CN102164303B - Video copyright protecting method, system and video distribution side's entity - Google Patents
Video copyright protecting method, system and video distribution side's entity Download PDFInfo
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Abstract
The invention provides a kind of video copyright protecting method, system and video distribution side's entity, including selecting digital finger-print carrier from original video information；Cipher mode is adopted to carry out copyright protection the original video information except digital finger-print carrier；When needed, digital finger-print carrier is embedded digital finger-print code；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued。Numeral in the present invention refers in fingerprint code telescopiny, determines that partial video picture is as fingerprint carrier, decreases the video pictures quantity needing to embed fingerprint according to the code length of digital finger-print code；And the video pictures outside fingerprint carrier compresses in advance, is encrypted and stored in video server。By the inventive method, both reduced computational load during server embedding digital finger-print, and in turn ensure that the digital finger-print code embedding uniqueness in each video copy, enhance the safety of copyright protection。
Description
Technical field
The present invention relates to a kind of video copyright protecting technology, particularly relate to a kind of based on encrypting and the anti-pirate video copyright protecting method of digital finger-print, system and the video distribution side's entity of conspiring。
Background technology
In recent years, highly developed network technology brings to society and numerous has simultaneously also caused very serious problem easily。Resource acquisition technology easily exacerbates the piracy to digital product, including illegally copying and distribution。Copy right piracy destroys the value chain of digital product, the interests of the person that compromises product manufacturing, publication side, publisher and validated user, and the order of network world is constituted serious threat。How digital product is carried out one of copyright protection focus becoming digital times。
Traditional copyright protection technology is typically based on cryptography theory, and its protected mode is that file encryption is become ciphertext, makes disabled user to understand。But the method adopting encryption pointed out disabled user which be important information, it is easy to cause curiosity and attention, make the target of attack of disabled user very clear and definite, thus the probability that encryption file is cracked is greatly increased。Additionally, along with the quick raising of computer process ability, this method improving level of confidentiality by increasing key length becomes more and more dangerous especially。Just in this case, occur in that Information Hiding Techniques, and become digital product, especially the new defence line of multimedia digital product copyright protection。
One of representative as Information Hiding Techniques, Digital Fingerprinting Technology is the new digital product copyright protection technology grown up in recent years。For video, Digital Fingerprinting Technology refers to and embeds unique fingerprint code in the video content of each user, and user identity and digital finger-print binding is stored in sales record data base。
If it find that the video file being copied illegally or issuing, publisher then extracts digital finger-print therein, and utilizes tracing algorithm to follow the trail of the original user being engaged in bootlegging。
For digital video technology, there has also been very big development the more than ten years in past。The development of video compression technology is mainly reflected on the compression standard that some are new, such as MPEGX, H.26X etc.。In addition Web TV is also popularized gradually, and incident is Web TV and HDTV etc.。Seeing on the whole, the Internet communication of efficient compress technique and video is mutually promoted, and constantly advances the development of digital video technology。
If utilizing Digital Fingerprinting Technology that video file is carried out copyright protection, then need to embed digital finger-print code in video content。Consider the use value of video, the process embedding digital finger-print must assure that the sight of video。A kind of feasible solution is embedding digital finger-print code in the compression domain of video, so, can reduce the bandwidth consumption of transmission of video on the one hand, can fully ensure that the quality of video on the other hand in compression domain。
But, compression domain embeds digital finger-print code and there is also some problems。From the character of Digital Fingerprinting Technology it can be seen that video distribution side is necessary for each user distributes a unique video copy。If video being compressed when user asks to buy video and embedding digital finger-print code, this will process load to video server and bring great pressure；If getting out be embedded with the compression video of digital finger-print sender in advance, this can bring bigger storage pressure to video server again。
