CN102164303A - Video copyright protection method and system as well as video publisher entity - Google Patents
Video copyright protection method and system as well as video publisher entity Download PDFInfo
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- CN102164303A CN102164303A CN201010119146XA CN201010119146A CN102164303A CN 102164303 A CN102164303 A CN 102164303A CN 201010119146X A CN201010119146X A CN 201010119146XA CN 201010119146 A CN201010119146 A CN 201010119146A CN 102164303 A CN102164303 A CN 102164303A
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Abstract
The invention provides a video copyright protection method and system as well as a video publisher entity. The method comprises the following steps: selecting a numeral fingerprint carrier from the original video information; performing copyright protection on the original video information except the numeral fingerprint carrier in an encrypting manner; at the needing moment, embedding a numeral fingerprint code into the numeral fingerprint carrier; and performing different copyright protection manners on the protected video information and then publishing to a user. In the process of embedding the numeral fingerprint code of the method, a partial video picture is confirmed as a fingerprint carrier according to the code length of the numeral fingerprint code, the number of the video picture needing the embedded fingerprint is reduced, and the video picture except the fingerprint carrier is pre-compressed, encrypted and stored in a video server. By using the method provided by the invention, the operation load of the server in the process of embedding numeral fingerprint is reduced, the unique numeral fingerprint code is embedded in each video copy, and the security of copyright protection is enhanced.
Description
Technical field
The present invention relates to a kind of video copyright protecting technology, relate in particular to a kind of based on video copyright protecting method, system and the video distribution side's entity of encrypting and resist the pirate digital finger-print of conspiracy.
Background technology
In recent years, highly developed network technology has been brought numerous very serious problems that also caused simultaneously easily to society.Resource acquisition technology has easily been aggravated the piracy to digital product, comprises illegally copying and distribution.Copy right piracy has destroyed the value chain of digital product, has damaged the interests of product producer, publication side, publisher and validated user, and the order of network world has been constituted serious threat.How digital product is carried out copyright protection and become one of focus of digital times.
Traditional copyright protection technology is usually based on the cryptography theory, and its protected mode is that file encryption is become ciphertext, and the disabled user can't be understood.But adopt method of encrypting pointed out the disabled user which be important information, cause curiosity and attention easily, make disabled user's target of attack very clear and definite, thereby the possibility that encrypt file is cracked increases greatly.In addition, be accompanied by the quick raising of computer process ability, thisly become more and more dangerous especially by increasing the method that key length improves level of confidentiality.Just in this case, Information Hiding Techniques occurred, and become digital product, especially the new defence line of multimedia digital product copyright protection.
As one of representative of Information Hiding Techniques, Digital Fingerprinting Technology is the new digital product copyright protection technology that grew up in recent years.With the video is example, and Digital Fingerprinting Technology is meant the unique fingerprint code of embedding in each user's video content, and user identity and digital finger-print binding are stored in the sales figure database.
If find that the publisher then extracts digital finger-print wherein by the video file of bootlegging or issue, and utilize tracing algorithm to follow the trail of the original user of being engaged in bootlegging.
For digital video technology, very big development was arranged also in more than ten years in the past.The development of video compression technology is mainly reflected on some new compression standards, as MPEG X, H.26X etc.Web TV is also popularized gradually in addition, and incident is Web TV and HDTV (High-Definition Television) etc.See that on the whole the Internet communication of compress technique and video is efficiently mutually promoted, and constantly advances the development of digital video technology.
If utilize Digital Fingerprinting Technology that video file is carried out copyright protection, then need in video content, to embed the digital finger-print sign indicating number.Consider the use value of video, in the process that embeds digital finger-print, must guarantee the sight of video.A kind of feasible solution is to embed the digital finger-print sign indicating number on the compression domain of video, like this, can reduce the bandwidth consumption of video transmission on the one hand, can fully guarantee the quality of video on the other hand on compression domain.
Yet, on compression domain, embed the digital finger-print sign indicating number and also have some problems.From the character of Digital Fingerprinting Technology as can be seen, video distribution side is necessary for each user and distributes a unique video copy.If when the user asks to buy video video compressed and embed the digital finger-print sign indicating number, this will handle load to video server and bring great pressure; If be ready to be embedded with the compressed video of digital finger-print in advance at transmit leg, this can bring bigger storage pressure to video server again.
