WO2017073830A1

WO2017073830A1 - Device, system, and method for 3d printing content protection

Info

Publication number: WO2017073830A1
Application number: PCT/KR2015/012535
Authority: WO
Inventors: 김우경
Original assignee: 히어로컴퍼니 주식회사
Priority date: 2015-10-30
Filing date: 2015-11-20
Publication date: 2017-05-04
Also published as: KR20170050482A

Abstract

The present invention relates to a device, a system, and a method for 3D printing content protection. A control method for a 3D printing system including a client terminal and a printing company control device according to the present invention comprises the steps of: the client terminal encrypting an already provided 3D printing basis file, using a printing public key, to generate an encrypted 3D printing basis file, and transmitting the encrypted 3D printing basis file to the printing company control device; and the printing company control device decrypting the encrypted 3D printing basis file received from the client terminal, using a printing private key corresponding to the printing public key, extracting the 3D printing basis file, and then controlling a 3D printing operation to proceed on the basis of the extracted 3D printing basis file.

Description

Devices, systems, and methods for protecting 3D printed content

The present invention relates to an apparatus, a system, and a method for protecting 3D printed content, and more particularly, when 3D content is transmitted and received between a client requesting 3D printing and a company performing 3D printing, A device, system and method for 3D printing content protection.

Unlike 2D printers that use inks, 3D printers use a variety of materials to stack three-dimensional structures.

With the recent proliferation of 3D printers, various products have been produced using 3D printers.

However, because of the high price of 3D printers, it is more common to ask 3D printing companies to do 3D printing work rather than buy a 3D printer directly.

For example, individuals or companies that want 3D printed outputs can create a data file for 3D printing, that is, a 3D printing basic file directly or by requesting a design developer, and then create the 3D printed basic file. When delivered to a printing company, the 3D printing company delivers the 3D printing basic file received from the client to the equipped 3D printer to output the 3D output.

As described above, the generation of the 3D printing basic file is the most important for generating the 3D output, but there is a problem in that a proper protection means is not provided.

That is, the 3D printing basic file can be generated by a method such as using a 3D modeling program. However, since the creativity of the client or the designer is added to the creation of the 3D printing basic file, proper protection for this is necessary. There is no way to protect this kind of creative content.

For example, a 3D printing foundation file provided by a client to a 3D printing company may be used without permission by a third party to produce and sell 3D output using the 3D printing foundation file regardless of the client's intention.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide an apparatus, a system, and a method for protecting 3D printing content used in 3D printing from unauthorized use by a third party.

In order to achieve the above object, a printing company control apparatus according to the present invention includes a data receiving unit for receiving a 3D printing encryption base file encrypted by using a printing public key; An extraction unit for extracting the 3D printing encryption base file through a decryption process using a printing private key corresponding to the printing public key; And a controller configured to control a 3D printing operation to be performed based on the 3D printing basic file extracted by the extracting unit.

In addition, a control method of a 3D (3-Dimension) printing system comprising a client terminal and a printing company control apparatus according to the present invention to achieve the above object, the client terminal is provided with a 3D printing public key Encrypting a printing base file to generate a 3D printing encryption base file, and transmitting the 3D printing encryption base file to the printing company control device; The printing company control device decrypts the 3D printing encryption base file received from the client terminal using a printing private key corresponding to the printing public key, extracts a 3D printing basic file, and bases the extracted 3D printing basic file on the basis of the extracted 3D printing basic file. And controlling the 3D printing operation to proceed.

In addition, in order to achieve the above object, a control method of a printer control apparatus for communicating with a client terminal according to the present invention includes a 3D printing encryption basic file obtained by encrypting a 3D printing basic file using a printing public key from the client terminal. Receiving; Extracting the 3D printing basic file by decrypting the 3D printing encryption basic file using a printing private key corresponding to the printing public key, and controlling a 3D printing operation to proceed based on the extracted 3D printing basic file. It is done by

1 is a schematic block diagram of an entire 3D printing system including a printing company control device according to an embodiment of the present invention,

2 is a functional block diagram of the printing company control device of FIG.

3 is a control flowchart of the entire 3D printing system including a printing company control device according to an embodiment of the present invention,

4 is a control flowchart related to 3D printing content protection of a printing company control device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, each embodiment according to the present invention is only one example to help understanding of the present invention, and the present invention is not limited to these embodiments. In particular, the present invention may be composed of a combination of at least one or more of individual configurations, individual functions, or individual steps included in each embodiment.

