CN1134003C - Copy preventing apparatus and information recording medium used in this copy preventing apparatus - Google Patents
Copy preventing apparatus and information recording medium used in this copy preventing apparatus Download PDFInfo
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- CN1134003C CN1134003C CNB981225446A CN98122544A CN1134003C CN 1134003 C CN1134003 C CN 1134003C CN B981225446 A CNB981225446 A CN B981225446A CN 98122544 A CN98122544 A CN 98122544A CN 1134003 C CN1134003 C CN 1134003C
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00478—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00246—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/00282—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in the content area, e.g. program area, data area or user area
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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
- G11B20/00007—Time or data compression or expansion
- G11B2020/00014—Time or data compression or expansion the compressed signal being an audio signal
- G11B2020/00057—MPEG-1 or MPEG-2 audio layer III [MP3]
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- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
This invention protects the unauthorized copy of multimedia data, recorded on an information recording medium, by using electronic watermark information and key information. The electronic watermark information embedded in the multimedia data is extracted by an electronic watermark extraction unit on the decryption system side. A disk key is obtained using the electronic watermark information and a part master key. The multimedia data is decrypted using the resultant disk key.
Description
Technical field
The present invention relates to a copy preventing apparatus, the numerical data that this device is used to prevent to be recorded on the recording medium is subjected to bootlegging.The invention still further relates to the information recording carrier that is used for copy preventing apparatus.
Technical background
Traditional multimedia messages (for example, image and speech data) recording medium has floppy disk, CD, DVD (digital video disk) etc.
(also comprise packed data and coded data that can be decoded) because numerical data and be and directly be recorded on the above-mentioned dissimilar digital recording medium, therefore recorded data can be copied to other medium easily and got on, and do not have any loss of data, therefore there is the problem such as piracy.
For addressing these problems, can adopt a kind of the coding to digital data also the method for digital data record on recording medium behind the coding.Yet, owing to inevitably allow data to duplicate again to the deficiency of the management of the coding key word that is used to encode recorded.
Summary of the invention
The present invention has considered above-mentioned situation, and its purpose is to provide a numerical data that is used to prevent to be recorded on the recording medium to be subjected to copy preventing apparatus from the bootlegging of recording medium.
Another object of the present invention is to be provided for the information recording carrier of this copy preventing apparatus.
In order to realize above-mentioned purpose according to a first aspect of the invention, a kind of copy preventing apparatus is provided, comprising:
An encoding device; With
Decoding equipment by linking to each other with described encoding device,
Wherein said encoding device comprises:
First code device is used for the public coding key word by using described encoding device and described decoding equipment to share, the code-wheel key word that use dish key word itself has been encoded encoded,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described public coding key word that the code-wheel key word that uses primary key to encode is encoded,
Second conveyer is used for transmitting the code-wheel key word of having been encoded by described second code device to described decoding equipment,
The 3rd code device is used for by using described public coding key word that multi-medium data is encoded, and wherein electronic watermark information embeds as the form of the part of described primary key in multi-medium data,
The 3rd conveyer, be used for to described decoding equipment transmit the multi-medium data of having encoded by described the 3rd code device and
The 4th conveyer is used to transmit and has used the multi-medium data of having been encoded by described dish key word, and
Described code translator comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
The 3rd code translator is used to use public coding key word that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting described watermark information from the multi-medium data of being deciphered by described the 3rd code translator,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by watermark information that described draw-out device extracted with corresponding to the part primary key of the part of described primary key, obtain the dish key word and
The 4th code translator is used for by using the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 4th conveyer is deciphered.
According to a kind of copy preventing apparatus of the present invention, comprising:
An encoding device; With
A decoding equipment that links to each other with described encoding device to described code translator,
Wherein said encoding device comprises:
First code device is used for encoding by the dish key word that uses between described encoding device and described decoding equipment the coding that the public coding key word shared itself encoded to use dish key word,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described public coding key word that the dish key word of the coding that uses primary key and encoded is encoded,
Second conveyer is used for transmitting the dish key word of having been encoded by described second code device to described decoding equipment,
The 3rd conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and in multi-medium data electronic watermark information embed as the form of the part of described primary key and
The 4th conveyer is used to transmit the multi-medium data that use dish key word and watermark information have been encoded, and
Described decoding equipment comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by the watermark information that described draw-out device extracted, with obtain corresponding to the part primary key of the part of described primary key the dish key word and
The 3rd code translator is used to use the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting electronic watermark information from the multi-medium data of being deciphered by described the 3rd code translator,
The 4th code translator is used on the basis by electronic watermark information that described draw-out device extracted and the dish key word that obtained by described dish key word deriving means the multi-medium data that is sent by described the 4th conveyer being deciphered.
A kind of copy preventing apparatus according to the present invention comprises:
An encoding device; With
A decoding equipment that links to each other with described encoding device to described code translator,
Wherein encoding device comprises:
First code device is used for encoding by the key word of code-wheel that uses the common code key word shared between described encoding device and the described decoding equipment that use dish key word itself has been encoded,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described common code key word that the dish key word that uses primary key to encode is encoded,
Second conveyer is used for transmitting the dish key word of having been encoded by described second code device to described decoding equipment,
The 3rd conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and in multi-medium data electronic watermark information embed as the form of the part of described primary key and
The 4th conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and electronic watermark information is superimposed upon on the multi-medium data, and
Described code translator comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by the watermark information that described draw-out device extracted, with obtain corresponding to the part primary key of the part of described primary key the dish key word and
The 3rd code translator is used to use the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting electronic watermark information from the multi-medium data of having been deciphered by described the 3rd code translator,
The 4th code translator, be used to use the dish key word that obtained by described dish key word deriving means to send by described the 4th conveyer that multi-medium data is deciphered and
The 5th code translator is used to use the electronic watermark information that extracted by described draw-out device that the multi-medium data of having been deciphered by described the 4th code translator is deciphered.
Description of drawings
Fig. 1 is the block diagram of an expression according to the copy preventing apparatus of the first embodiment of the present invention;
Fig. 2 is the process flow diagram of operation of the copy preventing apparatus of an expression first embodiment;
Fig. 3 is the process flow diagram of operation of the primary key code translator/decision circuit in the copy preventing apparatus of an expression first embodiment;
Fig. 4 is recorded in method on the information recording carrier to data at one expression a kind of being used for, and wherein information recording carrier is the block diagram that is used for the copy preventing apparatus of first embodiment;
Fig. 5 is the block diagram of expression copy preventing apparatus according to a second embodiment of the present invention;
Fig. 6 is the process flow diagram of operation of the copy preventing apparatus of an expression second embodiment;
Fig. 7 is recorded in method on the information recording carrier to data at one expression a kind of being used for, and wherein information recording carrier is the block diagram that is used for the copy preventing apparatus of second embodiment;
Fig. 8 is the block diagram of the copy preventing apparatus of an expression a third embodiment in accordance with the invention;
Fig. 9 is the process flow diagram of operation of the copy preventing apparatus of an expression the 3rd embodiment;
Figure 10 is recorded in method on the information recording carrier to data at one expression a kind of being used for, and wherein information recording carrier is the block diagram that is used for the copy preventing apparatus of the 3rd embodiment.
