CN104657629A - Document copyright protection method and device - Google Patents

Abstract

The invention discloses a file copyright protection method and equipment. In the present invention, for the server-side device: perform fragmentation out-of-sequence processing on the original file, and record the position of each fragment file in the original file in the out-of-order file after processing; generate a fragment order file, and store the fragment order file Insert it into the out-of-sequence file according to a preset algorithm, and add the size of the fragment sequence file to the out-of-order file; and send the out-of-order file to the terminal side device. For the terminal side device: receive the out-of-order file sent by the server-side device; obtain the corresponding fragment order file from the out-of-order file according to the preset algorithm and the size of the fragment order file carried in the out-of-order file; The out-of-sequence files are restored to the original files, which improves the security of the files.

Description

A file copyright protection method and device

technical field

The invention relates to the technical field of communications, in particular to a file copyright protection method and device.

Background technique

At present, the content that needs digital copyright protection mainly adopts DRM (Digital Right Management, digital rights management) solution. DRM is also called "content digital copyright encryption protection technology", which is the most widely used content copyright protection technology at present. It is mainly aimed at copyright protection during the use of files, combating piracy, and protecting the legitimate rights and interests of copyright owners.

In the existing DRM solution, there are the following disadvantages:

1. The DRM solution is more complicated, and a more complicated DRM system needs to be deployed on the server side and the terminal side;

2. The DRM encryption scheme is aimed at encrypting the entire file, which has a greater efficiency problem in a system with high concurrency.

Contents of the invention

The invention provides a file copyright protection method and equipment for improving file security.

In order to achieve the above purpose, the embodiment of the present invention provides a file copyright protection method, including:

The server-side device performs fragmentation out-of-sequence processing on the original file, and records the position of each fragment file in the original file in the processed out-of-order file;

The server-side device generates a fragment sequence file, which includes the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the disorder file; wherein, in the disorder file Each fragment file has the same size;

The server-side device inserts the fragment sequence file into the out-of-order file according to a preset algorithm, and adds the size of the fragment sequence file in the out-of-order file;

The server-side device sends the out-of-sequence file to the terminal-side device.

The embodiment of the present invention also provides a file copyright protection method, including:

The terminal-side device receives the out-of-sequence files sent by the server-side device;

The terminal side device acquires the corresponding fragment sequence file from the disorder file according to a preset algorithm and the size of the fragment sequence file carried in the disorder file, and the sequence fragment file includes the sequence fragment file The position of each fragmented file in the original file, the size of the original file, and the size of the fragmented file; wherein, the size of each fragmented file in the disordered file is the same;

The terminal-side device restores the out-of-sequence file to an original file according to the fragment sequence file.

The embodiment of the present invention also provides a server-side device, including:

The first processing module is used to perform fragmentation out-of-sequence processing on the original file;

A recording module, configured to record the position of each fragmented file in the original file in the processed out-of-sequence file;

A generating module, configured to generate a fragment sequence file, the fragment sequence file including the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the disordered file; wherein, in the disordered file Each fragment file has the same size;

The second processing module is used to insert the fragment sequence file into the out-of-order file according to a preset algorithm, and add the size of the fragment sequence file in the out-of-order file;

A sending module, configured to send the corresponding out-of-sequence file to the terminal-side device.

The embodiment of the present invention also provides a terminal side device, including:

The receiving module is used to receive the out-of-sequence files sent by the server-side device;

An acquisition module, configured to acquire a corresponding fragment sequence file from the disorder file according to a preset algorithm and the size of the fragment sequence file carried in the disorder file, the sequence fragment file including the disorder file The position of each fragmented file in the original file, the size of the original file, and the size of the fragmented file; wherein, the size of each fragmented file in the disordered file is the same;

A processing module restores the out-of-sequence file to the original file according to the fragment sequence file.