In sum, at present, digital video is carried out copyright protection can realize by encryption technology or Digital Fingerprinting Technology.But encryption technology exists fail safe vulnerable; Yet embed the digital finger-print sign indicating number in compression domain the processing load and the storage of video server brought great pressure.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of video copyright protecting method, system and video distribution side's entity, can strengthen the fail safe of copyright protection, alleviates processing load and storage pressure that copyright protection is brought.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of video copyright protecting method comprises:
From original video information, select the digital finger-print carrier;
Adopt cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier;
When needs, the digital finger-print carrier is embedded the digital finger-print sign indicating number; With the video information combination rear line issue of adopting different copyright protection modes to protect.
The described digital finger-print carrier of selecting from original video information is: select the quantity of digital finger-print carrier according to digital finger-print sign indicating number code length, with the original video information selected as the digital finger-print carrier.
Described quantity according to digital finger-print sign indicating number code length selection digital finger-print carrier is:
Determine the bit number b of embeddable fingerprint code in every frame video according to compressed format, the predictive frame number p of adjacent I-interframe, if digital finger-print sign indicating number code length is N (bit), the fingerprint amount vector that then needs to select is at least:
Expression is not less than
Integer.
Describedly adopt cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier to comprise:
Learn the block count M of every frame video pictures according to the single frames video compression format, and to generate length be that the 0-1 sequence of M is as encryption key { s
1..., s
M, this key is as global secret;
In cataloged procedure, video I-frame brightness signal Y in the frame of i piece in every frame picture is carried out discrete cosine transform, to its DC component DY
i, if s
i=1, then
If s
i=0, Y then
iRemain unchanged.
Described when needs, the digital finger-print carrier is embedded the digital finger-print sign indicating number; The video information combination rear line issue of adopting different copyright protection modes to protect is comprised:
When being used to ask video information, from preset number fingerprint code database, select a digital fingerprint code to distribute to the user, and with this digital finger-print sign indicating number and user profile binding, the digital finger-print code table is shown { b
1..., b
N, wherein N is a digital finger-print sign indicating number code length;
In cataloged procedure, the digital finger-print sign indicating number is embedded in the described digital finger-print carrier, simultaneously to being embedded with the digital finger-print carrying encryption of digital finger-print sign indicating number;
After partly merging, original video information after the digital finger-print carrier of digital finger-print sign indicating number and the encryption except that digital fingerprint carrier is distributed to the user with being embedded with.
Describedly the digital finger-print sign indicating number be embedded into described digital finger-print carrier be:
To each the bit b in the described digital finger-print sign indicating number
i, if b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for negative, then with the coefficient of correspondence negate;
If b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, is 1 with the coefficient of correspondence assignment then;
If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for just, then with the coefficient negate;
If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, then will be that assignment is-1.
This method also comprises: user's request comprises the right objects of decryption of video key, and the video distribution square tube is crossed the encryption channel and sent right objects to the user, and the user watches video file after encrypted video is deciphered.
The decruption key that described user utilizes video distribution side to send comprises decryption of video:
Video distribution side authenticates user profile, and authentication sends right objects by rear line, wherein comprises decryption of video key { s
1..., s
M, M is the block count of every frame video pictures;
For i piece DC component DY in every frame picture
i, if s
i=1, DY then
i← DY
i* 2, if s
i=0, Y then
iRemain unchanged.
This method also comprises: when having pirate video, extracts the digital finger-print carrier in the pirate video, from the digital finger-print carrier that obtains, extracts the digital finger-print sign indicating number, and tracing pirate copies user or conspiracy pirate user.
Describedly from the digital finger-print carrier that obtains, extract the digital finger-print sign indicating number, and tracing pirate copies user or conspire pirate user and comprise:
Described digital finger-print carrier part is decoded, to each piecemeal B
i, if the coefficient magnitude of wherein selecting is being for just, then corresponding digital finger-print sign indicating number bit b
iBe 1; If wherein the coefficient of selecting is for negative, then corresponding digital finger-print sign indicating number bit is b
iBe 0;
By the tracking performance of digital finger-print sign indicating number and the corresponding relation between user and the digital finger-print sign indicating number, track the pirate copies user or conspire pirate user.