Embodiment
In the present embodiment, use key word K that one operation of encoding for given data a be can be expressed as EK (a), and use key word K that one operation of deciphering for given data a be can be expressed as DK (a).By using these expression formulas, use key word K to encode and the operation deciphered can be expressed as DK (EK (a)) to given data to one.
Present embodiment will be with a system as example, and this system is used to duplicate according to being called the MPEG-Audio data compression standard and compresses and encode and be recorded in speech data on the DVD.
Have a plurality of primary keys in the present embodiment, and distribute to the one or more primary keys of each predetermined unit, for example distribute to decoding equipment manufacturer (or DVD manufacturer or sales company).
＜the first embodiment 〉
Various details first embodiment.
Fig. 1 is a block diagram, and expression is according to the copy preventing apparatus of the first embodiment of the present invention.
The system of this embodiment links to each other with the cpu bus of playback CPU, and the coding after data on cpu bus, transmit, wherein playback CPU is arranged in computing machine, for example is arranged in personal computer (back is called PC).Note the part of the system that just links to each other shown in Fig. 1 with playback CPU.
As shown in Figure 1, the copy preventing apparatus of this embodiment comprises an encoding device A and a decoding equipment C.Encoding device A and decoding equipment C can be positioned in and be used for from the DVD driving arrangement of DVD1 reading of data.In addition, device A also can directly link to each other with the DVD driving arrangement with C and need not pass through cpu bus.
Encoding device A links to each other with cpu bus B with decoding equipment C.Data from decoding equipment C are exported by for example I/O port except that cpu bus B.Especially, among this embodiment, data are transfused to/export and not by cpu bus B, need use cpu bus B but the data between device A and C transmit.
Encoding device A comprises code translator/error correction circuit 2 and code translator/error correction circuit 7, scrambler 4 and scrambler 9 and gauge tap 8.Gauge tap 8 receives a control signal (CS1), is used for when first processing unit of data sequence is transfused to data being sent to scrambler 9.Otherwise gauge tap receives a control signal (CS1), directly data is outputed to cpu bus B.
Referring to Fig. 1, illustrate two scramblers 4 and 9 among the encoding device A.Yet an in fact available scrambler substitutes this two scramblers.
Encoding device A is IC chip independently in form.
Decoding device C comprises code translator 5,10,12, primary key code translator/decision circuit 6, eletric watermark extraction circuit 11 and gauge tap 13.
Gauge tap 13 receives control signals (CS2) so that when first processing unit of data sequence is transfused to, reception one from the signal of eletric watermark extraction circuit 11 as input signal.Otherwise gauge tap 13 receives control signals (CS2), with receive one from the signal of code translator 12 as input signal.
Decoding device C comprises that also a MPEG-code translator 14 and is used for the digital voice data after the decoding is converted to the D/A converter 15 of analog voice data.
Referring to Fig. 1, in decoding equipment, illustrate four code translators 5,10,12,14.In fact, an available code translator substitutes this four code translators.Decoding equipment C is IC chip independently in form.
Some primary keys that the back will be described are registered among the decoding equipment C.Primary key is recorded in the secure domain of chip, thereby does not allow the user externally to obtain them or the user intentionally reads them from the chip of decoding equipment C.
Following several method can be used to be provided with and is recorded in that DVD1 goes up and by using primary key Mki to the dish key word key word E that the back generated that encodes
MkiThe number of the type of part primary key Mkj ' among the number of type (DK) and the decoding equipment C.
Dish key word E after (method 1) encoded by a primary key
Mki(DK) (i=1..n) be recorded on the DVD1, wherein i is a numeral from 1 to n.N part primary key Mkj ' corresponding to all key word j (j=1..n) is stored among the decoding equipment C.
(method 2) is by the dish key word E after encoding corresponding to all n the primary keys of all key word i (i=1..n)
Mki(DK) be recorded on the DVD1.Part primary key Mkj ' corresponding to one of them key word j (j=1..n) is stored among the decoding equipment C.
(method 3) method 3 is expansions of method 2.By the dish key word E after encoding corresponding to n the primary key of all key word i (i=1..n)
Mki(DK) be recorded on the DVD1.(2＜m＜n) individual part primary key is stored among the decoding equipment C M that selects in advance from all key word j (j=1..n).
In (method 4) method 3, the key word that is recorded on DVD1 and the decoding equipment C is a backward.By the m that from all key word i (i=1..n), is selected in advance (the dish key word E after 2＜m＜n) individual primary key is encoded
Mki(DK) be recorded on the DVD1.N part primary key Mkj ' corresponding to all key word j (j=1..n) is stored among the decoding equipment C.
(method 5) is by the dish key word E after encoding corresponding to n the primary key of all key word i (i=1..n)
Mki(DK) be recorded on the DVD1.N part primary key Mkj ' corresponding to all key word j (j=1..n) also is stored among the decoding equipment C.
Also change as the partial key information WM of watermark information embedding and the arithmetical operation of primary key code translator/decision circuit 6 by said method.
Coding key word/decoding the key word that is used for the cryptographic communication carried out by cpu bus B provides with the form of public keyword code BK.The method of sharing the code key word between encoding device A and decoding equipment C is identical with traditional method.
Controller (not expressing among the figure) control whole operation.For example, controller can be carried out a program by the CPU that makes computing machine and is identified.The example of the control of this controller is the indication relevant with the data that read from DVD1, transmits the relevant indication in destination with data, the indication relevant with the data of exporting from decoding equipment, etc.
Controller is triggered by a user interface or by the processing in the given application program by the user.
In this embodiment, the digital resource speech-sound data sequence, speech-sound data sequence (compressed data sequences) and speech data be correspondingly by D-Audio, AD={AD1, AD2, ..., ADi ... }, and WM (ADi) expression, wherein the data of some primary keys are embedded into as the form of eletric watermark in speech data.
According to speech-sound data sequence AD, except embedded electronic watermark information, also can embed and duplicate the control electronic watermark information.Make BK, DK, { Mk1, Mk2 ..., Mki, ..., Mkn} and Mk1 ', Mk2 ', ..., Mkj ' ..., Mkm ' } be respectively between encoding device and decoding equipment the coding key word of sharing (referring to public coding key word), the coding key word (dish key word) that is used for the coded voice data sequence, be used for n of code-wheel key word coding key word (primary key) group and the part primary key in decoding equipment, registered bunch.
