KR20130034784A - Watermark relay device, method and system for efficient information transmission - Google Patents

Abstract

PURPOSE: A watermark relay device for efficiently transmitting information, a method thereof, and a system thereof are provided to combine two or more algorithms which show excellent performance for specific environment, thereby improving the performance in various environments. CONSTITUTION: A first watermark detection unit(104) receives an input signal(102) which includes contents and a first watermark from a first terminal. The first watermark detection unit detects the first watermark from the input signal. A watermark conversion unit(106) converts the first watermark into a second watermark. The watermark conversion unit changes the setting necessary for the conversion and insertion of the second watermark. A second watermark insertion unit(108) outputs an output signal(112), which includes the second watermark, to a second terminal. The first watermark and the second watermark have a different environment feature for content. [Reference numerals] (100) Watermark relay device; (102) Input signal; (104) First watermark detection unit; (106) Watermark conversion unit; (108) Second watermark insertion unit; (110) Input signal control unit; (112) Output signal;

Description

Watermark relay device, method and system for efficient information transmission

The present invention relates to a watermark relay method and system for more efficient information transfer in transmitting and receiving contents requiring copyright protection. More specifically, the combination of two or more watermarking algorithms having different characteristics is excellent in various environments. An invention is directed to a watermarking relay device, method and system for exhibiting performance.

Watermarking technology is a technology for non-cognitively (or cognitively) inserting and extracting additional information into content such as images, audio, video, and text. In response to the development of storage media and communication technology, especially the Internet, It is recently emerging as a technology for protecting copyright. Here, the additional information refers to information about the copyright holder and the owner, buyer information, and other control information.

Watermarking technology can be used for various purposes according to the type of information to be inserted. If the owner's information is inserted, the owner's information can be extracted and the illegal copy can be determined. It allows you to trace back the buyer who originally leaked the content. It also enables other additional services, such as restricting the use of content, detecting forgery, and tampering, depending on the information inserted.

The requirements to be considered for the development of this watermarking technology are as follows.

Imperceptibility

In particular, an important requirement in invisible watermarking technology is the condition that the quality of the content after the watermark is inserted should remain the same as before the insertion. For example, when a watermark is inserted into the music, the difference between the original music and the watermarked music must be indistinguishable from the listener, and in the case of video or video, the difference in image quality should not be felt. .

Robustness

Toughness is an important requirement to be considered for copyright owners, and the condition that watermarks should be detected by the owners in various attacks. For example, attacks on images include lossy coding, filtering, scaling, contrast enhancement, clipping, requantization, rotation, and translation, such as JPEG. have. Such an attack is an attempt to remove the watermark by losing synchronization between the owner's watermark and the embedded watermark upon watermark detection, and the watermarking technique for the image should be very robust to this attack.

-Capacity

Watermarks embedded in content of limited size are represented in bits by the amount of information that can be accommodated. In order to accommodate a lot of information such as the information of the copyrighted work or the buyer's information, a large insertion amount must be secured.

-Detection rate (False Negative Alarm, False Positive Alarm)

The detection rate indicates the probability of detecting the watermark accurately in the watermarked content. It is a false negative alarm indicating the degree of successful detection and a false positive alarm indicating the degree of inaccurate watermark detection. Divided. The false detection rate is also called a decision error and should be designed to have a very small value because it may have a big negative effect on the authenticity of the watermark with the probability that a watermark other than the inserted watermark is detected.

These requirements may vary depending on the target content and the field of application. Toughness, non-cognition, and the amount of information insertion need to be appropriately corrected according to the applied field in the trade-off relationship.

Conventional watermarking techniques have typically been made to suit a particular environment. This is because the watermarking algorithm used in the conventional watermarking technology is designed and used to have excellent performance in a specific environment. The environment referred to herein refers to various factors that make the watermark difficult to detect, and may include compression, noise addition, A / D or D / A conversion, time scaling, pitch shift, sound quality degradation, and image distortion.

However, it is generally difficult to implement an algorithm that shows excellent performance in a specific environment in which a watermarking algorithm that exhibits excellent performance in a specific environment does not show excellent performance in an environment different from that of a specific environment. For example, a watermarking algorithm that is resistant to compression may have a very weak point for A / D or D / A conversion, and a watermarking algorithm that is strong for A / D or D / A conversion may have a weak point for compression. May have

The present invention is to improve the problems of the prior art, to implement a watermarking technique that shows excellent performance in various environments.

