CN102547254A - Method and system for digital video image copyright protection based on watermarks and encryption - Google Patents

Abstract

The present invention provides a digital video image copyright protection method and system based on watermarking and encryption. The method provides a strategy for digital video image copyright protection. The method includes: step 1, the sending end is used for original or compressed video The image is embedded with a visible and erasable watermark; and/or step 2, the sending end performs key-level parameter positioning and selective encryption processing on the compressed video image; step 3, the receiving end decrypts and erases the watermark according to the authorization, and restores the digital video image image; the visible erasable watermark has visibility, robustness and erasability. Step 2 further includes: the sending end selects part of the key data at the level according to the encoding type; the sending end selects all or part of the key data at the level to encrypt and describe it in the digital rights management description information; the receiving end obtains all or part of the key data at the level according to the authorization Decryption rights to obtain high-quality full video images or partial video images.

Description

A digital video image copyright protection method and system based on watermark and encryption

technical field

The invention proposes a digital video image content copyright scalable protection technology method based on watermark and encryption processing, and specifically relates to a digital video image copyright protection method and system based on watermark and encryption.

Background technique

The dissemination of digital audio and video content With the popularization of digital broadcasting and broadband networks, the dissemination of digital audio and video content and related rights management have become increasingly important issues for content service providers, consumers, and even government regulators. To solve this problem, research and development of digital rights management technology (Digital Rights Management, DRM). DRM technology is a system framework rather than a simple single technology, it is composed of various related technologies in a specific way. It is used to protect the rights of producers, publishers and consumers of digital works as they flow from producers to publishers to consumers and from consumers to other consumers.

Aiming at the development needs of the modern digital audio and video content operation industry, facing the development needs of digital audio and video content services and terminals, and taking into account the needs of consumers, the present invention proposes a scalable digital rights management (Scalable DRM) implementation method for digital video image copyright protection And the corresponding visible erasable watermark and hierarchical encryption authorization processing method.

The prior art does not consider "DRM for scalable protection" in the digital video image copyright protection method, so the defect brought is: either because there is no authorization, all contents cannot be viewed, or all authorizations can be viewed. However, in actual demand, existing service providers sometimes wish to give users graded and scalable authorization in the process of content operation: for example, unauthorized users can watch part of the video image of the abstract with a watermark prompt to attract consumers to pay to buy and watch Copyright, user terminals with primary functions only need to purchase partial authorization to watch the whole process of primary-quality video images, and user terminals with advanced functions can purchase full authorization to obtain a complete high-quality viewing experience. Therefore, the prior art cannot solve the above-mentioned technical problems.

The part of "scalable protection DRM" borrows the concept of "scalable" in video coding. Terminal selections of bandwidth and different processing capabilities are presented. Similarly, the "scalable" goal in scalable DRM technology refers to the one-time security watermarking and encryption protection processing of digital audio and video content, which can be suitable for terminals with different capabilities, different consumption needs and various transmission/storage environments. Level authorized use.

Encryption processing in digital rights management in the prior art refers to protecting all or part of the data of pictures or videos, so that only authorized user terminals can decrypt and watch the corresponding whole or part of the content.

However, the digital watermark in the prior art is an identifiable digital signal or pattern embedded in the streaming media host data, and does not affect the availability of the host data, and can be effectively used for property rights protection of streaming media information. Digital watermarking is a hot spot in digital rights management technology in recent years. Digital watermarking cannot prevent the dissemination of content, but it can restrain irresponsible dissemination behaviors through copyright information reminders or dissemination tracking with the help of copyright protection laws. Most of the existing video image watermarks used in digital rights management technology are hidden and invisible, which is suitable for the original copyright owner to track copyright use or prove copyright ownership information. In reality, content operators are usually not the original copyright owner, but they hope to pass the visible watermark Remind unauthorized users to pay to be authorized to watch the full content without watermark prompt interference. The existing visible watermark technology research mainly focuses on the original uncompressed or decompressed and restored video image processing, but in reality, most of the contents of content operators are compressed and encoded digital video image contents. Therefore, the existing watermarking technical means cannot meet the needs of the market.