In addition, each signal referred to in each embodiment according to the present invention may refer to one signal transmitted by one connection or the like, but may also mean a series of signal groups transmitted for the purpose of performing a specific function described below. . That is, in each embodiment, a plurality of signals transmitted at predetermined time intervals or transmitted after receiving a response signal from the counterpart device may be represented by one signal name for convenience.

A schematic configuration of a 3D (3-Dimension) printing system including a printing company control device 100 according to an embodiment of the present invention is shown in FIG. 1.

First, the encryption key management server 300 performs a function of generating and managing a printing private key and a printing public key paired with the printing private key. Here, the printing private key is an encryption key used to encrypt the 3D printing base file for 3D printing, and the printing private key is an encryption key used to decrypt the encrypted 3D printing base file.

That is, the encryption key management server 300 generates a printing private key and a printing public key using an asymmetric key encryption algorithm, and may use a known method such as an RSA encryption algorithm for asymmetric key encryption.

The printing public key is an encryption key that anyone can access, and the printing private key is an encryption key that can be used only by a specific device, but the present invention is not limited thereto.

In particular, when there is a request for generating an encryption key from the client terminal 200, the encryption key management server 300 may generate a printing public key and a printing private key specific to the client or the client terminal 200. Here, the printing public key and the printing private key may be one-time encryption keys generated and used for one-time use.

That is, the printing public key and the printing private key generated by the encryption key management server 300 may be deleted so as not to be used again once issued.

The encryption key management server 300 provides the generated printing public key to the client terminal 200, and provides the printing private key to the printing company control device 100.

In particular, the encryption key management server 300 may perform the authentication process based on the information received from the printing company control device 100, and then transmit the printing private key to the printing company control device 100 only when authentication is successful. have.

For example, when the encryption key management server 300 requests a printing private key using a general computer, the encryption key management server 300 rejects the request and provides the printing private key only when there is a request from a dedicated device for controlling the 3D printer 101. You can do it.

As another example, even if the printing company control device 100 is a general computer, the encryption key management server 300 may be a computer that has been verified and authenticated such that external leakage or duplication of an internally generated file is impossible when 3D printing is operated. In this case, a printing private key can be provided.

The encryption key management server 300 may be managed by a company that produces and sells the 3D printer 101, for example.

The client terminal 200 is operated by a person requesting 3D printing and may correspond to, for example, a computer.

Here, the client may be an individual or a design company employee. The client generates a file required for 3D printing, that is, a 3D printing basic file, and requests the 3D output from the printing company based on the generated file.

Specifically, the client terminal 200 operated by the client encrypts the 3D printing basic file provided by using the printing public key to generate the 3D printing encryption basic file, and prints the 3D printing encryption basic file to the printing company control apparatus 100. ) To send to.

Here, the 3D printing basic file may be a 3D modeling file generated by a 3D CAD program for 3D printing, for example, a file having an extension of STL, OBJ, VRML, IGS, STP, DWG, or the like.

As another example, the 3D printing basic file may be a Gcode file obtained by converting the 3D modeling file into a slicer program for the control of the 3D printer 101.

In other words, the client may generate only a 3D model file before the 3D printing request, or even a Gcode file using a slicer program.

The printing public key used by the client terminal 200 to encrypt the 3d printing basic file may be received from the encryption key management server 300 as described above.

At this time, the client terminal 200 may transmit its terminal information or client information to the encryption key management server 300 so that the corresponding information may be temporarily stored in the encryption key management server 300.

The client terminal 200 may further include usage restriction information in the 3d printing encryption basic file obtained by encrypting the 3d printing basic file using the printing public key.

The usage restriction information is for controlling 3D print output using the 3D printing basic file, which will be described later.

On the other hand, the printing company control device 100 is to enable the 3D printer 101 to output a predetermined 3D output, it is possible to directly control the 3D printer 101 to output the 3D output, or 3D printer ( In step 101, only the function of generating the necessary data may be performed.

Such a printing company control device 100 may be provided in, for example, a 3D printing company, and may be configured in an integrated form with the 3D printer 101, and distinguished from the 3D printer 101 as shown in FIG. 1. It may be configured in the form.