A kind of video copyright protecting system comprises user and video distribution side, wherein,
The user is used for initiating to buy request to video distribution side's entity; To video distribution side's entity requests right objects, encrypted video is deciphered;
Video distribution side's entity is used to issue video product; To video-encryption, generate digital finger-print code data storehouse, embed the digital finger-print sign indicating number in part in as the video of digital finger-print carrier.Also be further used for, extract digital finger-print and tracing pirates in the pirate video.
Described video distribution side entity mainly comprises unit, selected cell, the first copyright protected location, second copyright protected location and the assembled unit is set, wherein,
The unit is set, is used to set in advance the pirate digital finger-print code data of the anti-conspiracy storehouse of satisfying performance requirement, described digital finger-print sign indicating number has piracy tracking and collusion piracy tracking performance;
Selected cell is used for selecting the digital finger-print carrier from original video information, to the original video information of first copyright protected location output except that digital fingerprint carrier, to second copyright protected location output digital finger-print carrier;
The first copyright protected location adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier, and the first protection information is exported to assembled unit;
The second copyright protected location when needs, is used to from the digital finger-print sign indicating number that the unit is set the digital finger-print carrier be embedded the copyright protection of digital finger-print sign indicating number, and the second protection information is exported to assembled unit;
Assembled unit with the video information combination of adopting different copyright protection modes to protect, is issued protected video information to the user.
The described second copyright protected location is further used for, and the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
Described video distribution side entity also comprises:
Tracing unit is used for extracting the fingerprint carrier digital finger-print sign indicating number of pirate video, and according to the binding recording, tracking pirate user of user profile and digital finger-print sign indicating number.
A kind of video distribution side entity mainly comprises unit, selected cell, the first copyright protected location, second copyright protected location and the assembled unit are set, wherein,
The unit is set, is used to set in advance the pirate digital finger-print code data of the anti-conspiracy storehouse of satisfying performance requirement, described digital finger-print sign indicating number has piracy tracking and collusion piracy tracking performance;
Selected cell is used for selecting the digital finger-print carrier from original video information, to the original video information of first copyright protected location output except that digital fingerprint carrier, to second copyright protected location output digital finger-print carrier;
The first copyright protected location adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier, and the first protection information is exported to assembled unit;
The second copyright protected location when needs, is used to from the digital finger-print sign indicating number that the unit is set the digital finger-print carrier be embedded the copyright protection of digital finger-print sign indicating number, and the second protection information is exported to assembled unit;
Assembled unit with the video information combination of adopting different copyright protection modes to protect, is issued protected video information to the user.
The described second copyright protected location is further used for, and the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
Described video distribution side entity also comprises:
Tracing unit is used for extracting the fingerprint carrier digital finger-print sign indicating number of pirate video, and according to the binding recording, tracking pirate user of user profile and digital finger-print sign indicating number.
The technical scheme that provides from the invention described above refers in the fingerprint code telescopiny in numeral of the present invention as can be seen, as the fingerprint carrier, reduced the video pictures quantity that needs to embed fingerprint according to the code length determining section video pictures of digital finger-print sign indicating number; And the video pictures outside the fingerprint carrier compresses in advance, encrypts and is stored in the video server.By the inventive method, both reduced the computational load when server embeds digital finger-print, guaranteed again in each video copy, to embed unique digital finger-print sign indicating number, strengthened the fail safe of copyright protection.
Description of drawings
Fig. 1 realizes the flow chart of video copyright protecting method for the present invention;
Fig. 2 realizes the composition structural representation of video distribution side's entity in the video copyright protecting system for the present invention;
Fig. 3 carries out the flow chart of the embodiment of copyright protection to video file for video distribution side of the present invention;
Fig. 4 embeds the schematic diagram of embodiment for video-encryption of the present invention and digital finger-print;
Fig. 5 buys the flow chart of the embodiment of video, request right objects and decryption of video to the publisher for user of the present invention;
Fig. 6 carries out the flow chart of the embodiment of piracy tracking to pirate video for video distribution side of the present invention.
