrade but still can discern, perhaps reach the system of the quality level of hope.Quality level for example can be associated with a certain specific signal to noise ratio, perhaps determines by objective and/or subjective testing.Some low-order bit can be by scrambling in the successive sample in some successive frames.And some parameters about scrambling can frame by frame change.Have, the scrambling key can be embedded in the scrambled data, and recovers in decoder again, is used for the descrambling sample of scrambling.After the descrambling, because the scrambling key is by the descrambler scrambling, so no longer can be resumed.
Though the present invention combines various specific embodiment explanations, those skilled in the art that can find out, under the situation that does not depart from the present invention's spirit given in claims and category, can make many strains and modification.
Claims (22)
1, a kind ofly be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein:
Selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern.
2, be to provide by some frames in succession according to the sample that the process of claim 1 wherein, this method also comprises the steps:
Choose the low-order bit of wanting scrambling in this sample according to the frame at each sample place.
3, according to the process of claim 1 wherein:
Described scrambling key is a pseudorandom scrambling key.
4, according to the process of claim 1 wherein:
In described scrambling step, adopt scrambling in the sample that these low-order bit are carried out scrambling in the same sample.
5, according to the process of claim 1 wherein:
In described scrambling step, adopt scrambling between sample that these low-order bit are carried out scrambling between the different samples.
6, according to the method for claim 1, it also comprises the steps:
All or part of of scrambling key is embedded in the scrambling sample, to scrambling sample descrambling the time, uses for decoder.
7, according to the method for claim 6, wherein:
All or part of scrambling key about current scrambling sample frame is embedded in the sample frame in front.
8, according to the method for claim 6, wherein:
All or part of scrambling key about current scrambling sample frame is embedded in the current sample frame.
9, a kind ofly be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein:
Selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern; And
In described scrambling step, adopt respectively scrambling in scrambling between sample and the sample to these low-order bit carry out between the different samples with same sample in scrambling.
10, a kind ofly be not subjected to the illegal method of using by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting scrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit scrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding scrambling sample is provided; Wherein:
Selected low-order bit in each sample must be made the quality of scrambling sample descend by scrambling but still can discern; And
In described scrambling step, adopt scrambling between horizontal samples has an equal weight by exchange bit that selected low-order bit is carried out scrambling between different samples.
11, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein
Selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
12, according to the method for claim 11, sample wherein is to provide by some frames in succession, and this method also comprises the steps:
Choose the low-order bit of wanting descrambling in this sample according to the frame of each sample.
13, according to the method for claim 11, wherein:
Described scrambling key is a pseudorandom scrambling key.
14, according to the method for claim 11, wherein:
In described descrambling step, adopt descrambling in the sample that these low-order bit are carried out descrambling in the same sample.
15, according to the method for claim 11, wherein:
In described descrambling step, adopt descrambling between sample that these low-order bit are carried out descrambling between the different samples.
16, according to the method for claim 11, scrambling key wherein is embedded in the scrambling sample, and this method also comprises the steps:
From the scrambling sample, recover the scrambling key, in above-mentioned descrambling step, using.
17, according to the method for claim 16, wherein:
Scrambling key about current scrambling sample frame is embedded in the sample frame in front.
18, according to the method for claim 11, it also comprises the steps:
In described descrambling step descrambling after the scrambling sample, the scrambling key is carried out scrambling.
19, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein
Selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern; And
In above-mentioned descrambling step, adopt between sample respectively and sample in descrambling to selected low-order bit carry out between the different samples with same sample in descrambling.
20, a kind of method that is used for the content numeral sample of former scrambling is carried out descrambling, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this method may further comprise the steps:
Determine the dynamic range of each sample; And
Choose some low-order bit of wanting descrambling in this sample according to the dynamic range of each sample;
To the selected low-order bit descrambling in each sample, keep some high order bits in each sample according to a scrambling key simultaneously, thereby corresponding descrambled samples is provided; Wherein
Selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern; And
In above-mentioned descrambling step, adopt descrambling between horizontal samples to have the bit of equal weight to come selected low-order bit is carried out descrambling between the different samples by exchange.
