Digital copyright protection method for printing

Abstract

The invention discloses a digital copyright protection method for printing, which comprises the following steps of: embedding copyright information data into a digital file of a printed matter by using a mixed digital watermarking algorithm to obtain an embedded digital file; performing first encryption processing on the embedded digital file by using a symmetric encryption algorithm to obtain a first encrypted digital file; performing second encryption processing on the embedded digital file by using an asymmetric encryption algorithm to obtain a second encrypted digital file; adjusting printing parameters of printing equipment according to the printing content and the second encrypted digital file through a printing parameter adjusting model; the block chain technology is introduced to carry out identity authentication and authorization management on the printing equipment, and the printing equipment is used for printing, so that copyright information can be hidden in a digital file of a printed matter and is difficult to illegally obtain and tamper. The hybrid digital watermarking algorithm combines various forms of watermarks such as images, texts, audios and the like, so that the complexity and uniqueness of copyright information are increased.

Description

Technical Field

[0001] The invention relates to the technical field of digital printing, in particular to a digital copyright protection method for printing. Background Art

[0002] Traditional printing processes have also become more vulnerable under the impact of the digital wave. A large number of digital files flow between different devices and systems. From the design stage to printing production, and then to distribution and sales, there is a risk of copyright infringement in every link. For example, in the design stage, digital files may be illegally stolen or tampered with; in the printing production process, unauthorized printing equipment may be used to copy printed materials; and in the distribution and sales stage, digital printed materials may be illegally downloaded and disseminated. Traditional copyright protection methods seem to be powerless in dealing with these new challenges. For example, simple copyright logos and statements are often easily overlooked or forged, and cannot really play a role in protecting copyright. Although some cryptography-based protection methods have improved security to a certain extent, they also have the risk of being cracked. At the same time, traditional copyright protection methods are usually isolated and lack deep integration with the entire printing industry chain, making it difficult to achieve comprehensive and effective copyright protection. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to design a digital copyright protection method for printing.

[0004] To achieve the above object, the technical solution of the present invention is that, further, in the above-mentioned digital copyright protection method for printing, the digital copyright protection method comprises the following steps:

[0005] Using a hybrid digital watermark algorithm, the copyright information data is embedded into the digital file of the printed matter to obtain an embedded digital file;

[0006] Performing a first encryption process on the embedded digital file using a symmetric encryption algorithm to obtain a first encrypted digital file;

[0007] Performing a second encryption process on the embedded digital file using an asymmetric encryption algorithm to obtain a second encrypted digital file;

[0008] By means of a printing parameter adjustment model, the printing parameters of the printing device are adjusted according to the printing content and the second encrypted digital file;

[0009] Blockchain technology is introduced to authenticate and authorize printing equipment, and the printing equipment is used for printing to obtain the target printed digital files.

[0010] Furthermore, in the above-mentioned digital copyright protection method for printing, the hybrid digital watermark algorithm is used to embed the copyright information data into the digital file of the printed matter to obtain the embedded digital file, including:

[0011] Acquire copyright information content, wherein the copyright information content at least includes the name of the copyright owner, the copyright registration number, and the creation date;

[0012] Acquire a copyright information image, resize and grayscale the copyright information image in sequence to obtain an original digital image,

[0013] Based on the DWT discrete wavelet transform algorithm, the original digital image is subjected to a multi-level discrete wavelet transform, the low-frequency sub-band is used as the embedding area, and the original digital image is embedded into the low-frequency sub-band coefficient to obtain a watermarked digital image;

[0014] Based on the character encoding algorithm, a specific text area of ​​the watermark digital image is selected, the specific text area is converted into a binary code, and the binary code is embedded into the character code of the text to obtain an embedded digital file.