Embodiment
Fig. 1 is the flow chart that the present invention realizes the video copyright protecting method, as shown in Figure 1, comprising:
Step 100: from original video information, select the digital finger-print carrier.
Also comprise before this step: video distribution side sets in advance the pirate digital finger-print code data of the anti-conspiracy storehouse that (generation) satisfies performance requirement.Digital finger-print sign indicating number and user profile binding, digital finger-print sign indicating number have piracy tracking and collusion piracy tracking performance.
In this step, the method of selecting the digital finger-print carrier from original video information such as picture can be to select the quantity of digital finger-print carrier according to digital finger-print sign indicating number code length, roughly comprise: the bit number b that determines embeddable fingerprint code in every frame video according to compressed format, the predictive frame number p of adjacent I-interframe, if digital finger-print sign indicating number code length is N (bit), the fingerprint amount vector that then needs to select is at least:
Expression is not less than
Integer.
Such as digital finger-print sign indicating number code length is 1000, and the video compression picture is cif (320 * 288), and piecemeal is of a size of 16 * 16 during picture compression, total in then every pictures
Individual piecemeal.If embed digital 1bit fingerprint code in each piecemeal, the digital finger-print amount vector that then needs is
Promptly from all original video pictures, select 3 as the digital finger-print carrier.Selection can be at random, also can be to select according to the selection strategy that sets in advance.
Step 101: adopt cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier.
This step is carried out compressed encoding, encryption and storage to original video information except that digital fingerprint carrier such as picture, comprising:
Learn the block count M of every frame video pictures according to the single frames video compression format, and to generate length be that the 0-1 sequence of M is as encryption key { s
1..., s
M, this key is as global secret, and promptly each video file, every frame video pictures all adopt this encryption key; Be encrypted in the cataloged procedure and realize, and adopt slight encryption method, promptly the DC component of " in the frame " video (I-frame) luminance signal (Y) is carried out recoverable " destruction " according to key sequence, concrete grammar is: the Y-signal to i piece in every frame picture carries out discrete cosine transform (DCT, discrete cosine transformation), to its DC component DY
i, if s
i=1, then
If s
i=0, Y then
iRemain unchanged.
Be example with the cif form equally,, then generate length and be 360 0-1 sequence as encryption key { s if the piecemeal number in every pictures is 360
1..., s
360, this key is as global secret, and promptly each video file, every frame video pictures all adopt this encryption key;
Be encrypted in the cataloged procedure and realize, can adopt slight encryption method, promptly the DC component of (I-frame) luminance signal of video in the frame (Y) is carried out recoverable " destruction " according to key sequence, concrete grammar is roughly: the Y-signal to i piece in every frame picture carries out discrete cosine transform (DCT, discrete cosinetransformation), i={1 ..., 360}.To its DC component DY
i, if s
i=1, then
Be DY
iEqual
If s
i=0, DY then
iRemain unchanged.
Step 102: when needs, the digital finger-print carrier is embedded the digital finger-print sign indicating number; With the video information combination rear line issue of adopting different copyright protection modes to protect.
Further, the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
Refer in the fingerprint code telescopiny in numeral of the present invention, as the fingerprint carrier, reduced the video pictures quantity that needs to embed fingerprint according to the code length determining section video pictures of digital finger-print sign indicating number; And the video pictures outside the fingerprint carrier compresses in advance, encrypts and is stored in the video server.By the inventive method, both reduced the computational load when server embeds digital finger-print, guaranteed again in each video copy, to embed unique digital finger-print sign indicating number, strengthened the fail safe of copyright protection.
At the inventive method, a kind of video copyright protecting system also is provided, comprise user and video distribution side, wherein,
The user is used for initiating to buy request to video distribution side's entity; To video distribution side's entity requests right objects, encrypted video is deciphered;
Video distribution side's entity is used to issue video product; To video-encryption, generate digital finger-print code data storehouse, embed the digital finger-print sign indicating number in part in as the video of digital finger-print carrier.Also be further used for, extract digital finger-print and tracing pirates in the pirate video.
