CN102890756A - Media content generating method and device and media content playing method and device - Google Patents

Media content generating method and device and media content playing method and device Download PDF

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CN102890756A
CN102890756A CN 201110209439 CN201110209439A CN102890756A CN 102890756 A CN102890756 A CN 102890756A CN 201110209439 CN201110209439 CN 201110209439 CN 201110209439 A CN201110209439 A CN 201110209439A CN 102890756 A CN102890756 A CN 102890756A
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media content
fragment
symbol
word
watermark
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刘芬
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Sony Corp
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Sony Corp
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Abstract

The invention relates to an anti-piracy media content generating method and a device as well as a media content playing method and a device. The media content generating method comprises the following steps of respectively embedding at least one watermarking information into each of any selected m segments in an original media content so as to conveniently form at least one watermarked duplicate for each segment, embedding q watermarking information into each of d continuous segments in m segments so as to conveniently form q watermarked duplicates for each segment, establishing an error correction code corresponding to the original media content through an error correction code symbol corresponding to the watermarking information of all segments, determining the error correction code according to any d continuous code symbols contained in the error correction code, wherein m, d and q are respectively of an integer which is more than or equal to 2, and d is smaller than m; encrypting all watermarked duplicates of m segments so as to generate a media content with an anti-piracy characteristic; and storing a correspondence relation among the watermarking information, the error correction code symbol and an encryption key. Due to the adoption of the media content generating method and the device and the media content playing method and the device, the efficiency and precision for the piracy detection can be improved.

Description

Standby method and apparatus, the media content playing method and device of generating of media content
Technical field
The technical field of relate generally to media contents management of the present invention, more specifically relate to the treatment technology to generation and the broadcast of media content, especially relate to the media content that designs in order to tackle pirate media content and generate method and apparatus, and the media content playing method and device.
Background technology
In recent years, along with the rise of information technology revolution and flourish, produced various forms of media contents, for example, film, audio frequency, video, picture, rest image, animation, PPV, VoD etc.For the author of protecting media content and legal authorization user's interests, need to stop the media content (that is, piracy) of unauthorized copying normally to be used, for example normal play.Also namely, need the development anti-piracy technique.
Existing anti-piracy technique totally can be divided into two large classes, one class is based on bootlegger's tracer technique and revocation mechanism, usually adopt digital watermark technology, come tracing pirates by the digital watermarking that is embedded in the content, and bootlegger's key cancelled from system, make the bootlegger can't decipher the CD content of new broadcasting, thereby realize preventing piracy.If its bootlegger's tracking mechanism is also comprehensive tracing pirates accurately, such as, non-bootlegger is identified as the bootlegger, perhaps, can only identify the bootlegger of fraction, this technology can't realize preventing piracy.Another kind ofly be based on content verification, before play content, such technology is carried out tight authentication to player and content, and if the verification passes, content is decrypted and play, otherwise stops the broadcast of content.The support that needs central server that has in this class technology, the special safe key of some needs is used for content verification.The anti-piracy ability of this class technology depends on the reliability of content verification process.
At present, based on the anti-piracy technique of bootlegger's tracer technique and revocation mechanism, its representative technology is AACS (Advanced Access Content System, the advanced access content system) technology that is widely used in HD DVD and Blu-ray Disc.The AACS technology comprises that contents distribution and bootlegger follow the trail of two parts, and the bootlegger follows the trail of part and is responsible for according to the watermark information tracing pirates in the pirate content, in case track the bootlegger, system cancels bootlegger's key in the contents distribution stage.In the contents distribution stage, CD content is extracted out some fragments, (digital watermark technology is to embed hidden mark in digital content to each fragment by embedding the different variable of different digital watermarking generations, this mark is normally sightless, only has the testing tool by special use to extract.Digital watermarking can be used for the copyright protection of picture, music and film; in the situation that substantially do not damage the original works quality; the copyright relevant information is hidden in the content; and vision or the sense of hearing of the variation that produces by the people can't find); the encrypted rear distribution of these variablees, different user keys can only be deciphered wherein some variablees.In case find piracy, special-purpose checkout equipment can track by the digital watermarking in the detection of gangs deciphering and generate this pirate key, i.e. bootlegger.In case track the bootlegger, by in CD, embedding MKB (the Media Key Block of " NNL tree " binary tree structure by name, key media key block), system can upgrade MKB, it is invalid that the key that the bootlegger that tracks is used becomes, and the MKB after will upgrading be embedded into after in the CD of volume production, this terminal can't be carried out correct decoding to encrypted content again, thereby prevent piracy.
Yet, the trace ability that studies show that AACS bootlegger's tracking mechanism is very limited, 20 users' conspiracy just can be escaped the tracking mechanism of AACS, namely 20 users conspire to make tracking mechanism always track a not guilty user, and 34 users' conspiracy almost can be frame the not guilty user of any one appointment, namely always track an an innocent person's user with the tracking mechanism of AACS, as seen, false drop rate is quite high, its bootlegger's tracking mechanism can't be accurately and comprehensive identification bootlegger, prevents piracy so this technology can't be strong.
The customer volume that the broadcast mode of disk medium is faced is very huge, so that bootlegger's tracer technique is accurate and comprehensively the identification bootlegger is very difficult, so, if can detect pirate content and stop pirate broadcast, also can effectively prevent piracy, the anti-piracy technique of the content-based checking of Equations of The Second Kind is to be conceived to verify whether CD content is pirate.
Namely be based on the anti-piracy technique of content verification for the protection of the HDCP technology of high-definition content copyright.Take computer platform as example; the data content that is subject to the HDCP technical protection can be driven by the COPP in the operating system (authentication output protection agreement) and at first verify video card when output; only have legal video card could realize content output; to authenticate subsequently the key of display device, only meet the final content that shows that video card sends of equipment ability that HDCP requires.In the HDCP transmission course, transmitting terminal and receiving end are all stored an available key collection, these keys all are secure stores, transmitting terminal and receiving end all are encrypted decrypt operation according to key, also to add a special value KSV (video-encryption key) in such computing, each equipment of HDCP has a unique KSV sequence number simultaneously, and the cryptography processing units of transmitting terminal and receiving end can be checked the other side's KSV value, is legal to guarantee to connect.The ciphering process of HDCP can be processed each pixel so that picture become have no rule, None-identified, only have transmitting terminal and receiving end after confirming synchronously just may carry out reverse process, finish the reduction of data.In decrypting process, the HDCP system can per 2 seconds once connect affirmation, and per 128 frame pictures carry out transmitting terminal and the synchronous identification code of receiving end simultaneously, guarantee to connect synchronously.
As seen, the content verification process of HDCP technology depends on by force the security of the synchronous and key set between transmitting terminal and the receiving end.Keeping synchronous frequent communication between transmitting terminal and the receiving end makes system busy and fragile.In addition, September in 2010, the encryption main key of HDCP on the 13rd was revealed on network, the HDCP master key that Intel spokesman Tom Waldrop confirm to have flowed out on September 16th, 2010 has been genuine, and thinks that the hacker can be with the master key of this leakage Blu-ray Disc of decoding.
In order to tackle the situation of Key Exposure, HDCP has set up " cancelling key " mechanism especially.The key set KSV value of each equipment is unique, and the HDCP system can compare in revocation list and search after receive the KSV value, and the KSV that appears in the tabulation will be considered to illegally cause the failure of verification process.The cipher key list of cancelling here is included in multi-medium data corresponding to HDCP and will automatically upgrades.But HDCP does not have bootlegger's trace ability, and it " cancels key ", and mechanism is to be similar to directly cancelling of blacklist, is different from the revocation mechanism based on bootlegger's tracer technique, can't initiatively effectively find the key of being revealed.
Other has a kind of anti-piracy encryption method (the open No.CN1215867 of Chinese patent application) also to be based on the anti-piracy technique of content verification; the method is the anti-piracy technique for optical disk of software, utilizes the online feedback formula copyright authentication of authentication center to realize anti-piracy encipherment protection to software.Its proof procedure is simpler than HDCP, do not need to keep the real-time synchronization of transmitting terminal and receiving end, the similar simple identity authentication protocol of process, but the method needs the online support of an authentication center, and this is very unpractical for CDs hundreds of millions of in the market, if every CD all needed the connectivity verification center to verify before using, authentication center will become access bottleneck, and obviously, this technology can't be tackled the single point failure of authentication center.