21, a kind ofly be not subjected to the illegal equipment that uses by the numeral sample of content scrambling being protected content, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this equipment comprises:
A range detector/mask maker is used for determining the dynamic range of each sample and chooses some low-order bit that this sample is wanted scrambling according to the dynamic range of each sample;
A scrambler is used for keeping some high order bits in each sample simultaneously, thereby corresponding scrambling sample being provided according to the selected low-order bit scrambling of a scrambling key to each sample; Wherein:
Selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
22, a kind of equipment that is used for the content numeral sample of former scrambling is carried out descrambling, wherein each sample all comprises a plurality of bits from the low-order bit to the high order bit, and this equipment comprises:
A range detector/mask maker is used for determining the dynamic range of each sample and chooses some low-order bit that this sample is wanted scrambling according to the dynamic range of each sample;
A descrambler is used for keeping some high order bits in each sample simultaneously, thereby corresponding descrambled samples being provided according to the selected low-order bit descrambling of a scrambling key to each sample; Wherein:
Selected low-order bit in each sample is made the quality of scrambling sample descend by scrambling but still can discern.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8248898P | 1998-04-21 | 1998-04-21 | |
| US60/082,488 | 1998-04-21 |
Publications (2)
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|---|---|
| CN1301460A CN1301460A (en) | 2001-06-27 |
| CN1151673C true CN1151673C (en) | 2004-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB998063851A Expired - Fee Related CN1151673C (en) | 1998-04-21 | 1999-04-20 | Multimedia adaptive scrambling system (MASS) |
Country Status (8)
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|---|---|
| EP (1) | EP1095517A1 (en) |
| JP (1) | JP2002512494A (en) |
| KR (1) | KR20010034802A (en) |
| CN (1) | CN1151673C (en) |
| AU (1) | AU3752599A (en) |
| CA (1) | CA2329315A1 (en) |
| MX (1) | MXPA00010337A (en) |
| WO (1) | WO1999055089A1 (en) |
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| US7177429B2 (en) | 2000-12-07 | 2007-02-13 | Blue Spike, Inc. | System and methods for permitting open access to data objects and for securing data within the data objects |
| US6760442B1 (en) * | 1998-12-18 | 2004-07-06 | Sun Microsystems, Inc. | Method and apparatus for adjusting the quality of digital media |
| WO2000052923A1 (en) * | 1999-03-02 | 2000-09-08 | Koninklijke Philips Electronics N.V. | Method and arrangement for scrambling and descrambling information |
| US7664264B2 (en) | 1999-03-24 | 2010-02-16 | Blue Spike, Inc. | Utilizing data reduction in steganographic and cryptographic systems |
| JP4110690B2 (en) * | 1999-10-18 | 2008-07-02 | ヤマハ株式会社 | Data generation method, recording apparatus, recording medium, and reproducing apparatus |
| WO2002079955A2 (en) | 2001-03-28 | 2002-10-10 | Nds Limited | Digital rights management system and method |
| JP4391088B2 (en) | 2001-04-18 | 2009-12-24 | アイピージー エレクトロニクス ５０３ リミテッド | Audio coding using partial encryption |
| US7287275B2 (en) | 2002-04-17 | 2007-10-23 | Moskowitz Scott A | Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth |
| US7752446B2 (en) | 2002-05-15 | 2010-07-06 | International Business Machines Corporation | System and method for digital watermarking of data repository |
| FR2845543B1 (en) * | 2002-10-03 | 2005-02-04 | Medialive | SECURE AUDIO STREAMING SYSTEM |
| US7630492B2 (en) | 2002-10-03 | 2009-12-08 | Daniel Lecomte | Secure audio stream scramble system |
| GB2400285A (en) | 2003-03-31 | 2004-10-06 | Sony Uk Ltd | Digital audio processing |
| FR2875658B1 (en) * | 2004-09-21 | 2007-03-02 | Commissariat Energie Atomique | ESTIMATING THE MOST NOISE INTERFERENCE SIGNAL RATIO AT THE OUTPUT OF AN OFDM-CDMA RECEIVER. |
| US20070083467A1 (en) * | 2005-10-10 | 2007-04-12 | Apple Computer, Inc. | Partial encryption techniques for media data |
| US8055903B2 (en) * | 2007-02-15 | 2011-11-08 | Avaya Inc. | Signal watermarking in the presence of encryption |
| WO2009001139A1 (en) * | 2007-06-28 | 2008-12-31 | Taptu Ltd | Audio thumbnail |
| CN102156734B (en) * | 2011-04-12 | 2013-05-29 | 西南科技大学 | Video content management method based on semantic hidden indexing |
| CN115695675B (en) * | 2023-01-03 | 2023-03-10 | 北京特立信电子技术股份有限公司 | Video encryption method for network data secure exchange |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3784743A (en) * | 1972-08-23 | 1974-01-08 | Bell Telephone Labor Inc | Parallel data scrambler |
| US5185794A (en) * | 1990-08-06 | 1993-02-09 | Nec Home Electronics, Ltd. | System and method for scrambling and/or descrambling a video signal |
| JPH0730855A (en) * | 1993-07-08 | 1995-01-31 | Sony Corp | Recording method for video data |
-
1999
- 1999-04-20 KR KR1020007011703A patent/KR20010034802A/en not_active Application Discontinuation
- 1999-04-20 CA CA002329315A patent/CA2329315A1/en not_active Abandoned
- 1999-04-20 CN CNB998063851A patent/CN1151673C/en not_active Expired - Fee Related
- 1999-04-20 EP EP99919913A patent/EP1095517A1/en not_active Withdrawn
- 1999-04-20 AU AU37525/99A patent/AU3752599A/en not_active Abandoned
- 1999-04-20 JP JP2000545321A patent/JP2002512494A/en active Pending
- 1999-04-20 WO PCT/US1999/008635 patent/WO1999055089A1/en not_active Application Discontinuation
- 1999-04-20 MX MXPA00010337A patent/MXPA00010337A/en unknown
Also Published As
| Publication number | Publication date |
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| CA2329315A1 (en) | 1999-10-28 |
| EP1095517A1 (en) | 2001-05-02 |
| WO1999055089A1 (en) | 1999-10-28 |
| JP2002512494A (en) | 2002-04-23 |
| MXPA00010337A (en) | 2003-05-19 |
| CN1301460A (en) | 2001-06-27 |
| AU3752599A (en) | 1999-11-08 |
| KR20010034802A (en) | 2001-04-25 |
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