Fig. 2 realizes the composition structural representation of video distribution side's entity in the video copyright protecting system for the present invention; as shown in Figure 2; video distribution side's entity mainly comprises unit, selected cell, the first copyright protected location, second copyright protected location and the assembled unit is set, wherein
The unit is set, is used to set in advance the pirate digital finger-print code data of the anti-conspiracy storehouse that (generation) satisfies performance requirement, described digital finger-print sign indicating number has piracy tracking and collusion piracy tracking performance.
Selected cell is used for selecting the digital finger-print carrier from original video information, to the original video information of first copyright protected location output except that digital fingerprint carrier, to second copyright protected location output digital finger-print carrier.
The first copyright protected location adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier, and the first protection information is exported to assembled unit.
The second copyright protected location when needs, is used to from the digital finger-print sign indicating number that the unit is set the digital finger-print carrier be embedded the copyright protection of digital finger-print sign indicating number, and the second protection information is exported to assembled unit.The second copyright protected location is further used for, and the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
Assembled unit with the video information combination of adopting different copyright protection modes to protect, is issued protected video information to the user.
Video distribution side's entity also comprises tracing unit, is used for extracting the fingerprint carrier digital finger-print sign indicating number of pirate video, and according to the binding recording, tracking pirate user of user profile and digital finger-print sign indicating number.
Below in conjunction with embodiment the inventive method is described in detail.
Fig. 3 as shown in Figure 3, comprising for video distribution side of the present invention carries out the flow chart of the embodiment of copyright protection to video file:
Step 300: from the original video picture, select the part video information as the digital finger-print carrier.
The publisher selects the quantity of digital finger-print carrier according to the fingerprint code code length, such as:
The fingerprint code code length is 1000, and the video compression picture is cif (320 * 288), and piecemeal is of a size of 16 * 16 during picture compression, and then every pictures is total
Individual piecemeal.If embed digital 1bit fingerprint code in each piecemeal, the digital finger-print amount vector that then needs is
Promptly select in all video pictures 3 as the digital finger-print carrier.
Step 3011: video distribution side carries out compressed encoding, encryption and it is stored in server end the video pictures except that digital fingerprint carrier.Be example with the cif form equally:
Piecemeal number in every pictures is 360, then generates length and be 360 0-1 sequence as encryption key { s
1..., s
360, this key is as global secret, and promptly each video file, every frame video pictures all adopt this encryption key;
Be encrypted in the cataloged procedure and realize, and adopt slight encryption method, promptly the DC component of " in the frame " video (I-frame) luminance signal (Y) is carried out recoverable " destruction " according to key sequence, concrete grammar is: the Y-signal to i piece in every frame picture carries out dct transform, i={1,, 360}.To its DC component DY
i, if s
i=1, then
If s
i=0, Y then
iRemain unchanged;
Step 303: with digital finger-print carrier and the issue of remainder combination rear line.
The schematic diagram of the embodiment that Fig. 4 embeds and encrypts for digital video fingerprint code of the present invention in the present embodiment, supposes that user's digital finger-print sign indicating number is selected to distribute to by video distribution side in digital finger-print code data storehouse be { b
1..., b
1000; wherein the code length of fingerprint code is 1000; in cataloged procedure the digital finger-print sign indicating number is embedded in the digital finger-print carrier, considers only to embed 1bit digital finger-print sign indicating number here in each piecemeal, the piecemeal that the needs that then comprise in the digital finger-print carrier embed digital finger-print has 1000 { B
1..., B
1000; To the dct transform coefficient of each piecemeal, in the present embodiment, with first value AC[0 of the alternating current component of dct transform coefficient] as embedded location.To the dct transform coefficient of each piecemeal, according to the human visual system, select therein the embedded location of the insensitive part coefficient of vision system as fingerprint bit, in order not produce conflict with ciphering process, the coefficient of selection should be got rid of DC component.