To sum up, existing two class anti-piracy techniques, a class is conceived to tracing pirates and cancels bootlegger's key from system, thereby plays anti-piracy effect.Yet this class technology is because of the high fallout ratio of its tracking mechanism, and anti-piracy ability is very limited.So the researcher proposes the anti-piracy technique that Equations of The Second Kind is conceived to content verification, stop to play the content that checking is not passed through, thereby play anti-piracy effect.But the support that needs central server that this current Equations of The Second Kind technology has can't be tackled the single point failure of authentication center, and what have exists the Key Exposure problem.
Summary of the invention
In view of the situation of above-mentioned prior art, embodiments of the invention provide a kind of simple anti-pirate media contents management method and apparatus that is used for efficiently.
It is a kind of for anti-pirate media content generation method that embodiments of the invention provide, comprise: from original media content, select arbitrarily m fragment, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, in the wherein said m fragment in continuous d the fragment each is embedded into q watermark information, in order to be q band of each fragment formation watermark copy in d the fragment, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all m fragment, wherein, the error correction code word can be by comprising in this error correction code word, the d corresponding with a described continuous d fragment continuous code-word symbol is determined, m, d and q are the positive integers more than or equal to 2, and d is less than or equal to m; Utilize different encryption keys to be encrypted all of a described m fragment with the watermark copy, in order to generate the media content with anti-pirate characteristic; And, corresponding relation between storage watermark information, error correcting code symbol and the encryption key, to be used for when media content is play, the determining legal error correction code word relevant with legal broadcaster, the formation component that wherein said legal error correction code word is described error correction code word.
It is a kind of for anti-pirate media content generating apparatus that embodiments of the invention also provide, comprise: the watermark embedded unit, it is configured to select arbitrarily m fragment from original media content, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein be that in d the fragment continuous in the described m fragment each embeds q watermark information, in order to be q band of each fragment formation watermark copy in d the fragment, utilize respectively different encryption keys to be encrypted all of a described m fragment with the watermark copy, in order to generate the media content with anti-pirate characteristic, wherein, m, d and q are the positive integers more than or equal to 2, and d is less than or equal to m; And, correspondence relation storage, it is configured to store the corresponding relation between watermark information, error correcting code symbol and the encryption key, to be used for the determining legal error correction code word relevant with legal broadcaster when media content is play.Wherein, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all m fragment, the error correction code word can be determined the formation component that described legal error correction code word is described error correction code word by that comprise in the described error correction code word, corresponding with a described continuous d fragment d continuous code-word symbol.
It is a kind of for anti-pirate media content player method that embodiments of the invention provide again, comprise: from media content, extract m with continuous d embedded in watermark fragment watermark information, wherein d and m are the positive integers more than or equal to 2, and m is more than or equal to d; According to the predetermined corresponding relation between watermark information and the error correcting code symbol, obtain continuous d the error correcting code symbol corresponding with described continuous d watermark information, and the individual continuous error correcting code symbol of the d that passes through to obtain generates legal error correction code word; And, from described m with other watermark informations that extract the watermark fragment except described continuous d watermark information, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated, and according to matching result described media content are processed.
It is a kind of for anti-pirate media content playing device that the embodiment of the invention provides again, comprise: legal error correction code word generation unit, it is configured to extract m with continuous d embedded in watermark fragment watermark information from media content, according to the predetermined corresponding relation between watermark information and the error correcting code symbol, obtain continuous d the error correcting code symbol corresponding with described continuous d watermark information, and the d that passes through to obtain continuous error correcting code symbol generates legal error correction code word, wherein d and m are the positive integers more than or equal to 2, and m is more than or equal to d; And, coupling checking broadcast unit, it is configured to from described m with other watermark informations that extract the watermark fragment except described continuous d watermark information, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated, and according to matching result described media content are processed.
The embodiment of the invention also provides a kind of playback equipment that can prevent from playing pirate media content, and it comprises such as the above-mentioned anti-pirate media content playing device that is used for according to the embodiment of the invention.
The embodiment of the invention also provides a kind of advanced access content system AACS that can prevent from playing pirate media content, and it comprises such as the above-mentioned anti-pirate media content playing device that is used for according to the embodiment of the invention.
According to the embodiment of the invention, a kind of program product that stores the instruction code that machine readable gets also is provided, when described instruction code is read and carried out by machine, can carry out above-mentioned anti-pirate media content generation method and the media content player method of being used for according to the embodiment of the invention.
According to the embodiment of the invention, a kind of storage medium also is provided, it carries the instruction code that machine readable is got, and when described instruction code is read and carried out by machine, can carry out above-mentioned anti-pirate media content generation method and the media content player method of being used for according to the embodiment of the invention.
By above-mentioned method and apparatus according to the embodiment of the invention, provide and to have improved the pirate efficient that detects and the anti-pirate media contents management technology of accuracy.In addition, this technology can also reduce system complexity and process load.
Provide the various specific implementations of the embodiment of the invention in the instructions part below, wherein, describe the preferred embodiment that is used for disclosing fully the embodiment of the invention in detail, and it is not applied restriction.
Description of drawings
In conjunction with the drawings to the description of the specific embodiment of the present invention, of the present inventionly above will become clear with other purpose, characteristics and advantage.In each accompanying drawing, same or similar Reference numeral represents identical or similar functional part or step.In the accompanying drawings:
Fig. 1 is the general flow chart that is used for anti-pirate media content generation method according to the embodiment of the invention;
Fig. 2 is the schematic diagram that the corresponding relation between error correcting code symbol corresponding to the encryption key of each copy, each copy in the fragment that is embedded into watermark information of media content and this fragment is shown;
Fig. 3 is the general flow chart that is used for anti-pirate media content player method according to the embodiment of the invention;
Fig. 4 shows the exemplary configuration structure of the media content that generates by the media content generation method that is used for fighting against piracy according to the embodiment of the invention;
Fig. 5 is the schematic diagram that illustrates according to form the media content version in the media content player method of the embodiment of the invention for each broadcaster;
Fig. 6 is the process flow diagram of an object lesson that the media content player method of Fig. 3 is shown;
Fig. 7 is the schematic diagram that illustrates according to the technique effect that is used for anti-pirate media content player method of the embodiment of the invention;
Fig. 8 is the designs simplification block diagram that is used for anti-pirate media content generating apparatus according to the embodiment of the invention;
Fig. 9 is the designs simplification block diagram that is used for anti-pirate media content playing device according to the embodiment of the invention;
Figure 10 is the designs simplification block diagram that an object lesson of the content reproduction device among Fig. 9 is shown;
Figure 11 is the designs simplification block diagram that another object lesson of the content reproduction device among Fig. 9 is shown;
Figure 12 is the designs simplification block diagram that another object lesson of the content reproduction device among Fig. 9 is shown;
Figure 13 comprises designs simplification block diagram for the media content playback equipment of anti-pirate media content playing device according to the embodiment of the invention; And
Figure 14 is as the block diagram of the exemplary configurations of the personal computer of adoptable messaging device in the embodiments of the invention.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.Should be noted that for fear of having blured the present invention because of unnecessary details, only show in the accompanying drawings with according to the closely-related device structure of embodiment of the present invention and/or treatment step, and omitted other details little with relation of the present invention.Constitution Elements or part identical or similar in each accompanying drawing utilize identical or similar Reference numeral to represent.
Fig. 1 is the general flow chart that is used for anti-pirate media content generation method 100 according to the embodiment of the invention.As shown in Figure 1, method 100 starts from step S110.At step S120, from original media content, select arbitrarily m fragment, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein each in continuous d the fragment is embedded into q watermark information in this m fragment, in order to be that each fragment in d the fragment forms q and is with the watermark copy.Consist of the error correction code word corresponding with original media content by the error correcting code symbol corresponding with the watermark information of all m fragment.Wherein, the error correction code word can be determined by that comprise in this error correction code word, corresponding with d continuous fragment d continuous code-word symbol, m, and d and q are the positive integers more than or equal to 2, and d is less than or equal to m.At step S130, utilize respectively different encryption keys that all band watermark copies of an above-mentioned m fragment are encrypted, in order to generate the media content with anti-pirate characteristic.At step S140, corresponding relation between storage watermark information, error correcting code symbol and the encryption key, to be used for when media content is play, the determining legal error correction code word relevant with legal broadcaster, the legal error correction code word formation component that is the error correction code word wherein.
To need explanation at this, in the following description, in order knowing for purpose of brevity, only to describe with the example of video as media content.But those skilled in the art understand, and processing described here and process are applicable to other various forms of media contents too, for example, and audio frequency, picture, rest image, animation, PPV, VoD, etc.
Below in conjunction with Fig. 2, provide an object lesson and describe above-mentioned this implementation procedure for anti-pirate media content generation method according to the embodiment of the invention in detail.