[0015] Furthermore, in the above-mentioned digital copyright protection method for printing, the embedded digital file is encrypted for the first time using a symmetric encryption algorithm to obtain a first encrypted digital file, including:

[0016] The symmetric encryption algorithm is the AES advanced symmetric encryption algorithm, and the key length is 128 bits;

[0017] Acquire an embedded digital file, and divide the embedded digital file into data blocks of fixed sizes to obtain a block digital file;

[0018] For each data block in the block digital file, the AES advanced symmetric encryption algorithm and the key are used to encrypt the data, and the encryption process includes byte replacement, row shift, column confusion and round key addition to obtain an encrypted digital file;

[0019] The encrypted digital files are reassembled to obtain a first encrypted digital file.

[0020] Furthermore, in the above-mentioned digital copyright protection method for printing, the embedded digital file is encrypted for a second time using an asymmetric encryption algorithm to obtain a second encrypted digital file, including:

[0021] The asymmetric encryption algorithm is an RSA algorithm, which generates a pair of public and private keys;

[0022] A first encrypted digital file is obtained, the first encrypted digital file is divided into data blocks of appropriate size, and each data block is encrypted using a public key to obtain a second encrypted digital file.

[0023] Furthermore, in the above-mentioned digital copyright protection method for printing, the printing parameters of the printing device are adjusted according to the printing content and the second encrypted digital file by using the printing parameter adjustment model, including:

[0024] A CNN convolutional neural network is set as a printing parameter adjustment model, and the parameter adjustment model is pre-trained using historical printing parameters in a database;

[0025] Obtain a second encrypted digital file, and input the second encrypted digital file into a trained printing parameter adjustment model,

[0026] According to the characteristics of the printed content, target printing parameters are predicted, and the target printing parameters at least include ink concentration, printing resolution, and color balance.

[0027] Furthermore, in the above-mentioned digital copyright protection method for printing, the blockchain technology is introduced to authenticate and authorize the printing device, and the printing device is used for printing to obtain the target printed digital file, including:

[0028] A blockchain network for authentication and authorization management of printing equipment is constructed using a private chain, in which a unique digital identity is created for the printing equipment and registered on the blockchain;

[0029] When the printing device is connected to the network, identity authentication is performed, and the device sends the digital identity and authentication information to the blockchain network;

[0030] The nodes in the blockchain network verify the authentication information of the device. The verification process includes checking the digital signature of the device and verifying the device's certificate.

[0031] If the authentication is successful, the device is authorized to connect to the network and print using the printing device to obtain the target printed digital file.

[0032] Furthermore, a system for a digital copyright protection method for printing is implemented, characterized in that the system includes the following modules:

[0033] A file embedding module, used to embed copyright information data into a digital file of a printed product using a hybrid digital watermark algorithm to obtain an embedded digital file;

[0034] A first encryption module, used to perform a first encryption process on the embedded digital file using a symmetric encryption algorithm to obtain a first encrypted digital file;

[0035] A second encryption module, used to perform a second encryption process on the embedded digital file using an asymmetric encryption algorithm to obtain a second encrypted digital file;

[0036] A parameter adjustment module, used for adjusting the printing parameters of the printing device according to the printing content and the second encrypted digital file through a printing parameter adjustment model;

[0037] The device management module is used to introduce blockchain technology to authenticate and authorize the printing equipment, use the printing equipment to print, and obtain the target printed digital file.

[0038] Furthermore, a system for a digital copyright protection method for printing is implemented, characterized in that the system includes the following modules:

[0039] An acquisition submodule, used to acquire copyright information content, wherein the copyright information content at least includes the name of the copyright owner, the copyright registration number, and the creation date;

[0040] The adjustment submodule is used to obtain the copyright information image, adjust the size and grayscale the copyright information image in sequence to obtain the original digital image.

[0041] A transform submodule is used to perform a multi-level discrete wavelet transform on the original digital image based on a DWT discrete wavelet transform algorithm, taking a low-frequency subband as an embedding area, embedding the original digital image into a low-frequency subband coefficient, and obtaining a watermarked digital image;

[0042] The conversion submodule is used to select a specific text area of ​​the watermark digital image based on a character encoding algorithm, convert the specific text area into a binary code, and embed the binary code into the character code of the text to obtain an embedded digital file.