For each bit b in the digital finger-print sign indicating number
i, i is 1,2,3 ... if N is b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for negative, then with the coefficient of correspondence negate; If b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, is 1 with the coefficient of correspondence assignment then; If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for just, then with the coefficient negate; If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, then will be that assignment is-1.Guarantee B by this operation
iThe positive negativity and the b of middle coefficient of correspondence
iThe value unanimity.Idiographic flow comprises as shown in Figure 4:
Step 400: judge b
iWhether equal 1, if b
i=1, then enter step 4011; Otherwise enter step 4021.
Step 4011: judge B
iMiddle AC
i[0] whether less than 0, if AC
i[0]＜0, then enters step 4012; Otherwise enter step 4013.
Step 4012:AC
i[0] composes to AC after the negate
i[0], i.e. AC
i[0] ←-AC
i[0], enters step 403.
Step 4013: judge B
iMiddle AC
i[0] whether equals 0, if AC
i[0]=0, then enters step 4014; Otherwise enter step 403.
Step 4014:AC
i[0] value is 1, enters step 403 afterwards.
Step 4021: judge B
iMiddle AC
i[0] whether greater than 0, if AC
i[0]＞0, then enters step 4022; Otherwise enter step 4023.
Step 4022:AC
i[0] composes to AC after the negate
i[0], i.e. AC
i[0] ←-AC
i[0], enters step 403.
Step 4023: judge B
iMiddle AC
i[0] whether equals 0, if AC
i[0]=0, then enters step 4024; Otherwise enter step 403.
Step 4024:AC
i[0] value is-1, enters step 403 afterwards.
After adding 1, step 403:i enters step 404.
Step 404: whether judge i greater than N, if greater than, then enter step 405; Otherwise return step 400.
Step 405: utilize method in the step 3011 to being embedded with the digital finger-print carrying encryption of digital finger-print sign indicating number.
The flow chart that Fig. 5 buys video, asks the embodiment of right objects and decryption of video to the publisher for user of the present invention, as shown in Figure 5,
Step 500: when the user asked to buy video information, video distribution side confirmed user profile.
Step 501: judge whether the affirmation of user profile is passed through, if pass through, enter step 502, otherwise enter step 507.
Step 502: video distribution side is user's distribute digital fingerprint code and is saved in the sales figure.
Step 503: the digital finger-print sign indicating number that in the digital finger-print carrier, embed to distribute, and will embed and be distributed to the user after other parts in the video information of the digital finger-print carrier of digital finger-print sign indicating number and request make up.
Step 504: the user comprises decryption of video key { s to the request of video distribution side
1..., s
MRight objects, video distribution side confirms user profile.
Step 505: judge whether the affirmation of user profile is passed through, if pass through, enter step 506, otherwise enter step 507.
Step 506: the video distribution square tube is crossed the encryption channel and is sent right objects to the user, and the user receives right objects and to decryption of video.With the cif form is example, and user side is in video decoding process, and the luminance signal of each piecemeal of focus attentions equally on I-frame picture is done deciphering, concrete grammar to its DCT DC component: to i piece DC component DY in every frame picture
i, if s
i=1, DY then
i← DY
i* 2, if s
i=0, Y then
iRemain unchanged.
Step 507: process ends.
User of the present invention as shown in Figure 5 and the transaction flow between the video distribution side; the user buys product and relevant personal information is provided to the request of video distribution side, and the user also needs to ask right objects just can watch video to the publisher after obtaining shielded video file.Video distribution process among the present invention can the existing DRM standard of seamless access.
Fig. 6 as shown in Figure 6, comprising for video distribution side of the present invention carries out the flow chart of the embodiment of piracy tracking to pirate video:
Step 600: video distribution side detects pirate video product on network.
In the piracy tracking process, can initiatively from internet data, excavate pirate video copy, tracing pirates then in conjunction with prior aries such as the detection of the file in the network, data minings.
Step 601～step 602: video distribution side extracts the digital finger-print carrier in the pirate video, and extracts the digital finger-print sign indicating number from the digital finger-print carrier that obtains.
