TW201316197A - Method for data protection - Google Patents

Abstract

A data protection method is provided. The data protection method is applied to an embedded product and comprises steps of: identifying the embedded product is in a debug mode; identifying the embedded product is connected to a personal computer via a data line; proceeding an image distortion process to an video bitstream provided by the embedded product; and transmitting the video bitstream to the personal computer via the data line after the image distortion process.

Description

Data protection method

The invention relates to a data protection method, and in particular to a data protection method for image distortion processing of video stream data.

The use of embedded products is quite popular, and the possible operating modes of embedded products can be roughly divided into three types: one is in a normal operating mode independent of the personal computer; the other is to connect the embedded product to the personal computer. It is used as a storage device. At this time, the embedded product is in storage mode. The third is that the embedded product is connected to the personal computer through the data line, and is set to the debug mode. Generally speaking, it is set to debug mode. This mode is to debug embedded products by using the debugging tool software provided by the personal computer.

Basically, when the embedded product is in a normal operating mode independent of the personal computer, the embedded product itself can normally play video streaming data through the built-in software; when the embedded product is connected to the personal computer through the data line When in storage mode, the embedded product is treated as a general storage device, and the personal computer can access the data in the embedded product; when the embedded product is in the debugging mode, the personal computer can communicate with the embedded product. The data line captures the data and system status provided by the embedded product, and this model allows embedded product developers to assist in debugging through the development of new embedded products.

Taking the Android operating system common to embedded products as an example, manufacturers can use the Android Software Development Kit (SDK) executed on a personal computer to debug applications of embedded products and function development. The embedded product and the personal computer can establish a data connection through a USB connection or other means. Since the Android software development kit is installed on the personal computer side, the developer of the embedded product can develop according to the USB data line and the Android software. Kits, developing features for embedded products and verifying system errors.

In order to assist the system development process of embedded products, the Android software development kit provides the Android Debug Bridge (ADB) for debugging purposes. When the embedded product is in the USB debug mode, the user can perform various debugging, operating system underlying space (Linux user space) through the ADB tool.

In addition, the user interface software provided by the Adroid SDK also provides the Dalvik Debug Monitor Server (DDMS), which is used by the DDMS tool software to operate PC users. You can capture the picture played in the embedded product.

In other words, when using the ADB tool software with the DDMS tool software, the user can read and capture the image on the embedded product through the USB port. Although the purpose of the ADB tool software is to allow developers to use the personal computer for functional debugging of embedded products, the DDMS tool software can capture the function of the picture but may be used by people with the heart to illegally copy the data.

For example, if the embedded product provides legally copyrighted data, such as video bitstream, in general use, only the embedded product can play the video stream data. However, through the use of ADB tool software and USB data cable, once the embedded product is in debug mode and connected to the personal computer, the user may use the DDMS tool software on the personal computer to make the video streaming data Unauthorized copying is illegally copied to the PC.

That is to say, the data connection established between the personal computer and the embedded product in the debugging mode may cause the video data originally possessed by the embedded product to be legally copyrighted to be captured and copied on the personal computer side, and has the The possibility of illegal copying.

The invention relates to a data protection method, which is applied to an embedded product. The data protection method comprises the following steps: confirming that the embedded product is in a debugging mode; confirming that a data line is used between the embedded product and a personal computer. Establishing a connection relationship; performing an image distortion processing on the video stream data provided by the embedded product; and transmitting the video stream data processed by the image distortion to the personal computer through the data line.

According to the above concept, the data protection method according to the present invention, wherein the image distortion processing refers to: selecting an image distortion algorithm applied to the video stream data according to a distortion processing parameter.

According to the above concept, the data protection method of the present invention, wherein the distortion processing parameter comprises: a distortion determination field and a distortion selection field.

According to the above concept, the data protection method of the present invention further includes the following steps: the embedded product plays the video stream data processed by image distortion; or the embedded product plays the video string without image distortion processing. Flow data.

According to the above concept, the data protection method of the present invention, wherein the embedded product provides an operating system, and the image distortion processing is performed by one of the operating systems.

According to the above concept, the data protection method of the present invention, wherein the operating system is an Android operating system.

According to the above concept, the data protection method of the present invention, wherein the image distortion processing is a watermark processing flow, a mosaic processing flow, a scaling processing flow, a black screen processing flow, or a blurring processing flow.

In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

As mentioned above, the PC (desktop, notebook) provides an Android software development kit that allows users to access the USB data cable between the PC and the embedded product, as well as the ADB tool software provided by the Android SDK. DDMS tool software to capture and get information about embedded products.

However, the function of such data retrieval may result in the legitimate video data stream data provided by the embedded product being transmitted to the personal computer without being protected, thereby deriving the illegal copying.

To this end, the present invention proposes a data protection method for the video streaming data provided by the embedded product. The purpose is to protect the embedded products in the debugging mode after the data connection between the embedded product and the personal computer is established, to prevent the personal computer from illegally extracting the data through the tool software used in the debugging. .