In the present embodiment, it is assumed that the printing company control device 100 is configured to be distinguished from the 3D printer 101.

The printing company control device 100 decrypts the 3D printing encryption base file received from the client terminal 200 using the printing private key corresponding to the printing public key, extracts the 3D printing basic file, and extracts the extracted 3D printing base file. Based on the 3D printing operation to control the progress.

Here, the printing company control device 100 receives the printing private key from the encryption key management server 300 through an encryption method and uses the received printing private key to receive the 3D printing encryption base previously received from the client terminal 200. The 3D printing basic file can be extracted by decrypting the file.

Specific functional blocks of the printing company control device 100 are as shown in FIG. 2.

As shown in the figure, the printing company control apparatus 100 includes a data receiver 110, an extractor 120, a controller 130, an encryption key receiver 140, a generator 150, and a status alerter 160. It may be configured to include).

The data receiving unit 110 performs a function of receiving a 3D printing encryption base file obtained by encrypting the 3D printing basic file using the printing public key. Here, receiving the 3D printing encryption basic file includes not only receiving via a communication network such as the Internet but also communicating with a memory device such as a universal serial bus (USB) device.

However, in this embodiment, the data receiving unit 110 receives from the client terminal 200 a 3D printing encryption base file that encrypts the 3D printing base file using the printing public key as an example.

The encryption key receiving unit 140 communicates with the encryption key management server 300 to receive a printing private key through an encryption method.

For example, the encryption key receiving unit 140 may form an encryption channel with the encryption key management server 300 and receive a printing private key using the formed encryption channel, or print using a separate asymmetric key encryption algorithm. You can also receive a private key.

At this time, the encryption key receiving unit 140 transmits the terminal information or the client information received from the client terminal 200 to the encryption key management server 300, and transmits the encryption key management server 300 to the client terminal 200. A request may be made to transmit a printing private key corresponding to the printing public key.

The extraction unit 120 performs a function of extracting the 3D printing base file through the decryption process using the printing private key corresponding to the printing public key from the 3D printing encryption base file received from the client terminal 200.

That is, the extraction unit 120 may extract the 3D printing base file from the 3D printing encryption base file through, for example, a decryption process using the printing private key received from the encryption key management server 300.

On the other hand, the generation unit 150 performs a function of slicing the decrypted 3D modeling file using the printing private key to generate an output preparation file.

For example, if the 3D printing basic file extracted by the extractor 120 is a Gcode file, the extracted 3D printing basic file is immediately an output preparation file. However, if the 3D printing basic file extracted by the extractor 120 is a 3D modeling file. In this case, the generation unit 150 generates a Gcode file that can be understood by the 3D printer 101 based on the 3D model file.

The output preparation file generated by the generation unit 150 may correspond to 'encrypted Gcode'.

That is, if a third party intercepts the Gcode in the middle, if the generation unit 150 does not perform the encryption process on the generated Gcode, it can be used again, but if the encryption process is linked to the 3D printer 101, the encryption process is performed. When executed, the encrypted Gcode file can only be understood by decrypting the 3D printer 101, but cannot be recycled even if acquired by a third party.

The controller 130 performs a function of controlling the 3D printing operation to proceed based on the 3D printing basic file extracted by the extractor 120.

For example, when the printing company control device 100 and the 3D printer 101 are directly connected through a wired cable or through a wired / wireless communication network, the controller 130 performs encrypted communication with the connected 3D printer 101. 3D printing based on the 3D basic file can be controlled to proceed.

In addition, as described above, the 3D printing encryption basic file received from the client terminal 200 may further include usage restriction information specified by the client, and the control unit 130 that obtains the usage restriction information after decryption uses the usage limit information. At least one of the time and the number of 3D printing jobs may be controlled based on the restriction information.

For example, the controller 130 may control to output up to 10 3D outputs according to the usage restriction information, and may ignore the subsequent output commands.

In addition, the controller 130 may delete all the files related to the 3D printing output at a specific time point based on the usage restriction information. In particular, the controller 130 may delete the 3D printing encryption base file received from the client terminal 200 at a time point specified in the deletion use restriction information.

On the other hand, the status notification unit 160, when the printing progress status request signal is received from the client terminal 200, the client terminal 200 for the progress of the 3D printing operation for the 3D printing basic file corresponding to the client terminal 200 Perform the function of sending to.