In sum, at present, digital video carries out copyright protection to be realized by encryption technology or Digital Fingerprinting Technology。But, it is vulnerable to there is safety in encryption technology；But embed digital finger-print code in compression domain and process load and the storage of video server are brought great pressure。
Summary of the invention
In view of this, present invention is primarily targeted at a kind of video copyright protecting method of offer, system and video distribution side's entity, it is possible to strengthen the safety of copyright protection, alleviate process load and storage pressure that copyright protection is brought。
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of video copyright protecting method, including:
Digital finger-print carrier is selected from original video information；
Cipher mode is adopted to carry out copyright protection the original video information except digital finger-print carrier；
When needed, digital finger-print carrier is embedded digital finger-print code；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued。
Described the digital finger-print carrier is selected to be from original video information: to select the quantity of digital finger-print carrier according to digital finger-print code code length, using the original video information selected as digital finger-print carrier。
The described quantity according to digital finger-print code code length selection digital finger-print carrier is:
The bit number b of embeddable fingerprint code in every frame video is determined according to compressed format, the prediction frame number p of adjacent I-interframe, if digital finger-print code code length is N (bit), then need the fingerprint amount vector selected to be at least:Expression is not less thanInteger。
The described original video information to except digital finger-print carrier adopts cipher mode to carry out copyright protection to include:
Learn the block count M of every frame video pictures according to single frame video compressed format, and generate 0-1 sequence that length is M as encryption key { s1,…,sM, this key is as global secret；
In an encoding process, video I-frame luminance signal Y in the frame of i-th piece in every frame picture is carried out discrete cosine transform, to its DC component DYiIf, si=1, thenIf si=0, then DYiRemain unchanged。
Described when needed, to digital finger-print carrier embed digital finger-print code；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued and includes:
When being used for asking video information, select a digital fingerprint code to distribute to user from preset number fingerprint code data base, and by this digital finger-print code and user profile binding, digital finger-print code table is shown as { b1,…,bN, wherein N is digital finger-print code code length；
In an encoding process digital finger-print code is embedded in described digital finger-print carrier, simultaneously to the digital finger-print carrying encryption being embedded with digital finger-print code；
Would be embedded with being distributed to user after the digital finger-print carrier of digital finger-print code merges with the original video information part after the encryption except digital finger-print carrier。
Described digital finger-print code is embedded into described digital finger-print carrier it is:
To each bit b in described digital finger-print codeiIf, bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe coefficient of middle selection is negative, then negated by coefficient of correspondence；
If bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe coefficient of middle selection is 0, then be 1 by coefficient of correspondence assignment；
If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe coefficient of middle selection is just, then negated by coefficient；
If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe coefficient of middle selection is 0, then will be assignment be-1。
The method also includes: user's request comprises the right objects of decryption of video key, and video distribution side sends right objects by encrypting channel to user, and user watches video file after encrypted video is deciphered。
Described user utilizes the decruption key that video distribution side sends that decryption of video is included:
User profile is authenticated by video distribution side, and certification sends right objects by rear line, wherein comprises decryption of video key { s1,…,sM, M is the block count of every frame video pictures；
For i-th piece of DC component DY in every frame pictureiIf, si=1, then DYi←DYi× 2, if si=0, then DYiRemain unchanged。
The method also includes: when there is pirate video, extracts the digital finger-print carrier in pirate video, extracts digital finger-print code from the digital finger-print carrier obtained, and tracing pirate copies user or conspire pirate user。