Notice that the part primary key is the key word corresponding to m key word of n primary key.Each part primary key all is to be prepared for by carry out the data that a specific arithmetical operation obtains primary key between the data that extracted by WM (ADi).
E
DK(DK) expression is by the dish key word of use dish key word to the back generation of himself encoding.{ E
Mki(DK) (i=1..., n) } the dish key word of expression by being generated after using n primary key that the dish key word is encoded.WM (ADi) expression embeds the speech data ADi that data generated of some primary keys by using the eletric watermark technology.E
DK(ADi) expression is by the use dish key word speech data that generated of back of encoding.E
BK(E
DK(DK) the dish key word itself of encoding by the dish key word that is generated after using public keyword BK to encode is used in expression.E
BK(E
Mki(DK)) the dish key word bunch dish key word of encoding by being generated after using public coding key word BK to encode is used in expression.E
BK(E
DK(ADi)) speech data of public coding key word BK to using public coding key word that speech data is encoded and generated after the back speech data that is generated is encoded used in expression.
By coiling the E that key word self is generated its coding back
DK(DK) with by using primary key bunch to the dish key word { E that the back generated that encodes
Mki(DK) } be recorded in the keyword record territory (importing territory) of periphery of inside of DVD1.By some primary keys are embedded into speech-sound data sequence AD={AD1 as the form of eletric watermark, AD2 ..., ADi ... } in the WM (ADi) that obtained and by the use dish key word E that the back generated that encodes
DK(ADi) be recorded in the data recording territory (data field) of DVD1.
The operation of this embodiment is described with reference to the process flow diagram among Fig. 2 below.
In step S11, the coding key word BK that is used for communicating by letter between encoding device A and decoding equipment C is shared by using existing coding key word to share agreement 3.
In step S12, be recorded in the dish key word E that use dish key word DK encodes to self that passes through on the DVD1 by DVD driving arrangement (not showing among the figure)
DK(DK) with by using the primary key bunch dish key word { E that encodes
Mki(DK) } be read out.Scrambler 4 uses public keyword BK that the key word that is read is encoded, to obtain E
BK(E
DKAnd { E (DK))
BK(E
Mki(DK)) }.These codes are sent to decoding equipment C by cpu i/f or bus B.Notice that before the data that read were imported into scrambler 4, these data were deciphered and error correction by code translator/error correction circuit 2 from DVD1.
In step S13, the code translator 5 among the decoding equipment C uses common code key word BK, to the key word E that is received by cpu i/f B
BK(E
DKAnd { E (DK))
BK(E
Mki(DK)) } decipher, to obtain E
DK(DK) and { E
Mki(DK) }.
In step S14, encoding device A reads speech data WM (MDi), and wherein the information of some primary keys is embedded into as the form of eletric watermark in WM (MDi).Scrambler 9 uses public keyword BK to encode WM (Mdi) to obtain E
BK(WM (ADi)).Data are sent to decoding equipment C by cpu i/f B.Notice that before data were imported into scrambler 9, the data that read were deciphered and error correction by code translator/error correction circuit 7 from DVD1.
In step S15, the code translator 10 among the decoding equipment C uses public keyword BK, to the key word E that is received by cpu i/f B
BK(WM (ADi)) deciphers, to extract WM (ADi).Eletric watermark extraction circuit 11 extracts as some primary key Mki and is embedded in information WM among the audio data AD i.Information WM is sent to MPEG-code translator 14 by gauge tap 13WM (ADi) after extracting.
In step S16, primary key code translator/decision circuit 6 uses the dish key word E that is encoded by use dish key word Dk self
DK(DK) and the dish key word { E of the primary key bunch coding that in step S13, is obtained
Mki(DK) }, and the information WM of some primary keys of conduct of in step S15, obtaining and in decoding equipment the part primary key of registered in advance bunch extract dish key word DK.
The operation of primary key code translator/decision circuit 6 is described with reference to Fig. 3 below.
Part primary key Mkj ' is extracted from storer (J0), wherein stores the part primary key { Mkj ' } bunch among the decoding equipment C in the storer (J0).Primary key code translator/decision circuit 6 is carried out arithmetical operations (J1), with by using the information WM as some primary keys to generate predetermined primary key, thereby obtains primary key candidate Mkj.
Code translator J2 uses primary key candidate Mkj, to by using primary key { Mki} bunch of dish key word E that encodes
Mki(DK) decipher, with acquisition dish key word candidate DK '.The dish key word E of code translator J3 use dish key word candidate DK ' to encoding by use dish key word self
DK(DK) decipher, thus acquisition dish key word candidate DK ".
" DK's comparer J4 ' compares with dish key word candidate dish key word candidate DK.If both conform to, then coil key word candidate DK ' and export from primary key code translator/decision circuit 6 as correct dish key word DK; Otherwise, repeat aforesaid operations, until obtaining correct dish key word.
In step S17, use dish key word DK encodes and is recorded in speech data E on the DVD1 by a DVD driving arrangement (not expressing among the figure)
DK(ADi) be read out, and deliver to decoding equipment C by cpu i/f B.Before data were sent to cpu i/f B, the data that read from DVD1 were deciphered and error correction by code translator/error correction circuit 7.
In step S18, code translator 12 Es of use dish key word DK among the decoding equipment C to being received by cpu i/f B
DK(ADi) decipher, to obtain as compressed voice audio data AD i expressly.
In step S19, judge and whether continue decoded operation.If be, the then operation among repeated execution of steps S17 and the S18.
When speech data ADi was compressed according to data compression standard as a result, for example according to the data compression standard that is called the MPEG-voice, data were deciphered (expansion) by MPEG-code translator 14.Data after the decoding are converted to simulating signal by D/A converter 15.Simulating signal is sent to for example speaker amplifier (not expressing among the figure) and being replicated of a voice amplification/output device.
The execution sequence of step S12 and S14 is interconvertible.
Speech data has enough length to embed the keyword message of some primary keys, and wherein the information of some primary keys is embedded into the form of electronic watermark information in speech data.If speech data does not have enough length, then electronic watermark information is embedded in a plurality of speech datas.
Speech data ADi does not need sequentially to be sent to MPEG-code translator 14 from code translator 12, but can be that unit transmits with the speech data of predetermined number.
According to the copy preventing apparatus of present embodiment, electronic watermark information must be used to the decode disk key word, and can prevent to sell the business activity of bootlegging medium, thereby prevents piracy.
According to the copy preventing apparatus of present embodiment, coding and decoding scheme can be designed to be independent of for example core of duplicating part of DVD1 of digital recording/copying equipment, and this point sees it is conspicuous from Fig. 1.Even code and eletric watermark have illegally been deciphered, have only decoding equipment C (or encoding device A and decoding equipment C) to be substituted by another.
According to copy preventing apparatus of the present invention, even the data that flow on the bus B of CPU have been stored, these data still can not be replicated or use.