[0043] Furthermore, a system for a digital copyright protection method for printing is implemented, characterized in that the system includes the following modules:

[0044] A determination submodule is used to determine that the symmetric encryption algorithm is an AES advanced symmetric encryption algorithm, and the key length is 128 bits;

[0045] A block submodule is used to obtain an embedded digital file, divide the embedded digital file into data blocks of fixed sizes, and obtain a block digital file;

[0046] The encryption submodule is used to encrypt each data block in the block digital file using the AES advanced symmetric encryption algorithm and the key, wherein the encryption process includes byte replacement, row shift, column confusion and round key addition to obtain an encrypted digital file;

[0047] The combining submodule is used to reassemble the encrypted digital files to obtain a first encrypted digital file.

[0048] The beneficial effect is that, by using a hybrid digital watermark algorithm, the copyright information data is embedded into the digital file of the printed product to obtain an embedded digital file; the embedded digital file is encrypted for the first time by using a symmetric encryption algorithm to obtain a first encrypted digital file; the embedded digital file is encrypted for the second time by using an asymmetric encryption algorithm to obtain a second encrypted digital file; the printing parameters of the printing device are adjusted according to the printed content and the second encrypted digital file by using a printing parameter adjustment model; the blockchain technology is introduced to authenticate and authorize the printing device, and the printing device is used for printing to obtain a target printed digital file. The copyright information can be hidden in the digital file of the printed product, making it difficult to be illegally obtained and tampered with. The hybrid digital watermark algorithm combines watermarks in various forms such as images, texts and audios, increasing the complexity and uniqueness of the copyright information. At the same time, the double insurance of symmetric encryption and asymmetric encryption improves the security of the file. In the printing process, the application of intelligent control and blockchain technology increases the difficulty of illegal copying. The artificial intelligence algorithm automatically adjusts the printing parameters according to different printed contents, so that each printed product has unique physical characteristics and is difficult to be copied. Blockchain technology performs identity authentication and authorization management on printing equipment, ensuring that only legitimate equipment can perform printing operations, effectively preventing the occurrence of illegal printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0050] Figure 1 It is a schematic diagram of a first embodiment of a digital copyright protection method for printing in an embodiment of the present invention;

[0051] Figure 2 A schematic diagram of a second embodiment of a digital copyright protection method for printing in an embodiment of the present invention;

[0052] Figure 3 FIG. 3 is a schematic diagram of a third embodiment of a digital copyright protection method for printing in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1 As shown, a digital copyright protection method for printing includes the following steps:

[0056] Step 101: using a hybrid digital watermark algorithm, embed the copyright information data into the digital file of the printed matter to obtain an embedded digital file;

[0057] Specifically, in this embodiment, copyright information content is obtained, and the copyright information content includes at least the name of the copyright owner, the copyright registration number, and the creation date; a copyright information image is obtained, and the copyright information image is resized and grayed in turn to obtain an original digital image, and a multi-level discrete wavelet transform is performed on the original digital image based on a DWT discrete wavelet transform algorithm, and a low-frequency sub-band is used as an embedding area, and the original digital image is embedded into the low-frequency sub-band coefficients to obtain a watermarked digital image; based on a character encoding algorithm, a specific text area of ​​the watermarked digital image is selected, the specific text area is converted into a binary code, and the binary code is embedded into the character code of the text to obtain an embedded digital file.

[0058] Step 102: Perform a first encryption process on the embedded digital file using a symmetric encryption algorithm to obtain a first encrypted digital file;

[0059] Specifically, the symmetric encryption algorithm in this embodiment is the AES advanced symmetric encryption algorithm, and the key length is 128 bits; the embedded digital file is obtained, and the embedded digital file is divided into data blocks of a fixed size to obtain a block digital file; for each data block in the block digital file, the AES advanced symmetric encryption algorithm and the key are used to encrypt, and the encryption process includes byte replacement, row shift, column confusion and round key addition to obtain an encrypted digital file; the encrypted digital file is recombined to obtain a first encrypted digital file.