Accordingly, the client can monitor the 3D printing situation in real time through the operation of the client terminal 200 even without visiting the 3D printing company.

Hereinafter, the overall control and signal flow of the entire 3D printing system including the printing company control device 100 according to an exemplary embodiment of the present invention will be described with reference to FIG. 3.

First, the client terminal 200 generates a 3D printing basic file (step S1), and may transmit a printing public key request signal to the encryption key management server 300 before and after generating the 3D printing basic file (step S3).

The encryption key management server 300 generates a disposable printing public key and a printing private key according to the request of the client terminal 200 (step S5), and transmits the printing public key to the client terminal 200 (step S5). Step S7).

The client terminal 200 encrypts the 3D printing basic file using the printing public key received from the encryption key management server 300. At this time, the 3D printing encryption base file is generated (step S9).

The client terminal 200 transmits the generated 3D printing encryption basic file to the printing company control device 100 (step S11).

Meanwhile, the printing company control device 100 may form an encryption channel with the encryption key management server 300 (step S13), and the printing company control device 100 may use the encryption key management server 300 through the encryption communication channel. Request a printing private key (step S15) and receive it (step S17).

Subsequently, the printing company control apparatus 100 decrypts the 3D printing encryption base file using the received printing private key. Accordingly, the 3D printing basic file can be extracted (step S19).

The printing company control device 100 generates a Gcode file using the extracted 3D printing basic file (step S21), encrypts it (step S23), and then transmits the encrypted Gcode file to the 3D printer 101 (step S25). ).

Accordingly, the 3D printer 101 may decrypt the encrypted Gcode file received from the printing company control device 100 using the encryption key provided therein and then perform 3D printing.

In the present exemplary embodiment, the Gcode file is encrypted and provided. However, when the printing company control device 100 and the 3D printer 101 are connected by wire, the printing company control device 100 and the 3D printer 101 are provided. Of course, the cryptographic channels may be formed to communicate with each other.

Meanwhile, the client terminal 200 may transmit the 3D printing progress status request signal to the printing company control device 100 according to the client's operation (step S27). In this case, the printing company control device 100 requests the client. After checking the 3D printing progress state (step S29), the result is transmitted to the client terminal 200 (step S31).

Meanwhile, FIG. 4 illustrates a process in which the printing company control apparatus 100 adjusts the 3D printing output process according to the information specified by the client.

That is, the printing company control device 100 receives the 3D printing encryption base file from the client terminal 200 (step S41), and extracts the 3D printing basic file and the usage restriction information through the decryption process (step S43).

Then, the printing company control device 100 controls 3D printing to be performed using the extracted 3D printing basic file (step S45), and determines whether the number of 3D printing outputs is greater than the value specified in the usage restriction information. Step S47).

As a result of the determination, when the number of 3D printing outputs is larger than the value specified in the usage restriction information (step S47), the printing company control device 100 controls the 3D printing to be terminated (step S49), and collectively stores the data prepared or stored for 3D printing. It deletes (step S51).

Accordingly, the number of 3D printings is controlled according to the selection of the client who requested 3D printing, and 3D printing contents can be protected because all related data files are deleted at the end of 3D printing.

On the other hand, the process of performing each of the above-described embodiments can be performed by a program or an application stored in a predetermined recording medium (for example, computer readable). Here, the recording medium includes both an electronic recording medium such as a random access memory (RAM), a magnetic recording medium such as a hard disk, an optical recording medium such as a compact disk (CD), and the like.

In this case, the program stored in the recording medium may be executed on hardware such as a computer or a smartphone to perform the above-described embodiments. In particular, at least one of the functional blocks of the printing company control apparatus according to the present invention described above may be implemented by such a program or application.

In addition, this invention is not limited to the above-mentioned specific Example, It can implement in a various deformation | transformation and correction within the range which does not deviate from the summary of this invention.

In particular, in the above-described embodiments, the encryption key server generates and provides both a printing public key and a printing private key. However, such an encryption key server does not exist and may be formed only by a configuration between the client terminal and the printing company control device. Of course.

In this case, the printing private key should be provided in advance in the printing company control device.

However, in order to manage the encryption key such as key deletion due to the loss of the key, it is preferable to operate the encryption key server as described above.

As described above, according to the present invention, the client terminal encrypts the 3D printing basic file with the printing public key and transmits the same to the printing company control device, thereby preventing the corresponding file from being used for the acquired third party 3D printing output.