The watermark relay apparatus for efficient information transmission comprises: a first watermark detection unit for receiving an input signal including content and a first watermark from a first terminal, and detecting a first watermark from the received input signal; A watermark conversion unit for converting the watermark into a second watermark, and a second watermark embedding unit for outputting an output signal including the second watermark to the second terminal, wherein the first watermark and the second watermark The mark is based on the same watermark information, the first watermark and the second watermark have different environmental characteristics for the content, and the watermark converting unit may be configured to change settings necessary for the conversion and insertion of the second watermark. have. In this case, the watermark information may include at least one or more of user information, copyright information, content duplication information, distribution information, illegal information, and billing information.

Preferably, the watermark relay apparatus further includes an input signal controller for determining whether to transmit the input signal to the second watermark inserting unit, wherein the second watermark inserting unit is according to the determination of the input signal controller. An input signal may be selectively received to generate a signal obtained by embedding a second watermark in the input signal or the second watermark as the output signal.

Preferably, the first watermark detection unit may be replaced with a wired / wireless input / output unit configured to transmit / receive the first watermark in a wired / wireless manner, or the second watermark insertion unit may be configured to transmit / receive the second watermark in a wired / wireless manner. It may be replaced by a wired or wireless input / output unit.

In one embodiment, the watermark relay apparatus may operate independently of the first terminal and the second terminal. In yet another embodiment, the watermark relay device may be operated in the first terminal.

The watermark relay method may include obtaining an input signal from a first terminal, detecting a first watermark from the obtained input signal, converting the detected first watermark into a second watermark, and a second watermark. Generating an output signal including the mark and outputting the generated output signal to the second terminal, wherein the first watermark and the second watermark are based on the same watermark information, The second watermark has different environmental characteristics for the content, and the step of converting to the second watermark may be configured to change settings necessary for the conversion and insertion of the second watermark. In this case, the watermark information may include at least one or more of user information, copyright information, content duplication information, distribution information, illegal information, and billing information.

Preferably, the method may further include determining whether to use an input signal to generate an output signal after converting to the second watermark and before generating the output signal. The outputting of the output signal to the second terminal may include selectively receiving the input signal according to the determination in the step of determining whether to use the input signal as the output signal, or inserting a second watermark into the input signal. The method may further include generating a second watermark as an output signal.

The watermark relay system includes a first terminal for reproducing content inserted with a first watermark, a watermark relay device for converting and transmitting a first watermark to a second watermark, and extracting a second watermark and a related service. A watermark relay device comprising: a first watermark detection unit for receiving a content having a first watermark embedded therein as an input signal and detecting a first watermark from the input signal; A watermark converting unit for converting the first watermark into a second watermark, and a second watermark inserting unit for outputting an output signal including the second watermark to the second terminal, the first watermark and the second watermark The mark is based on the same watermark information, the first watermark and the second watermark have different environmental characteristics for the content, and the watermark converting unit converts the second watermark and It may be further configured to change the settings required for your mouth.

Preferably, the watermark relay apparatus in the watermark relay system may further include an input signal controller for determining whether to transmit an input signal to the second watermark inserter, and the second watermark inserter may further include an input signal controller. According to the determination, the input signal may be selectively received to generate a signal having a second watermark embedded in the input signal or a second watermark as an output signal.

Preferably, the first watermark detection unit may be replaced with a wired / wireless input / output unit configured to transmit / receive the first watermark in a wired / wireless manner, or the second watermark insertion unit may be configured to transmit / receive the second watermark in a wired / wireless manner. It may be replaced by a wired or wireless input / output unit. In this case, the wired / wireless input / output unit may use RS232, RS482, or a wired IP network network for wired communication, and WIFI, Bluetooth, Zigbee, or wireless USB for wireless communication. have.

In one embodiment, the watermark relay system may operate independently of the first terminal and the second terminal. In another embodiment, the watermark relay system may be operated within the first terminal.

By combining two or more algorithms that exhibit excellent performance for a particular environment, a watermark relay method and system with improved performance for various environments can be implemented.