In addition, the prior art does not apply the combination of visible watermark and scalable encryption in the field of digital video image copyright protection. Considering the needs of content operation, it is hoped that unauthorized or partially authorized users can watch the whole process of excerpts or low-quality content to attract users to buy more authorizations for a complete appreciation experience. The technical scheme of the present invention provides a specific technical strategy of scalable copyright protection for such content operation requirements.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the watermark and encryption technology in the field of digital video image copyright protection, thereby proposing a method for scalable protection of digital video image content copyright protection, that is, the present invention provides a watermark-based A copyright protection method and system for encrypted digital video images.

In order to achieve the above object, the present invention provides a digital video image copyright protection method based on watermarking and encryption, the method provides a sending end for digital video image copyright protection to encrypt and/or watermark embedding, and the specific steps are as follows:

The sender performs encryption and/or watermark embedding, the specific steps are as follows:

Step 1, the sender performs visible erasable watermark embedding processing on the original video image or the compressed video image.

In step 2, the sending end performs different levels of key data location and selective encryption processing on the compressed video image.

The receiving end decrypts and/or erases the watermark, and the specific steps are as follows:

If the sending end chooses the encryption step after embedding the watermark, the receiving end obtains the decryption authority of all or part of the above-mentioned key data according to the authorization, restores all or part of the hierarchical data, and then the receiving end obtains the watermark embedded by the sending end according to the watermark removal authorization Information to remove the watermark, so as to obtain high-quality full video image or partial quality video image viewing experience.

Wherein, the visible and erasable watermark has visibility, robustness and erasability.

In the above technical solution, the step 2 further includes the following steps:

Step 1. The sender selects key data at different levels according to the coding type positioning.

Step 2, the sender chooses to encrypt all or part of the above-mentioned hierarchical data and describe it in the digital rights management description information.

Optionally, when MPEG series or Chinese AVS series video coding standards are adopted, the hierarchical key data includes: image parameter set, video sequence parameter set and key image frame, that is, frame header data and frame body data at the I frame level.

In the above technical solution, said step 1 further includes the following steps:

The step for modulating the watermark: modulate the black and white watermark picture to be embedded through a preset random sequence; the step for watermark embedding: combine the black and white watermark picture modulated by the random sequence with the brightness of the video image frame to be embedded with the watermark The components are divided into blocks of the same size and discrete cosine transform; then the discrete cosine transform coefficients of the watermark image are superimposed on the discrete cosine transform coefficients of the corresponding video image; finally, subsequent quantization and encoding are performed according to the video image coding standard to complete the watermark embedding.

Described step 3 further comprises the following steps:

The receiving end is authorized to obtain the original watermark and its random modulation sequence information and/or the key information used for encrypting the hierarchical key data of the video image frame.

The obtained key information is used to decrypt the key data information of the video image frame. The obtained original watermark picture and random modulation sequence are used to remove the copyright or payment prompt watermark of the digital video image, and the operation is reversed to the watermark embedding process, that is, the original watermark picture is randomly modulated, block discrete cosine transform and from the content The discrete cosine transform block coefficient corresponding to the watermark is subtracted from the discrete cosine transform block coefficient of the watermarked video image frame to completely remove the watermark and restore the original video image.

Based on the above method, the present invention also provides a digital video image copyright protection system based on watermarking and encryption. The system provides a scalable protection strategy for digital video image copyright protection, and satisfies content operators for different user terminals. Authorized business push, the system includes:

The watermark embedding module located at the sending end is used for performing visible and erasable watermark embedding processing on original video images or compressed video images.

An encryption module located at the sending end, which is used for locating key data at different levels and selectively encrypting compressed video images.

The decryption and watermark removal module at the receiving end is used to judge that if the sending end chooses to encrypt after embedding the watermark, it will obtain the decryption authority of all or part of the above-mentioned key data according to the authorization, restore all or part of the hierarchical data, and then Obtain the watermark information embedded in the sending end according to the watermark removal authorization to remove the watermark, so as to obtain high-quality full video image or partial quality video image viewing experience.

Wherein, the visible and erasable watermark has visibility, robustness and erasability.

In the above technical solution, the encryption module further includes: a key data selection sub-module, which is used to select key data of different levels according to the location of the encoding type; description in the information.