In addition, if only the printing company control device authenticated by the encryption key management server can obtain the printing private key, the printing private key may be leaked to the outside of the printing company control device as long as the structure of the printing company control device is properly controlled. This means that it is also possible to prevent external leakage of the decrypted 3D printing basic file at the printing company control device.

In other words, if 3D printing is not a normal computer, or if a 3D printing works even if it is a normal computer, if the printing private key is sent only to a computer that is authorized to prevent external leakage or duplication of internally generated files, It is possible to protect the printing basic file, that is, the 3D printing content.

In particular, if the printing public key and the printing private key are generated and used once, it is possible to minimize copyright infringement on 3D printing contents even if a key loss occurs.

Claims

In a control method of a 3D (3-Dimension) printing system comprising a client terminal and a printing company control device,

(a) the client terminal generating a 3D printing encryption basic file by encrypting an already provided 3D printing basic file using a printing public key, and transmitting the 3D printing encryption basic file to the printing company control device;

(b) the printing company control device extracts the 3D printing basic file by decrypting the 3D printing encryption basic file received from the client terminal using a printing private key corresponding to the printing public key, and extracts the 3D printing basic file. And controlling the 3D printing operation to proceed based on the file.
The method of claim 1,

It further comprises an encryption key management server,

Generating, by the encryption key management server, a printing private key and a printing public key corresponding thereto;

The client terminal receives a printing public key from the encryption key management server, encrypts an existing 3D printing basic file by using the received printing public key,

The printing company control device receives the printing private key from the encryption key management server through an encryption method, and uses the printing private key received from the encryption key management server to receive the 3D printing encryption basic file received from the client terminal. And extracting the 3D printing basic file by decoding the extracted 3D printing system.
In the control method of the printing company control device to communicate with the client terminal,

(a) receiving a 3D printing encryption base file from the client terminal by encrypting a 3D printing basic file using a printing public key;

(b) extracting the 3D printing base file by decrypting the 3D printing encryption base file using a printing private key corresponding to the printing public key, and controlling a 3D printing operation to proceed based on the extracted 3D printing base file. Control method of the printing company control device comprising a step.
The method of claim 3,

(c) generating a printing private key and a printing public key corresponding thereto and communicating with an encryption key management server for providing a printing public key to the client terminal;

In the step (b), the printing private key is received from the encryption key management server through an encryption method, and the 3D printing encryption basic file received from the client terminal is used by using the printing private key received from the encryption key management server. And decoding the 3D printing basic file to decode the printing company control apparatus.
The method according to claim 3 or 4,

The 3D printing encryption basic file received from the client terminal further includes usage restriction information designated by the client,

(e) controlling at least one of a time and a number of 3D printing jobs based on the usage restriction information.
A computer-readable recording medium having recorded thereon a program for executing the method of claim 1.
A data receiving unit for receiving the 3D printing encryption base file encrypted by using the printing public key;

An extraction unit for extracting the 3D printing encryption base file through a decryption process using a printing private key corresponding to the printing public key;

And a control unit for controlling a 3D printing operation to proceed based on the 3D printing basic file extracted by the extracting unit.
The method of claim 7, wherein

And the data receiving unit receives the 3D printing encryption basic file encrypted from the client terminal using the printing public key.
The method of claim 8,

Generates a printing private key and a printing public key corresponding thereto, and communicates with an encryption key management server that provides a printing public key to the client terminal, and receives the printing private key from the encryption key management server through an encryption method. Further comprising an encryption key receiving unit,

And the extractor extracts the 3D printing basic file by decrypting the 3D printing encryption basic file received from the client terminal using the printing private key received from the encryption key management server.
The method according to claim 8 or 9,

The 3D printing basic file is a 3D modeling file,

And a generation unit configured to generate an output preparation file by slicing the 3D modeling file decoded using the printing private key.
The method according to claim 8 or 9,

The 3D printing encryption basic file received from the client terminal further includes usage restriction information designated by the client,

And the controller controls at least one of a time and a number of 3D printing jobs based on the usage restriction information.
The method according to claim 8 or 9,

If the printing progress status request signal is received from the client terminal, the printing company further comprises a status notification unit for transmitting the progress of the 3D printing operation for the 3D printing basic file corresponding to the client terminal to the client terminal; controller.