CN102164303A - Video copyright protection method and system as well as video publisher entity - Google Patents

Abstract

The invention provides a video copyright protection method, system and video publisher entity, including selecting a digital fingerprint carrier from the original video information; encrypting the original video information except the digital fingerprint carrier for copyright protection; when necessary, Embed the digital fingerprint code into the digital fingerprint carrier; combine the video information protected by different copyright protection methods and release it to the user. In the embedding process of the digital fingerprint code of the present invention, according to the code length of the digital fingerprint code, part of the video pictures is determined as the fingerprint carrier, which reduces the number of video pictures that need to be embedded in the fingerprint; and the video pictures other than the fingerprint carrier are pre-compressed, encrypted and stored in the video server. Through the method of the invention, the computing load when the server embeds digital fingerprints is reduced, and a unique digital fingerprint code is embedded in each video copy, thereby enhancing the security of copyright protection.

Description

Video copyright protection method, system and video publisher entity

technical field

The invention relates to a video copyright protection technology, in particular to a video copyright protection method, system and video publisher entity based on encryption and anti-collusion piracy digital fingerprints.

Background technique

In recent years, the highly developed network technology has brought many conveniences to the society, but it has also caused very serious problems. Facilitated access to resources facilitates digital piracy, including illegal copying and distribution. Piracy has destroyed the value chain of digital products, damaged the interests of product manufacturers, publishers, issuers and legal users, and constituted a serious threat to the order of the network world. How to carry out copyright protection on digital products has become one of the focuses in the digital age.

Traditional copyright protection technology is usually based on cryptography theory, and its protection method is to encrypt files into ciphertext, so that illegal users cannot read them. However, the encryption method reminds illegal users of important information, which is easy to arouse curiosity and attention, and makes the attack target of illegal users very clear, so the possibility of encrypted files being cracked is greatly increased. In addition, with the rapid improvement of computer processing power, this method of increasing the encryption level by increasing the length of the key is becoming more and more insecure. It is under such circumstances that information hiding technology appears and becomes a new line of defense for copyright protection of digital products, especially multimedia digital products.

As one of the representatives of information hiding technology, digital fingerprint technology is a new digital product copyright protection technology developed in recent years. Taking video as an example, digital fingerprint technology refers to embedding a unique fingerprint code in each user's video content, and binding and storing user identity and digital fingerprint into the sales record database.

If an illegally copied or distributed video file is found, the publisher will extract its digital fingerprint and use a tracking algorithm to trace the original user who engaged in illegal copying.

For digital video technology, there has also been great development in the past ten years. The development of video compression technology is mainly reflected in some new compression standards, such as MPEG X, H.26X and so on. In addition, Internet TV is becoming more and more popular, accompanied by Internet TV and high-definition TV. On the whole, high-efficiency compression technology and video network transmission promote each other and continuously promote the development of digital video technology.

If digital fingerprint technology is used to protect the copyright of video files, digital fingerprint codes need to be embedded in the video content. Considering the use value of the video, it is necessary to ensure the viewing quality of the video during the process of embedding digital fingerprints. A feasible solution is to embed digital fingerprint codes in the compressed domain of the video. In this way, on the one hand, the bandwidth consumption of video transmission can be reduced, and on the other hand, the quality of the video can be fully guaranteed in the compressed domain.

However, there are also some problems in embedding digital fingerprint codes in the compressed domain. It can be seen from the nature of digital fingerprint technology that video publishers must distribute a unique copy of the video to each user. If the video is compressed and embedded with a digital fingerprint code when the user requests to purchase the video, this will bring great pressure to the processing load of the video server; The video server brings great storage pressure.

To sum up, at present, digital video copyright protection can be realized through encryption technology or digital fingerprint technology. However, encryption technology is vulnerable to security attacks; however, embedding digital fingerprint codes in the compressed domain has brought great pressure on the processing load and storage of video servers.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a video copyright protection method, system and video publisher entity, which can enhance the security of copyright protection and reduce the processing load and storage pressure caused by copyright protection.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A video copyright protection method, comprising:

Select digital fingerprint carrier from original video information;

Encrypt the original video information except the digital fingerprint carrier for copyright protection;

When needed, digital fingerprint codes are embedded in the digital fingerprint carrier; video information protected by different copyright protection methods is combined and released to users.