The primary key information of registering on decoding equipment C is not as complete keyword message.Whenever DVD 1 during, must use the keyword message that is included in the content to obtain complete keyword message by playback.Even the primary key information of being registered among the decoding equipment C has been deciphered completely and attempted to misapply primary key information after having deciphered, but still playback normally of DVD1.
At last, with reference to Fig. 4 a kind of method that is used for writing down speech data and keyword message on DVD1 according to this embodiment is described.
In the system of present embodiment, when the speech data of being imported was simulated data (A-voice), then an A/D converter 21 became numerical data (D-voice) with this data-switching.If desired, then in eletric watermark embeds in the circuit 22 numerical data after copy control information (CCI) and the embedding of other information changed.Notice that according to the layout of circuit, eletric watermark embeds circuit 22 and can be left in the basket.MPEG-speech coder 23 is used for packed data.
When the information WM as some primary keys will be embedded into, be output to an eletric watermark from the output speech data ADi of MPEG-speech coder 23 by converter 24 and embed circuit 25.
When data were transfused to, eletric watermark embedded circuit 25 and is embedded into the information of some primary keys among the speech data ADi and output data WM (ADi) with the form of eletric watermark.
Eletric watermark embeds circuit 25 and receives speech data ADi, has wherein embedded all the information WM as some preparation primary keys in ADi.Speech data WM (ADi) directly is recorded on the DVD27, wherein in speech data information WM as some primary keys.
Speech data ADi is output to a scrambler 26 by converter 24, wherein need not embed the information WM as some primary keys in the speech data.Scrambler 26 uses the speech data ADi that is imported that dish key word DK is encoded.Speech data DK (ADi) behind the coding is recorded on the DVD27.
Be used for the key word { E that the primary key bunch of coded voice data ADi is encoded and obtained dish key word DK by use
Mki(DK) } and by the key word DK (DK) that encodes of dish key word self also be recorded on the DVD27.
Among Fig. 4, be embedded in by among the speech data ADi after 23 compressions of MPEG-speech coder as the information of some primary keys form with eletric watermark.Yet eletric watermark embeds circuit and can be embedded in eletric watermark in the digital voice data before compression.In this case, eletric watermark embedding circuit 25 can be left in the basket.
＜the second embodiment 〉
Copy preventing apparatus according to a second embodiment of the present invention will be described below.
Fig. 5 is a view, the copy preventing apparatus of the expression second embodiment of the present invention.Among Fig. 5 with Fig. 1 in the identical identical part of parametric representation, therefore will omit detailed description below to these parts.
The copy preventing apparatus of this embodiment links to each other with the cpu bus of playback CPU, and the data behind the coding are mobile on cpu bus, and wherein playback CPU is arranged in computing machine, for example is arranged in personal computer (back is called PC).Note the part of the copy preventing apparatus that just links to each other shown in Fig. 5 with playback CPU.
Encoding device A links to each other with decoding equipment C by cpu bus B.Data from decoding equipment C are exported by for example I/O port except that cpu bus B.Especially, among this embodiment, data need be used cpu bus B not by cpu bus B I/O but the data between device A and C transmit.
Encoding device A comprises code translator/error correction circuit 2 and code translator/error correction circuit 7 and scrambler 4.Encoding device A is IC chip independently in form.
Decoding device C comprises code translator 5 and 34, primary key code translator/decision circuit 31, eletric watermark extraction circuit 35, gauge tap 33 and key word generative circuit 32.
In this embodiment, decoding equipment C comprises that also a MPEG-code translator 14 and is used for the digital voice data behind the coding is converted to the D/A converter 15 of analog voice data.
Among Fig. 5, in decoding equipment, illustrate two code translators 5,34.Yet an in fact available code translator substitutes this two code translators.Decoding equipment C is IC chip independently in form.
Some primary keys that the back will be described are registered (storage) in decoding equipment C.Primary key is recorded in the secure domain of chip, thereby does not allow the user to obtain them from the outside or the user intentionally reads them from the chip of decoding equipment C.
The available method identical with first embodiment is provided with the key word E that by the primary key Mki of service recorder on DVD1 the dish key word is encoded and then generated among the decoding equipment C
MkiThe number of the type of part primary key Mki ' among the number of type (DK) and the decoding equipment C.
Coding key word/decoding the key word (owing to use public keyword, therefore being BK) that is used for by the cryptographic communication of cpu bus B execution is shared by encoding device A and decoding equipment C.
Controller (not expressing among the figure) control whole operation.For example, controller can be carried out a program by the CPU that makes computing machine and by computer Recognition.The example of the control of this controller is the indication relevant with the data that read from DVD1, transmits the relevant indication in destination with data, the indication relevant with the data of exporting from decoding equipment etc.
Controller is triggered by a user interface or by the processing in the given application program by the user.
In this embodiment, the digital resource speech-sound data sequence, speech-sound data sequence (compressed data sequences) and speech data are correspondingly by D-Audio, AD={AD1, AD2 ..., ADi, ... and WM (ADi) expression, wherein the data of the primary key of some in speech data are embedded into the form of eletric watermark.
According to speech-sound data sequence AD, except embedded electronic watermark information, also can embed and duplicate the control electronic watermark information.Make BK, DK, { Mk1, Mk2 ..., Mki, ..., Mkn} and Mk1 ', Mk2 ', ..., Mkj ' ..., Mkm ' } be respectively between encoding device and decoding equipment the coding key word of sharing (referring to public coding key word), the coding key word (dish key word) that is used for the coded voice data sequence is used for n of code-wheel key word coding key word (primary key) bunch and the part primary key registered bunch in decoding equipment.
Among Fig. 5, E
DK(DK) the expression dish key word of encoding and being generated by use dish key word itself.{ E
Mki(DK) (i=0,1 ..., n-1) } the dish key word of expression by being generated after using n primary key to encode.The speech data ADi that WM (ADi) expression is generated, this speech data generate by the needed information of coding key word that embeds in order to generate the speech data subsequently that uses the eletric watermark technology.E
DK+WM(ADi) expression by use dish key word DK and the information WM that delivers to decoding equipment by eletric watermark in advance to the ADi speech data that the back generated of encoding.E
BK(E
DK(DK) expression is by using the dish key word itself of being encoded by the dish key word that uses common code key word BK coding back to be generated.E
BK(E
Mki(ADi)) the primary key bunch key word of encoding by using public keyword BK to encode is used in expression.
By the E that is generated behind dish key word self the code-wheel key word
DK(DK) with by using primary key bunch to the dish key word { E that the back generated that encodes
Mki(DK) } be recorded in the keyword record territory (importing territory) of periphery of the inside of DVD1.E
DK(WM (ADi)) and E by using data key words (for example, by the dish key word that key word generated and deliver to the information WM of decoding equipment as the eletric watermark) back of encoding to be generated
DK+WM(ADi) be recorded in the data recording territory (data field) of DVD1, wherein at E
DKBe used to generate speech-sound data sequence AD={AD1 in (WM (ADi)), AD2 ..., ADi ... } in subsequently the partial information of decoding key word of speech data be embedded into as the form of eletric watermark.