Described from the digital finger-print carrier obtained extract digital finger-print code, and tracing pirate copies user or conspire pirate user include:
Described digital finger-print carrier part is decoded, to each piecemeal BiIf the coefficient magnitude wherein selected just is, then corresponding digital finger-print code bit biIt is 1；If the coefficient wherein selected is negative, then corresponding digital finger-print code bit is biIt is 0；
By the corresponding relation between the tracking performance of digital finger-print code and user and digital finger-print code, track pirate copies user or conspiracy pirate user。
A kind of video copyright protecting system, including user and video distribution side, wherein,
User, 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 for issuing video product；To video-encryption, generate digital finger-print code data base, the video partly as digital finger-print carrier embeds digital finger-print code。It is further used for, extracts the digital finger-print in pirate video tracing pirates。
Described video distribution side entity mainly includes arranging unit, selecting unit, the first copyright protected location, the second copyright protected location and assembled unit, wherein,
Arranging unit, for pre-setting the pirate digital finger-print code data base of anti-conspiracy meeting performance requirement, described digital finger-print code has piracy tracking and collusion piracy tracking performance；
Select unit, for selecting digital finger-print carrier from original video information, to the original video information that the first copyright protected location exports except digital finger-print carrier, export digital finger-print carrier to the second copyright protected location；
First copyright protected location, adopts cipher mode to carry out copyright protection the original video information except digital finger-print carrier, and exports the first protection information to assembled unit；
Second copyright protected location, when needed, utilizes from the copyright protection arranging the digital finger-print code of unit and carry out digital finger-print carrier embedding digital finger-print code, and exports the second protection information to assembled unit；
Assembled unit, the video information combination that different copyright protection mode will be adopted to carry out protecting, issue protected video information to user。
Described second copyright protected location is further used for, and the digital finger-print carrier embedding digital finger-print code is encrypted。
Described video distribution side entity also includes:
Tracing unit, for extracting digital finger-print code in the fingerprint carrier of pirate video, and the binding recording, tracking pirate user according to user profile Yu digital finger-print code。
A kind of video distribution side entity, mainly includes arranging unit, selecting unit, the first copyright protected location, the second copyright protected location and assembled unit, wherein,
Arranging unit, for pre-setting the pirate digital finger-print code data base of anti-conspiracy meeting performance requirement, described digital finger-print code has piracy tracking and collusion piracy tracking performance；
Select unit, for selecting digital finger-print carrier from original video information, to the original video information that the first copyright protected location exports except digital finger-print carrier, export digital finger-print carrier to the second copyright protected location；
First copyright protected location, adopts cipher mode to carry out copyright protection the original video information except digital finger-print carrier, and exports the first protection information to assembled unit；
Second copyright protected location, when needed, utilizes from the copyright protection arranging the digital finger-print code of unit and carry out digital finger-print carrier embedding digital finger-print code, and exports the second protection information to assembled unit；
Assembled unit, the video information combination that different copyright protection mode will be adopted to carry out protecting, issue protected video information to user。
Described second copyright protected location is further used for, and the digital finger-print carrier embedding digital finger-print code is encrypted。
Described video distribution side entity also includes:
Tracing unit, for extracting digital finger-print code in the fingerprint carrier of pirate video, and the binding recording, tracking pirate user according to user profile Yu digital finger-print code。