The selection of the digital fingerprint carrier from the original video information is: selecting the number of digital fingerprint carriers according to the code length of the digital fingerprint, and using the selected original video information as the digital fingerprint carrier.

The number of digital fingerprint carriers selected according to the digital fingerprint code length is:

表示不小于的整数。Determine the bit number b of the fingerprint code that can be embedded in each frame of video according to the compression format, and the number of predicted frames p between adjacent I-frames. If the digital fingerprint code length is N (bit), the number of fingerprint carriers that need to be selected at least:

means not less than an integer of .

The encryption method for copyright protection of the original video information except the digital fingerprint carrier includes:

According to the single-frame video compression format, the block number M of each frame of video pictures is learned, and a 0-1 sequence with a length of M is generated as an encryption key {s ₁ ,...,s _M }, and the key is used as a global key;

若s_i＝0，则Y_i保持不变。In the encoding process, discrete cosine transform is performed on the intra-frame video I-frame luminance signal Y of the i-th block in each frame of pictures, and its DC component DY _i , if s _i =1, then

If s _i =0, then Y _i remains unchanged.

When needed, embedding the digital fingerprint code on the digital fingerprint carrier; combining the video information protected by different copyright protection methods and publishing to the user includes:

When used to request video information, select a digital fingerprint code from the preset digital fingerprint code database and assign it to the user, and bind the digital fingerprint code with user information. The digital fingerprint code is expressed as {b ₁ ,...,b _N }, where N is the length of the digital fingerprint code;

Embedding the digital fingerprint code into the digital fingerprint carrier during the encoding process, and simultaneously encrypting the digital fingerprint carrier embedded with the digital fingerprint code;

The digital fingerprint carrier embedded with the digital fingerprint code is combined with the encrypted original video information part except the digital fingerprint carrier, and released to the user.

The digital fingerprint code is embedded into the digital fingerprint carrier as follows:

For each bit b _i in the digital fingerprint code, if b _i > 0 and the coefficient selected in the block B _i that needs to be embedded in the digital fingerprint contained in the digital fingerprint carrier is negative, then the corresponding coefficient is reversed;

If b _i >0 and the coefficient selected in the block B _i contained in the digital fingerprint carrier that needs to embed the digital fingerprint is 0, assign the corresponding coefficient to 1;

If b _i < 0 and the coefficient selected in the block B _i contained in the digital fingerprint carrier that needs to embed the digital fingerprint is positive, the coefficient is reversed;

If b _i <0 and the coefficient selected in the block B _i contained in the digital fingerprint carrier that needs to embed the digital fingerprint is 0, then assign the value -1.

The method also includes: the user requests a copyright object containing a video decryption key, the video publisher sends the copyright object to the user through an encrypted channel, and the user decrypts the encrypted video to watch the video file.

The user uses the decryption key sent by the video publisher to decrypt the video including:

The video publisher authenticates the user information, and sends the copyright object to the user after the authentication is passed, which contains the video decryption key {s ₁ ,...,s _M }, where M is the number of blocks of each video frame;

For the DC component DY _i of the i-th block in each frame of pictures, if s _i =1, then DY _i ←DY _i ×2, and if s _i =0, then Y _i remains unchanged.

The method also includes: when there is a pirated video, extracting the digital fingerprint carrier in the pirated video, extracting the digital fingerprint code from the obtained digital fingerprint carrier, and tracking the pirated copy user or the colluding pirated user.

The extraction of digital fingerprint codes from the obtained digital fingerprint carrier, and tracking pirated copy users or colluding pirate users includes:

Decoding the digital fingerprint carrier part, for each block B _i , if the selected coefficient size is positive, the corresponding digital fingerprint code bit b _i is 1; if the selected coefficient is negative, the corresponding digital Fingerprint code bit is b _i is 0;

Through the tracking performance of the digital fingerprint code and the corresponding relationship between the user and the digital fingerprint code, the pirated copy user or the colluding pirated user can be traced.

A video copyright protection system, including users and video publishers, wherein,

User, used to initiate a purchase request to the video publisher entity; request a copyright object from the video publisher entity, and decrypt the encrypted video;

The video publisher entity is used to publish video products; encrypt the video, generate a digital fingerprint code database, and embed digital fingerprint codes in some videos as digital fingerprint carriers. It is further used to extract digital fingerprints in pirated videos and track pirates.