The operation of present embodiment is described with reference to the process flow diagram of Fig. 6 below.
In step S21, share and be used for the coding key word BK that communicates by letter between encoding device A and decoding equipment C by using existing coding key word to share agreement.
In step S22, be recorded in by DVD driving arrangement (not showing among the figure) and pass through use dish key word DK self to its dish key word E that encodes on the DVD1
DK(DK) and dish key word { E by using primary key bunch that the dish key word is encoded
Mki(DK) } be read out.Scrambler 4 uses public keyword BK that the key word that is read is encoded, to obtain E
BK(E
DKAnd { E (DK))
BK(E
Mki(DK)) }.These codes are sent to decoding equipment C by cpu i/f or bus B.
Notice that before the data that read were imported into scrambler 4, these data were deciphered and error correction by code translator/error correction circuit 2 from DVD 1.
In step S23, the code translator 5 among the decoding equipment C uses public keyword BK, to the key word E that is received by cpu i/f B
BK(E
DKAnd { E (DK))
BK(E
Mki(DK)) } decipher, to obtain E
DK(DK) and { E
Mki(DK) }.
In step S24, primary key code translator/decision circuit 31 is by use dish key word E
DK(DK) and { E
Mki(DK) } and the primary key Mkj that in decoding equipment, registers in advance bunch extract dish key word DK, wherein E
DK(DK) the dish key word of encoding for use dish key word DK itself, { E
Mki(DK) } for using Mki bunch of dish key word of encoding of primary key.
The operation of primary key code translator/decision circuit 31 will be described below.
Primary key Mkj be from decoding equipment, registered primary key Mkj} bunch storer in extract.By using primary key { Mkj} bunch of dish key word E that encodes
Mki(DK) by using primary key candidate Mkj decoded, with acquisition dish key word candidate DK '.
By coiling key word itself to its obtained E in back that encodes
DK(DK) decoded by use dish key word candidate DK ', with acquisition dish key word candidate DK ".
" DK's dish key word candidate DK ' compares with dish key word candidate.If both conform to, coil then that key word candidate DK ' is judged as correct dish key word and from primary key code translator/decision circuit 31 output; If both do not conform to, then repeat aforesaid operations, until obtaining correct dish key word.
In step S25, encoding device A reads speech data E
DK(WM (ADi)), wherein E
DK(WM (ADi)) is recorded on the DVD1 by a DVD driving arrangement (not expressing among the figure), and by dish key word DK it encoded, and the necessary information of decoding key word that is used for the formation sequence voice is embedded in E
DKIn (WM (ADi)).The speech data of being read is sent to decoding equipment C by cpu i/f B.Notice that the data of being read were deciphered and error correction by code translator/error correction circuit 7 before being imported into encoding device A from DVD1.
In step S26, the code translator 34 data Es of use dish key word DK among the decoding equipment C to being received by cpu i/f B
DK(WM (ADi)) deciphers, to extract key word WM (ADi).Then, eletric watermark extraction circuit 35 extracts for the necessary information WM of decoding key word that generates speech data subsequently, and wherein information WM is embedded among the audio data AD i.After information WM was extracted out, WM (ADi) was provided directly to the MPEG-code translator.Key word generative circuit 32 use dish key word DK and key word generate information WM and generate speech data decoding key word DK
+ WM
In this case, it is corresponding that decoding key word (this decoding key word is identical with the coding key word that uses public keyword) and being used for writes down the coding key word of speech data on DVD1.Be used for the dish key word that coding/decoding first speech data and key word generate information WM, and be used between the key word of coding/decoding speech data subsequently following several different relation being arranged.Speech data subsequently (coding/decoding) key table is shown DK in the following description
+ WM
(concerning 1) generates signal by dish key word DK and key word and is adjusted into and coils the coding key word that " different " data that key word has an identical data length are defined as speech data subsequently.
The dish key word DK that (concerning 2) use key word generation information WM encodes as the coding key word is defined as the coding key word of speech data subsequently.
In step S27, DVD driving arrangement (not expressing among the figure) reading and recording is on DVD1 and use speech data key word DK
+ WMThe speech data E that encodes
DK+WM(ADi), and the data that read deliver to decoding equipment C by cpu i/f B.The data of being read from DVD1 were deciphered and error correction by code translator/error correction circuit 7 before being sent out by cpu i/f B.
In step S28, the code translator 34 among the decoding equipment C uses speech data key word DK
+ WMTo the data E that is received by cpu i/f B
DK+WM(ADi) decipher, thereby obtain as compressed voice audio data AD i expressly.
In step S29, judge whether continue decoding.If be, then repeated execution of steps S27 and S28.
As mentioned above, when being to use data compression standard, result data ADi compresses, for example used the compression standard that is called the MPEG-speech data, then data are deciphered (expansion) and by D/A converter 15 packed data are converted to simulating signal by MPEG-code translator 14.Simulating signal is sent to one speech amplifier/output device, and for example speaker amplifier (not expressing among the figure) is replicated then.
Data have enough length to generate information with the key word that embeds the speech data key word, and wherein the key word of speech data key word generates the form embedding of information as electronic watermark information in these data.If speech data does not have enough length, then electronic watermark information is embedded in a plurality of speech datas.
Speech data ADi does not need sequentially to be sent to MPEG-code translator 34 from code translator 12, but can be that unit transmits with the speech data of predetermined number.
According to the copy preventing apparatus of this embodiment, electronic watermark information is embedded in the multi-medium data and is used to decipher multi-medium data, and can prevent from illegally to sell the business activity of replicating medium, thereby prevents piracy.
According to the copy preventing apparatus of this embodiment, the same with among first embodiment, coding and decoding scheme can be designed to be independent of the core partly of duplicating of DVD that digital recording/copying equipment for example sees from Fig. 5.Even code and eletric watermark have illegally been deciphered, but have only decoding equipment C (or encoding device A and decoding equipment C) to be replaced with another.
At last, describe according to present embodiment a kind of with reference to Fig. 7 and be used for speech data and keyword message are recorded in method on the DVD1.
In this system, when the speech data of input was simulated data A-voice, then the simulated data of being imported converted digital voice data D-voice to by analogue-to-digital converters, and the input digit speech data.
Eletric watermark embeds circuit 42 and generates data, and these data obtain by information WM being embedded in the first input digital data D-voice.Information WM is necessary for generating the coding key word, and the key word of wherein encoding is used for writing down speech data so that it is deciphered on DVD47.43 compressions of MPEG-speech coder are from the data output and the output speech data WM (ADi) of circuit 42.