According to the code length of digital finger-print code, the technical scheme provided from the invention described above, it can be seen that refer to fingerprint code telescopiny in the numeral of the present invention, determines that partial video picture is as fingerprint carrier, decreases the video pictures quantity needing to embed fingerprint；And the video pictures outside fingerprint carrier compresses in advance, is encrypted and stored in video server。By the inventive method, both reduced computational load during server embedding digital finger-print, and in turn ensure that the digital finger-print code embedding uniqueness in each video copy, enhance the safety of copyright protection。
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention realizes video copyright protecting method；
Fig. 2 is the composition structural representation that the present invention realizes video distribution side's entity in video copyright protecting system；
Fig. 3 is the flow chart that video file is carried out the embodiment of copyright protection by video distribution side of the present invention；
Fig. 4 is video-encryption of the present invention and the schematic diagram of numeral fingerprint embedding embodiment；
Fig. 5 is the flow chart that user of the present invention buys the embodiment of video, request right objects and decryption of video to publisher；
Fig. 6 is the flow chart that pirate video is carried out the embodiment of piracy tracking by video distribution side of the present invention。
Detailed description of the invention
Fig. 1 is the flow chart that the present invention realizes video copyright protecting method, as it is shown in figure 1, include:
Step 100: select digital finger-print carrier from original video information。
Also include before this step: video distribution side pre-sets (generation) and meets the pirate digital finger-print code data base of anti-conspiracy of performance requirement。Digital finger-print code and user profile binding, digital finger-print code has piracy tracking and collusion piracy tracking performance。
In this step, the method selecting digital finger-print carrier from original video information such as picture can be the quantity selecting digital finger-print carrier according to digital finger-print code code length, generally comprise: determine the bit number b of embeddable fingerprint code in every frame video according to compressed format, the prediction frame number p of adjacent I-interframe, if digital finger-print code code length is N (bit), then the fingerprint amount vector selected is needed to be at least:Expression is not less thanInteger。
Such as digital finger-print code code length is 1000, and video compress picture is cif (320 × 288), and during picture compression, piecemeal is of a size of 16 × 16, then total in every picturesIndividual piecemeal。If embedding numeral 1bit fingerprint code in each piecemeal, then the digital finger-print amount vector needed isNamely from all original video pictures, 3 are selected as digital finger-print carrier。Selection can be random, it is also possible to is select according to the selection strategy pre-set。
Step 101: adopt cipher mode to carry out copyright protection the original video information except digital finger-print carrier。
Original video information except digital finger-print carrier such as picture is compressed coding, encrypts and store by this step, including:
Learn the block count M of every frame video pictures according to single frame video compressed format, and generate 0-1 sequence that length is M as encryption key { s1,…,sM, this key is as global secret, and namely each video file, every frame video pictures adopt this encryption key；Encryption realizes in an encoding process, and adopt slight encryption method, namely according to key sequence, the DC component of " in frame " video (I-frame) luminance signal (Y) is carried out recoverable " destruction ", method particularly includes: the Y-signal of i-th piece in every frame picture is carried out discrete cosine transform (DCT, discretecosinetransformation), to its DC component DYiIf, si=1, thenIf si=0, then DYiRemain unchanged。
Same for cif form, if the piecemeal number in every pictures is 360, then generating length is that the 0-1 sequence of 360 is as encryption key { s1,…,s360, this key is as global secret, and namely each video file, every frame video pictures adopt this encryption key；
Encryption realizes in an encoding process, slight encryption method can be adopted, namely according to key sequence, the DC component of video in frame (I-frame) luminance signal (Y) is carried out recoverable " destruction ", concrete grammar is substantially: the Y-signal of i-th piece in every frame picture is carried out discrete cosine transform (DCT, discretecosinetransformation), i={1 ..., 360}。To its DC component DYiIf, si=1, thenI.e. DYiIt is equal toIf si=0, then DYiRemain unchanged。
Step 102: when needed, embeds digital finger-print code to digital finger-print carrier；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued。
Further, the digital finger-print carrier embedding digital finger-print code is encrypted。
