KR19990075747A - Memory copy protection device and method - Google Patents

Abstract

Memory copy protection device and method is to prevent the copy of the external memory for storing the program in the electronic device, the memory copy device in the electronic device having a control unit, according to the control signal of the control unit Encode / decode means for scrambled a data port of at least two bits or more to convert the program to a copy protection code or to descramble the copy protection code program to detect an original program code; Storage means for storing a program of the copy protection code scrambled in the decoding / decoding means, wherein the memory copy protection method scrambles a data port of at least two bits of the program code to be stored to Converting to a program; And that there is a base made of an in detecting the original program code; and descramble (descramble) the copy protection of the stored program code to store the copy-protected program code.

Description

Memory copy protection device and method

TECHNICAL FIELD The present invention relates to a memory of an electronic device, and more particularly, to a memory copy protection device and a method for preventing copying.

In general, a ROM is a memory device that is stored without changing information while the device is in operation. The ROM is a mask program ROM that is a set of memory units in which a programmed state is determined in a production process.

The address decoder of the ROM determines whether to enable the bus to send a data word in a memory array corresponding to an applied address code.

Therefore, the data words of the corresponding memory array enabled by the address decoder are output through the bus.

However, in the electronic device according to the prior art, copying has been prevented by using a mask in manufacturing to prevent copying of a ROM in which a predetermined program is stored. However, this method is manufactured by adding another process in the manufacturing process. There are also problems that are not easy.

Accordingly, an object of the present invention is to provide a memory copy protection device for preventing a copy of an external memory for storing a program in an electronic device.

Another object of the present invention is to provide a memory copy protection method corresponding to the above apparatus.

1 is a block diagram showing a memory copy protection device according to the present invention.

FIG. 2 is a diagram illustrating an example of scramble and descramble for preventing copying of a program to be stored in the external memory of FIG. 1. FIG.

Explanation of symbols for main parts of the drawings

110: microcomputer 111: control unit

112: decoder 120: memory

A feature of the memory copy protection device according to the present invention for achieving the above object is, in an electronic device having a control unit, scramble the data port of at least 2 bits or more of the program code according to the control signal of the control unit. Encoding / decoding means for detecting an original program code by converting the program to a copy protection code or descrambles the copy protection code program, and copy protection scrambled by the encode / decode means. And storage means for storing a program of code.

A characteristic of the memory copy protection method according to the present invention for achieving the above object is, by scrambled at least two or more bits of the data port of the program code to be stored to convert the program to the copy protection code and then stored Descramble the stored copy protection code to detect the original program code.

Hereinafter, a preferred embodiment of a memory copy protection device and method according to the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing a memory copy protection device according to the present invention, a microcomputer 110 for controlling the operation of the electronic device as a whole, and a memory 120 for storing a program according to the control signal of the microcomputer 110 It is composed of

The memory 120 is a ROM.

The microcomputer 110 controls to scramble to prevent copying of a program to be stored or to descramble the stored data to detect an original program, and according to a control signal of the controller 111. Encode / decode section 112 for scrambled at least two bits of the data port of the program code to convert to the program of the copy protection code or to descramble the program of the copy protection code to detect the original program code 112 It is composed of

FIG. 2 is a diagram illustrating an example of scramble and descramble for preventing copying of a program to be stored in the external memory of FIG. 1.

A memory copy protection apparatus and method according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

D7 D6 D5 D4 D3 D2 D1 D0 35 0 0 One One 0 One 0 One 4E 0 One 0 0 One One One 0 1F 0 0 0 One One One One One AB One 0 One 0 One 0 One One 47 0 One 0 0 0 One One One 5B 0 One 0 One One 0 One One 6D 0 One One 0 One One 0 One 89 One 0 0 0 One 0 0 One F0 One One One One 0 0 0 0 C4 One One 0 0 0 One 0 0 39 0 0 One One One 0 0 One

First, when trying to store the program to be stored in the memory 120 as shown in Table 1 above, the control unit 111 in the microcomputer 110 to scramble to prevent the copy of the program to be stored in the control signal Outputs

Then, the encode / decode unit 112 scrambles the data port of at least two bits or more of the program code to be stored as shown in FIG. 2 according to the control signal of the controller 111. The program is converted into a copy protection code program as shown in the figure and output.

D7 D6 D5 D4 D3 D2 D1 D0 27 0 0 One 0 0 One One One 5C 0 One 0 One One One 0 0 1F 0 0 0 One One One One One B9 One 0 One One One 0 0 One 55 0 One 0 One 0 One 0 One 5B 0 One 0 One One 0 One One 6D 0 One One 0 One One 0 One 89 One 0 0 0 One 0 0 One E2 One One One 0 0 0 One 0 C4 One One 0 0 0 One 0 0 2B 0 0 One 0 One 0 One One

Accordingly, the memory 120 stores a program of a copy protection code output from the encode / decode unit 112 in the microcomputer 110.

Thereafter, the control unit 111 in the microcomputer 110 outputs a control signal for using the program of the copy protection code stored in the memory 120.

Then, the encode / decode unit 112 descrambles the program of the copy protection code stored in the memory 120 according to the control signal of the controller 111 to detect the original program code.

As described above, the memory copy protection device and method according to the present invention scrambles and stores at least two or more data ports of a program code in an electronic device, and then descrambles the original program to detect the original program, thereby preventing theft of an important program. There is an effect that can be prevented.

Claims (3)

In the electronic device having a control unit, Encode / decode to scramble the data port of at least two bits or more of the program code into a copy protection code or to descramble the copy protection code to detect the original program code according to a control signal of the controller Means; And storage means for storing a copy protection code scrambled by said encode / decode means. The method of claim 1, The memory copy protection device, characterized in that the ROM (ROM). Scrambled at least two bits of the data port of the program code to be stored into a copy protection code; Storing the converted copy protection code; And descrambling the stored copy protection code to detect the original program code.