The video publisher entity mainly includes a setting unit, a selection unit, a first copyright protection unit, a second copyright protection unit and a combination unit, wherein,

The setting unit is used to pre-set the anti-collusion piracy digital fingerprint code database that meets the performance requirements, and the digital fingerprint code has piracy tracking and collusion piracy tracking performance;

The selection unit is used to select the digital fingerprint carrier from the original video information, output the original video information except the digital fingerprint carrier to the first copyright protection unit, and output the digital fingerprint carrier to the second copyright protection unit;

The first copyright protection unit performs copyright protection on the original video information except the digital fingerprint carrier by means of encryption, and outputs the first protection information to the combination unit;

The second copyright protection unit, when needed, uses the digital fingerprint code from the setting unit to perform copyright protection embedded in the digital fingerprint code on the digital fingerprint carrier, and outputs the second protection information to the combination unit;

The combination unit combines the video information protected by different copyright protection methods, and releases the protected video information to the user.

The second copyright protection unit is further configured to encrypt the digital fingerprint carrier embedded with the digital fingerprint code.

The video publisher entity also includes:

The tracking unit is used to extract the digital fingerprint code in the fingerprint carrier of the pirated video, and track the pirate user according to the binding record of the user information and the digital fingerprint code.

A video publisher entity mainly includes a setting unit, a selection unit, a first copyright protection unit, a second copyright protection unit and a combination unit, wherein,

The setting unit is used to pre-set the anti-collusion piracy digital fingerprint code database that meets the performance requirements, and the digital fingerprint code has piracy tracking and collusion piracy tracking performance;

The selection unit is used to select the digital fingerprint carrier from the original video information, output the original video information except the digital fingerprint carrier to the first copyright protection unit, and output the digital fingerprint carrier to the second copyright protection unit;

The first copyright protection unit performs copyright protection on the original video information except the digital fingerprint carrier by means of encryption, and outputs the first protection information to the combination unit;

The second copyright protection unit, when needed, uses the digital fingerprint code from the setting unit to perform copyright protection embedded in the digital fingerprint code on the digital fingerprint carrier, and outputs the second protection information to the combination unit;

The combination unit combines the video information protected by different copyright protection methods, and releases the protected video information to the user.

The second copyright protection unit is further configured to encrypt the digital fingerprint carrier embedded with the digital fingerprint code.

The video publisher entity also includes:

The tracking unit is used to extract the digital fingerprint code in the fingerprint carrier of the pirated video, and track the pirate user according to the binding record of the user information and the digital fingerprint code.

As can be seen from the technical solution provided by the present invention above, in the digital fingerprint code embedding process of the present invention, according to the code length of the digital fingerprint code, part of the video pictures is determined as the fingerprint carrier, which reduces the number of video pictures that need to embed fingerprints; and The video pictures outside the fingerprint carrier are pre-compressed, encrypted and stored in the video server. Through the method of the invention, the computing load when the server embeds digital fingerprints is reduced, and a unique digital fingerprint code is embedded in each video copy, thereby enhancing the security of copyright protection.

Description of drawings

Fig. 1 is the flow chart that the present invention realizes video copyright protection method;

Fig. 2 is a schematic diagram of the composition structure of the video publisher entity in the video copyright protection system realized by the present invention;

Fig. 3 is the flow chart of the embodiment that the video issuer of the present invention carries out copyright protection to the video file;

Fig. 4 is the schematic diagram of embodiment of video encryption and digital fingerprint embedding of the present invention;

Fig. 5 is a flowchart of an embodiment of the present invention in which a user purchases a video from a publisher, requests a copyright object, and decrypts the video;

Fig. 6 is a flow chart of an embodiment of tracking pirated videos by a video publisher according to the present invention.

Detailed ways

Fig. 1 is the flowchart that realizes video copyright protection method of the present invention, as shown in Fig. 1, comprises:

Step 100: Select a digital fingerprint carrier from the original video information.

This step also includes before this step: the video publisher pre-sets (generates) an anti-collusion piracy digital fingerprint database that meets performance requirements. The digital fingerprint code is bound with user information, and the digital fingerprint code has the performance of piracy tracking and conspiracy piracy tracking.

表示不小于

的整数。In this step, the method of selecting the digital fingerprint carrier from the original video information such as a picture may be to select the number of digital fingerprint carriers according to the digital fingerprint code length, which roughly includes: determining the bits of the fingerprint code that can be embedded in each frame of video according to the compressed format Number b, the predicted frame number p between adjacent I-frames, if the digital fingerprint code code length is N (bits), then the number of fingerprint carriers that need to be selected is at least:

means not less than

an integer of .