1 illustrates a functional block diagram of an exemplary watermark relay system.
2 shows a flowchart of an exemplary watermark relay system.
3 shows a schematic diagram of a watermark relay system, in accordance with an embodiment of the present invention.
4 shows a schematic diagram of a watermark relay system, in accordance with another embodiment of the present invention.
5 shows a schematic diagram of a watermark relay system, in accordance with another embodiment of the present invention.
6 shows a schematic diagram of a watermark relay system, in accordance with another embodiment of the present invention.
7 illustrates a functional block diagram of another exemplary watermark relay system.
8 illustrates a functional block diagram of another exemplary watermark relay system.
9 shows a schematic diagram of a watermark relay system, in accordance with another embodiment of the present invention.

1 is a functional block diagram of an exemplary watermark relay system 100. The watermark relay system 100 is configured by integrating the first watermark detection unit 104, the watermark conversion unit 106, the second watermark insertion unit 108, and the input signal control unit 110.

The input signal 102 is a signal for the content in which the first watermark information is inserted. The content may be image content, audio content, or video content. When content is played back, whether or not the first watermark information has been inserted is usually not identified to the content user. A first watermark embedding algorithm is used to embed the first watermark information in the content.

 The first watermark detection unit 104 functions to detect the first watermark information from the input signal 102 which is a signal for the content in which the first watermark information is inserted. A first watermark detection algorithm is used to detect the first watermark information, and the first watermarking algorithm comprising the first watermark embedding algorithm and the first watermark detection algorithm is, for example, compressed or partially cropped. While resistant to attack, it may have a property that is easily degraded to noise addition or A / D conversion (or D / A conversion).

 The watermark converter 106 performs a function of converting the first watermark information into the second watermark information. Here, the first watermark information and the second watermark information are based on the same watermark information and are based on different algorithms suitable for specific environmental characteristics. Specifically, the watermark information includes user information, copyright information, copy information of content, It may include at least one or more of distribution information, information on whether or not illegal, and information on whether or not to be charged.

In addition, the watermark converter 106 performs not only a function of converting the first watermark into a second watermark but also various functions required for generating the second watermark. For example, when the first watermark is an audio watermark and the second watermark is a video watermark, in order to insert watermark information including user information or the like into the video watermark, a frame rate required for video watermarking is required. It may also perform a function of setting various conditions such as an image resolution for inserting a watermark, a watermark insertion section, and a watermark insertion intensity.

In addition, as in the case of FIG. 7, the watermark conversion unit 106 uses the information acquired by the wired / wireless input / output unit when the first watermark detection unit is replaced with the wired / wireless input / output unit 704. 8, and when the second watermark insertion unit is replaced with the wired / wireless input / output unit 808, as shown in FIG. 8, the protocol of the first watermark transferred from the first watermark detection unit is used as a protocol of the wired / wireless input / output unit. It is responsible for organizing the information to match.

The second watermark inserting unit 108 uses the second watermark information, which is an output signal of the watermark converting unit 104, and an input signal 102, which is an output signal of the input signal control unit 110, to generate a watermark relay system ( 100) to produce the output signal. The second watermarking algorithm including the second watermark embedding algorithm used to embed the second watermark in the input signal is different from the above-described first watermarking algorithm, and in particular, has a complementary characteristic. For example, while the first watermarking algorithm has characteristics that are resistant to compression or some cropping attacks, while it is easily degraded by noise addition or A / D conversion (or D / A conversion), the second watermarking Although the algorithm is very vulnerable to compression, it may have a strong characteristic indicating a high detection rate against A / D conversion (or D / A conversion) attack, which is a disadvantage of the first watermarking algorithm. That is, by selecting the second watermarking algorithm that compensates for the shortcomings of the first watermarking algorithm, it is possible to enjoy the advantages of both algorithms.

The input signal controller 110 determines whether or not to transmit the input signal 102 to the output, which is controlled by a control signal from the watermark converter 106 and embeds the second watermark into the input signal 102. It performs the function of controlling whether or not to deliver to the unit 108. When the input signal controller 110 is ON, the input signal 102 is transmitted to the second watermark inserting unit 108, and when it is OFF, the input signal 102 is not transmitted to the second watermark embedding unit 108. Do not.

The output signal 112 is an output signal of the watermark relay system 100. When the input signal control unit 110 is turned on and the input signal 102 is transmitted to the second watermark inserting unit 108, the input signal is output. The signal into which the second watermark information is inserted into the 102 may be the output signal 112. If the input signal control unit 110 is turned off and the input signal 102 is not transmitted to the second watermark inserting unit 108, only the second watermark signal is output as the output signal 112.