Fig. 2 shows the corresponding relation between error correcting code symbol corresponding to the encryption key of each copy, each copy in the fragment that is embedded into watermark information of media content in this example and this fragment.
Select arbitrarily m fragment from media content, for each fragment embeds at least one watermark information in order to generate at least one with the copy of watermark for this fragment.It is noted that at this selection of m fragment is arbitrarily, both can be m continuous in media content fragment, also can be a discontinuous m fragment, that is, as required, a selected m fragment can be distributed in any position of media content.In a kind of possible embodiment, for example can select content comparatively excellent in the media content as a selected m fragment.Then, each fragment for d continuous in selected this any m fragment fragment embeds q watermark information in order to be q copy with watermark of this fragment generation.Fig. 2 has provided wherein the processing for i fragment among this d d continuous fragment.I fragment Vi obtains q with the copy q of watermark after being embedded into q watermark information (not shown) I1, q I2..., q IqUtilize encryption key k I1, k I2..., k IqCome each band watermark copy is encrypted.As shown in the figure, encryption key and with satisfying predetermined corresponding relation between the watermark copy.Because each forms by embedding watermark information with the watermark copy, therefore with being mutually corresponding between watermark copy and the watermark information.Thus, also exist similarly definite corresponding relation between encryption key and the watermark information.In the example shown in Fig. 2, the above-mentioned predetermined corresponding relation with between watermark copy and the watermark information is man-to-man relation.In addition, the content for selected this any m fragment of media content arranges an error correction code word C (m, q, d).Following table 1 has provided the ios dhcp sample configuration IOS DHCP of this error correction code word.
Table 1
Figure BSA00000544674000081
As shown in table 1, the length of code word C is m, namely comprises m code-word symbol c 1, c 2..., c mEach code-word symbol can have multiple different value, and example is as shown in table 1, code-word symbol c 1-c dIn each the different value of q kind can be arranged, and in all the other code-word symbol each can have respectively g 1..., g M-dPlant different values, g 1..., g M-dFor example can be all less than q.The dimension of this code word C is d, that is to say, it is independently that d code-word symbol arranged among the code word C, and independently d code-word symbol just can be in the hope of whole m code-word symbol by this, and d is less than or equal to m.In the example shown in the table 1, d continuous code-word symbol c 1-c dHave respectively the different value of q kind, for example, code-word symbol ci can have q kind value c I1, c I2..., c IqLike this, so that code word C has q dPlant possible code-word symbol combination, in the following description such code-word symbol is combined into " legal error correction code word ".This also just means can support q dIndividual legal broadcaster, each legal broadcaster have the legal error correction code word corresponding with it, and this legal error correction code word will be for detect this media content whether pirate (back will be described in detail) when playing the coal body content.Certainly, easily understand, depend on concrete application, but in other alternative embodiments, code-word symbol c D+1-c mAlso can have equally respectively the different value of q kind, for example, if need to support q mIndividual legal broadcaster's words.
As shown in Figure 2, with regard to media content segments Vi, so that its q encrypts by an encryption key with in the watermark copy each, and each is with distinguishing corresponding with the q kind value of the corresponding code-word symbol of fragment Vi among watermark copy and the error correction code word C.For example, in Fig. 3, such corresponding relation comprises:
Figure BSA00000544674000091
Figure BSA00000544674000092
Etc..Because each band watermark copy has been embedded into a watermark information, therefore above-mentioned this corresponding relation also is present in encryption key, watermark information and the code-word symbol similarly.
Above-mentioned corresponding relation is preserved, determined the legal error correction code word relevant with the broadcaster when played for follow-up piracy preventing media content.
Only provided the processing for a fragment in selected m the fragment of media content among Fig. 2.All m fragment is carried out similar processing, so, can obtain and preserve m group corresponding relation m fragment, watermark information, error correcting code symbol and encryption key.All m code-word symbol for m fragment setting has consisted of the error correction code word C corresponding with media content, if code word C comprises independently code-word symbol of d, and each independently code-word symbol have the different values of q kind, then code word C can have q altogether dPlant possible code-word symbol combination, that is, and q dIndividual " legal error correction code word ".As seen, consist of error correction code word C by all legal error correction code words, thereby legal error correction code word can be called be the formation component of error correction code word C.As will be described below, legal error correction code word is used for determining whether media content is pirate.
Easily understand, for in other fragments except a continuous d fragment in m the fragment each, can form and be less than q band watermark copy, these can be corresponding from the different values (as mentioned above, less than q kind value) of corresponding code-word symbol among the error correction code word C with the watermark copy.Certainly, but in a kind of embodiment of alternative, for the ease of commercial production, also can also form in other fragments each q band watermark copy.In this case, some copy is " unnecessary ", that is, and and will can be not decrypted by utilizing error correction code word C to come that media content is detected when playing these copies, thereby can not extract watermark information, just can not correspond to concrete code-word symbol among the error correction code word C yet.The processing that will describe in detail from behind will understand that, this situation can't affect to be play the detection of media content, because independently d code-word symbol is irrelevant in these unnecessary copies and the watermark information that wherein comprises and the error correction code word, so for obtaining the not contribution of legal error correction code word.
Media content through above-mentioned such processing; can normally be play by the media content that error correction code word C is detected accordingly and process to forbid to generate through unauthorized ways (for example by conspiring the pirate media content that obtains); and do not need to detect or locate pirate duplicator or distributor be who (following will the detailed description in detail), can effectively protect thus media content author or legal user's interests.
Can carry out above-mentioned media content to a part of selecting in the original media content and generate and process, but according to actual needs, also can carry out this processing to original media content whole.
In one embodiment, error correction code word C also can be nested to form, i.e. each code-word symbol that error correction code word C comprises itself is exactly a code word.Because single code word can be carried more quantity of information than single code-word symbol, therefore use the nested type code word can reduce amount of redundant information.
Aspect the selection of watermark information, each fragment with watermark information embedded in the watermark copy for example can be with this with error correcting code corresponding to watermark copy itself, for example, the error correcting code symbol c shown in Fig. 2 I1, c I2... wait itself just to can be used as watermark information and be embedded into.Perhaps, the watermark information that is embedded into can be other information that are associated with this error correcting code symbol, for example, and temporal information, location information that the presentation medium content produces, etc.This shows, the selection degree of freedom of watermark information is larger.
For the employed technology of embed watermark information, can use any existing or robust watermark technology (robust watermark, also, watermark is difficult for removing the digital watermark that the ability of anti-destruction is stronger) that may develop in the future.In addition, can not generate other band watermark copy by any band watermark copy.That is to say the band watermark copy that can not be obtained being left with any several derivations in the watermark copy by q.Because embed watermark need to be determined the content of watermark and the position of embedding, so the said band watermark copy that can not derive and obtain being left here mainly refers to derive simultaneously content and the position of remaining watermark.At present most known digital watermarks all meet this requirement.For example, the open No.CN1396569 of Chinese patent application (denomination of invention: " a kind of method for add and extract digital watermarking to data image signal ") has provided an object lesson of this digital watermark.
About employed error correction code word in the management processing that media content is fought against piracy according to the embodiment of the invention, need the error correction code word to satisfy following condition: (error correcting capability to the error correction code word does not require)
1) the message figure place is little (the smaller the better, be that d is the smaller the better), d is smaller just so that each segments that only need to read in seldom just can generate complete legal-code, thereby can judge whether piracy (back will be described in detail) of current pending media content by means of the complete legal-code that generates.Like this can be as much as possible little to the processing load of system.Certainly, easily understand, if the computing power of system is unrestricted, then this condition only be an optimum condition and and nonessential satisfied condition.
2) by d code word that continuous symbol can regain one's integrity arbitrarily in the code word, also, there be independently d code-word symbol in the code word.
For example, cyclic redundancy check (CRC) code (CRC code) just simultaneously all satisfies above two conditions, can be used as code word and chooses object.The CRC code comprises BCH code (Bose, Ray-Chaudhuri, Hocquenghem Code, a plurality of random error pattern correction codings), Read-Solomon (Reed-Solomon) RS code is a kind of of BCH code, accordingly, can select the RS code as error correcting code, because its information digit is all very little.In addition, but as the alternative scheme, also can use Golay code (Golay), it also is a kind of of BCH code.Certainly, do not get rid of at this and to use any other code that meets above-mentioned requirements known or that develop in the future, as employed error correction code word in the management processing that media content is fought against piracy of the embodiment of the invention.