Numeral in the present invention refers in fingerprint code telescopiny, determines that partial video picture is as fingerprint carrier, decreases the video pictures quantity needing to embed fingerprint according to the code length of digital finger-print code；And the video pictures outside fingerprint carrier compresses in advance, is encrypted and stored in video server。By the inventive method, both reduced computational load during server embedding digital finger-print, and in turn ensure that the digital finger-print code embedding uniqueness in each video copy, enhance the safety of copyright protection。
For the inventive method, also provide for a kind of video copyright protecting system, including user and video distribution side, wherein,
User, 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 for issuing video product；To video-encryption, generate digital finger-print code data base, the video partly as digital finger-print carrier embeds digital finger-print code。It is further used for, extracts the digital finger-print in pirate video tracing pirates。
Fig. 2 is the composition structural representation that the present invention realizes video distribution side's entity in video copyright protecting system; as shown in Figure 2; video distribution side's entity mainly includes arranging unit, selecting unit, the first copyright protected location, the second copyright protected location and assembled unit, wherein
Arranging unit, be used for pre-setting (generation) and meet the pirate digital finger-print code data base of anti-conspiracy of performance requirement, described digital finger-print code has piracy tracking and collusion piracy tracking performance。
Select unit, for selecting digital finger-print carrier from original video information, to the original video information that the first copyright protected location exports except digital finger-print carrier, export digital finger-print carrier to the second copyright protected location。
First copyright protected location, adopts cipher mode to carry out copyright protection the original video information except digital finger-print carrier, and exports the first protection information to assembled unit。
Second copyright protected location, when needed, utilizes from the copyright protection arranging the digital finger-print code of unit and carry out digital finger-print carrier embedding digital finger-print code, and exports the second protection information to assembled unit。Second copyright protected location is further used for, and the digital finger-print carrier embedding digital finger-print code is encrypted。
Assembled unit, the video information combination that different copyright protection mode will be adopted to carry out protecting, issue protected video information to user。
Video distribution side's entity also includes tracing unit, for extracting digital finger-print code in the fingerprint carrier of pirate video, and the binding recording, tracking pirate user according to user profile Yu digital finger-print code。
Below in conjunction with embodiment, the inventive method is described in detail。
Fig. 3 is the flow chart that video file is carried out the embodiment of copyright protection by video distribution side of the present invention, as it is shown on figure 3, include:
Step 300: select partial video information as digital finger-print carrier from original video picture。
Publisher selects the quantity of digital finger-print carrier according to fingerprint code code length, such as:
Fingerprint code code length is 1000, and video compress picture is cif (320 × 288), and during picture compression, piecemeal is of a size of 16 × 16, then every pictures hasIndividual piecemeal。If embedding numeral 1bit fingerprint code in each piecemeal, then the digital finger-print amount vector needed isNamely 3 in all video pictures are selected as digital finger-print carrier。
Step 3011: the video pictures except digital finger-print carrier is compressed coding, encrypts and store it in server end by video distribution side。Same for cif form:
Piecemeal number in every pictures is 360, then generating length is that the 0-1 sequence of 360 is as encryption key { s1,…,s360, this key is as global secret, and namely each video file, every frame video pictures adopt this encryption key；
Encryption realizes in an encoding process, and adopt slight encryption method, namely according to key sequence, the DC component of " in frame " video (I-frame) luminance signal (Y) is carried out recoverable " destruction ", method particularly includes: the Y-signal of i-th piece in every frame picture is carried out dct transform, i={1, ..., 360}。To its DC component DYiIf, si=1, thenIf si=0, then DYiRemain unchanged；
Step 3021～step 3023: after user buys product to the request of video distribution side, video distribution side pirate digital finger-print code data base, distributes numeral fingerprint code for user from anti-conspiracy theing meet performance requirement previously generated；In digital finger-print carrier, embed digital finger-print code and it is encrypted。Wherein, the digital finger-print code of selection has piracy tracking and collusion piracy tracking performance。
Step 303: digital finger-print carrier is issued with remainder combination rear line。