7 illustrates a functional block diagram of another exemplary watermark relay system 700. In the watermark relay system shown in FIG. 7, the first watermark detection unit 104 is replaced with the wired / wireless input / output unit 704 in the watermark relay system of FIG. 1. Instead of acquiring the first watermark information by the first watermark detection unit as in the watermark relay system 100 of FIG. 1, the watermark relay system 700 directly uses the wired / wireless input / output unit 704 to perform the first watermark information. Receive watermark information. That is, the input signal of the watermark relay system 700 becomes the first watermark information.

8 illustrates a functional block diagram of another exemplary watermark relay system 800. In the watermark relay system illustrated in FIG. 8, the second watermark insertion unit 108 is replaced with the wired / wireless input / output unit 808 in the watermark relay system of FIG. 1. Instead of the second watermark inserting unit 108 inserting watermark information into an input signal and outputting the watermark information in the watermark relay system of FIG. 1, the watermark relay system 800 uses a wired / wireless input / output function 808. 2 Send watermark information. In other words, the output signal of the watermark relay system 800 becomes the second watermark information.

Wired and wireless input and output functions used in Figures 7 and 8 may be a function for communicating by wire, such as RS232, RS482, wired ip network in a wired communication manner, and in the case of wireless, WIFI, Bluetooth (Bluetooth), It may also function for short-range wireless communication such as Zigbee and wireless USB.

2 shows a flowchart of an exemplary watermark relay system. The input signal obtaining step 201 is a step of obtaining an input signal input to the watermark relay system. The first watermark detection step 202 is a step of detecting the first watermark from the input signal. The watermark converting step 203 converts the detected first watermark into a second watermark, wherein the first watermark and the second watermark are based on the same watermark information, respectively, Based on different algorithms suitable for. The watermark conversion step 203 may also include changing a setting necessary for generating the second watermark. The second watermark generation step 204 is a step of generating a second watermark signal converted in the watermark conversion step 203. In the next step of determining the input signal use step 205, it is determined whether or not to use the input signal as an output signal of the watermark relay system. If it is determined that the input signal is used, an output signal is constructed by inserting the second watermark signal generated in step 203 into the input signal. If it is determined that the input signal is not used, the output signal is composed of only the generated second watermark signal. The output signal generating step 207 is a step of generating an output signal of the watermark relay system. Produces an output signal appropriate for the application.

3 shows a schematic diagram of another exemplary watermark relay system. The first terminal 301 plays the content in which the first watermark is inserted. The first terminal 301 may be a TV. The audio of the reproduced content is input to the watermark relay system 303. The watermark relay system 303 shown in FIG. 3 is an independent device and may operate independently of the first terminal 301 and the second terminal 309. The watermark relay device 305 may be the watermark relay system 100 of FIG. 1. The audio signal output from the first terminal enters an input of the second terminal 309 used by the user. The output signal of the watermark relay system also enters the input of the microphone 307 connected to the second terminal. The output signal may be a signal having a second watermark embedded in the audio signal output from the first terminal or a signal composed of only the second watermark. Here, most of the microphones may use dedicated microphones mounted on smart network terminals. The second terminal 309 detects the second watermark using the audio signal input to the terminal and proceeds with the related service.

In this case, the second terminal 309 may be a smart network terminal, and the smart network terminal is a terminal capable of connecting to the Internet through a network. By using the second watermark detected from the signal input to the smart network terminal, it is also possible to provide services such as advertisements, additional information linking service, viewership survey, social commerce, etc. related to the program currently being aired on the first terminal. Even when the smart network terminal is in an environment that is not connectable to the Internet, the second watermark detected from a signal input to the smart network terminal may be used to provide the above service even using only its own built-in function. Can be. In addition, the second terminal 309 is not only a smart network terminal, but also a general terminal (i.e., MP3, electronic dictionary, PMP, etc.), household appliances and toys (e.g., anime character toys, etc.) having no connection function to the network. It may be implemented as.

4 shows a schematic diagram of another exemplary watermark relay system. The first terminal 401 plays back the content with the first watermark embedded therein. The first terminal may be a TV. The audio reproduced at the first terminal enters the watermark relay system 403 inside the first terminal. The watermark relay system may be implemented in software and included in an output device such as a TV to operate. An output signal of the watermark relay device (that is, an audio signal having a second watermark or a second watermark signal) is output in the form of an audio signal using an output device such as a speaker of the first terminal. The output audio signal is input to the microphone 407 connected to the second terminal 409. In this case, the microphone may mostly use a dedicated microphone mounted on the second terminal. The second terminal 409 detects the second watermark using the input audio signal and proceeds with the related service. The second terminal may be a smart network terminal.