If use the RS code, then it comprises m code-word symbol, and wherein each code-word symbol in the continuous d code-word symbol has the different value of q kind, and the RS dimension of codes is d, that is, and and can be in the hope of this complete RS code by d code-word symbol.The m of a RS code code-word symbol is corresponding one by one with m fragment of media content, meets the above-mentioned error correcting code symbol of storing and the corresponding relation between the watermark information between the watermark information that embeds in the different value that each code-word symbol the has fragment corresponding with this code-word symbol.
The below lifts a concrete example application.Suppose to adopt error correction code word C (15,16,2) as the error correction code word (that is, m=15, q=16, d=2) corresponding with media content.Original media content is the video that comprises 1000 frames, and each 20 frame is as a fragment, and then this media content comprises 50 fragments altogether.From these 50 fragments, select arbitrarily 15 fragments.For example, if select front 15 fragments, then the frame number of each fragment is 1,21,41,61,81,101,121,141,161,181,201,221,241,261,281.Certainly, the selection of fragment is arbitrarily, must not start anew to select, and the position of selected fragment in media content also is arbitrarily.In this example, for each fragment, 16 watermark informations are embedded in 20 frames in this fragment, then correspondingly, can obtain 16 band watermark copies or the copy of this fragment.Utilize different encryption keys that these band watermark copies are encrypted.The media content that generates through this processing possesses anti-pirate characteristic (below will describe in detail).Aforesaid, be each fragment in 15 fragments all form 16 band watermark copies can more convenient commercial production.In fact, in order to generate for anti-pirate media content, only need to for error correction code word C (15,16,2) in independently 22 continuous fragments corresponding to code-word symbol respectively generate 16 band watermark copies then it is enough, be that the band watermark copy that all the other fragments generate in 15 fragments can be less than 16.
It is noted that each the design parameter value in the above-mentioned example all is for convenience of description, do not consist of the restriction to the embodiment of the invention.
So far, described how original media content is managed to generate the media content that can fight against piracy.The below will illustrate how the media content of such generation is processed in order to realize anti-pirate Play Control.
Fig. 3 is the general flow chart that is used for anti-pirate media content player method 300 according to the embodiment of the invention.As shown in Figure 3, the method starts from S310.At step S320, from media content, extract m with continuous d embedded in watermark fragment watermark information, wherein d and m are the positive integers more than or equal to 2, and m is more than or equal to d.At step S330, the predetermined corresponding relation according between watermark information and the error correcting code symbol obtains continuous d the error correcting code symbol corresponding with d continuous watermark information, and the d that passes through to obtain continuous error correcting code symbol generates legal error correction code word.At step S340, from individual other watermark informations with extracting the watermark fragment except a continuous d watermark information of above-mentioned m, error correcting code symbol and legal error correction code word that will be corresponding with other watermark informations be mated, and according to matching result described media content are processed.
At this, the processing of described coal body content being carried out according to matching result for example can comprise: in the situation that matching result indication media content is pirate this media content of forbidding playing; Perhaps, in the situation that matching result indication media content is not pirate this media content of normal play that allows.Wherein, " forbidding " plays and for example can comprise two kinds of situations, and the first is in the situation that frontier inspection is surveyed the limit plays, if to detect media content be piracy then stop to continue to detect and play; It two is in the situation of formerly unifying to detect and then play, if to detect media content be piracy then will not play this media content.By such processing, only just can obtain complete legal error correction code word by means of detecting the code-word symbol of seldom counting in the media content, and can forbid pirate broadcast based on detected code-word symbol and the match condition of this legal error correction code word, thereby efficient and the accuracy of anti-pirate Play Control have greatly been improved.In addition, the computation complexity of related system is also very low.
In a kind of concrete implementation of this anti-pirate media content player method, above-mentioned media content is for example processed by the media contents management method of describing by means of above-mentioned Fig. 1-2.To note, in order describing for purpose of brevity, to think here in m the fragment each fragment to form q to be with the watermark copy be that example is described, as mentioned above, this mode can be so that commercial production, but embodiments of the invention are not limited to this.Fig. 4 has provided the illustrative arrangement structure of an example of this media content.As shown in Figure 4, in the m of media content the band watermark fragment, each fragment comprises that q is embedded into watermark information and encrypted copy.For this media content is provided with corresponding error correction code word C (m, q, d).Between with watermark copy, encryption key and error correcting code symbol, there is predetermined corresponding relation (for example as shown in Figure 2), and correspondingly, be embedded into and also have similarly predetermined corresponding relation between watermark information, encryption key and the error correcting code symbol in the copy.
As d of the extraction media content of step S320 among a Fig. 3 continuous example of the processing of watermark information, can for continuous d fragment, encrypted band watermark copy in the media content m fragment, utilize corresponding decruption key to be decrypted to obtain continuous d the band watermark copy corresponding with a continuous d fragment.Extract this continuous d with the watermark information that embeds in the watermark copy, and obtain d continuous error correcting code symbol according to the corresponding relation between watermark information and the error correcting code symbol.Can adopt any suitable watermark extraction technique to extract d with the watermark information in the watermark copy, the watermark extraction technique that for example provides among the open No.CN1396569 of above-mentioned Chinese patent application.Need to prove, the technology of embed watermark information is in correspondence with each other when watermark extraction technique and generating media content, and this watermark embedded technology is transparent for the broadcaster, so the broadcaster knows when carrying out the broadcast of media content and should extract watermark information with which kind of watermark extraction technique.
Fig. 5 schematically shows in media content playing process that media content is as shown in Figure 4 fought against piracy, and the media content copy is decrypted processes in order to form the media content version for each legal broadcaster.As shown in Figure 5, suppose the playback process that certain legal broadcaster fights against piracy to this media content, the decruption key of distributing to this legal broadcaster is key subset K (k I3..., k J2... k Mq).This decruption key is used for the respective copies that media content m fragment encrypted through aforementioned encryption key is decrypted.In this example, encryption key is identical with decruption key, but, those skilled in the art understand, encryption key needs not to be identical with decruption key, as long as the corresponding relation between encryption key and the decruption key is informed the broadcaster, so that it can come the copy deciphering through encryption keys is got final product by decruption key when playing media content.
In Fig. 6, each copy of being deciphered by legal broadcaster is respectively q I3..., q J2..., q Mq, the media content segments that is formed by these decrypted copies is combined in this and can be described as corresponding with this legal playback equipment " version (version) ".As mentioned above, can extract embedded watermark information in each the decrypted copy from this broadcaster's version.
The legal error correction code word generation processing of step S330 among Fig. 3 is then described.For example, suppose when generating media content for the error correction code word of its setting it is C (m, q, d), then by the qualified d of an input code-word symbol, continuous d the code-word symbol that for example obtains among the above-mentioned steps S320 just can generate the complete legal error correction code word that contains m code-word symbol.Here the RS code take parameter as (m, d) is example:
1) RS code computing in galois field (GF, Galois Field), the calculating of RS code is exactly at GF (2 m) calculating information code symbol polynomial expression M (x) in the territory divided by check code generator polynomial G (x) remainder afterwards, a is territory GF (2 m) in primitive element.
2) polynomial coefficient namely is code-word symbol, that is, if the information code-word symbol is m D-1, m D-2... m 0, information code symbol polynomial expression is M (x)=m so D-1x D-1+ ...+m 1X+m 0
3) to an information code symbol polynomial expression, RS code generator polynomial general type is:
G(x)＝(x-a 0)(x-a 1)...(x-a m-d)
Like this, by d the error correcting code symbol that obtains, just can calculate corresponding complete error correction code word.At this, will be called by such error correction code word that calculates " legal error correction code word " relevant with media content.So-called " legal " refers to that this error correction code word is to judge the whether foundation of legal (that is whether being pirate) of media content.As mentioned above, error correction code word C (m, q, d) can support q dIndividual legal broadcaster namely, has and q dIndividual legal broadcaster is the q of correspondence respectively dIndividual legal error correction code word, the processing of step S330 namely is to obtain this q dIn the individual legal error correction code word one.Next, based on this legal error correction code word and from media content the relation between the detected code word judge that this media content is whether pirate.
Particularly, the step S340 in Fig. 3 detects in m the fragment of media content whether the corresponding error correcting code symbol of other fragments and this legal error correction code word mate except above-mentioned d continuous fragment.And determine according to matching result how media content is processed.For example, if do not mate, then this media content is thought piracy and forbidden its broadcast.If coupling is then thought this media content legal copy and it is carried out respective handling, for example this media content is carried out normal play.