In the foregoing embodiments of the present invention, for the server-side device: perform fragmentation out-of-sequence processing on the original file, and record the position of each fragment file in the original file in the out-of-order file; generate a fragment order file, and store the fragment order file according to The preset algorithm is inserted into the out-of-sequence file, and the size of the fragment sequence file is added to the out-of-order file; and the out-of-order file is sent to the terminal side device. For the terminal side device: receive the out-of-order file sent by the server-side device; obtain the corresponding fragment order file from the out-of-order file according to the preset algorithm and the size of the fragment order file carried in the out-of-order file; The out-of-sequence files are restored to the original files, and the implementation of the solution is simpler and the security is higher.

Description of drawings

Fig. 1 is a schematic flow chart of a file copyright protection method provided by an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of another file copyright protection method provided by an embodiment of the present invention;

FIG. 3 is a schematic flow diagram of another file copyright protection method provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of another file copyright protection method provided by an embodiment of the present invention;

Fig. 5a is a schematic diagram of processing an original file into an out-of-sequence file by a server-side device provided by an embodiment of the present invention;

FIG. 5b is a schematic diagram of restoring an out-of-sequence file to an original file by a terminal-side device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a server-side device provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a terminal-side device provided by an embodiment of the present invention.

Detailed ways

Aiming at the above-mentioned problems in the prior art, the embodiment of the present invention provides a technical solution for file copyright protection. In this technical solution, for the server-side device: perform fragmentation out-of-sequence processing on the original file, and record the position of each fragment file in the original file in the processed out-of-order file; generate a fragment order file, and store the fragment order The file is inserted into the out-of-sequence file according to a preset algorithm, and the size of the fragment sequence file is added to the out-of-order file; the out-of-order file is sent to the terminal side device. For the terminal side device: receive the out-of-order file sent by the server-side device; obtain the corresponding fragment order file from the out-of-order file according to the preset algorithm and the size of the fragment order file carried in the out-of-order file; The out-of-sequence files are restored to the original files.

Wherein, in the embodiment of the present invention, the fragment sequence file may include the position of each fragment file in the original file in the out-of-order file, the size of the original file, and the size of the fragment file; the size of each fragment file in the out-of-order file is the same.

The technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Apparently, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

Embodiment one

This embodiment is the processing flow of the technical solution for file copyright protection provided by the embodiment of the present invention on the side of the server-end device.

As shown in FIG. 1, it is a schematic flowchart of a file copyright protection method provided by an embodiment of the present invention, which may include the following steps:

Step 101, the server-side device performs fragmentation out-of-sequence processing on the original file, and records the position of each fragment file in the original file in the out-of-order file after processing.

Specifically, considering that a file is composed of a series of ordered binary bit streams, and each file format has its own specific file format and structure, in the embodiment of the present invention, the server-side device can perform fragmentation on the original file. The way of sequential processing is to divide the original file into a group of N bytes (N can be set according to the file size and the performance of the server-side device, such as 2K, 4K, 8K, etc.), and divide it into several groups (each group is a Fragmented files), and the positions of these fragmented files are randomly scrambled, reordered, and the position of each fragmented file in the original file in the processed (ie, fragmented out-of-sequence processing) file is recorded. Wherein, the size of each fragmented file in the out-of-sequence file is the same.

Step 102, the server-side device generates a sequence file of fragments. Wherein, the fragment sequence file includes the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the out-of-order file.

Specifically, in the embodiment of the present invention, after the server-side device performs fragmentation out-of-sequence processing on the original file, fragments can be generated according to the size of the original file, the size of the fragmented files, and the position of each fragmented file in the original file. sequential files.

Wherein, the fragment sequence file may record the position of each fragment file in the original file in a byte sequence.

Assuming that the size of the original file is 100K bytes, when the server-side device fragments the original file, it divides the original file into 25 fragment files in groups of 4K bytes, and divides the fragment files into 25 fragment files. The positions are randomly shuffled and reordered. Then, in the sequence file fragments generated by the server-side device, the position of each fragment file in the out-of-order file in the original file can be recorded in a byte sequence with a length of 25 bytes. For example, assuming that the first byte in the 25-byte byte sequence is "00000111", it indicates that the position of the first fragmented file in the out-of-order file is 7 in the original file (that is, out-of-order file The first fragment file in is the seventh fragment file after the original file is divided into fragments in groups of 4K bytes).