5 shows a schematic diagram of another exemplary watermark relay system. The first terminal 501 plays the content in which the first watermark is inserted. The first terminal may be a TV. The reproduced audio signal enters the watermark relay device 505 inside the first terminal. The watermark relay system 503 may be implemented in software to operate inside the first terminal 501. The software implemented watermark relay system 503 detects the first watermark using the audio signal input inside the first terminal and does not insert the detected first watermark information into the second watermark information. Instead, the watermark information is transmitted using a wired / wireless input / output device in a form other than an audio signal. For reference, the watermark relay system 503 of FIG. 5 may also be represented by the watermark relay system shown in FIG. 8.

Here, the wired / wireless input / output devices 506 and 507 may use RS232, RS482, wired ip network, etc. as a wired communication method, or wirelessly communicate with WIFI, Bluetooth, Zigbee, and wireless USB. For example, a method for short-range wireless communication may be used.

The second terminal 509, which may be a smart network terminal, also includes a wired / wireless input / output device 507, wherein the wired / wireless input / output device 507 of the second terminal is a wired / wireless data transmitted from the first terminal, that is, a watermark. Receive wired or wireless data that contains information. The second terminal 509 displays the related information on the display device 508 of the second terminal using the received data.

6 shows a schematic diagram of another exemplary watermark relay system. The first terminal 601 plays back the content with the first watermark embedded therein. The first terminal may be a TV. The first terminal 601 transmits the first watermark information to the watermark relay system 603 using the wired / wireless input / output device 602 included in the first terminal. At this time, the watermark relay system may not include the function of detecting the first watermark as an independent function. The watermark relay system including the wired / wireless input / output function instead of the function of detecting the first watermark is shown in detail in FIG. 7. The watermark relay system 603 may be a device independent of the first terminal and the second terminal. The wired / wireless input / output device 604 included in the watermark relay system 603 communicates with the wired / wireless input / output device 602 of the first terminal to receive first watermark information. The received first watermark information is converted into a second watermark by a watermark relay device (watermark conversion device) 605, and watermark information in the form of an audio signal is generated. The generated audio signal is output using a speaker built in the watermark relay system 603.

Here, the wired / wireless input / output devices 602 and 604 may use RS232, RS482, a wired ip network as a wired communication method, or wirelessly communicate with WIFI, Bluetooth, Zigbee, and wireless USB. For example, a method for short-range wireless communication may be used.

The second terminal 609 receives the audio signal output from the first terminal including the content information together with the audio signal including the second watermark information using the microphone 607 connected thereto. The second terminal may be a smart network terminal. The second terminal 609 may detect the second watermark information in the audio signal input from the microphone and provide a related service.

9 shows a schematic diagram of another exemplary watermark relay system. The watermark relay system 800 of FIG. 8 may be used for the watermark relay system shown in FIG. 9. In FIG. 9, the watermark relay system 903 may be implemented as an independent device.

The first terminal 901 plays the content in which the first watermark is inserted. The first terminal may be a TV. The watermark relay system 903 detects the first watermark information from the audio signal output from the first terminal and transmits the detected first watermark information to the second terminal 909 using the wired / wireless input / output device 906. You can also provide The watermark relay system 903 may include a microphone 902 or the like capable of receiving an audio signal as an input device. The audio signal input by the input device 902 is input to the watermark relay device 905. The watermark relay device 905 may perform a function of detecting a first watermark from the input audio signal and converting the detected first watermark into a second watermark. The converted second watermark may be exchanged with the wired / wireless input / output device 907 of the second terminal 909 by using the wired / wireless input / output device 906, and in case of wired communication, RS232, RS482, or wired IP network If you use a network and communicate wirelessly, you can use WIFI, Bluetooth, Zigbee, or Wireless USB. The second terminal may provide a related service from information on the second watermark input by the wired / wireless input / output device 907.

As described above, the present invention improves performance in various environments by combining a second watermarking algorithm, which converts (and embeds) the first watermark into a second watermark to compensate for the shortcomings of the first watermarking algorithm. That is, it is possible to implement a watermarking technology having a higher toughness than the conventional watermarking technology.