Fig. 6 has provided an object lesson of the media content player method among Fig. 3.As shown in Figure 6, this player method starts from step S610.At step S615, a counter i and its initial value are set are set to 0, be used for the code-word symbol that extracts is counted.At step S620, in d the fragment among the m of the decrypt media content fragment, continuous in the i contents fragment accordingly with the watermark copy and extract wherein watermark information w iAt step S625, whether the value i that judges counter I is less than the dimension d of error correction code word.If less than d, then the required d of the explanation legal error correction code word of a generation code-word symbol is still inadequate, so with w iBuffer memory (S630), the watermark information of proceeding step S620 extracts to be processed.Equal d if judge the value i of counter I at step S640, then generate the legal error correction code word relevant with current broadcaster at step S645 by d the corresponding code-word symbol of watermark information that is drawn into.Obtain just can carrying out the processing of step S650-S670 after the legal error correction code word.Particularly, in the situation that i is greater than d, will continue the watermark information w that extraction obtains other fragments from fragment m fragment, extracted watermark information except d at step S650 iI code-word symbol compares in corresponding code-word symbol and the legal error correction code word.If both are identical, then play w at step S660 iCorresponding i contents fragment.And if judge that at step S665 all m contents fragment finishes, with regard to detection of end and play all media contents (S670), because determined in the processing in front in the error correcting code symbol that detects for all m contents fragment and the legal error correction code word that code-word symbol is mated fully accordingly, so think that media content is the version through authorized copy or distribution, namely legal.As shown in the figure, if judge not process for all m contents fragment at step S665, then counter i is increased progressively and continues next contents fragment is carried out the processing of step S620-S670.Moreover, if the determination result is NO at step S650, judge in step S655 that then media content is pirate, and stop the broadcast of this media content, the detection that no longer continues and broadcast.
When detecting one by one for other fragments except d continuous fragment, pending fragment can be in turn selected in order in the example of Fig. 6, also pending fragment can be selected at random.So, so that when the corresponding contents fragment being processed to extract watermark information and obtaining code-word symbol dirigibility larger.In addition, in the situation of in turn selecting pending fragment, play immediately this fragment in the time of can being positive in the matching treatment result of related content fragment also.
In the example of Fig. 6, after calculating legal error correction code word, whether pirate by other fragments in m the fragment being detected one by one determine whether to play this fragment and this media content.But, but in a kind of embodiment of alternative, also can compare with legal error correcting code again after code-word symbol corresponding to all fragments in other fragments by obtaining.In this case, can be by the corresponding code-word symbol of other fragments and aforesaid d the common combination that forms a code-word symbol of code-word symbol that continuous fragment is corresponding, here can be called is " detection code word ", in order to distinguish by the legal error correction code word that the continuous code-word symbol of d calculates with the front.Compare detecting code word and legal error correction code word, if comparative result shows that both mate, think that then media content is legal, and this media content is carried out respective handling, for example this media content of normal play.Otherwise, think that media content is pirate, and will not play this media content.Although this mode may be so that do not play media content before finishing final matching treatment, but, because the proportion that common m contents fragment occupies in whole media content is lower, therefore this processing can't too affect user's experience that media content is play when guaranteeing efficient and accuracy.
Certainly, although in the above example, proceed normal broadcast when judging media content for legal copy, that is, frontier inspection is surveyed the limit and is play; But, can temporarily not play yet, for example, finish first matching detection to determine that whether media content is as legal, if legal copy is play again; Perhaps whether pirate then it is enough only obtaining in some cases judged result, for example, only pirate rate added up, and determines that pirate amount accounts for great ratio in the media content of predetermined quantity, etc.
It is noted that in example illustrated in fig. 6, matching detection is that the beginning of d fragment continuous among m the fragment is carried out.But, in other possible examples, also can begin from the optional position of m fragment to detect, as long as by this m is obtained continuous d the watermark information corresponding with the individual continuous fragment of d with the detection of watermark fragment is final, and obtain thus d continuous code-word symbol in the error correction code word, can calculate legal error correction code word.
In addition, in a kind of specific implementation according to this anti-pirate coal body content playback method of the embodiment of the invention, if from media content, do not detect any watermark information, can think that then this media content is the pirate version of full plaintext of unauthorized generation, and will not play this media content.So just avoided the defective that can't correctly detect for this full plaintext piracy in the prior art.
As mentioned above, for the error correction code word of media content setting for example can be the code word of nested type, each in the m of this error correction code word code-word symbol itself is exactly an error correction code word, can reduce significantly amount of redundant information like this.In addition, the watermark information that embeds the copy of each fragment in media content can be and error correcting code symbol corresponding to this copy or the information relevant with this error correcting code symbol.
Fig. 7 has provided and will be used for according to this anti-pirate media content player method of the embodiment of the invention preventing conspiring the schematic diagram of pirate example.As shown in Figure 7, suppose to conspire the piracy of pirate generating media content by user A and B.Wherein, the user A media content version A that utilizes the decruption key distribute to it to obtain comprises each copy q of m fragment A0, q A1, q A2..., q Am-1, and the error correction code word relevant with user A is code word A (a 0, a 1, a 2..., a M-1), the media content version B that user B utilizes the decruption key distribute to it to obtain comprises each copy q of m fragment B0, q B1, q B2..., q Bm-1, and the error correction code word relevant with user B is code word B (b 0, b 1, b 2..., b M-1).User A and B are by utilizing its contents version A and B separately, and (Round-Robin, that is, alternately provides the mode of contents fragment separately) generates piracy in the polling dispatching mode.For this pirate media content, by utilizing the anti-pirate media content player method of the invention described above embodiment, calculating legal error correction code word is C (a 0, b 1, l 2, l 3..., l M-1), and be C ' (a by the corresponding contents fragment being detected the detection code word that obtains 0, b 1, a 2, b 3..., a M-1), the two obviously is unmatched.Therefore can judge that this media content is user A and the pirate product of B conspiracy, and forbid its broadcast.
According to top description as can be known, anti-pirate media content generation method and the player method according to the embodiment of the invention designed a kind of fast and effectively pirate detection technique.When producing and generating media content, therefrom extract some fragments, each fragment generates a plurality of different variablees (being a plurality of different copies of each fragment) by embedding different digital watermarkings.Each user (that is, the broadcaster) can only decipher one of them variable, and the variable that can decipher is by determining with user-dependent unique error correcting code.Accordingly, when playing, after media content deciphering finished, detect the error correcting code that watermark information in the corresponding Variables Sequence wherein can obtain a combined method, that is, and legal error correction code word.If the testing result to respective segments is not and the legal-code symbol of this legal error correction codeword matching to judge that then media content is pirate, for example conspires pirate.In addition, if detected at all, illustrates then that this media content is for complete expressly pirate less than watermark information.This processing mode has been utilized the error correcting code characteristic, can detect quickly and efficiently piracy and forbid pirate broadcast, thereby provide effective digital copyright protecting to media content.
Just can calculate legal error correction code word and carry out matching treatment owing to only need to obtain a small amount of d code-word symbol, be very little to the calculated load of system therefore.
In addition, the storage space requirement for the corresponding relation between storage error correction code-word symbol, encryption key and the watermark information (or band watermark copy) also is low-down.Particularly, if employed error correcting code parameter is C (m, q, d), then being used for storing the needed memory capacity of above-mentioned corresponding relation is the individual unit of m*q* (k_length+q_length+c_length).For example, if each error correction code-word symbol, encryption key and watermark information are respectively 128 bits, then need the memory capacity of 3*128*m*q bit to store corresponding relation between them.Using error correction code word C (15,16,2) in the situation, needed memory capacity is 3*128*15*16=92,160 bits (approximately 92KB), and for playback equipment, in the situation that encryption key is identical with decruption key, because it needs the corresponding relation between storage error correction code-word symbol and the watermark information, therefore needed memory capacity is 2*128*15*16=61,440 bits (approximately 61KB).Even using error correction code word C (255,256,4) in order to support 2 32(q d=256 4) individual user (that is, has 2 32Individual legal-code) time, needed memory capacity also is 3*128*255*256=25,067,520 bits (approximately 25MB), for playback equipment, in the situation that encryption key is identical with decruption key, needed memory capacity is 2*128*255*256=16,711,680 bits (approximately 16MB).As seen, the requirement for system memory space is low-down.
As mentioned above, can use the error correction code word of nested form, thereby reduce amount of redundant information.For example, if use error correction code word C (255,256,4), i.e. q=256,256 4=2 32Accordingly, redundant storage is (256-1) * 255 storage cell.With regard to computing cost, obtain 4 code-word symbol and just can generate the complete error correction code word that comprises 255 code-word symbol, this is very little computing cost.