It should be recognized that the above method of recording the position of fragmented files in the original file in the out-of-sequence file through the byte sequence is only a specific implementation of the technical solution provided by the embodiment of the present invention, and is not a limitation of the protection scope of the present invention. Restriction: Based on the embodiment of the present invention, other ways of recording the position of the fragmented files in the original file in the out-of-order file conceived by those skilled in the art without making creative efforts shall fall within the protection scope of the present invention.

Step 103, the server-side device inserts the fragment sequence file into the out-of-order file according to a preset algorithm, and adds the size of the fragment sequence file to the out-of-order file.

Specifically, in the embodiment of the present invention, after performing fragmentation and out-of-order processing on the original file and generating the fragment sequence file, the server-side device can insert the fragment sequence file into the out-of-order file according to a preset algorithm, And add the size of the fragment sequence file in the out-of-sequence file.

Wherein, the preset algorithm may be determined through negotiation between the server-side device and the terminal-side device. For example, the preset algorithm may be to start inserting the fragment sequence file at the 20th byte in the out-of-order file.

Step 104, the server-side device sends the out-of-sequence file to the terminal-side device.

Specifically, after receiving the out-of-sequence file, the terminal-side device can read out the fragment sequence file from the out-of-order file according to an algorithm determined in advance through negotiation, and restore the out-of-order file to the original file according to the fragment sequence file.

Embodiment two

In order to further improve security, in this embodiment, after the server-side device generates the fragment sequence file, it may encrypt the fragment sequence file. Correspondingly, when the server-side device inserts the fragment sequence file into the random sequence file, the encrypted fragment sequence file is inserted.

As shown in FIG. 2, it is a schematic flowchart of another file copyright protection method provided by the embodiment of the present invention, which may include the following steps:

Step 201, the server-side device performs fragmentation out-of-sequence processing on the original file, and records the position of each fragmented file in the original file in the processed out-of-order file.

Step 202, the server-side device generates a sequence file of fragments. Wherein, the fragment sequence file includes the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the out-of-order file.

Step 203: The server-side device encrypts the fragment sequence file, and inserts the encrypted fragment sequence file (also referred to as a certificate file in the embodiment of the present invention) into the random sequence file according to a preset algorithm, and The size of the encrypted fragment sequence file added to the random file.

Specifically, in this embodiment, in order to further improve security, the fragment sequence file can be encrypted, and the encryption key can be pre-negotiated between the network side device and the terminal side device, such as user name, password, or terminal ID and other information.

Wherein, for different terminal-side devices (or users), the encryption keys may be different or the same.

When the encryption keys are different for different terminal-side devices, when the server-side device receives the file download request sent by the terminal-side device, it can determine the corresponding terminal-side device according to the identification information of the terminal-side device carried in the file download request. The encryption key of the device, and use the encryption key corresponding to the terminal-side device to encrypt the fragment sequence file, insert the encrypted fragment sequence file into the random sequence file, and send it to the terminal-side device. For example, the encryption key may be the user name used when the terminal-side device is registered. When the terminal-side device wants to download files, it needs to log in with the user name and password used during registration. After the server-side device receives the file download request sent by the logged-in terminal-side device, it encrypts the fragment sequence file with the user name used for registration of the terminal-side device, and inserts the encrypted fragment sequence file into the disordered file , and send it to the terminal-side device.

In this case, when a file is leaked, the source of the file leak can be determined according to the encryption key used.

When the encryption keys are the same for different terminal-side devices, the server-side device can pre-shuffle the corresponding fragments of the original file, generate a fragment sequence file, encrypt the fragment sequence file, and store the encrypted fragment sequence file inserted into the out-of-order file. When receiving the file download request sent by the terminal-side device, the out-of-sequence file is sent to the terminal-side device.

Step 204, the server-side device sends the out-of-sequence file to the terminal-side device.

Embodiment three

This embodiment is the processing flow of the technical solution for file copyright protection provided by the embodiment of the present invention on the side of the server-end device.

As shown in FIG. 3 , it is a schematic flowchart of a file copyright protection method provided by an embodiment of the present invention, which may include the following steps:

Step 301, the terminal-side device receives the out-of-sequence file delivered by the server-side device.