即从所有原始视频图片中选择出3张作为数字指纹载体。选择可以是随机的，也可以是按照预先设置的选择策略进行选择。For example, the code length of the digital fingerprint code is 1000, the video compression picture is cif (320×288), and the block size of the picture compression is 16×16, then each picture has a total of $\frac{320\&times;288}{16\&times;16}=360$ blocks. If a digital 1-bit fingerprint code is embedded in each block, the number of digital fingerprint carriers required is

That is, 3 pictures are selected from all original video pictures as digital fingerprint carriers. The selection can be random or according to a preset selection strategy.

Step 101: Encrypt the original video information except the digital fingerprint carrier for copyright protection.

This step compresses, encodes, encrypts and stores the original video information other than the digital fingerprint carrier, such as pictures, including:

若s_i＝0，则Y_i保持不变。According to the single-frame video compression format, the block number M of each frame of video pictures is obtained, and a 0-1 sequence of length M is generated as an encryption key {s ₁ ,...,s _M }, which is used as a global key, namely Each video file and each frame of video picture adopts the encryption key; the encryption is realized in the encoding process, and a mild encryption method is adopted, that is, the "intra-frame" video (I-frame) luminance signal ( The DC component of Y) is recoverable "destroyed". The specific method is: perform discrete cosine transformation (DCT, discrete cosine transformation) on the Y signal of the i-th block in each frame of the picture, and its DC component DY _i , if s _i = 1, then

If s _i =0, then Y _i remains unchanged.

Also take the cif format as an example, if the number of blocks in each picture is 360, then generate a 0-1 sequence with a length of 360 as the encryption key {s ₁ ,...,s ₃₆₀ }, which is used as the global key Key, that is, each video file and each frame of video picture adopts the encryption key;

即DY_i等于

若s_i＝0，则DY_i保持不变。Encryption is implemented in the encoding process, and a mild encryption method can be used, that is, according to the key sequence, the DC component of the intra-frame video (I-frame) luminance signal (Y) can be recovered and "destroyed". The specific method is roughly as follows: Discrete cosine transformation (DCT, discrete cosine transformation) is performed on the Y signal of the i-th block in each frame of pictures, i={1, . . . , 360}. For its DC component DY _i , if s _i =1, then

That is, DY _i is equal to

If s _i =0, then DY _i remains unchanged.

Step 102: When necessary, embed the digital fingerprint code in the digital fingerprint carrier; combine the video information protected by different copyright protection methods and release it to the user.

Further, encryption processing is performed on the digital fingerprint carrier embedded with the digital fingerprint code.

In the embedding process of the digital fingerprint code of the present invention, according to the code length of the digital fingerprint code, part of the video pictures is determined as the fingerprint carrier, which reduces the number of video pictures that need to be embedded in the fingerprint; and the video pictures other than the fingerprint carrier are pre-compressed, encrypted and stored in the video server. Through the method of the invention, the computing load when the server embeds digital fingerprints is reduced, and a unique digital fingerprint code is embedded in each video copy, thereby enhancing the security of copyright protection.

For the method of the present invention, a video copyright protection system is also provided, including a user and a video publisher, wherein,

User, used to initiate a purchase request to the video publisher entity; request a copyright object from the video publisher entity, and decrypt the encrypted video;

The video publisher entity is used to publish video products; encrypt the video, generate a digital fingerprint code database, and embed digital fingerprint codes in some videos as digital fingerprint carriers. It is further used to extract digital fingerprints in pirated videos and track pirates.

Fig. 2 is the composition structure schematic diagram of video publisher entity in the video copyright protection system of the present invention, as shown in Fig. 2, video publisher entity mainly comprises setting unit, selection unit, the first copyright protection unit, the second copyright protection unit and combination unit, where

The setting unit is used to pre-set (generate) an anti-collusion and piracy digital fingerprint code database that meets performance requirements, and the digital fingerprint code has the performance of piracy tracking and collusion piracy tracking.

The selection unit is used to select the digital fingerprint carrier from the original video information, output the original video information except the digital fingerprint carrier to the first copyright protection unit, and output the digital fingerprint carrier to the second copyright protection unit.

The first copyright protection unit uses encryption to protect the original video information except the digital fingerprint carrier, and outputs the first protection information to the combination unit.