[0060] Specifically, determine the content of copyright information: First, clarify the copyright information to be embedded, including key information such as the name of the copyright owner, copyright registration number, creation date, etc. Digitize this information for subsequent embedding operations.

[0061] Select a hybrid digital watermarking algorithm: Image watermarking part: Use an algorithm based on discrete wavelet transform (DWT). Perform multi-level discrete wavelet transform on the original digital image and use the low-frequency subband as the embedding area. Preprocess the copyright information image, such as resizing, graying, etc., and then embed it into the low-frequency subband coefficients according to specific rules. For example, the low-frequency coefficients can be slightly modified according to a certain intensity factor to make it carry the characteristics of the copyright information image. After embedding, perform an inverse discrete wavelet transform to obtain a digital image with an image watermark.

[0062] Text watermark part: Use an algorithm based on character encoding. Select a specific text area in the digital file, such as the header, footer or specific paragraph mark of the document. Convert the copyright information text into binary code, and then embed these codes into the character code of the text according to certain rules. For example, the copyright information can be embedded by modifying the least significant bit of the ASCII code of the character. During the embedding process, ensure that the readability and normal display of the text are not affected.

[0063] Audio watermarking: Use an algorithm based on frequency domain transformation. Perform Fast Fourier Transform (FFT) on the audio signal to convert the copyright information audio signal into the frequency domain. Select a suitable frequency band in the specific frequency region of the audio for embedding. The copyright information can be embedded by adjusting the amplitude or phase of the frequency band. After embedding, perform inverse Fast Fourier Transform to obtain a digital audio file with an audio watermark.

[0064] Integrate the embedding results: Integrate the images, texts and audio files with different forms of watermarks to ensure their coordination and consistency in the digital files. At the same time, perform quality inspection on the integrated digital files to ensure that the embedding of watermarks will not have a significant impact on the quality of the printed products.

[0065] Step 103, encrypt the embedded digital file for a second time using an asymmetric encryption algorithm to obtain a second encrypted digital file;

[0066] Specifically, the asymmetric encryption algorithm in this embodiment is the RSA algorithm, which uses the RSA algorithm to generate a pair of public keys and private keys; obtain a first encrypted digital file, divide the first encrypted digital file into data blocks of appropriate sizes, and use the public key to encrypt each data block to obtain a second encrypted digital file.

[0067] Step 104, adjusting the printing parameters of the printing device according to the printing content and the second encrypted digital file through the printing parameter adjustment model;

[0068] Specifically, in this embodiment, a CNN convolutional neural network is set as a printing parameter adjustment model, and the parameter adjustment model is pre-trained using historical printing parameters in a database; a second encrypted digital file is obtained, and the second encrypted digital file is input into the trained printing parameter adjustment model, and the target printing parameters are predicted according to the characteristics of the printed content. The target printing parameters include at least ink concentration, print resolution, and color balance.

[0069] Specifically, data collection and preprocessing: collect a large number of different types of printed content samples and corresponding printing parameter data. These samples can include various printed materials such as books, magazines, posters, etc. Feature extraction of printed content, such as color distribution, texture characteristics, image complexity, etc. At the same time, quantify printing parameters such as ink concentration, print resolution, paper type, etc. Preprocess the data, including data cleaning, normalization and other operations, so that the machine learning algorithm can better process the data. Select a machine learning algorithm: You can use a deep learning algorithm, such as a convolutional neural network (CNN) or a recurrent neural network (RNN).

[0070] Training model: Take the preprocessed printing content features and printing parameters as input data and the desired printing effect as output label to train the machine learning model. By continuously adjusting the model parameters, the model can accurately predict the optimal printing parameters required for different printing contents.