The invention may be implemented in various ways. In addition, the descriptions provided before the disclosed embodiments are provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. Thus, the present invention is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (17)

A first watermark detection unit receiving an input signal including a content and a first watermark from a first terminal and detecting the first watermark from the input signal;
A watermark converting unit converting the first watermark into a second watermark; And
A second watermark embedding unit configured to output an output signal including the second watermark to a second terminal,
Wherein the first watermark and the second watermark are based on the same watermark information, the first watermark and the second watermark have different environmental characteristics for the content,
And the watermark converting unit is further configured to change a setting necessary for converting and embedding the second watermark. The method of claim 1,
And an input signal controller configured to determine whether to transmit the input signal to the second watermark inserting unit.
The second watermark inserting unit selectively receives the input signal according to the determination of the input signal controller, and generates a signal obtained by embedding the second watermark in the input signal or the second watermark as the output signal. A watermark relay device, characterized in that. The method of claim 1,
And the first watermark detection unit is replaced with a wired / wireless input / output unit configured to transmit and receive the first watermark in a wired or wireless manner. The method of claim 1,
And the second watermark inserting unit is replaced with a wired / wireless input / output unit configured to transmit and receive the second watermark in a wired or wireless manner. The method according to any one of claims 1 to 4,
And the watermark relay device is operated independently from the first terminal for outputting the input signal and the second terminal for receiving the output signal. The method according to any one of claims 1 to 4,
And the watermark relay device is operated in the first terminal. The method of claim 1,
And the watermark information comprises at least one of user information, copyright information, copy information of contents, distribution information, information on illegal status, and information on billing status. Acquiring an input signal from a first terminal;
Detecting a first watermark from the input signal;
Converting the detected first watermark into a second watermark; And
Generating the output signal including the second watermark and outputting the generated output signal to a second terminal;
Wherein the first watermark and the second watermark are based on the same watermark information, the first watermark and the second watermark have different environmental characteristics for the content,
The converting to the second watermark is further configured to change a setting necessary for converting and embedding the second watermark. The method of claim 8,
After converting to the second watermark and before generating the output signal, determining whether to use the input signal for the output signal;
Generating the output signal and outputting the generated output signal to the second terminal, selectively receiving the input signal according to the determination in the step of determining whether to use the input signal for the output signal, And generating the signal in which the second watermark is inserted into the input signal or the second watermark as the output signal. The method of claim 8,
And the watermark information includes at least one of user information, copyright information, copy information of contents, distribution information, information on illegality, and information on whether or not to be charged. A first terminal for playing the content having the first watermark embedded therein;
A watermark relay device converting the first watermark into a second watermark and transmitting the converted watermark; And
A second terminal extracting the second watermark and providing a related service;
The watermark relay device,
A first watermark detection unit which receives the first watermark-embedded content from the first terminal as an input signal and detects the first watermark from the input signal;
A watermark converting unit converting the first watermark into a second watermark, and
A second watermark embedding unit configured to output an output signal including the second watermark to the second terminal,
Wherein the first watermark and the second watermark are based on the same watermark information, the first watermark and the second watermark have different environmental characteristics for the content,
And the watermark converting unit is further configured to change a setting necessary for converting and embedding the second watermark. The method of claim 11,
The watermark relay apparatus further includes an input signal controller for determining whether to transmit the input signal to the second watermark inserting unit.
The second watermark inserting unit selectively receives the input signal according to the determination of the input signal controller, and generates a signal obtained by embedding the second watermark in the input signal or the second watermark as the output signal. Watermark relay system, characterized in that. The method of claim 11,
And the first watermark detection unit is replaced with a wired / wireless communication unit configured to transmit and receive the first watermark in a wired or wireless manner. The method of claim 11,
And the second watermark inserting unit is replaced with a wired / wireless communication unit configured to transmit and receive the second watermark in a wired or wireless manner. 15. The method according to any one of claims 11 to 14,
And the watermark relay system is operated as a device independent of the first terminal and the second terminal. 15. The method according to any one of claims 11 to 14,
And the watermark relay system is operated in the first terminal. The method according to claim 13 or 14,
The wired / wireless communication unit may use RS232, RS482, or a wired IP network for wired communication, and WIFI, Bluetooth, Zigbee, or wireless USB for wireless communication. Watermark relay system.

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