Specifically, when the terminal-side device wants to download a file, it can send a file download request to the server-side device, and receive the out-of-sequence file sent by the server-side device. For the document processing flow of the server-side device, refer to the processing flow of the server-side device in Embodiment 1 or Embodiment 2.

Step 302, the terminal side device acquires the corresponding fragment sequence file from the disorder file according to the preset algorithm and the size of the fragment sequence file carried in the disorder file. Wherein, the sequence fragment file includes the position of each fragment file in the out-of-order file in the original file, the size of the original file, and the size of the fragment file; the size of each fragment file in the out-of-order file is the same.

Specifically, after the terminal-side device receives the out-of-sequence file sent by the server-side device, it can use the preset algorithm (such as reading the fragment order file from the Kth byte) and the order of fragments carried in the out-of-order file The size of the file gets the corresponding fragment sequence file from the out-of-order file.

Step 303, the terminal side device restores the out-of-sequence file to the original file according to the sequence file of fragments.

Specifically, in this embodiment, after the terminal-side device obtains the fragment sequence file, if the fragment sequence file is an unencrypted file, the terminal device can directly calculate The position of the file in the original file, the original file size, and the fragmented file size will restore the out-of-order file to the original file.

If the fragmented sequence file is an encrypted file, the terminal device needs to decrypt the encrypted fragmented sequence file using the encryption key negotiated with the server device in advance, and then decrypt the random file according to the decrypted fragmented sequence file Revert to the original file.

Embodiment four

Further, in order to verify whether the original file recovered by the terminal-side device is correct, in this embodiment, the fragment sequence file generated by the server-side device may also include the original file MD5 hash value, so that the terminal-side device The hash value verifies the recovered original file.

As shown in FIG. 4 , it is a schematic flowchart of another file copyright protection method provided by the embodiment of the present invention, which may include the following steps:

Step 401, the terminal-side device receives the out-of-sequence file delivered by the server-side device.

Step 402, the terminal side device acquires the corresponding fragment sequence file from the disorder file according to the preset algorithm and the size of the fragment sequence file carried in the disorder file. Wherein, the sequence fragment file includes the position of each fragment file in the out-of-order file in the original file, the size of the original file, the size of the fragment file, and the MD5 hash value of the original file; the size of each fragment file in the out-of-order file is the same.

Step 403, the terminal side device restores the out-of-sequence file to the original file according to the fragment sequence file.

Step 404, the terminal side device verifies the original file according to the MD5 hash value of the original file in the fragment sequence file.

The schematic diagrams of the server-side device processing the original file into an out-of-order file and the terminal-side device restoring the out-of-order file into the original file in the embodiment of the present invention can be shown in Figures 5a and 5b respectively.

It can be seen from the above description that in the technical solution provided by the embodiment of the present invention, for the server-side device: perform fragmentation out-of-sequence processing on the original file, and record the position of each fragmented file in the original file in the out-of-order file; generate Fragment sequence file, and insert the fragment sequence file into the out-of-order file according to a preset algorithm, and add the size of the fragment sequence file in the out-of-order file; send the out-of-order file to the terminal side device. For the terminal side device: receive the out-of-order file sent by the server-side device; obtain the corresponding fragment order file from the out-of-order file according to the preset algorithm and the size of the fragment order file carried in the out-of-order file; The out-of-sequence files are restored to the original files, and the implementation of the solution is simpler and the security is higher.

Based on the same technical concept, the embodiment of the present invention also provides a server-side device, which can be applied to the above method embodiment.

Embodiment five

As shown in FIG. 6, it is a schematic structural diagram of a server-side device provided by an embodiment of the present invention, which may include:

The first processing module 61 is configured to perform fragmentation out-of-sequence processing on the original file;

Recording module 62, for recording the position of each fragment file in the original file in the out-of-sequence file after processing;

Generating module 63, is used for generating the sequence file of fragments, and includes the position in the original file of each fragment file in described out-of-sequence file, original file size, and fragmentation file size in the described fragment order file; Wherein, described out-of-sequence file The size of each fragment file in the file is the same;

The second processing module 64 is configured to insert the fragmented sequence file into the disordered file according to a preset algorithm, and add the size of the fragmented sequence file to the disordered file;

The sending module 65 is configured to send the corresponding out-of-sequence file to the terminal side device.