[0071] Adjust printing parameters: When there is a new printing task, the printing content represented by the second encrypted digital file is input into the trained machine learning model. The model predicts the best printing parameters, such as ink concentration, printing resolution, color balance, etc., based on the characteristics of the printing content. According to the prediction results of the model, the parameters of the printing equipment are automatically adjusted to obtain the target printing digital file.

[0072] Step 105: Introduce blockchain technology to authenticate and authorize the printing device, use the printing device to print, and obtain the target printed digital file.

[0073] Specifically, in this embodiment, a private chain is used to build a blockchain network for printing device authentication and authorization management. In the blockchain network, a unique digital identity is created for the printing device and registered on the blockchain. When the printing device is connected to the network, identity authentication is performed, and the device sends the digital identity and authentication information to the blockchain network. The nodes in the blockchain network verify the device's authentication information, and the verification process includes checking the device's digital signature and verifying the device's certificate. If the authentication passes, the device is authorized to connect to the network, and the printing device is used for printing to obtain the target printed digital file.

[0074] Specifically, establish a blockchain network: build a blockchain network dedicated to the authentication and authorization management of printing equipment. It can be in the form of a public chain, a private chain or a consortium chain, depending on actual needs. In the blockchain network, create a unique digital identity for each legal printing device and register it on the blockchain.

[0075] Identity authentication: When a printing device is connected to the network, identity authentication is performed. The device sends its digital identity and related authentication information to the blockchain network. The nodes in the blockchain network verify the authentication information of the device. The verification process can include checking the digital signature of the device, verifying the device's certificate, etc. If the authentication is passed, the device is authorized to connect to the network and can receive printing tasks.

[0076] Authorization management: Copyright owners can manage the authorization of printing equipment through the blockchain network. Authorization can be one-time or long-term, depending on the needs of the copyright owner. When the copyright owner needs to authorize a printing device to perform a specific printing task, they can publish an authorization transaction on the blockchain. The transaction contains the digital identity of the printing device, the details of the printing task, and the authorization period. After receiving the authorization transaction, the printing device can verify the legitimacy of the transaction and perform the printing task within the authorization period.

[0077] Printing process: The printing device that has been authenticated and authorized receives the target digital file. The device prints the digital file according to the adjusted printing parameters. During the printing process, the status of the device and the printing quality can be monitored in real time to ensure the smooth completion of the printing task.

[0078] Recording and tracing: The nodes in the blockchain network will record the detailed information of each printing task, including the digital identity of the printing equipment, printing time, printing content, etc. These records can be used to trace the source and copyright information of the printed matter to ensure the legality and traceability of the copyright. At the same time, it can also provide evidence for the copyright owner to protect his rights in the event of a copyright dispute.

[0079] The beneficial effect is that, by using a hybrid digital watermark algorithm, the copyright information data is embedded into the digital file of the printed product to obtain an embedded digital file; the embedded digital file is encrypted for the first time using a symmetric encryption algorithm to obtain a first encrypted digital file; the embedded digital file is encrypted for the second time using an asymmetric encryption algorithm to obtain a second encrypted digital file; the printing parameters of the printing device are adjusted according to the printed content and the second encrypted digital file through a printing parameter adjustment model; the blockchain technology is introduced to authenticate and authorize the printing device, and the printing device is used for printing to obtain a target printed digital file. The copyright information can be hidden in the digital file of the printed product, making it difficult to be illegally obtained and tampered with. The hybrid digital watermark algorithm combines watermarks in various forms such as images, texts and audio, increasing the complexity and uniqueness of the copyright information. At the same time, the double insurance of symmetric encryption and asymmetric encryption improves the security of the file. In the printing process, the application of intelligent control and blockchain technology increases the difficulty of illegal copying. The artificial intelligence algorithm automatically adjusts the printing parameters according to different printed contents, so that each printed product has unique physical characteristics and is difficult to be copied. Blockchain technology performs identity authentication and authorization management on printing equipment, ensuring that only legitimate equipment can perform printing operations, effectively preventing the occurrence of illegal printing.