For the convenience of description, the following are examples of smart phones as embedded products, and related technical contents can be easily applied to other embedded products by people skilled in the art. In addition, the following preferred embodiment assumes that the content of the video data stream contains a dynamic movie. When the played picture is at a certain time, the image picture contains three star patterns of different sizes.

Please refer to FIG. 1A, which is a schematic diagram of transmitting unprotected video streaming data through a data line between a personal computer and a smart phone in a conventional mode.

According to FIG. 1A, the personal computer 101 and the smart phone 102 are connected by the data line 103. When the smart phone 102 is in the debugging mode and plays the content of the video data stream, not only can the screen of the smart phone 102 be viewed. To the normal playing star pattern, a complete star pattern similar to the mobile phone end can also be seen on the screen of the personal computer 101. At the same time, if the personal computer 101 performs the side recording and copying of the file in the Android SDK environment, the content of the screen can be copied synchronously, and the re-stored version will become an illegal video stream version.

That is to say, according to the conventional technology, when the smart phone is in the debugging mode and the video data stream is played, the personal computer can simultaneously capture and play the same video stream.

In order to improve the situation of such illegal copying, the present invention proposes a method of performing image distortion processing when an embedded product and a personal computer establish a data connection and play in a debug mode.

Please refer to FIG. 1B, which is a schematic diagram of a video stream protected by image distortion processing through a data line between a personal computer and a smart phone in the present invention.

In the preferred embodiment, the smart phone 112 first uses the scaling process to perform an image distortion processing process on the video data stream data, thereby obtaining a smaller and less resolved image than the first image. Image screen. Of course, the image distortion processing algorithm adopted by the smart phone 112 is not limited to the scaling processing flow, but may be a watermark processing process, a mosaic processing flow, a black screen processing flow, or a fuzzy processing flow.

That is, the smart phone 112 first streams the video data for image distortion processing before transmitting the video data stream through the data line 113. Since the video data stream has been corrupted by image distortion processing, the personal computer 111 cannot receive the complete video stream content, and even if the software of the personal computer 111 attempts to capture and copy, it cannot be completed. The image content, in turn, achieves the effect of data protection.

In other words, once the embedded product enters the debugging mode and plays video data with the personal computer to play the video streaming data, the embedded product corresponds to the video streaming data according to the matched image distortion algorithm. Image distortion processing. In this way, even on the PC side, the data from the embedded product can be received through the USB port, but the received data is the distortion processed picture data, so even if the copy software is used for pirating, the copy is copied. The resulting picture data will not be viewed properly.

It should be noted that although in Figure 1B, the image images played by the smart phone and the personal computer are image-distorted, but the hardware performance of the smart phone is sufficient, the smart type The mobile phone and the personal computer may also play the original video data stream that has undergone image distortion processing without image distortion processing. Regarding the way in which smart phones and personal computers actually play video data streams, this is not a discussion because of changes in the application.

Next, the present invention will further discuss how to perform image distortion processing on video stream data. When the embedded product stores the video stream data, the present invention can utilize a distortion processing parameter to represent whether the video stream data is to be copyright protected, and the method used for copyright protection. That is to say, each video stream data has a corresponding distortion processing parameter. According to the content of the distortion processing parameter, the embedded product can be different when it is connected with the personal computer and is in the debugging mode. The playback mode is used to play the corresponding video stream data.

That is to say, for video streaming data that should be protected by copyright, the present invention provides distortion processing parameters corresponding thereto, thereby determining whether to perform distortion processing on the video data stream and the type of algorithm for performing distortion processing. Therefore, the distortion processing parameters may include a plurality of data fields, such as a distortion determination field representing whether distortion processing is to be performed, and a distortion selection field of a type of distortion processing algorithm that is desired to be used.

Certainly, whether the foregoing distortion determination field, the distortion selection field provides a preset value, and the possible value types and contents may be different according to the planning of the system, and details are not described herein again. Furthermore, the distortion processing parameter may be stored together with the video stream data as data that must be read before the individual video stream data is read, or may be stored in the memory in a corresponding table manner. Portions are all possible variations in the application without affecting the inventive concept.

In the distortion judgment field, a value of one bit can be utilized. For example, when the bit is 0, it means that distortion processing is not required, and if the bit is 1, distortion processing is performed. The value of this field can be changed according to the state of use of the embedded product. For example, when the embedded product performs a general playback operation, the value of the bit is set to 0; when the embedded product is connected to the personal computer Then, the value of the bit is set to 1.

On the other hand, since various image processing technologies have matured, the types of image distortion processing can also provide various options depending on the application of the system. Therefore, the Distortion Selection field will provide an algorithm for the manufacturer or user to select image distortion processing. The actual length (number of bits) of the distortion selection field may vary depending on the number of image distortion processing algorithms provided, and is represented by the number of bits of different lengths.