Fig. 4 is the schematic diagram of the embodiment that digital video fingerprint code of the present invention embeds and encrypts, in the present embodiment, it is assumed that video distribution side selects the digital finger-print code distributing to user to be { b in digital finger-print code data base1,…,b1000; wherein the code length of fingerprint code is 1000; be embedded in digital finger-print carrier by digital finger-print code in an encoding process, consider only to embed 1bit digital finger-print code here in each piecemeal, then the piecemeal needing to embed digital finger-print comprised in digital finger-print carrier has 1000 { B1,…,B1000}；Dct transform coefficient to each piecemeal, in the present embodiment, is worth AC [0] as embedded location using the first of the AC compounent of dct transform coefficient。Dct transform coefficient to each piecemeal, according to human visual system, selects wherein to the visual system insensitive part coefficient embedded location as fingerprint bit, and in order to not produce conflict with ciphering process, the coefficient of selection should get rid of DC component。
For bit b each in digital finger-print codei, i is 1,2,3 ... N, if bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe coefficient of middle selection is negative, then negated by coefficient of correspondence；If bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe coefficient of middle selection is 0, then be 1 by coefficient of correspondence assignment；If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe coefficient of middle selection is just, then negated by coefficient；If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe coefficient of middle selection is 0, then will be assignment be-1。B is guaranteed by this operationiThe positive negativity of middle coefficient of correspondence and biValue consistent。Idiographic flow as shown in Figure 4, including:
Step 400: judge biWhether equal to 1, if bi=1, then enter step 4011；Otherwise enter step 4021。
Step 4011: judge BiMiddle ACi[0] whether less than 0, if ACi[0] < 0, then enter step 4012；Otherwise enter step 4013。
Step 4012:ACi[0] AC it is assigned to after negatingi[0], i.e. ACi[0]←-ACi[0], step 403 is entered。
Step 4013: judge BiMiddle ACi[0] whether equal to 0, if ACi[0]=0, then enter step 4014；Otherwise enter step 403。
Step 4014:ACi[0] value is 1, enters step 403 afterwards。
Step 4021: judge BiMiddle ACi[0] whether more than 0, if ACi[0] > 0, then enter step 4022；Otherwise enter step 4023。
Step 4022:ACi[0] AC it is assigned to after negatingi[0], i.e. ACi[0]←-ACi[0], step 403 is entered。
Step 4023: judge BiMiddle ACi[0] whether equal to 0, if ACi[0]=0, then enter step 4024；Otherwise enter step 403。
Step 4024:ACi[0] value is-1, enters step 403 afterwards。
Step 403:i enters step 404 after adding 1。
Step 404: judge that whether i is more than N, if more than, then enter step 405；Otherwise return step 400。
Step 405: utilize the digital finger-print carrying encryption to being embedded with digital finger-print code of the method in step 3011。
Fig. 5 is the flow chart that user of the present invention buys the embodiment of video, request right objects and decryption of video to publisher, as it is shown in figure 5,
Step 500: when user asks to buy video information, video distribution side confirms user profile。
Step 501: judge to user profile be confirmed whether pass through, if passed through, enter step 502, otherwise enter step 507。
Step 502: video distribution side distributes numeral fingerprint code for user and preserves to sales record。
Step 503: embed the digital finger-print code of distribution in digital finger-print carrier, and be distributed to user after the other parts combination in the video information of the digital finger-print carrier with request that embed digital finger-print code。
Step 504: user comprises decryption of video key { s to the request of video distribution side1,…,sMRight objects, video distribution side confirm user profile。
Step 505: judge to user profile be confirmed whether pass through, if passed through, enter step 506, otherwise enter step 507。
Step 506: video distribution side sends right objects by encrypting channel to user, and user receives right objects and to decryption of video。For cif form, user side in video decoding process, the luminance signal of the focus attentions equally on I-each piecemeal of frame picture, its DCT DC component is deciphered, concrete grammar: to i-th piece of DC component DY in every frame pictureiIf, si=1, then DYi←DYi× 2, if si=0, then DYiRemain unchanged。
Step 507: process ends。
Transaction flow between user and the video distribution side of the present invention as shown in Figure 5; user buys product to the request of video distribution side and provides associated personal information, and after obtaining shielded video file, user also needs to ask right objects could watch video to publisher。Video distribution process in the present invention can the existing DRM standard of seamless access。