[0080] See also Figure 2 In a digital copyright protection method for printing, a hybrid digital watermark algorithm is used to embed copyright information data into a digital file of a printed product, and obtaining the embedded digital file includes the following steps:

[0081] Step 201, obtaining copyright information content, the copyright information content at least includes the name of the copyright owner, copyright registration number, and creation date;

[0082] Step 202: Obtain a copyright information image, resize and grayscale the copyright information image in sequence to obtain an original digital image.

[0083] Step 203: Perform multi-level discrete wavelet transform on the original digital image based on the DWT discrete wavelet transform algorithm, use the low-frequency sub-band as the embedding area, embed the original digital image into the low-frequency sub-band coefficients, and obtain a watermarked digital image;

[0084] Step 204: Based on the character encoding algorithm, select a specific text area of ​​the watermark digital image, convert the specific text area into a binary code, embed the binary code into the character code of the text, and obtain an embedded digital file.

[0085] See also Figure 3In a digital copyright protection method for printing, blockchain technology is introduced to authenticate and authorize the printing device, and the printing device is used for printing to obtain the target printed digital file, including the following steps:

[0086] Step 301: Use a private chain to build a blockchain network for printing device authentication and authorization management. In the blockchain network, create a unique digital identity for the printing device and register it on the blockchain.

[0087] Step 302: When the printing device is connected to the network, identity authentication is performed, and the device sends the digital identity and authentication information to the blockchain network;

[0088] Step 303: The nodes in the blockchain network verify the authentication information of the device. The verification process includes checking the digital signature of the device and verifying the certificate of the device.

[0089] Step 304: If the authentication is successful, the device is authorized to connect to the network and print using the printing device to obtain the target printed digital file.

[0090] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A digital copyright protection method for printing, characterized in that: The digital copyright protection method comprises the following steps: Using a hybrid digital watermark algorithm, the copyright information data is embedded into the digital file of the printed matter to obtain an embedded digital file; Performing a first encryption process on the embedded digital file using a symmetric encryption algorithm to obtain a first encrypted digital file; Performing a second encryption process on the embedded digital file using an asymmetric encryption algorithm to obtain a second encrypted digital file; By means of a printing parameter adjustment model, the printing parameters of the printing device are adjusted according to the printing content and the second encrypted digital file; Blockchain technology is introduced to authenticate and authorize printing equipment, and the printing equipment is used for printing to obtain the target printed digital files.

2. A digital copyright protection method for printing as claimed in claim 1, characterized in that: The hybrid digital watermark algorithm is used to embed copyright information data into the digital file of the printed matter, and the embedded digital file is obtained, including: Acquire copyright information content, wherein the copyright information content at least includes the name of the copyright owner, the copyright registration number, and the creation date; Acquire a copyright information image, resize and grayscale the copyright information image in sequence to obtain an original digital image, Based on the DWT discrete wavelet transform algorithm, the original digital image is subjected to a multi-level discrete wavelet transform, the low-frequency sub-band is used as the embedding area, and the original digital image is embedded into the low-frequency sub-band coefficient to obtain a watermarked digital image; Based on the character encoding algorithm, a specific text area of ​​the watermark digital image is selected, the specific text area is converted into a binary code, and the binary code is embedded into the character code of the text to obtain an embedded digital file.

3. A digital copyright protection method for printing as claimed in claim 1, characterized in that: The embedded digital file is encrypted for the first time using a symmetric encryption algorithm to obtain a first encrypted digital file, including: The symmetric encryption algorithm is the AES advanced symmetric encryption algorithm, and the key length is 128 bits; Acquire an embedded digital file, and divide the embedded digital file into data blocks of fixed sizes to obtain a block digital file; For each data block in the block digital file, the AES advanced symmetric encryption algorithm and the key are used to encrypt the data, and the encryption process includes byte replacement, row shift, column confusion and round key addition to obtain an encrypted digital file; The encrypted digital files are reassembled to obtain a first encrypted digital file.