The digital finger-print carrier part is decoded, pay close attention to the DCT coefficient of I-frame piecemeal in the decode procedure, the piecemeal of concern is { B
1..., B
1000.According to telescopiny, the extracting method of digital finger-print sign indicating number is in this step: to each piecemeal B
i, if AC
i[0]＞0, then corresponding digital finger-print sign indicating number bit b
i=1; If AC
i[0]＜0, then corresponding digital finger-print sign indicating number bit is b
i=0.
Step 603: by the tracking performance of digital finger-print sign indicating number, and the corresponding relation between user and the digital finger-print sign indicating number, can track the pirate copies user or conspire pirate user.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. a video copyright protecting method is characterized in that, comprising:
From original video information, select the digital finger-print carrier;
Adopt cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier;
When needs, the digital finger-print carrier is embedded the digital finger-print sign indicating number; With the video information combination rear line issue of adopting different copyright protection modes to protect.
2. video copyright protecting method according to claim 1; it is characterized in that; the described digital finger-print carrier of selecting from original video information is: select the quantity of digital finger-print carrier according to digital finger-print sign indicating number code length, with the original video information selected as the digital finger-print carrier.
3. video version guard method according to claim 2 is characterized in that, described quantity according to digital finger-print sign indicating number code length selection digital finger-print carrier is:
Determine the bit number b of embeddable fingerprint code in every frame video according to compressed format, the predictive frame number p of adjacent I-interframe, if digital finger-print sign indicating number code length is N (bit), the fingerprint amount vector that then needs to select is at least:
Expression is not less than
Integer.
4. video version guard method according to claim 1 is characterized in that, describedly adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier to comprise:
Learn the block count M of every frame video pictures according to the single frames video compression format, and to generate length be that the 0-1 sequence of M is as encryption key { s
1..., s
M, this key is as global secret;
In cataloged procedure, video I-frame brightness signal Y in the frame of i piece in every frame picture is carried out discrete cosine transform, to its DC component DY
i, if s
i=1, then
If s
i=0, Y then
iRemain unchanged.
5. video version guard method according to claim 1 is characterized in that, and is described when needs, and the digital finger-print carrier is embedded the digital finger-print sign indicating number; The video information combination rear line issue of adopting different copyright protection modes to protect is comprised:
When being used to ask video information, from preset number fingerprint code database, select a digital fingerprint code to distribute to the user, and with this digital finger-print sign indicating number and user profile binding, the digital finger-print code table is shown { b
1..., b
N, wherein N is a digital finger-print sign indicating number code length;
In cataloged procedure, the digital finger-print sign indicating number is embedded in the described digital finger-print carrier, simultaneously to being embedded with the digital finger-print carrying encryption of digital finger-print sign indicating number;
After partly merging, original video information after the digital finger-print carrier of digital finger-print sign indicating number and the encryption except that digital fingerprint carrier is distributed to the user with being embedded with.
6. video copyright protecting method according to claim 5 is characterized in that, describedly the digital finger-print sign indicating number is embedded into described digital finger-print carrier is:
To each the bit b in the described digital finger-print sign indicating number
i, if b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for negative, then with the coefficient of correspondence negate;
If b
i＞0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, is 1 with the coefficient of correspondence assignment then;
If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is for just, then with the coefficient negate;
If b
i＜0 and the digital finger-print carrier in the needs that comprise embed the piecemeal B of digital finger-print
iThe middle coefficient of selecting is 0, then will be that assignment is-1.
7. video copyright protecting method according to claim 1; it is characterized in that; this method also comprises: user's request comprises the right objects of decryption of video key, and the video distribution square tube is crossed the encryption channel and sent right objects to the user, and the user watches video file after encrypted video is deciphered.
8. video copyright protecting method according to claim 7 is characterized in that, the decruption key that described user utilizes video distribution side to send comprises decryption of video:
Video distribution side authenticates user profile, and authentication sends right objects by rear line, wherein comprises decryption of video key { s
1..., s
M, M is the block count of every frame video pictures;
For i piece DC component DY in every frame picture
i, if s
i=1, DY then
i← DY
i* 2, if s
i=0, Y then
iRemain unchanged.
9. according to claim 1 or 8 described video copyright protecting methods; it is characterized in that; this method also comprises: when having pirate video; extract the digital finger-print carrier in the pirate video; from the digital finger-print carrier that obtains, extract the digital finger-print sign indicating number, and tracing pirate copies user or conspiracy pirate user.