Contrast, if use the error correction code word of nested form, for example, outer code word is C (255,256,4), and it is nested by internal layer code word C (15,16,2) institute, and then each code-word symbol of outer code word is provided by the internal layer code word.So for each contents fragment, redundant storage is (16-1) * 15 storage cell.Reduced significantly the amount of redundant storage.With regard to computing cost, when obtaining 2 code-word symbol, just can calculate the complete internal layer error correction code word that comprises 15 code-word symbol.And for outer code word, obtain 4 code-word symbol and just can generate the complete error correction code word that comprises 255 code-word symbol, overall computing cost also is relatively little.
Correspondingly, embodiments of the invention also provide a kind of for anti-pirate media content generating apparatus.Fig. 8 shows the designs simplification block diagram of this device 800.As shown in the figure, this device 800 comprises watermark embedded unit 810, it is configured to select arbitrarily m fragment from original media content, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein be that in d the fragment continuous in m the fragment each embeds q watermark information, in order to be q band of each fragment formation watermark copy in d the fragment, utilize respectively different encryption keys to be encrypted all of this m fragment with the watermark copy, in order to generate the media content with anti-pirate characteristic.At this, m, d and q are the positive integers more than or equal to 2, and d is less than or equal to m.Device 800 also comprises correspondence relation storage 820, and it is configured to store the corresponding relation between watermark information, error correcting code symbol and the encryption key, to be used for the determining legal error correction code word relevant with legal broadcaster when media content is play.Wherein, consist of the error correction code word corresponding with original media content by the error correcting code symbol corresponding with the watermark information of all m fragment, this error correction code word can be determined the formation component that legal error correction code word is described error correction code word by that comprise in this error correction code word, corresponding with d continuous fragment d continuous code-word symbol.
Utilizing this device that media content is managed, for example during generating media content, for example can adopt the RS code as the error correction code word, it comprises m code-word symbol, and wherein each code-word symbol of a continuous d code-word symbol has the different value of q kind.The dimension of this RS code word is d, wherein, the m of a RS code code-word symbol is corresponding one by one with m fragment of media content, meets above-mentioned error correcting code symbol and the corresponding relation between the watermark information between the watermark information that embeds in the different value that each code-word symbol the has fragment corresponding with this code-word symbol.
The anti-pirate media content generation method that is used for according to the embodiment of the invention of describing with reference to Fig. 1-2 above device 800 and each component units thereof for example can be configured to carry out, and can obtain corresponding technical benefits.Detail can referring to top associated description, be given unnecessary details at this no longer one by one.
In addition, embodiments of the invention also provide a kind of for anti-pirate media content playing device.Fig. 9 shows the result's of this device simplified block diagram.As shown in the figure, device 900 comprises legal error correction code word generation unit 910, it is configured to extract m with continuous d embedded in watermark fragment watermark information from media content, according to the predetermined corresponding relation between watermark information and the error correcting code symbol, obtain continuous d the error correcting code symbol corresponding with this continuous d watermark information, and the d that passes through to obtain continuous error correcting code symbol generates legal error correction code word.At this, d and m are the positive integers more than or equal to 2, and m is more than or equal to d.Device 900 also comprises coupling checking broadcast unit 920, it is configured to from m with other watermark informations that extract the watermark fragment except a continuous d watermark information, error correcting code symbol and legal error correction code word that will be corresponding with other watermark informations be mated, and come media content is processed according to matching result.
Figure 10 shows a kind of object lesson of said apparatus 900.As shown in the figure, legal error correction code word generation unit 910 in the device 1000 of this object lesson comprises: deciphering subelement 1010, it is configured to utilize corresponding decruption key that a band watermark copy continuous d fragment, encrypted is decrypted, to obtain continuous d the band watermark copy corresponding with this continuous d fragment; Watermark information extracts subelement 1020, and it is configured to from d with extracting an above-mentioned continuous d watermark information the watermark copy; And legal error correction code word generates subelement 1030, and it is configured to generate legal error correction code word according to continuous d error correcting code symbol.
Figure 11 shows the another kind of object lesson of said apparatus 900.Comprise that according to the checking of the coupling in the device 1100 of this object lesson broadcast unit 920 the error correcting code symbol obtains subelement 1110, error correcting code symbol relatively subelement 1120 and Play Control subelement 1130.These subelements are configured to proceed as follows with other all fragments except the fragment corresponding with a continuous d watermark information in the watermark fragment for m: the error correcting code symbol obtains in the fragment that subelement 1110 selects from these other all fragments and extracts embedded watermark information, the error correcting code symbol corresponding according to the corresponding relation of the being scheduled to acquisition between watermark information and the error correcting code symbol and this watermark information; Error correcting code symbol comparison subelement 1120 will be compared by the error correcting code symbol that the error correcting code symbol obtains relevant position in error correcting code symbol that subelement 1110 obtains and the legal error correction code word; If both are different, judge that then media content is pirate, Play Control subelement 1130 stops to play described media content, and installs 1100 operations that stop rest segment in above-mentioned other all fragments; Otherwise the Play Control subelement is play this fragment.The error correcting code symbol obtains subelement 1110, error correcting code symbol comparison subelement 1120 and Play Control subelement 1130 to carry out above-mentioned error correcting code symbol for another fragment of selecting and obtains operation, error correcting code sign comparison operation and Play Control operation from other all fragments, until a continuous d fragment other all fragments have in addition been carried out these operations.
Figure 12 shows another object lesson of said apparatus 900.Comprise according to the coupling in the device 1200 of this object lesson checking broadcast unit 920: detect the error correction code word and generate subelement 1210, it is configured to jointly consist of detection error correction code word by the error correcting code symbol corresponding with above-mentioned other watermark informations and continuous d error correcting code symbol having obtained; And, code word relatively and Play Control subelement 1220, it is configured to detection error correction code word and legal error correction code word are compared, if both are identical, normal play media content then, otherwise, think that media content is piracy, and will not play this media content.
The anti-pirate media content player method that is used for according to the embodiment of the invention of describing with reference to Fig. 3-6 above device 900,1000,1100,1200 and each component units thereof for example can be configured to carry out, and can obtain corresponding technical benefits.Detail can referring to top associated description, be given unnecessary details at this no longer one by one.
Except realizing as functional device independently, can also be configured to existing media content playback equipment (DVD player for example according to the above-mentioned of the embodiment of the invention for anti-pirate media content playing device, game machine, etc.) in, thus, this media content playback equipment just can be play the control that the media content that generates by the media contents management technology that is used for fighting against piracy according to the embodiment of the invention is fought against piracy.Therefore this media content playback equipment with anti-pirate media content detection playing function also should be considered to fall within protection scope of the present invention.
Moreover, can also be configured to traditional AACS optical disk system according to the above-mentioned of the embodiment of the invention for anti-pirate media content playing device.Figure 13 has provided the designs simplification block diagram of this system.As shown in figure 13, the unit shown in the square frame 1310 is the above-mentioned media content playing device 900 for fighting against piracy according to the embodiment of the invention, and remainder 1320-1380 is that the function of traditional AACS optical disk system realizes module.As seen, this AACS optical disk system has had additional anti-pirate detection and playing function, only function composition unit 1310 modules need to be inserted between the monitoring means 1320 of AACS optical disk system and the tracing unit 1330 to get final product.The general formation of traditional AACS optical disk system and function thereof realize being well known to those skilled in the art, and do not repeat them here.
Easily understand, the function of unit 1310 equally also can realize by the media content playing device shown in for example Figure 10-12.
Can pass through hardware, software and/or firmware realization in this device, equipment, each component parts of system and series of processes of method that it is pointed out that the various embodiments described above according to the present invention.In the situation that realize by software and/or firmware, for example can be from storage medium or network to the computing machine with specialized hardware structure, for example general purpose personal computer 1400 shown in Figure 14 is installed the program that consists of this software, this computing machine is when being equipped with various program, can carry out the various functions described in above-described embodiment and process etc., thereby consist of the example that to realize according to the messaging device of the media content generation method of the embodiment of the invention and player method.
In Figure 14, CPU (central processing unit) (CPU) 1401 carries out various processing according to the program of storage in the ROM (read-only memory) (ROM) 1402 or from the program that storage area 1408 is loaded into random access memory (RAM) 1403.In RAM 1403, also store as required data required when CPU 1401 carries out various processing etc.
CPU 1401, ROM 1402 and RAM 1403 are connected to each other via bus 1404.Input/output interface 1405 also is connected to bus 1404.
Following parts are connected to input/output interface 1405: importation 1406 comprises keyboard, mouse etc.; Output 1407 comprises display, such as cathode-ray tube (CRT) (CRT), liquid crystal display (LCD) etc., and loudspeaker etc.; Storage area 1408 comprises hard disk etc.; With communications portion 1409, comprise that network interface unit is such as LAN card, modulator-demodular unit etc.Communications portion 1409 is processed such as the Internet executive communication via network.