4. A digital copyright protection method for printing as claimed in claim 1, characterized in that: The embedded digital file is encrypted for a second time using an asymmetric encryption algorithm to obtain a second encrypted digital file, including: The asymmetric encryption algorithm is an RSA algorithm, which generates a pair of public and private keys; A first encrypted digital file is obtained, the first encrypted digital file is divided into data blocks of appropriate size, and each data block is encrypted using a public key to obtain a second encrypted digital file.

5. A digital copyright protection method for printing as claimed in claim 1, characterized in that: The printing parameter adjustment model adjusts the printing parameters of the printing device according to the printing content and the second encrypted digital file, including: A CNN convolutional neural network is set as a printing parameter adjustment model, and the parameter adjustment model is pre-trained using historical printing parameters in a database; Acquire a second encrypted digital file, and input the second encrypted digital file into a trained printing parameter adjustment model; According to the characteristics of the printed content, target printing parameters are predicted, and the target printing parameters at least include ink concentration, printing resolution, and color balance.

6. A digital copyright protection method for printing as claimed in claim 1, characterized in that: The blockchain technology is introduced to authenticate and authorize the printing device, and the printing device is used for printing to obtain the target printed digital file, including: A blockchain network for authentication and authorization management of printing devices is constructed using a private chain, in which a unique digital identity is created for the printing device and registered on the blockchain; When the printing device is connected to the network, identity authentication is performed, and the device sends the digital identity and authentication information to the blockchain network; The nodes in the blockchain network verify the authentication information of the device. The verification process includes checking the digital signature of the device and verifying the device's certificate. If the authentication is successful, the device is authorized to connect to the network and print using the printing device to obtain the target printed digital file.

7. A system for implementing a digital copyright protection method for printing as claimed in claim 1, characterized in that: The system includes the following modules: A file embedding module, used to embed copyright information data into a digital file of a printed product using a hybrid digital watermark algorithm to obtain an embedded digital file; A first encryption module, used to perform a first encryption process on the embedded digital file using a symmetric encryption algorithm to obtain a first encrypted digital file; A second encryption module, used to perform a second encryption process on the embedded digital file using an asymmetric encryption algorithm to obtain a second encrypted digital file; A parameter adjustment module, used for adjusting the printing parameters of the printing device according to the printing content and the second encrypted digital file through a printing parameter adjustment model; The device management module is used to introduce blockchain technology to authenticate and authorize the printing equipment, use the printing equipment to print, and obtain the target printed digital file.

8. A system for implementing a digital copyright protection method for printing as claimed in claim 1, characterized in that: The system includes the following submodules: An acquisition submodule, used to acquire copyright information content, wherein the copyright information content at least includes the name of the copyright owner, the copyright registration number, and the creation date; The adjustment submodule is used to obtain the copyright information image, adjust the size and grayscale the copyright information image in sequence to obtain the original digital image. A transform submodule is used to perform a multi-level discrete wavelet transform on the original digital image based on a DWT discrete wavelet transform algorithm, taking a low-frequency subband as an embedding area, embedding the original digital image into a low-frequency subband coefficient, and obtaining a watermarked digital image; The conversion submodule is used to select a specific text area of ​​the watermark digital image based on a character encoding algorithm, convert the specific text area into a binary code, and embed the binary code into the character code of the text to obtain an embedded digital file.

9. A system for implementing a digital copyright protection method for printing as claimed in claim 1, characterized in that: The system includes the following submodules: A determination submodule is used to determine that the symmetric encryption algorithm is an AES advanced symmetric encryption algorithm, and the key length is 128 bits; A block submodule is used to obtain an embedded digital file, divide the embedded digital file into data blocks of fixed sizes, and obtain a block digital file; The encryption submodule is used to encrypt each data block in the block digital file using the AES advanced symmetric encryption algorithm and the key, wherein the encryption process includes byte replacement, row shift, column confusion and round key addition to obtain an encrypted digital file; The combining submodule is used to reassemble the encrypted digital files to obtain a first encrypted digital file.

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