In this case, key word generative circuit 46 use dish key word DK and information WM generate coding key word DK
+ WM, wherein information WM is necessary for the coding key word that generation is used at the DVD47 identifying recording layer.
Key word generative circuit 46 has arbitrary placement, can not generate coding key word DK by dish key word DK and keyword message WM in these layouts
+ WM
Output speech data ADi from 43 outputs of MPEG-speech coder is encoded by use dish key word DK by scrambler 44.Speech data E behind the coding
DK(WM (ADi)) is recorded on the DVD47.
When all information WM are embedded in eletric watermark when embedding in the circuit 42, then switch 41 is switched by a control signal CS, and wherein information WM is used for coding key word DK at the DVD47 identifying recording layer for generation
+ WMBe necessary.Numerical data D-voice subsequently directly are imported into MPEG-speech coder 43, export corresponding compressed voice audio data AD i then.
DVD47 also records by using primary key bunch to the dish key word DK { E that the back obtained that encodes
MkiAnd the DK (DK) that encodes by use dish key word itself (DK) }.
For describe tube just for the purpose of, be used coding key word DK by the speech data ADi of MPEG-speech coder compression
+ WMDirectly encode.Following improvement is protected data further.
(improvement) key word generates information WM and is defined as information WMi, change as the function of time series, and all speech datas embeds as the form of electronic watermark information.Be used for changing into DK on the basis at embedded information WMi at the code key word of DVD47 identifying recording layer at every turn
+ WMi-1Speech data E after being encoded
DK+WMi-1(WM (ADi)) is recorded on the DVD47.
＜the three embodiment 〉
Fig. 8 is a block diagram, the copy preventing apparatus of expression a third embodiment in accordance with the invention.Among Fig. 8 with Fig. 1 in the identical parts of identical parameter indication, therefore will omit detailed description to these parts.Only illustrate a part that links to each other with playback CPU among Fig. 8.
The copy preventing apparatus of this embodiment comprises that one is used for the DVD driving arrangement from the DVD1 reading of data, and does not link to each other with the DVD driving arrangement by cpu bus or is integrated in encoding device A and decoding equipment C in the DVD driving arrangement.
Encoding device A links to each other with decoding equipment C by cpu bus B.Data from decoding equipment C are output by for example I/O interface except that cpu bus B.Especially, in this embodiment, data need be used cpu bus B not by cpu bus B I/O but the data between device A and C transmit.
Encoding device A comprises code translator/error correction circuit 2 and a code translator/error correction circuit 7 and a scrambler 4.Encoding device A is an IC chip independently in form.
Decoding device C comprises code translator 5 and 50, primary key code translator/decision circuit 31, and eletric watermark extraction circuit 51, overlapped information is eliminated circuit 53 and delay circuit 52.The decoding equipment C of present embodiment comprises that a MPEG-code translator 14 and is used for the digital voice data after the decoding is converted to the D/A converter 15 of analog voice data.
Illustrate two code translators 5 and 50 among the decoding equipment C, but can only substitute this two code translators with a code translator.Decoding equipment C is an IC chip independently in form.
With identical among second embodiment, some primary keys are registered (storage) in decoding equipment C.Primary key is recorded in the secure domain of chip, thereby does not allow the user to obtain them from the outside or the user intentionally reads them from the chip of decoding equipment C.
The available method identical with first embodiment is provided with key word E
MkiThe number of the type of part primary key Mki, wherein key word E among the number of type (DK) and the decoding equipment C
Mki(DK) being recorded in DVD1 upward and after using primary key Mki that the dish key word is encoded generates.
Coding key word/decoding the key word (owing to use public keyword, therefore being BK) that is used for cryptographic communication by cpu bus B is shared by encoding device A and decoding equipment C.
Controller (not expressing among the figure) control whole operation.For example, controller can be carried out a program by the CPU that makes computing machine and by computer Recognition.The example of the control of this controller is the indication relevant with the data that read from DVD, transmits the relevant indication in destination with data, the indication relevant with the data of exporting from decoding equipment etc.
Controller is triggered by a user interface or by the processing in the given application program by the user.
In this embodiment, the digital resource speech-sound data sequence, speech-sound data sequence (compressed data sequences) and speech data are correspondingly by D-Audio, AD={AD1, AD2 ..., ADi, ..., and WM (ADi) expression, wherein information embeds as the form of eletric watermark in speech data.
According to speech-sound data sequence AD, except embedding electronic watermark information, also can embed and duplicate the control electronic watermark information.Make BK, DK, { Mk1, Mk2 ..., Mki, ..., Mkn} and Mk1 ', Mk2 ', ..., Mkj ' ..., Mkm ' } be respectively between encoding device A and decoding equipment C the coding key word of sharing (referring to public coding key word), the coding key word (dish key word) that is used for the coded voice data sequence is used for n of code-wheel key word coding key word (primary key) bunch and the part primary key registered bunch in decoding equipment C.
Among Fig. 8, E
DK(DK) the expression dish key word of encoding and being generated by use dish key word itself.{ E
Mki(DK) (i=0,1 ..., n-1) } represent by using n the dish key word that primary key is encoded and generated.The speech data ADi that WM (ADi) expression generates by the needed information of key word that embeds for the coding that generates the speech data subsequently that uses the eletric watermark technology.
E
DKThe WM (ADi) that (WM (ADi)) expression use dish key word DK encodes and generates.ADi*WM represents speech data ADi, and wherein the information WM that sends to decoding equipment in advance by eletric watermark is superimposed on the ADi.E
DK(ADi*WM) represent (ADi*WM) that use dish key word DK encodes and generates.E
BK(E
DK(DK)) E that common code key word BK encodes and generates is used in expression
DK(DK).E
BK(E
Mki(DK)) be to be used for representing the E that uses public coding key word BK to encode and generate
Mki(DK).
By coiling the E that key word self is generated its back of encoding
DK(DK) with by using primary key bunch to the dish key word { E that the back generated that encodes
Mki(DK) } be recorded in the keyword record territory of periphery of inside of DVD1 (introducing territory).E
DK(WM (ADi)) and the E that the speech data that superposes with electronic watermark information WM is encoded and then obtained by use dish key word
DK(ADi*WM) be recorded in the data recording territory (data field), wherein E
DK(WM (ADi)) obtains after by use dish key word speech data being encoded, and in the speech data, at speech-sound data sequence AD={AD1, AD2, ..., ADi ... } in the information that superposes on subsequently the speech data embed as the form of electronic watermark information WM.
The operation of present embodiment is described with reference to the process flow diagram among Fig. 9 below.
Step S31 among Fig. 9 step S21 and S25 in the process flow diagram in S35 and Fig. 6 is identical and described in a second embodiment.