Optionally, when MPEG series or Chinese AVS series video coding standards are adopted, the hierarchical key data includes: image parameter set, video sequence parameter set and key image frame, that is, frame header data and frame body data at the I frame level.

In the above technical solution, the watermark embedding module further includes:

The modulation submodule is used to modulate the black and white watermark picture to be embedded through a preset random sequence; and the watermark embedding processing submodule is used to combine the black and white watermark picture modulated by the random sequence with the video image frame to be embedded with watermark The luminance component is divided into blocks of the same size and discrete cosine transform; then the discrete cosine transform coefficients of the watermark image are superimposed on the discrete cosine transform coefficients of the corresponding video image; finally, the subsequent quantization coding is performed according to the video image coding standard to complete the watermark embedding.

The decryption and dewatering module further includes:

A sub-module for obtaining related information, which is authorized to obtain the original watermark and its random modulation sequence information and/or the key information used for encrypting the hierarchical key data of the video image frame.

The decryption sub-module is used to use the obtained key information to decrypt the key data information of the video image frame. and

The watermark erasing sub-module is used to use the obtained original watermark picture and random modulation sequence to remove the copyright or payment prompt watermark of the digital video image, and perform the opposite operation to the watermark embedding process, that is, perform random modulation on the original watermark picture, The block discrete cosine transform and the discrete cosine transform block coefficients corresponding to the watermark are subtracted from the discrete cosine transform block coefficients of the watermarked video image frame to completely remove the watermark and restore the original video image.

The advantage of the present invention is that: when copyright protection technology processing is required, the content provider or service provider can perform scalable adjustment on the data range and level of watermark processing and encryption protection. You can choose to use only visible and erasable watermark processing, or you can combine content encryption for further protection after watermark processing. For promotional ordinary quality sample content, only watermark processing can be done without content encryption processing, any user can watch the video image content with visible watermark prompts (such as continuous interference watermark pictures reminding purchase authorization), attracting interested users to buy Authorize to remove watermark to watch clear video images. For high-value and high-quality content, after embedding a visible and erasable watermark, some key data at the above-mentioned location can be selected for encryption processing. Users can only watch complete and clear pictures or high-quality videos after obtaining the double authorization of decrypting the encrypted data area and erasing the watermark. Only select part of the hierarchical key data encryption processing, which is convenient for simplifying the hierarchical positioning and decryption recovery processing of video images during terminal decoding, and saves processing time. It is especially beneficial for receiving terminals with limited software processing capabilities to decrypt and decode high-bit-rate video image content.

Description of drawings

Fig. 1 is the schematic flow sheet of the digital video image copyright protection method based on watermark and encryption of the present invention;

Fig. 2 is the flowchart of the visible erasable watermark processing method of the present invention;

Fig. 3 is a flow chart of the hierarchical decomposition and selective encryption protection processing method of the present invention;

FIG. 4 is a diagram of a compressed video hybrid coding model referred to in the description process of an embodiment of the present invention;

Fig. 5 is the realization flowchart of watermark embedding of the embodiment of the present invention;

FIG. 6 is a flow chart of implementing a dedicated watermark decoder according to an embodiment of the present invention;

Fig. 7 is a flow chart of random regulation and control of embedding strength in the process of embedding and eliminating the visible erasable video watermark according to the embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Aiming at the demands of digital video image content service and terminal development, and taking into account the needs of consumers, the present invention proposes hierarchical encryption authorization and visible erasable watermark processing methods to realize digital content copyright protection (Scalable DRM) for scalable rights protection. The present invention proposes a scalable protection method for copyright protection of digital video image content, and performs visible erasable watermark processing and hierarchical decomposition and selective encryption protection processing of image or video data for popular digital video image encoding formats. In order to realize one-time watermarking and encryption processing on the same digital video image content, it can be suitable for different levels and granularity of license authorization for terminals with different capabilities, different consumption needs and various terminal security environments, and achieve digital content protection. Degrees of protection and ratings are "scalable" for purposes. The invention aims at the development needs of digital video image content services and terminals, taking into account the needs of consumers, and proposes hierarchical encryption authorization and visible erasable watermark processing methods to realize digital content copyright protection (Scalable DRM) for scalable rights protection.