The second copyright protection unit, when necessary, uses the digital fingerprint code from the setting unit to perform copyright protection embedded in the digital fingerprint code on the digital fingerprint carrier, and outputs the second protection information to the combination unit. The second copyright protection unit is further configured to encrypt the digital fingerprint carrier embedded with the digital fingerprint code.

The combination unit combines the video information protected by different copyright protection methods, and releases the protected video information to the user.

The video publisher entity also includes a tracking unit, which is used to extract the digital fingerprint code in the fingerprint carrier of the pirated video, and track the pirate user according to the binding record of the user information and the digital fingerprint code.

The method of the present invention will be described in detail below in conjunction with the examples.

Fig. 3 is the flow chart of the embodiment that the video publisher carries out copyright protection to the video file of the present invention, as shown in Fig. 3, comprises:

Step 300: Select part of the video information from the original video picture as a digital fingerprint carrier.

The issuer selects the number of digital fingerprint carriers according to the length of the fingerprint code, for example:

即选择所有视频图片中的3张作为数字指纹载体。The fingerprint code length is 1000, the video compression picture is cif (320×288), and the block size of the picture compression is 16×16, so each picture has a total of $\frac{320\&times;288}{16\&times;16}=360$ blocks. If a digital 1-bit fingerprint code is embedded in each block, the number of digital fingerprint carriers required is

That is, select 3 of all video pictures as digital fingerprint carriers.

Step 3011: The video publisher compresses, encodes and encrypts the video pictures except the digital fingerprint carrier and stores them on the server side. Also take the cif format as an example:

The number of blocks in each picture is 360, then a 0-1 sequence with a length of 360 is generated as an encryption key {s ₁ ,...,s ₃₆₀ }, which is used as a global key, that is, each video file, Each frame of video picture adopts the encryption key;

若s_i＝0，则Y_i保持不变；Encryption is implemented in the encoding process, and a mild encryption method is used, that is, the DC component of the "intra-frame" video (I-frame) luminance signal (Y) is recoverable "destroyed" according to the key sequence, the specific method is : DCT transformation is performed on the Y signal of the i-th block in each frame of pictures, i={1,...,360}. For its DC component DY _i , if s _i =1, then

If s _i =0, then Y _i remains unchanged;

Steps 3021 to 3023: After the user requests the video publisher to purchase a product, the video publisher assigns a digital fingerprint code to the user from the pre-generated database of anti-collusion piracy digital fingerprint codes that meet performance requirements; embeds digital fingerprint codes into the digital fingerprint carrier. Fingerprint code and encrypt it. Among them, the selected digital fingerprint code has the performance of piracy tracking and collusion piracy tracking.

Step 303: Combining the digital fingerprint carrier with other parts and releasing it to the user.

Fig. 4 is a schematic diagram of an embodiment of video digital fingerprint embedding and encryption according to the present invention. In this embodiment, it is assumed that the digital fingerprint selected by the video publisher to be assigned to the user in the digital fingerprint database is {b ₁ ,..., b ₁₀₀₀ }, where the code length of the fingerprint code is 1000, and the digital fingerprint code is embedded into the digital fingerprint carrier during the encoding process. Here, only 1 bit digital fingerprint code is embedded in each block, and the digital fingerprint code contained in the digital fingerprint carrier needs to be embedded There are 1000 blocks of digital fingerprints {B ₁ ,..., B ₁₀₀₀ }; for the DCT transform coefficients of each block, in this embodiment, the first value AC[0] of the AC component of the DCT transform coefficients is used as Embed position. For the DCT transformation coefficients of each block, according to the human visual system, some coefficients that are not sensitive to the visual system are selected as the embedding positions of the fingerprint bits. In order not to conflict with the encryption process, the selected coefficients should exclude the DC component.

For each bit b _i in the digital fingerprint code, i is 1, 2, 3...N, if b _i > 0 and the coefficient selected in the block B _i that needs to be embedded in the digital fingerprint contained in the digital fingerprint carrier is negative, Invert the corresponding coefficient; if b _i >0 and the coefficient selected in the block B _i contained in the digital fingerprint carrier that needs to embed the digital fingerprint is 0, then assign the corresponding coefficient to 1; if b _i <0 and the number If the coefficient selected in the block B _i that needs to _embed the digital fingerprint contained in the fingerprint carrier is positive, then _the coefficient is reversed; If the coefficient is 0, then assign the value -1. This operation ensures that the sign of the corresponding coefficient in _Bi is consistent with the value of _Bi . The specific process is shown in Figure 4, including:

Step 400: Determine whether _bi is equal to 1, if _bi = 1, go to step 4011; otherwise go to step 4021.