Among the step S36, the code translator 50 data Es of use dish key word DK among the decoding equipment C to being received by cpu i/f B
DK(WM (ADi)) deciphers, to extract WM (ADi).Eletric watermark extraction circuit 51 extracts and is embedded among the audio data AD i and the information WM that superposes on speech data subsequently.
Behind the information of extraction WM, WM (ADi) is provided directly to MPEG-code translator 14.In this case, for the method for overlapped information WM on the speech data and on DVD1 record overlapped information WM during speech data, have following a plurality of different relation.In the following description, the arithmetical operation that is used in the stack is represented by ' * '.
(concerning 1) is adjusted to the information WM after superposeing with speech data isometric by some means, and information WM and speech data after the stack are logical ORs.
(concerning 2) uses the information WM after the stack as the coding key word speech data ADi to be encoded.
In step S37, be recorded in the E on the DVD1
DK(ADi*WM) read by a DVD driving arrangement (not showing among the figure), wherein E
DK(ADi*WM) be the back of encoding with the speech data of watermark information WM stack to be generated by use dish key word DK.By cpu i/f B, the data E that is read
DK(ADi*WM) be sent to decoding equipment C.
The data of being read from DVD1 were deciphered and error correction by code translator/error correction circuit 7 before being sent to cpu i/f B.
In step S38, the code translator 50 among the decoding equipment C uses the data E of voiced keyword DK to being received by cpu bus B
DK(ADi*WM) decipher.Overlapped information is removed circuit 53 and is extracted overlapped information, to obtain as compressed voice audio data AD i expressly.
In step S39, judge whether proceed decoding.If for being the then operation among repeated execution of steps S37 and the S38.
When speech data ADI as a result has been to use data compression standard to compress, for example be called MPEG-speech data compression standard, then data are deciphered (expansion) by MPEG-code translator 14.Data after the decoding convert simulating signal to by D/A converter 15.Simulating signal is sent to one speech amplifier/output device, and for example speaker amplifier (not expressing among the figure) is replicated then.
If desired, the overlapped information that then is embedded in the speech data can be embedded in a plurality of speech datas.
Do not need sequentially speech data ADi to be sent to MPEG-code translator 14 from decoding equipment C, but speech data can be that unit transmits with the speech data of predetermined number.
According to the copy preventing apparatus of present embodiment, electronic watermark information is embedded in the multi-medium data, and multi-medium data uses embedded electronic watermark information to decipher, thereby prevents bootlegging.
According to the copy preventing apparatus of this embodiment, coding and decoding scheme can be designed to be independent of the core partly of duplicating of DVD1 that digital recording/copying equipment for example seen from Fig. 8.Even code and eletric watermark have illegally been deciphered, but have only decoding equipment C (or encoding device A and decoding equipment C) to be replaced with another.
In above-mentioned arbitrary embodiment, can omit the cpu bus communication facilities that uses public coding key word, to obtain to be suitable for the embodiment of independent DVD player.
At last, with reference to Figure 10 the method that is used for record speech data and keyword message on DVD1 according to present embodiment a kind of is described.
In this system, when the speech data of being imported was simulated data A-voice, then the simulated data of being imported converted digital voice data D-voice to by analogue-to-digital converters, and the digital voice data after the input conversion.
Eletric watermark embeds circuit 64 and information WM is embedded in the numerical data D-voice of input first, wherein is superimposed upon on subsequently the speech data as the information WM of eletric watermark.Result data is compressed by MPEG-speech coder 63, thereby output has embedded the voice messaging WD (ADi) of eletric watermark.
By use dish key word DK, scrambler 62 generates speech data E
DK(WM (ADi)), wherein E
DK(WM (ADi)) obtains after the voice messaging WM (ADi) that has embedded eletric watermark is encoded.Speech data WM (ADi) behind the coding is recorded on the DVD61.
Embedded all when being superimposed upon information WM on the speech data when eletric watermark embeds circuit 64, switch 65 is switched by a control signal CS.Sequence number digital data D-voice are by a MPEG-speech coder 66 compression, and electronic watermark information supercircuit 67 is on the sequence number digital data D-voice of electronic watermark information WM stack (is ' * ' by symbolic representation) after compress.Speech data ADi*WM after the stack is output.
With with the identical method that the voice messaging WM (ADi) that has embedded eletric watermark is encoded, the speech data ADi*WM after the stack is encoded by use dish key word DK by scrambler 62.Speech data E behind the picture coding
DK(ADi*WM) the same, audio data AD i*WM is recorded on the DVD61.
DVD61 record is used for primary key that speech data ADi is encoded bunch to the dish key word { E that the back obtained that encodes by use
MkiAnd the DK (DK) that the dish key word is encoded and afterwards obtained by dish key word itself (DK) }.
In order to describe for simplicity, identical WM is superimposed on all speech datas after by the compression of MPEG-speech coder.Yet following improvement is with further protected data.
The the first, the second, the 3rd embodiment has independently been described.Yet, can implement different variations and modification to them.For example, can be synthesized be an embodiment to above-mentioned three embodiment.
In above-mentioned each embodiment, information recording carrier is DVD.But, the present invention for other recording medium for example CD-ROM also be suitable for.
Above-mentioned each embodiment all with speech data as the situation of wanting decoded information as example.But, the present invention for other forms of reproducing unit for example the device of view data also be suitable for.
Above-mentioned each embodiment is and will decoded information have used situation that the MPEG-voice compression compresses as example.The present invention is not limited to this.Information that will be decoded can be compressed with other standard.In this case, corresponding code translator is placed on the position of MPEG-sound decorder.Information that will be decoded also can be encoded or implement other operation.In this case, can omit the MPEG-sound decorder.
Can settle polytype code translator, with the data of output by the different mode compression.These code translators of switching that can be suitable (perhaps these code translators are basic just is not used).For example, for example read the sign that expression will be used a code translator the DVD from recording medium, and select suitable code translator according to this sign.
The layout of the code translator/decision circuit shown in first embodiment is an example, can adopt the layout of any other form.
According to the present invention, according to the eletric watermark technology, a part is embedded on the recording medium in the recorded data for correctly deciphering or duplicate the necessary information of recorded data, for example is recorded in DVD and goes up in the recorded data.Have only decoding (decoding) data that the real user that correctly deciphers the data of being sent here by different device just can be complete.
Therefore can prevent to sell the business activity of the medium of bootlegging, thereby prevent piracy.