As required, driver 1410 also is connected to input/output interface 1405.Detachable media 1411 is installed on the driver 1410 as required such as disk, CD, magneto-optic disk, semiconductor memory etc., so that the computer program of therefrom reading is installed in the storage area 1408 as required.
In the situation that realize above-mentioned series of processes by software, from network for example the Internet or storage medium for example detachable media 1411 program that consists of softwares is installed.
It will be understood by those of skill in the art that this storage medium is not limited to shown in Figure 14 wherein has program stored therein, distributes separately to provide the detachable media 1411 of program to the user with equipment.The example of detachable media 1411 comprises disk (comprising floppy disk (registered trademark)), CD (comprising compact disc read-only memory (CD-ROM) and digital universal disc (DVD)), magneto-optic disk (comprising mini-disk (MD) (registered trademark)) and semiconductor memory.Perhaps, storage medium can be hard disk that comprises in ROM 1402, the storage area 1408 etc., computer program stored wherein, and be distributed to the user with the equipment that comprises them.
As seen, the embodiment of the invention also discloses a kind of program product that stores the instruction code that machine readable gets, when this instruction code is read and carried out by machine, can carry out anti-pirate media content generation method or the media content player method of being used for of previous embodiment of the present invention.The embodiment of the invention also discloses simultaneously a kind of storage medium, it carries the instruction code that machine readable is got, when described instruction code is read and carried out by machine, can carry out anti-pirate media content generation method or the media content player method of being used for of previous embodiment of the present invention.
In the above in the description to the specific embodiment of the invention, can in one or more other embodiment, use in same or similar mode for the feature that a kind of embodiment is described and/or illustrated, combined with the feature in other embodiment, or the feature in alternative other embodiment.
Should emphasize, term " comprises/comprise " existence that refers to feature, key element, step or assembly when this paper uses, but does not get rid of the existence of one or more further feature, key element, step or assembly or additional.
In addition, according to the method for various embodiments of the present invention with process the time sequencing of describing in being not limited to specifications and carry out, also can according to other time sequencing ground, carry out concurrently or independently.Therefore, the whole bag of tricks of describing in this instructions and the execution sequence of processing are not construed as limiting technical scope of the present invention.
Although the above discloses the present invention by the description to specific embodiments of the invention, should be appreciated that, all above-mentioned embodiment and example all are illustrative, and not restrictive.Those skilled in the art can design various modifications of the present invention, improvement or equivalent in the spirit and scope of claims.These modifications, improvement or equivalent also should be believed to comprise in protection scope of the present invention.

Claims (24)

1. one kind is used for anti-pirate media content generation method, comprising:
From original media content, select arbitrarily m fragment, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, in the wherein said m fragment in continuous d the fragment each is embedded into q watermark information, in order to be q band of each fragment formation watermark copy in the described d fragment, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all m fragment, wherein, described error correction code word can be by comprising in this error correction code word, the d corresponding with a described continuous d fragment continuous code-word symbol is determined, m, d and q are the positive integers more than or equal to 2, and d is less than or equal to m;
Utilize respectively different encryption keys to be encrypted all of a described m fragment with the watermark copy, in order to generate the media content with anti-pirate characteristic; And
Corresponding relation between storage watermark information, error correcting code symbol and the encryption key is to be used for the determining legal error correction code word relevant with legal broadcaster, the formation component that wherein said legal error correction code word is described error correction code word when media content is play.
2. as claimed in claim 1 for anti-pirate media content generation method, wherein, described error correction code word is Read-Solomon RS code, it comprises m code-word symbol, each code-word symbol of d wherein continuous code-word symbol has the different value of q kind, wherein, the m of a described RS code code-word symbol is corresponding one by one with m fragment of the described media content with anti-pirate characteristic, meets the error correcting code symbol of described storage and the corresponding relation between the watermark information between the watermark information that embeds in the different value that each code-word symbol has and the corresponding fragment of this code-word symbol.
3. as claimed in claim 1 wherein, described error correction code word is the code word of nested type for anti-pirate media content generation method, and each in the m of the described error correction code word code-word symbol is an error correction code word.
4. such as each described media content generation method for fighting against piracy among the claim 1-3, wherein, each described watermark information with embedding in the watermark copy is with error correcting code symbol corresponding to watermark copy or the information relevant with this error correcting code symbol with this.
5. one kind is used for anti-pirate media content generating apparatus, comprising:
The watermark embedded unit, it is configured to select arbitrarily m fragment from original media content, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein be that in d the fragment continuous in the described m fragment each embeds q watermark information, in order to be q band of each fragment formation watermark copy in the described d fragment, utilize respectively different encryption keys to be encrypted all of a described m fragment with the watermark copy, in order to generate the media content with anti-pirate characteristic, wherein, m, d and q are the positive integers more than or equal to 2, and d is less than or equal to m; And
Correspondence relation storage, it is configured to store the corresponding relation between watermark information, error correcting code symbol and the encryption key, to be used for the determining legal error correction code word relevant with legal broadcaster when media content is play;
Wherein, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all m fragment, this error correction code word can be determined the formation component that described legal error correction code word is described error correction code word by that comprise in the described error correction code word, corresponding with a described continuous d fragment d continuous code-word symbol.
6. as claimed in claim 5 for anti-pirate media content generating apparatus, wherein, described error correction code word is Read-Solomon RS code, it comprises m code-word symbol, each code-word symbol of d wherein continuous code-word symbol has the different value of q kind, wherein, the m of a described RS code code-word symbol is corresponding one by one with m fragment of the described media content with anti-pirate characteristic, meets the error correcting code symbol of described storage and the corresponding relation between the watermark information between the watermark information that embeds in the different value that each code-word symbol the has fragment corresponding with this code-word symbol.
7. one kind is used for anti-pirate media content player method, comprising:
Extract m with continuous d embedded in watermark fragment watermark information from media content, wherein d and m are the positive integers more than or equal to 2, and m is more than or equal to d;
According to the predetermined corresponding relation between watermark information and the error correcting code symbol, obtain continuous d the error correcting code symbol corresponding with described continuous d watermark information, and the individual continuous error correcting code symbol of the d that passes through to obtain generates legal error correction code word; And
From described m with other watermark informations that extract the watermark fragment except described continuous d watermark information, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated, and according to matching result described media content are processed.
8. as claimed in claim 7 for anti-pirate media content player method, wherein, the m of described media content embeds in the following way with the watermark information in the watermark fragment:
Select any m fragment of original media content, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein be that in d the fragment continuous in the described m fragment each embeds q watermark information, in order to be q band of each fragment formation watermark copy in the described d fragment, wherein, each watermark information is corresponding to an error correcting code symbol, in order to form the described predetermined corresponding relation between watermark information and the error correcting code symbol, and, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all fragments, described error correction code word can be by comprising in the described error correction code word, the d corresponding with a described continuous d fragment continuous code-word symbol determines, wherein q is the positive integer more than or equal to 2; And
Utilize respectively different encryption keys that described m all band watermark copies with the watermark fragment are encrypted.
9. as claimed in claim 8 for anti-pirate media content player method, wherein,
D continuous watermark information of described extraction comprises:
Utilize corresponding decruption key to described continuous d fragment, encrypted band watermark copy is decrypted, and is with the watermark copy to obtain corresponding with described continuous d fragment continuous d;
Individual with extracting a described continuous d watermark information the watermark copy from described d.
10. such as each described media content player method for fighting against piracy among the claim 7-9, wherein, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated and according to matching result described media content are processed and comprise:
Proceed as follows with other all fragments except the fragment corresponding with described continuous d watermark information in the watermark fragment for described m:
Extract embedded watermark information the fragment of among described other all fragments, selecting, according to the described predetermined error correcting code symbol that corresponding relation obtains and this watermark information is corresponding between watermark information and the error correcting code symbol;
The error correcting code symbol of relevant position in this error correcting code symbol and the described legal error correction code word is compared, if both are different, think that then described coal body content is pirate, and stop to play described media content and stop operation to rest segment in described other all fragments; Otherwise
Play a described fragment, and carry out operation and the operation relatively of error correcting code symbol of the corresponding error correcting code symbol of described acquisition for another fragment of among described other all fragments, selecting, until described other all fragments have been carried out operation and the operation relatively of error correcting code symbol of the corresponding error correcting code symbol of described acquisition.