Today's embedded products provide more complex functions, and often provide operating systems to manage each function. Therefore, the image distortion processing flow here can be provided by the operating system's thread.

Furthermore, the purpose of the image distortion processing flow of the present invention is to prevent the video stream data from being improperly copied. Therefore, any data protection method capable of achieving the foregoing objectives can be employed. The image distortion processing algorithm that the manufacturer can choose to use according to the software and hardware resources of the system.

For example, the image distortion processing algorithm may adopt a watermark processing process, that is, in the video stream data, embedded copyright related information, or entrained noise, etc., as an intellectual property right authentication. The digital watermarking technology adopted here may be a visual watermarking technology or an invisible watermarking technology.

Of course, other types of image distortion processing methods, for example, the video streaming data is added to the mosaic processing flow, so that the user cannot normally view the video streaming data, scale the video streaming data, and process the black screen. Or the method of obfuscating the processing, etc., can also be used as the selection of the present invention in data protection.

Please refer to FIG. 2, which is a flow chart of a method for providing data protection for a video stream in a smart phone according to a preferred embodiment of the present invention. The data protection method disclosed in the preferred embodiment can be understood in conjunction with FIG. 1B. The data protection method herein includes the following processes: starting an application provided by the Android SDK (step S21); and previewing the Android application ( Step S22): determining whether the embedded product is connected to the personal computer through the data line (step S23); determining whether the personal computer is used with the ADB tool software and the DDMS tool software (step S24); determining whether the embedded product is in the debugging mode (Step S25).

If the judgment results of steps S23, S24, and S25 are affirmative, it means that the embedded product and the personal computer are in the corresponding debugging mode, that is, the video data stream in the embedded product may be transmitted through the data line. To the personal computer, the video distortion processing flow is performed on the video data stream (step S26); otherwise, the video data stream processing is not particularly performed.

After the step S26 is completed, the embedded product transmits the video stream data subjected to the image distortion processing to the personal computer through the data line by the embedded product (step S27). Therefore, the personal computer can only play the video stream data that has been subjected to image distortion processing, thereby preventing the video data stream from being illegally captured and copied.

Please refer to FIG. 3, which is a flowchart of a data protection method for video streaming provided by the present invention. In summary, the data protection method provided by the present invention can be summarized in several steps: confirming that the embedded product is in the debug mode (step S31); confirming that the embedded product is connected to the personal computer through the data line (steps) S32): performing image distortion processing on the video stream data provided by the embedded product (step S33); and the embedded product transmitting the video distortion processed video stream data to the personal computer through the data line (step S35).

In this process, the sequence of steps S31 and S32 can be reversed, and the personal computer connected to the embedded product cannot receive video information because the video stream data has been subjected to image distortion processing when receiving and playing video stream data. Streaming data is illegally copied. In addition, although the video streaming data received by the personal computer is a version that has been affected by the distortion processing, the video streaming data used for playback can be used in accordance with the system function planning. Image distortion processing, or video streaming data without image distortion processing.

In short, the present invention uses image distortion processing on video streaming data to avoid illegal copying of copyrighted video streaming data through the connection of data lines when the embedded product is connected to the personal computer. Therefore, when the embedded product is connected to the personal computer and the video stream data provided by the embedded product is played by the personal computer, the content of the legally authorized video stream data is protected by the image distortion processing.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

101, 111. . . personal computer

102, 112. . . Smart phone

103, 113. . . Data line

Figure 1A shows a schematic diagram of unprotected video streaming data transmitted through a data line with a personal computer using a smart phone of the conventional technology.

FIG. 1B is a schematic diagram of a smart phone with the method of the present invention transmitting a video stream data protected by image distortion processing through a data line between the personal computer and the personal computer.

2 is a flow chart of a method for providing data protection for a video stream in a smart phone according to a preferred embodiment of the present invention.

FIG. 3 is a flow chart of a data protection method for video streaming provided by the present invention.

Claims (7)

A data protection method is applied to an embedded product, and the data protection method comprises the steps of: confirming that the embedded product is in a debugging mode; confirming that the embedded product is connected to a personal computer through a data line; The video stream data provided by the product is subjected to an image distortion processing; and the video stream data processed by the image distortion is transmitted to the personal computer through the data line. The data protection method according to claim 1, wherein the image distortion processing refers to: selecting an image distortion algorithm applied to the video stream data according to a distortion processing parameter. The data protection method according to claim 2, wherein the distortion processing parameter comprises: a distortion determination field and a distortion selection field. The method for protecting data according to claim 1, further comprising the steps of: playing the video stream data processed by the image distortion processing; or the embedded product playing the video without image distortion processing Streaming data. The data protection method of claim 1, wherein the embedded product provides an operating system, and the image distortion processing is performed by one of the operating systems. The data protection method according to claim 5, wherein the operating system is an Android operating system. The data protection method according to claim 1, wherein the image distortion processing is a watermark processing flow, a mosaic processing flow, a scaling processing flow, a black screen processing flow, or a blurring processing flow.