Claims (10)
1. copy preventing apparatus comprises:
An encoding device; With
Decoding equipment by linking to each other with described encoding device,
Wherein said encoding device comprises:
First code device is used for the public coding key word by using described encoding device and described decoding equipment to share, the code-wheel key word that use dish key word itself has been encoded encoded,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described public coding key word that the code-wheel key word that uses primary key to encode is encoded,
Second conveyer is used for transmitting the code-wheel key word of having been encoded by described second code device to described decoding equipment,
The 3rd code device is used for by using described public coding key word that multi-medium data is encoded, and wherein electronic watermark information embeds as the form of the part of described primary key in multi-medium data,
The 3rd conveyer, be used for to described decoding equipment transmit the multi-medium data of having encoded by described the 3rd code device and
The 4th conveyer is used to transmit and has used the multi-medium data of having been encoded by described dish key word, and
Described code translator comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
The 3rd code translator is used to use public coding key word that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting described watermark information from the multi-medium data of being deciphered by described the 3rd code translator,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by watermark information that described draw-out device extracted with corresponding to the part primary key of the part of described primary key, obtain the dish key word and
The 4th code translator is used for by using the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 4th conveyer is deciphered.
2. copy preventing apparatus according to claim 1, wherein said dish key word deriving means comprises:
First deriving means is used for obtaining the primary key candidate on the basis of described part primary key and described watermark information,
Second deriving means is used for obtaining the first dish key word candidate by using the primary key candidate that obtained by described first deriving means that the dish key word of having been deciphered by described second code translator is deciphered;
The 3rd deriving means is used for obtaining the second dish key word candidate by using the first dish key word candidate that obtained by described second deriving means that the dish key word of having been deciphered by described first code translator is deciphered;
Decision maker is used to judge whether the first dish key word candidate that is obtained by described second deriving means is consistent with the second dish key word candidate that is obtained by described the 3rd deriving means; With
Determination device is used for when judging that when described decision maker the first dish key word candidate is consistent with the second dish key word candidate, and decision is coiled the key word candidate to described first as the dish key word.
3. device according to claim 1, wherein said multi-medium data are the speech data that compressed according to mpeg standard.
4. device according to claim 1 also comprises the 5th code translator, is used for according to the MPBG rule multi-medium data of having been deciphered by described the 4th code translator being deciphered.
5. copy preventing apparatus comprises:
An encoding device; With
A decoding equipment that links to each other with described encoding device to described code translator,
Wherein said encoding device comprises:
First code device is used for encoding by the dish key word that uses between described encoding device and described decoding equipment the coding that the public coding key word shared itself encoded to use dish key word,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described public coding key word that the dish key word of the coding that uses primary key and encoded is encoded,
Second conveyer is used for transmitting the dish key word of having been encoded by described second code device to described decoding equipment,
The 3rd conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and in multi-medium data electronic watermark information embed as the form of the part of described primary key and
The 4th conveyer is used to transmit the multi-medium data that use dish key word and watermark information have been encoded, and
Described decoding equipment comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by the watermark information that described draw-out device extracted, with obtain corresponding to the part primary key of the part of described primary key the dish key word and
The 3rd code translator is used to use the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting electronic watermark information from the multi-medium data of being deciphered by described the 3rd code translator,
The 4th code translator is used on the basis by electronic watermark information that described draw-out device extracted and the dish key word that obtained by described dish key word deriving means the multi-medium data that is sent by described the 4th conveyer being deciphered.
6. device according to claim 5, wherein multi-medium data is the speech data according to the mpeg standard compression.
7. device according to claim 5 also comprises the 5th code translator, is used for according to the MPEG rule multi-medium data of having been deciphered by described the 4th code translator being deciphered.
8. a copy preventing apparatus comprises:
An encoding device; With
A decoding equipment that links to each other with described encoding device to described code translator,
Wherein encoding device comprises:
First code device is used for encoding by the key word of code-wheel that uses the common code key word shared between described encoding device and the described decoding equipment that use dish key word itself has been encoded,
First conveyer is used for transmitting the dish key word of having been encoded by described first code device to described decoding equipment,
Second code device is used for by using described common code key word that the dish key word that uses primary key to encode is encoded,
Second conveyer is used for transmitting the dish key word of having been encoded by described second code device to described decoding equipment,
The 3rd conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and in multi-medium data electronic watermark information embed as the form of the part of described primary key and
The 4th conveyer is used for transmitting the multi-medium data of having been encoded by the dish key word to described decoding equipment, and electronic watermark information is superimposed upon on the multi-medium data, and
Described code translator comprises:
First code translator is used to use described public coding key word that the dish key word that is sent by described first conveyer is deciphered,
Second code translator is used to use described public coding key word that the dish key word that is sent by described second conveyer is deciphered,
Dish key word deriving means, be used for the dish key word that basis is deciphered by described first code translator, the dish key word of deciphering by described second code translator, by the watermark information that described draw-out device extracted, with obtain corresponding to the part primary key of the part of described primary key the dish key word and
The 3rd code translator is used to use the dish key word that is obtained by described dish key word deriving means that the multi-medium data that is sent by described the 3rd conveyer is deciphered,
Draw-out device is used for extracting electronic watermark information from the multi-medium data of having been deciphered by described the 3rd code translator,
The 4th code translator, be used to use the dish key word that obtained by described dish key word deriving means to send by described the 4th conveyer that multi-medium data is deciphered and
The 5th code translator is used to use the electronic watermark information that extracted by described draw-out device that the multi-medium data of having been deciphered by described the 4th code translator is deciphered.
9. device according to claim 8, wherein multi-medium data is the speech data according to the mpeg standard compression.
10. device according to claim 8 also comprises the 5th code translator, is used for according to the MPEG rule multi-medium data of having been deciphered by described the 4th code translator being deciphered.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP361980/97 | 1997-11-20 | ||
| JP36198097 | 1997-11-20 | ||
| JP361980/1997 | 1997-11-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1220459A CN1220459A (en) | 1999-06-23 |
| CN1134003C true CN1134003C (en) | 2004-01-07 |
Family
ID=18475503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981225446A Expired - Fee Related CN1134003C (en) | 1997-11-20 | 1998-11-20 | Copy preventing apparatus and information recording medium used in this copy preventing apparatus |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100279523B1 (en) |
| CN (1) | CN1134003C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3979350B2 (en) * | 2003-06-24 | 2007-09-19 | ソニー株式会社 | Information recording medium drive apparatus, information processing apparatus, data reproduction control system and method, and computer program |
| KR100994772B1 (en) | 2004-01-10 | 2010-11-16 | 삼성전자주식회사 | Method for copying and reproducing the data of storage medium |
| US7920713B2 (en) * | 2004-12-20 | 2011-04-05 | Lsi Corporation | Recorded video broadcast, streaming, download, and disk distribution with watermarking instructions |
| KR100965888B1 (en) * | 2008-02-19 | 2010-06-24 | 삼성전자주식회사 | Method for recording or providing contents and apparatus thereof |
-
1998
- 1998-11-20 CN CNB981225446A patent/CN1134003C/en not_active Expired - Fee Related
- 1998-11-20 KR KR1019980049893A patent/KR100279523B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1220459A (en) | 1999-06-23 |
| KR19990045452A (en) | 1999-06-25 |
| KR100279523B1 (en) | 2001-03-02 |
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