In the process of recommending and providing services for digital video image content, there has always been a contradiction between copyright protection and the convenience for consumers to understand and use the purchased content services. Content providers hope to strictly protect digital content, and still strictly encrypt and protect it when it enters the hands of consumers. , and consumers expect to have the opportunity to have a free trial or to obtain fully decrypted digital content after purchase for free viewing and use.

The purpose of the present invention is to provide content providers or operators with visible and erasable watermarks and encryption processing technology methods, so that the degree of content protection can be flexibly adjusted, so that content providers or operators can encourage the protection degree and convenience of digital content copyright technology processing. Adjustment between consumer trial and purchase use is referred to by the present invention as scalable digital rights protection.

Main points of the inventive method: Aiming at the popular digital video image coding format, perform hierarchical decomposition, and perform visible erasable watermark and encryption protection processing based on the hierarchical decomposition, so as to realize one-time watermark and encryption processing on the same digital video image content, that is It can be suitable for different levels and granularity of license authorization for terminals with different processing capabilities and different consumption needs, so as to achieve the purpose of "scalable" digital content protection scope and level.

The invention includes a hierarchical decomposition method of digitally compressed video images, a visible erasable watermark and an encryption processing method. Hierarchical decomposition includes: system key data positioning such as image parameter set Picture_Parameter Set and video sequence parameter set Sequence_Parameter Set, key frame or key strip (such as I_frame or I_slice) positioning and image frame or strip level key data (such as frame_header or slice_header and frame body data) positioning and other steps. Watermark processing includes the process of watermark embedding and authorized erasure. After the watermark image is modulated by a secretly set random sequence, the watermark embedding after modulation is selected in the DCT transform coefficient of the video image frame. The watermark image is the same as the video image frame that needs to be embedded with the watermark. The size of the block (such as 8x8 or 4x4), DCT transformation, and then the transformation coefficient is superimposed on the DCT transformation coefficient of the corresponding image frame, and then subsequent operations such as quantization and encoding are performed. During normal decoding, since the original watermark picture and the random modulation sequence used are unknown, the watermark cannot be completely erased. The user terminal decoder that supports this watermark method can completely eliminate the watermark by obtaining the original picture and random modulation sequence authorized by the digital rights management system. Get clear playback images or videos. The encryption process includes selecting all or part of the key data encryption of the above-mentioned levels and describing them in the copyright management description information. The copyright protection function achieved by the above watermark processing process is different from the copyright protection function achieved by the existing covert watermark technology. The visible watermark processing process of the present invention reminds the viewer of copyright or payment information through explicit visible information to interfere with the viewing experience of unauthorized users. , the authorized user decoding end can remove the interference watermark information used for copyright or payment reminder, and get a complete and high-quality appreciation experience. The visible watermark processing of the present invention is also different from the existing visible image watermark processing. The existing visible image watermark embedding processing needs to embed watermark picture information on the original unencoded or decoded video image data. The visible watermark processing of the present invention can The watermark is embedded in the compressed coded video image, and the watermark information can be embedded without decoding and restoring the original video image. Since most of the content obtained by the video image content operator is in a compressed encoding format, the watermark processing method of the present invention expands the scope of video images applicable to watermark processing, and can save watermark embedding processing by exempting the process of decoding and restoring video images for compressed encoded images time.

As shown in Fig. 1, this figure is a schematic flow chart of the digital video image copyright protection method based on watermark and encryption of the present invention. The method specifically includes the following steps:

Step 101, the sending end performs visible and erasable watermark embedding processing on the original video image or the compressed video image; and/or

In step 102, the sending end performs different levels of key data location and selective encryption processing on the compressed video image.

Step 103, if the sending end chooses the encryption step after embedding the watermark, the receiving end obtains the decryption authority of all or part of the above-mentioned hierarchical key data according to the authorization, restores all or part of the hierarchical data, and then the receiving end obtains the sending end according to the watermark removal authorization. Embedded watermark information to remove the watermark, so as to obtain high-quality full video image or partial quality video image viewing experience.

Wherein, the visible and erasable watermark has visibility, robustness and erasability.