11. such as each described media content player method for fighting against piracy among the claim 7-9, wherein, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated and according to matching result described media content are processed and comprise:
Jointly consist of by the error correcting code symbol corresponding with described other watermark informations and d the described continuous error correcting code symbol that obtained and to detect the error correction code word, described detection error correction code word and described legal error correction code word are compared, if both are identical, the described media content of normal play then, otherwise, think that described media content is pirate, and will not play described media content.
12. such as each described media content player method for fighting against piracy among the claim 7-9, wherein:
If from media content, do not detect any watermark information, think that then described media content is the full plaintext piracy of unauthorized generation, and will not play described media content.
13. such as each described media content player method for fighting against piracy among the claim 7-9, wherein, described error correction code word is Read-Solomon RS code, it comprises m code-word symbol, each code-word symbol of d wherein continuous code-word symbol has the different value of q kind, wherein, the m of a described RS code code-word symbol is corresponding one by one with m fragment of described coal body content, meets the predetermined corresponding relation between described error correcting code symbol and the watermark information between the watermark information that embeds in the different value that each code-word symbol has and the corresponding fragment of this code-word symbol.
14. such as each described media content player method among the claim 7-9, wherein, described error correction code word is the code word of nested type, each in the m of the described error correction code word code-word symbol is an error correction code word.
15. be used for as claimed in claim 8 or 9 anti-pirate media content player method, wherein, each is with error correcting code symbol corresponding to watermark copy or the information relevant with this error correcting code symbol with this with the watermark information that embeds in the watermark copy.
16. one kind is used for anti-pirate media content playing device, comprises:
Legal error correction code word generation unit, it is configured to extract m with continuous d embedded in watermark fragment watermark information from media content, according to the predetermined corresponding relation between watermark information and the error correcting code symbol, obtain continuous d the error correcting code symbol corresponding with described continuous d watermark information, and the d that passes through to obtain continuous error correcting code symbol generates legal error correction code word, wherein d and m are the positive integers more than or equal to 2, and m is more than or equal to d; And
Coupling checking broadcast unit, it is configured to from described m with other watermark informations that extract the watermark fragment except described continuous d watermark information, error correcting code symbol that will be corresponding with described other watermark informations and described legal error correction code word are mated, and according to matching result described media content are processed.
17. as claimed in claim 16 for anti-pirate media content playing device, wherein, the m of described media content embeds in the following way with the watermark information in the watermark fragment:
Select any m fragment of original media content, for each fragment embeds respectively at least one watermark information in order to be with watermark copy for each fragment forms at least one, wherein be that in d the fragment continuous in the described m fragment each embeds q watermark information, in order to be q band of each fragment formation watermark copy in the described d fragment, wherein, each watermark information is corresponding to an error correcting code symbol, in order to form the described predetermined corresponding relation between watermark information and the error correcting code symbol, and, consist of the error correction code word corresponding with described original media content by the error correcting code symbol corresponding with the watermark information of all fragments, described error correction code word can be by comprising in the described error correction code word, the d corresponding with a described continuous d fragment continuous code-word symbol determines, wherein q is the positive integer more than or equal to 2; And
Utilize respectively different encryption keys that all band watermark copies of a described m fragment are encrypted.
18. as claimed in claim 17 for anti-pirate media content playing device, wherein,
Described legal error correction code word generation unit comprises:
The deciphering subelement, its be configured to utilize corresponding decruption key to described continuous d fragment, encrypted band watermark copy is decrypted, and is with the watermark copy to obtain corresponding with described continuous d fragment continuous d;
Watermark information extracts subelement, and it is configured to from described d with extracting a described continuous d watermark information the watermark copy; And
Legal error correction code word generates subelement, and it is configured to generate described legal error correction code word according to a described continuous d error correcting code symbol.
19. such as each described media content playing device for fighting against piracy among the claim 16-18, wherein, described coupling checking broadcast unit comprises that the error correcting code symbol obtains subelement, error correcting code symbol relatively subelement and Play Control subelement, and above-mentioned these subelements are configured to:
Proceed as follows with other all fragments except the fragment corresponding with described continuous d watermark information in the watermark fragment for described m:
Described error correcting code symbol obtains and extract embedded watermark information the fragment that subelement selects among described other all fragment, according to the error correcting code symbol that described predetermined corresponding relation obtains and this watermark information is corresponding between watermark information and the error correcting code symbol;
Described error correcting code symbol comparison subelement will be compared by the error correcting code symbol that the error correcting code symbol obtains relevant position in error correcting code symbol that subelement obtains and the described legal error correction code word;
If both are different, judge that then described media content is pirate, described Play Control subelement stops to play described coal body content, and describedly stops operation to described other all fragment rest segment for anti-pirate media content playing device; Otherwise described Play Control subelement is play a described fragment; And
Described error correcting code symbol obtains subelement, error correcting code symbol comparison subelement and Play Control subelement to carry out the error correcting code symbol for another fragment of selecting and obtains operation, error correcting code sign comparison operation and Play Control operation among described other all fragments, obtain operation, error correcting code sign comparison operation and Play Control and operate until described other all fragments have been carried out described error correcting code symbol.
20. such as each described media content playing device for fighting against piracy among the claim 16-18, wherein, described coupling checking broadcast unit comprises:
Detect the error correction code word and generate subelement, it is configured to jointly consist of detection error correction code word by the error correcting code symbol corresponding with described other watermark informations and d the described continuous error correcting code symbol that obtained;
Code word compares and the Play Control subelement, and it is configured to described detection error correction code word and described legal error correction code word are compared, if both are identical, the described media content of normal play then, otherwise, think that described media content is pirate, and will not play described coal body content.
21. such as each described media content playing device for fighting against piracy among the claim 16-18, wherein, described error correction code word is Read-Solomon RS code, it comprises m code-word symbol, each code-word symbol of d wherein continuous code-word symbol has the different value of q kind, wherein, the m of a described RS code code-word symbol is corresponding one by one with m band watermark fragment of described media content, meets the predetermined corresponding relation between described error correcting code symbol and the watermark information between the watermark information that embeds in the different value that each code-word symbol has and the corresponding fragment of this code-word symbol.
22. the playback equipment that can prevent from playing pirate media content, it comprises such as any one among the above-mentioned claim 16-21 described for anti-pirate media content playing device.
23. the playback equipment that can prevent from playing pirate media content as claimed in claim 22, wherein said playback equipment is DVD player or game machine, and described media content is video information and/or audio-frequency information.
24. the advanced access content system AACS that can prevent from playing pirate media content, it comprises such as any one among the above-mentioned claim 16-21 described for anti-pirate media content playing device.
CN 201110209439 2011-07-18 2011-07-18 Media content generating method and device and media content playing method and device Pending CN102890756A (en)

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CN103208289A (en) * 2013-04-01 2013-07-17 上海大学 Digital audio watermarking method capable of resisting re-recording attack
CN104346544A (en) * 2013-07-30 2015-02-11 联想(北京)有限公司 Data processing method, data embedding device and data separating device
CN104756120A (en) * 2013-03-27 2015-07-01 爱迪德技术有限公司 Storing and accessing data
CN108886631A (en) * 2016-03-15 2018-11-23 日本电气株式会社 Electronic data checks system, electronic data inspection method and the storage medium for being stored with electronic data inspection program
CN109005425A (en) * 2018-08-26 2018-12-14 俞绍富 Network video monitor and control system
CN111510775A (en) * 2020-05-11 2020-08-07 知安视娱(南京)科技有限公司 Digital copyright management and watermark tracking method and system for set top box video in IPTV

Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN104756120A (en) * 2013-03-27 2015-07-01 爱迪德技术有限公司 Storing and accessing data
US9946474B2 (en) 2013-03-27 2018-04-17 Irdeto B.V. Storing and accessing data
CN104756120B (en) * 2013-03-27 2019-04-23 爱迪德技术有限公司 Store and access data
CN103208289A (en) * 2013-04-01 2013-07-17 上海大学 Digital audio watermarking method capable of resisting re-recording attack
CN104346544A (en) * 2013-07-30 2015-02-11 联想(北京)有限公司 Data processing method, data embedding device and data separating device
CN108886631A (en) * 2016-03-15 2018-11-23 日本电气株式会社 Electronic data checks system, electronic data inspection method and the storage medium for being stored with electronic data inspection program
CN109005425A (en) * 2018-08-26 2018-12-14 俞绍富 Network video monitor and control system
CN111510775A (en) * 2020-05-11 2020-08-07 知安视娱(南京)科技有限公司 Digital copyright management and watermark tracking method and system for set top box video in IPTV
CN111510775B (en) * 2020-05-11 2021-04-02 知安视娱(南京)科技有限公司 Digital copyright management and watermark tracking method and system for set top box video in IPTV

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