Fig. 6 is the flow chart that pirate video is carried out the embodiment of piracy tracking by video distribution side of the present invention, as shown in Figure 6, and including:
Step 600: video distribution side detects pirate video product on network。
Piracy tracking process in conjunction with prior aries such as the file detection in network, data minings, actively can excavate pirate video copy, then tracing pirates from internet data。
Step 601～step 602: video distribution side extracts the digital finger-print carrier in pirate video, and extracts digital finger-print code from the digital finger-print carrier obtained。
Digital finger-print carrier part being decoded, pays close attention to the DCT coefficient of I-frame piecemeal in decoding process, the piecemeal of concern is { B1,…,B1000}。According to telescopiny, in this step, the extracting method of digital finger-print code is: to each piecemeal BiIf, ACi[0] > 0, then corresponding digital finger-print code bit bi=1；If ACi[0] < 0, then corresponding digital finger-print code bit is bi=0。
Step 603: by the tracking performance of digital finger-print code, and the corresponding relation between user and digital finger-print code, it is possible to track pirate copies user or conspiracy pirate user。
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention。
Claims (12)
1. a video copyright protecting method, it is characterised in that including:
The quantity of digital finger-print carrier is selected, using the original video information selected as digital finger-print carrier according to digital finger-print code code length；
Cipher mode is adopted to carry out copyright protection the original video information except digital finger-print carrier；
When needed, digital finger-print carrier is embedded digital finger-print code；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued。
2. video copyright protecting method according to claim 1, it is characterised in that the described quantity according to digital finger-print code code length selection digital finger-print carrier is:
The bit number b of embeddable fingerprint code in every frame video is determined according to compressed format, the prediction frame number p of adjacent I-interframe, if digital finger-print code code length is N (bit), then need the fingerprint amount vector selected to be at least: Expression is not less thanInteger。
3. video copyright protecting method according to claim 1, it is characterised in that the described original video information to except digital finger-print carrier adopts cipher mode to carry out copyright protection to include:
Learn the block count M of every frame video pictures according to single frame video compressed format, and generate 0-1 sequence that length is M as encryption key { s1,…,sM, this key is as global secret；
In an encoding process, video I-frame luminance signal Y in the frame of i-th piece in every frame picture is carried out discrete cosine transform, to its DC component DYiIf, si=1, thenIf si=0, then DYiRemain unchanged, wherein,Represent Expression is not less thanInteger, YiRepresent video I-frame luminance signal Y, DY in the frame of i-th pieceiRepresent YiDC component。
4. video copyright protecting method according to claim 1, it is characterised in that described when needed, to digital finger-print carrier embed digital finger-print code；The video information combination rear line adopting different copyright protection mode to carry out protecting is issued and includes:
When being used for asking video information, select a digital fingerprint code to distribute to user from preset number fingerprint code data base, and by this digital finger-print code and user profile binding, digital finger-print code table is shown as { b1,…, bN, wherein N is digital finger-print code code length；
In an encoding process digital finger-print code is embedded in described digital finger-print carrier, simultaneously to the digital finger-print carrying encryption being embedded with digital finger-print code；
Would be embedded with being distributed to user after the digital finger-print carrier of digital finger-print code merges with the original video information part after the encryption except digital finger-print carrier。
5. video copyright protecting method according to claim 4, it is characterised in that described digital finger-print code is embedded into described digital finger-print carrier is:
To each bit b in described digital finger-print codeiIf, bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe discrete cosine transform coefficient of middle selection is negative, then correspondence DCT coefficient negated；
If bi> 0 and digital finger-print carrier in comprise need embed digital finger-print piecemeal BiThe DCT coefficient of middle selection is 0, then be 1 by correspondence DCT coefficient assignment；
If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe DCT coefficient of middle selection is just, then DCT coefficient negated；