Wherein, the server end device provided by the embodiment of the present invention also includes:

Also includes:

An encryption module 66, configured to encrypt the fragment sequence file;

The second processing module 64 is specifically configured to insert the encrypted fragment sequence file into the disordered file according to a preset algorithm, and add the encrypted fragment sequence file to the disordered file the size of.

Wherein, for different terminal-side devices, the encryption key used by the server-side device to encrypt the fragment sequence file is the same; or,

For different terminal-side devices, the server-side device uses different encryption keys when encrypting the fragment sequence file.

Wherein, when the encryption keys used by the server-side device for encrypting the fragment sequence file are different for different terminal-side devices, the server-side device provided in the embodiment of the present invention further includes:

The receiving module 67 is configured to receive a file download request sent by the terminal-side device, the file download request carrying identification information of the terminal-side device;

The encryption module 66 is specifically configured to determine an encryption key corresponding to the terminal-side device according to the identification information of the terminal-side device, and use the encryption key to encrypt the fragment sequence file.

Based on the same technical concept, embodiments of the present invention also provide a terminal-side device, which can be applied to the foregoing method embodiments.

Embodiment six

As shown in FIG. 7, it is a schematic structural diagram of a terminal-side device provided by an embodiment of the present invention, which may include:

The receiving module 71 is configured to receive the out-of-sequence files issued by the server-side device;

The acquiring module 72 is configured to acquire a corresponding fragment sequence file from the disorder file according to a preset algorithm and the size of the fragment sequence file carried in the disorder file, and the sequence fragment file includes the disorder The position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the file; wherein, the size of each fragment file in the disordered file is the same;

The processing module 73 restores the out-of-sequence file to the original file according to the fragment sequence file.

Wherein, the fragment sequence file obtained from the out-of-order file is an encrypted fragment sequence file;

The terminal-side device provided by the embodiment of the present invention further includes:

A decryption module 74, configured to decrypt the encrypted fragment sequence file;

The processing module 73 is specifically configured to restore the out-of-sequence file to the original file according to the decrypted fragment sequence file.

Wherein, the fragment sequence file also includes: the original file MD5 hash value;

The processing module 73 is further configured to verify the original file according to the MD5 hash value of the original file in the fragment sequence file.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (14)