Step 4011: Determine whether AC _i [0] in B _i is less than 0, if AC _i [0]<0, go to step 4012; otherwise go to step 4013.

Step 4012: AC _i [0] is negated and assigned to AC _i [0], that is, AC _i [0]←-AC _i [0], and enters step 403 .

Step 4013: Determine whether AC _i [0] in B _i is equal to 0, if AC _i [0]=0, go to step 4014; otherwise go to step 403.

Step 4014: The value of AC _i [0] is 1, and then enter step 403 .

Step 4021: Determine whether AC _i [0] in B _i is greater than 0, if AC _i [0]>0, go to step 4022; otherwise go to step 4023.

Step 4022: AC _i [0] is inverted and assigned to AC _i [0], that is, AC _i [0]←-AC _i [0], enter step 403 .

Step 4023: Judging whether AC _i [0] in B _i is equal to 0, if AC _i [0]=0, go to step 4024; otherwise go to step 403.

Step 4024: The value of AC _i [0] is -1, and then enter step 403 .

Step 403: Enter step 404 after i is incremented by 1.

Step 404: Judging whether i is greater than N, if so, proceed to step 405; otherwise, return to step 400.

Step 405: Use the method in step 3011 to encrypt the digital fingerprint carrier embedded with the digital fingerprint code.

Fig. 5 is a flowchart of an embodiment of the present invention in which a user purchases a video from a publisher, requests a copyright object, and decrypts the video, as shown in Fig. 5 ,

Step 500: When the user requests to purchase video information, the video publisher confirms the user information.

Step 501: Judging whether the confirmation of user information is passed, if passed, go to step 502, otherwise go to step 507.

Step 502: The video publisher assigns a digital fingerprint code to the user and saves it in the sales record.

Step 503: Embedding the assigned digital fingerprint code in the digital fingerprint carrier, combining the digital fingerprint carrier embedded with the digital fingerprint code with other parts of the requested video information, and releasing it to the user.

Step 504: The user requests a copyright object containing the video decryption key {s ₁ , . . . , s _M } from the video publisher, and the video publisher confirms the user information.

Step 505: Judging whether the confirmation of user information is passed, if passed, go to step 506, otherwise go to step 507.

Step 506: The video publisher sends the copyright object to the user through an encrypted channel, and the user receives the copyright object and decrypts the video. Taking the cif format as an example, during the video decoding process, the user terminal also pays attention to the luminance signal of each block of the I-frame picture, and decrypts its DCT DC component. The specific method: the i-th block DC component DY in each frame of picture _i , if s _i =1, then DY _i ←DY _i ×2, if s _i =0, then Y _i remains unchanged.

Step 507: End this process.

As shown in Figure 5, the transaction process between the user and the video publisher of the present invention, the user requests the video publisher to purchase a product and provides relevant personal information, and after obtaining the protected video file, the user also needs to request the copyright from the publisher subject to watch the video. The video distribution process in the present invention can seamlessly access the existing DRM standard.

Fig. 6 is the flow chart of the embodiment that the video issuer of the present invention carries out piracy tracking to the pirated video, as shown in Fig. 6, including:

Step 600: The video publisher detects pirated video products on the network.

In the process of piracy tracking, existing technologies such as file detection and data mining in the network can be combined to actively mine pirated video copies from Internet data, and then track the pirates.

Step 601 - Step 602: The video publisher extracts the digital fingerprint carrier in the pirated video, and extracts the digital fingerprint code from the obtained digital fingerprint carrier.

Decode the digital fingerprint carrier part, pay attention to the DCT coefficients of the I-frame block during the decoding process, and the block to be concerned is {B ₁ ,...,B ₁₀₀₀ }. According to the embedding process, the extraction method of the digital fingerprint code in this step is: for each block B _i , if AC _i [0]>0, then the corresponding digital fingerprint code bit b _i =1; if AC _i [0] <0, then the corresponding digital fingerprint code bit is b _i =0.

Step 603: According to the traceability of the digital fingerprint code and the corresponding relationship between the user and the digital fingerprint code, the pirated copy user or the colluding pirated user can be traced.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the 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.

Images