As shown in Figure 2, this figure is the step process further included in step 101 of the above method and the corresponding flow chart for removing the watermark of the receiver-specific decoder, the method includes:

Step 201, watermark embedding at the sending end, after the watermark image to be embedded is modulated by a preset random sequence, and the watermark embedding after the modulation is selected after the discrete cosine transform DCT of the brightness component of the digital video image is selected, that is, the watermark image and the watermark to be embedded The video image frames are divided into blocks of the same size and subjected to DCT transformation, and then the DCT transformation coefficients are superimposed on the DCT transformation coefficients of the corresponding video image frames, and then the subsequent quantization operation is performed.

Step 202, watermark removal at the receiving end: the decoder at the receiving end obtains the original picture and random modulation sequence through authorization, so as to perform the opposite operation on the decoded video image data to the above watermark embedding process to completely eliminate the watermark, and obtain a clear playback digital video image , the terminal decoder without authorization cannot completely eliminate the watermark because it cannot obtain the original watermark picture and modulation sequence.

As shown in Figure 3, this figure is a flow chart of steps further included in step 102 of the above method and a corresponding decryption process at the receiving end, the method includes:

In step 301, the sending end selects and locates key data of different levels according to the encoding type.

In step 302, the sender chooses to encrypt all or part of the key data at the above-mentioned levels and gives a description in the copyright management description information.

In step 303, the receiving end obtains the decryption key of all or part of the hierarchical key data through the digital rights management system, so as to watch the complete high-quality video image or part of the high-quality video image (such as low resolution or low frame rate).

Example

The above-mentioned patent method is applicable to various versions of MPEG series compressed video. The description of this embodiment takes MPEG-4AVC (i.e. H.264) as an example. Using the above method to compress images or video content in other formats also falls within the scope of the patent claims. The implementation process includes data hierarchical positioning and extraction, visible and erasable watermarks processing and optional selective encryption processing or a combination of watermarking and encryption processing, watermarking and encryption processing can be used alone or in combination. When used in combination, the watermark should be processed first and then encrypted, and the receiving end should first decrypt according to the encryption authorization, and then erase the watermark when decoding and displaying according to the watermark blanking authorization.

When digital content copyright protection technology processing is required, the content provider or service provider can make scalable adjustments in the data range and level of watermark processing and encryption protection. You can choose to use visible and erasable watermark processing alone, or combine content encryption for further protection after watermark processing. For example, when promoting display content, only watermark processing can be done without encryption processing, any user can watch video image content with visible watermark prompts (such as continuous interference watermark stripes or purchase authorization reminder information), attracting interest Users purchase authorization to eliminate watermarks to watch clear video images; for high-value and high-quality content, after embedding visible and erasable watermarks, key data of different levels can be selected (such as image parameters, sequence parameters and I-SLICE header information) Or select the fine-level data encryption processing of the scalable coding content or encrypt the entire data of the video image. Users can only watch complete and clear pictures or videos after obtaining the double authorization of encrypted data area decryption and watermark erasure, otherwise they can only watch partial clips or low-quality effects. Part of the hierarchical key data encryption process is selected to simplify the hierarchical positioning and decryption recovery processing of video image data during terminal decoding. It is especially beneficial for receiving terminals with limited software processing capabilities to decrypt and decode high-bit-rate video content, and at the same time, it can control unauthorized users. Watching the content summary entice the user to purchase the full license.

Visible erasable watermark processing method based on AVC/H.264

Visible watermarks need to have the following characteristics: visibility, robustness (not easy to be removed by transformation), and erasability. The video is composed of many consecutive image frames. When the visible watermark is embedded in the continuous video image frame, its embedding position should be fixed to reduce the jumping of the watermark and obtain a stable and visible effect; while the carrier of the watermark can be seen in the static image Just a single image, the watermark can be placed anywhere on a single image.

Combined with the framework of the mainstream hybrid coding standard, such as the H.264/AVC standard, it can be seen that the optional positions where the watermark can be embedded are shown in Figure 4 as A to F.

The specific embodiment of the present invention chooses to perform watermark embedding at B after DCT transformation, and the adopted block diagram 5 is as follows. The watermark image and the video image frame are divided into blocks of the same size and DCT transformed, and then the transform coefficients are superimposed on the DCT transform coefficients of the image, and then subsequent quantization and other operations are performed.