If bi< 0 and digital finger-print carrier comprises need embed digital finger-print piecemeal BiThe DCT coefficient of middle selection is 0, then be-1 by DCT coefficient assignment。
6. video copyright protecting method according to claim 1; it is characterized in that; the method also includes: user's request comprises the right objects of decryption of video key, and video distribution side sends right objects by encrypting channel to user, and user watches video file after encrypted video is deciphered。
7. video copyright protecting method according to claim 6, it is characterised in that described user utilizes the decruption key that video distribution side sends that decryption of video is included:
User profile is authenticated by video distribution side, and certification sends right objects by rear line, wherein comprises decryption of video key { s1,…,sM, M is the block count of every frame video pictures；
For i-th piece of DC component DY in every frame pictureiIf, si=1, then DYi←DYi× 2, if si=0, then DYiRemain unchanged, wherein, DYi←DYi× 2 represent DYi=DYi× 2, YiRepresent video I-frame luminance signal Y, DY in the frame of i-th pieceiRepresent YiDC component。
8. the video copyright protecting method according to claim 1 or 7; it is characterized in that; the method also includes: when there is pirate video; extract the digital finger-print carrier in pirate video; from the digital finger-print carrier obtained extract digital finger-print code, and tracing pirate copies user or conspire pirate user。
9. video copyright protecting method according to claim 8, it is characterised in that described from the digital finger-print carrier obtained extract digital finger-print code, and tracing pirate copies user or conspire pirate user include:
Described digital finger-print carrier part is decoded, to each piecemeal BiIf the DCT coefficient wherein selected just is sized to, then corresponding digital finger-print code bit biIt is 1；If the DCT coefficient wherein selected is negative, then corresponding digital finger-print code bit is biIt is 0；
By the corresponding relation between the tracking performance of digital finger-print code and user and digital finger-print code, track pirate copies user or conspiracy pirate user。
10. video distribution side's entity, it is characterised in that mainly include arranging unit, selecting unit, the first copyright protected location, the second copyright protected location and assembled unit, wherein,
Arranging unit, for pre-setting the pirate digital finger-print code data base of anti-conspiracy meeting performance requirement, described digital finger-print code has piracy tracking and collusion piracy tracking performance；
Select unit; for selecting the quantity of digital finger-print carrier according to digital finger-print code code length; using the original video information selected as digital finger-print carrier, to first copyright protected location output original video information except digital finger-print carrier, export digital finger-print carrier to the second copyright protected location；
First copyright protected location, adopts cipher mode to carry out copyright protection the original video information except digital finger-print carrier, and exports the first protection information to assembled unit；
Second copyright protected location, when needed, utilizes from the copyright protection arranging the digital finger-print code of unit and carry out digital finger-print carrier embedding digital finger-print code, and exports the second protection information to assembled unit；
Assembled unit, the video information combination that different copyright protection mode will be adopted to carry out protecting, issue protected video information to user。
11. video distribution side according to claim 10 entity, it is characterised in that described second copyright protected location is further used for, the digital finger-print carrier embedding digital finger-print code is encrypted。
12. the video distribution side's entity according to claim 10 or 11, it is characterised in that described video distribution side entity also includes:
Tracing unit, for extracting digital finger-print code in the fingerprint carrier of pirate video, and the binding recording, tracking pirate user according to user profile Yu digital finger-print code。
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| CN105095691B (en) * | 2014-04-24 | 2019-11-22 | 厦门简帛信息科技有限公司 | A kind of method and apparatus sending digital publication |
| CN105657453A (en) * | 2015-12-29 | 2016-06-08 | 华为技术有限公司 | Method and device for protecting video by digital fingerprinting technology |
| CN109996020B (en) * | 2017-12-29 | 2021-08-13 | 华为技术有限公司 | Video recording method and device |
| CN108494732B (en) * | 2018-02-09 | 2021-07-06 | 浙江新再灵科技股份有限公司 | Intelligent screen video playing tamper-proof system based on digital fingerprints |
| CN114363545B (en) * | 2021-12-28 | 2022-10-25 | 北京流金岁月传媒科技股份有限公司 | 4K ultra-high-definition decoding device supporting fingerprint embedding and fingerprint embedding method |
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