10. video copyright protecting method according to claim 9 is characterized in that, describedly extracts the digital finger-print sign indicating number from the digital finger-print carrier that obtains, and tracing pirate copies user or conspire pirate user and comprise:
Described digital finger-print carrier part is decoded, to each piecemeal B
i, if the coefficient magnitude of wherein selecting is being for just, then corresponding digital finger-print sign indicating number bit b
iBe 1; If wherein the coefficient of selecting is for negative, then corresponding digital finger-print sign indicating number bit is b
iBe 0;
By the tracking performance of digital finger-print sign indicating number and the corresponding relation between user and the digital finger-print sign indicating number, track the pirate copies user or conspire pirate user.
11. a video copyright protecting system is characterized in that, comprises user and video distribution side, wherein,
The user is used for initiating to buy request to video distribution side's entity; To video distribution side's entity requests right objects, encrypted video is deciphered;
Video distribution side's entity is used to issue video product; To video-encryption, generate digital finger-print code data storehouse, embed the digital finger-print sign indicating number in part in as the video of digital finger-print carrier.Also be further used for, extract digital finger-print and tracing pirates in the pirate video.
12. video copyright protecting according to claim 11 system is characterized in that, described video distribution side entity mainly comprises unit, selected cell, the first copyright protected location, second copyright protected location and the assembled unit is set, wherein,
The unit is set, is used to set in advance the pirate digital finger-print code data of the anti-conspiracy storehouse of satisfying performance requirement, described digital finger-print sign indicating number has piracy tracking and collusion piracy tracking performance;
Selected cell is used for selecting the digital finger-print carrier from original video information, to the original video information of first copyright protected location output except that digital fingerprint carrier, to second copyright protected location output digital finger-print carrier;
The first copyright protected location adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier, and the first protection information is exported to assembled unit;
The second copyright protected location when needs, is used to from the digital finger-print sign indicating number that the unit is set the digital finger-print carrier be embedded the copyright protection of digital finger-print sign indicating number, and the second protection information is exported to assembled unit;
Assembled unit with the video information combination of adopting different copyright protection modes to protect, is issued protected video information to the user.
13. video copyright protecting according to claim 12 system is characterized in that the described second copyright protected location is further used for, and the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
14., it is characterized in that described video distribution side entity also comprises according to claim 12 or 13 described video copyright protecting systems:
Tracing unit is used for extracting the fingerprint carrier digital finger-print sign indicating number of pirate video, and according to the binding recording, tracking pirate user of user profile and digital finger-print sign indicating number.
15. video distribution side's entity is characterized in that, mainly comprises unit, selected cell, the first copyright protected location, second copyright protected location and the assembled unit are set, wherein,
The unit is set, is used to set in advance the pirate digital finger-print code data of the anti-conspiracy storehouse of satisfying performance requirement, described digital finger-print sign indicating number has piracy tracking and collusion piracy tracking performance;
Selected cell is used for selecting the digital finger-print carrier from original video information, to the original video information of first copyright protected location output except that digital fingerprint carrier, to second copyright protected location output digital finger-print carrier;
The first copyright protected location adopts cipher mode to carry out copyright protection to the original video information except that digital fingerprint carrier, and the first protection information is exported to assembled unit;
The second copyright protected location when needs, is used to from the digital finger-print sign indicating number that the unit is set the digital finger-print carrier be embedded the copyright protection of digital finger-print sign indicating number, and the second protection information is exported to assembled unit;
Assembled unit with the video information combination of adopting different copyright protection modes to protect, is issued protected video information to the user.
16. video distribution side according to claim 15 entity is characterized in that, the described second copyright protected location is further used for, and the digital finger-print carrier that embeds the digital finger-print sign indicating number is carried out encryption.
17., it is characterized in that described video distribution side entity also comprises according to claim 15 or 16 described video distribution side entities:
Tracing unit is used for extracting the fingerprint carrier digital finger-print sign indicating number of pirate video, and according to the binding recording, tracking pirate user of user profile and digital finger-print sign indicating number.
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