Suppose the watermark image to be embedded is W ₁ (embedded in the Intra frame I of the video). After the embedding operation of the watermark, the encoded and output information is watermarked information I ₁ =I+W ₁ . The information reconstructed by the decoder is I', which also includes watermark information. Both intra-frame motion compensation and inter-frame motion compensation use the reconstructed I' (including watermark information) as a reference for motion compensation.

After obtaining the Watermark of the original watermarked picture through authorization, it can be decoded using the dedicated erasable watermark decoder shown in Figure 6 below. The dedicated decoder performs the watermark removal operation after inverse quantization (before inverse transformation), and the decoded information I ' and P' are used in the subsequent decoding process, and the watermark-removed information I _R and _PR are displayed after loop filtering to realize watermark blanking, so that clear video images without watermark can be viewed.

If there is no authorization and the watermark embedded in the image cannot be obtained, it is equivalent to using a normal general-purpose decoder to decode and display the video with a visible watermark prompt image or text information, as shown in I' and P' in Figure 6.

Taking a black and white watermark image as an example, the embedding and erasing process is as follows:

Using the black and white original watermark image, first perform block operation of the same size as the video image (such as 4x4 or 8x8), use the random number seed set secretly to generate a random number sequence to modulate the pixel value of the watermark image to control the embedding strength of the visible watermark, and then Carry out DCT transformation, and perform addition operation with the DCT coefficients of the video image to be embedded. At the decoding end, the same block division operation is performed first, and the user random number seed generates a random number sequence to modulate the value of each pixel of the watermark image, then performs DCT transformation and then subtracts the DCT coefficients to erase the visible watermark. The embedding and removal process of the visible erasable watermark algorithm used in the embodiment example of the present invention is shown in FIG. 7 .

In summary, the present invention proposes a scalable protection method for copyright protection of digital video image content, and performs visible erasable watermark processing and hierarchical decomposition and selection of image or video data for popular digital video image encoding formats One-time watermarking and/or encryption processing for the same digital video image content, which is suitable for different levels and granularity of license authorization for terminals with different capabilities, different consumption needs and various terminal security environments , to achieve the purpose of "scalable" digital content protection scope, protection degree and level. The invention aims at the development needs of digital video image content services and terminals, taking into account the needs of consumers, and proposes hierarchical encryption authorization and visible erasable watermark processing methods to realize scalable digital rights management (Scalable DRM).

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (10)