1. A file copyright protection method, characterized in that, comprising: The server-side device performs fragmentation out-of-sequence processing on the original file, and records the position of each fragment file in the original file in the processed out-of-order file; The server-side device generates a fragment sequence file, which includes the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the disorder file; wherein, in the disorder file Each fragment file has the same size; The server-side device inserts the fragment sequence file into the out-of-order file according to a preset algorithm, and adds the size of the fragment sequence file in the out-of-order file; The server-side device sends the out-of-sequence file to the terminal-side device. 2. The method according to claim 1, wherein the server-side device further comprises: The server-side device encrypts the fragment sequence file; The server-side device inserts the fragment sequence file into the out-of-order file according to a preset algorithm, and adds the size of the fragment sequence file in the out-of-order file, specifically: The server-end device inserts the encrypted fragment sequence file into the out-of-order file according to a preset algorithm, and adds the size of the encrypted fragment sequence file to the out-of-order file. 3. The method according to claim 2, wherein, for different terminal-side devices, the server-side device uses the same encryption key when encrypting the fragment sequence file; or, For different terminal-side devices, the server-side device uses different encryption keys when encrypting the fragment sequence file. 4. The method according to claim 3, wherein, for different terminal-side devices, the server-side device uses different encryption keys when encrypting the fragment sequence file, Before the server-side device performs fragmentation out-of-sequence processing on the original file, it also includes: The server-side device receives a file download request sent by the terminal-side device, and the file download request carries identification information of the terminal-side device; The server-side device encrypts the fragment sequence file, specifically: The server-side device determines an encryption key corresponding to the terminal-side device according to the identification information of the terminal-side device, and uses the encryption key to encrypt the fragment sequence file. 5. A file copyright protection method, characterized in that, comprising: The terminal-side device receives the out-of-sequence files sent by the server-side device; The terminal side device acquires the corresponding fragment sequence file from the disorder file according to a preset algorithm and the size of the fragment sequence file carried in the disorder file, and the sequence fragment file includes the sequence fragment file The position of each fragmented file in the original file, the size of the original file, and the size of the fragmented file; wherein, the size of each fragmented file in the disordered file is the same; The terminal-side device restores the out-of-sequence file to an original file according to the fragment sequence file. 6. The method according to claim 5, wherein the fragment sequence file obtained from the out-of-order file is an encrypted fragment sequence file; Before the terminal side device restores the out-of-sequence file to the original file according to the fragment sequence file, it further includes: The terminal side device decrypts the encrypted fragment sequence file; The terminal side device restores the out-of-sequence file to the original file according to the fragment sequence file, specifically: The terminal-side device restores the out-of-sequence file to an original file according to the decrypted fragment sequence file. 7. The method according to claim 5, wherein the fragment sequence file also includes: an original file MD5 hash value; After the terminal side device restores the out-of-sequence file to the original file according to the fragment sequence file, it further includes: The terminal-side device verifies the original file according to the MD5 hash value of the original file in the fragment sequence file. 8. A server-side device, characterized in that, comprising: The first processing module is used to perform fragmentation out-of-sequence processing on the original file; A recording module, configured to record the position of each fragmented file in the original file in the processed out-of-sequence file; A generating module, configured to generate a fragment sequence file, the fragment sequence file including the position of each fragment file in the original file, the size of the original file, and the size of the fragment file in the disordered file; wherein, in the disordered file Each fragment file has the same size; The second processing module is used to insert the fragment sequence file into the out-of-order file according to a preset algorithm, and add the size of the fragment sequence file in the out-of-order file; A sending module, configured to send the corresponding out-of-sequence file to the terminal-side device. 9. The server-side device as claimed in claim 8, further comprising: An encryption module, configured to encrypt the fragment sequence file; The second processing module is specifically configured to insert the encrypted fragment sequence file into the out-of-order file according to a preset algorithm, and add the encrypted fragment sequence file to the out-of-order file. size. 10. The server-side device according to claim 9, wherein, for different terminal-side devices, the server-side device uses the same encryption key when encrypting the fragment sequence file; or, For different terminal-side devices, the server-side device uses different encryption keys when encrypting the fragment sequence file. 11. The server-side device according to claim 10, wherein, for different terminal-side devices, when the encryption keys used by the server-side device to encrypt the fragment sequence file are different, the server End devices also include: The receiving module is configured to receive a file download request sent by the terminal-side device, the file download request carrying identification information of the terminal-side device; The encryption module is specifically configured to determine an encryption key corresponding to the terminal-side device according to the identification information of the terminal-side device, and use the encryption key to encrypt the fragment sequence file. 12. A terminal side device, characterized in that it comprises: The receiving module is used to receive the out-of-sequence files sent by the server-side device; An acquisition module, configured to acquire a corresponding fragment sequence file from the disorder file according to a preset algorithm and the size of the fragment sequence file carried in the disorder file, the sequence fragment file including the disorder file The position of each fragmented file in the original file, the size of the original file, and the size of the fragmented file; wherein, the size of each fragmented file in the disordered file is the same; A processing module restores the out-of-sequence file to the original file according to the fragment sequence file. 13. The terminal-side device according to claim 12, wherein the fragment sequence file obtained from the out-of-order file is an encrypted fragment sequence file; The terminal side equipment also includes: A decryption module, configured to decrypt the encrypted fragment sequence file; The processing module is specifically configured to restore the out-of-sequence file to the original file according to the decrypted fragment sequence file. 14. The terminal-side device according to claim 12, wherein the fragment sequence file further comprises: an original file MD5 hash value; The processing module is further configured to verify the original file according to the MD5 hash value of the original file in the fragment sequence file.