1. A digital video image copyright protection method based on watermarking and encryption, the method provides a scalable protection strategy for digital video image copyright protection, and satisfies content operators’ business pushes with different levels of authorization for different user terminals. Said method comprises the steps: The sender performs encryption and/or watermark embedding, the specific steps are as follows: Step 1, the sending end performs visible and erasable watermark embedding processing on the original video image or the compressed video image; Step 2, the sending end performs different levels of key data positioning and selective encryption processing on the compressed video image; The receiving end decrypts and/or erases the watermark, and the specific steps are as follows: If the sending end chooses the encryption step after embedding the watermark, the receiving end obtains the decryption authority of all or part of the above-mentioned key data according to the authorization, restores all or part of the hierarchical data, and then the receiving end obtains the watermark embedded by the sending end according to the watermark removal authorization Information to remove the watermark, so as to obtain high-quality full video image or partial quality video image viewing experience; Wherein, the visible and erasable watermark has visibility, robustness and erasability. 2. the digital video image copyright protection method based on watermark and encryption according to claim 1, is characterized in that, described step 2 further comprises the steps: Step 1, the sender selects key data at different levels according to the encoding type positioning; Step 2, the sender chooses to encrypt all or part of the above-mentioned hierarchical data and describe it in the digital rights management description information. 3. the digital video image copyright protection method based on watermark and encryption according to claim 2, is characterized in that, when adopting MPEG series or Chinese AVS series video coding standard, described hierarchical key data comprises: image parameter set, video The sequence parameter set and the key image frame are frame header data and frame body data at the I-frame level. 4. the digital video image copyright protection method based on watermark and encryption according to claim 1, is characterized in that, described step 1 further comprises the steps: The step for modulating the watermark: modulate the black and white watermark picture to be embedded through a preset random sequence; the step for watermark embedding: combine the black and white watermark picture modulated by the random sequence with the brightness of the video image frame to be embedded with the watermark The components are divided into blocks of the same size and discrete cosine transform; then the discrete cosine transform coefficients of the watermark image are superimposed on the discrete cosine transform coefficients of the corresponding video image; finally, subsequent quantization and encoding are performed according to the video image coding standard to complete the watermark embedding. 5. the digital video image copyright protection method based on watermark and encryption according to claim 1, is characterized in that, described step 3 further comprises the steps: The receiving end is authorized to obtain the original watermark and its random modulation sequence information and/or the key information used for the encryption of the hierarchical key data of the video image frame; Using the obtained key information to decrypt the key data information of the video image frame; The obtained original watermark picture and random modulation sequence are used to remove the copyright or payment prompt watermark of the digital video image, and the operation is reversed to the watermark embedding process, that is, the original watermark picture is randomly modulated, block discrete cosine transform and from the content The discrete cosine transform block coefficient corresponding to the watermark is subtracted from the discrete cosine transform block coefficient of the watermarked video image frame to completely remove the watermark and restore the original video image. 6. A digital video image copyright protection system based on watermarking and encryption. The system provides a scalable protection strategy for digital video image copyright protection, and satisfies content operators’ business pushes with different levels of authorization for different user terminals. The system includes: A watermark embedding module located at the sending end, which is used to perform visible and erasable watermark embedding processing on original video images or compressed video images; An encryption module located at the sending end, which is used to locate key data at different levels and selectively encrypt the compressed video images; and Decryption and release watermark module, which is used to judge if the sender chooses to encrypt after embedding the watermark, obtain the decryption authority of all or part of the above-mentioned key data according to the authorization, restore all or part of the layer data, and then remove it according to the authorization Watermark authorization to obtain the watermark information embedded in the sender to remove the watermark, so as to obtain high-quality full video image or partial quality video image viewing experience; Wherein, the visible and erasable watermark has visibility, robustness and erasability. 7. the digital video image copyright protection system based on watermark and encryption according to claim 6, is characterized in that, encryption module further comprises: The key data selection sub-module is used to select key data at different levels according to the coding type positioning; and The encryption processing sub-module is used to select all or part of the above layer data encryption and describe it in the digital rights management description information. 8. the digital video image copyright protection system based on watermark and encryption according to claim 7, is characterized in that, when adopting MPEG series or Chinese AVS series video coding standard, described hierarchical key data comprises: image parameter set, video The sequence parameter set and the key image frame are frame header data and frame body data at the I-frame level. 9. the digital video image copyright protection system based on watermark and encryption according to claim 6, is characterized in that, described watermark embedding module further comprises: The modulation submodule is used to modulate the black and white watermark image to be embedded through a preset random sequence; and The watermark embedding processing sub-module is used to divide the black-and-white watermark picture modulated by the random sequence and the luminance component of the video image frame to be embedded with the watermark into blocks of the same size and perform discrete cosine transform; then superimpose the discrete cosine transform coefficients of the watermark picture into the discrete cosine transform coefficient of the corresponding video image; finally, the subsequent quantization and encoding is performed according to the video image encoding standard to complete the watermark embedding. 10. the digital video image protection system based on watermark and encryption according to claim 6, is characterized in that, described deciphering and removing watermark module further comprise: A sub-module for obtaining authorization-related information, which is authorized to obtain the original watermark and its random modulation sequence information and/or the key information used for the encryption of the hierarchical key data of the video image frame; The decryption submodule is used to use the obtained key information to decrypt the key data information of the video image frame; and The erasing watermark sub-module is used to use the obtained original watermark picture and random modulation sequence to remove the copyright or payment prompt watermark of the digital video image, and perform the opposite operation to the watermark embedding process, that is, perform random modulation on the original watermark picture, The block discrete cosine transform and the discrete cosine transform block coefficients corresponding to the watermark are subtracted from the discrete cosine transform block coefficients of the watermarked video image frame to completely remove the watermark and restore the original video image.

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