KR20010037452A - Method for writing and playing a data to/from an optical disc - Google Patents

Abstract

PURPOSE: A method for recording and reproducing a data of a recorder is provided to grant read/write authority by setting up a password. CONSTITUTION: If a user inserts an optical disk(26) into an optical disk driving apparatus(200), the optical disk driving apparatus ascertains whether the inserted recordable optical disk(CD-R or CD-RW) is a blank disk or a disk having a password approachable to the recordable optical disk at a step 11. The ascertained result is reported to an authoring software, which is mounted on a hard disk(10) and is executed by a central processing unit(11). The user inputs an original password at a step 20. The central processing unit(11) constitutes a packet command according to an ATAPI protocol by using the inputted password and a password recognizing opcode, and transfers the packet command to the optical disk driving apparatus(200) through an ATAPI interface part(21) of the partners's side at a step 21. A micom(32) copies the password several times and forms the same into blocks having a uniform size and transfers the blocks to a digital record signal processing part(23). The digital record signal processing part(23) adds an error correction parity for reliability of record and reproduction to the password blocks and generates an error correction code blocks(ECC blocks). A channel bit encoder(24) converts a digital bit stream output by the digital record signal processing part(23) into a pulse-width modulated signal to be recorded on the optical disk(26) and applies the same to a light driver(25). The micom(32) controls a pick-up part(27) to be positioned on a pertinent record area of a file system through a servo part(30), controls the optical driver(25) to output a record signal due to an optimum light driver current. The light driver(25) applies the signal according to an optical disk driving force to the pick-up part(27) and permits the signal of the pulse-width modulated password blocks to be recorded on the record area of the optical disk file system at a step 22. The micom(32) memorizes the record passwords. An encoder encodes the inputted data by using an equation of higher degree generated by the password, and the encoded data is recorded on the data area on the optical disk(26) by the pick-up part(27).

Description

Method for writing and playing data on a recording medium {Method for writing and playing a data to / from an optical disc}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of recording and reproducing data on a recording medium, wherein a unique password of a user is recorded on the recording medium so that only a legitimate user can record data on the recording medium and reproduce the recorded data. The present invention relates to a data recording and reproducing method.

Conventionally, when another person randomly reproduces data recorded on a recordable CD (R) or another person arbitrarily reproduces or deletes and rewrites data recorded on a rewritable CD (CD-RW), There was no way to prohibit this. As a result, there was a great concern that important information recorded on recordable CDs would be exposed to others or data on CDs would be lost by others.

In order to prevent this, the user sets a password in the OS or BIOS of the PC so that only the user who has set the password can use the PC or drive a disk in a driver installed in the PC. When the disc is driven by another PC after the disc is ejected by another person, there is a problem that the use thereof cannot be prohibited.

Accordingly, the present invention has been created to solve the above problems, by recording the password set by the user on the recording medium, so that only a legitimate user can record the data on the recording medium and reproduce the recorded data. It is an object of the present invention to provide a method for recording and reproducing data.

FIG. 1 shows a part of a personal computer (PC) in which a method of recording and reproducing data on a recording medium according to the present invention and an optical disk driver connected to the PC by an ATAPI interface method.

Fig. 2 shows the flow of a preferred embodiment of a data recording method on a recording medium according to the present invention;

Fig. 3 shows the flow of a preferred embodiment of the recording medium reproducing method according to the present invention;

Figure 4a shows a part of the opcode according to the ATAPI protocol,

4B illustrates the format of a packet command according to the ATAPI protocol including a user password to be recorded on a recording medium.

Fig. 5 shows each signal area on the optical disc.

※ Explanation of code for main part of drawing

10 hard disk 11 central processing unit

12: video adapter 13: monitor

14,21: ATAPI interface unit 15: ROM

22: encoder 23: digital recording signal processing unit

24 channel bit encoder 25 optical driver

26: optical disc 27: pickup portion

28: R / F section 29: drive section

30: servo unit 31: digital reproduction signal processing unit

32: micom 33: decoder

100: PC 200: optical disk drive device

A data recording method on a recording medium according to the present invention for achieving the above object, the first step of checking the recording state of the inserted recording medium; A second step of requesting input of a user's password according to the verification result; And a third step of recording the input password in a specific area on the recording medium.

In addition, the recording medium reproducing method according to the present invention includes a first step of requesting input of a password of a user when a reproduction request of an inserted recording medium is performed; A second step of comparing the input password with a password recorded on the recording medium; And a third step of decoding and reproducing the data recorded on the recording medium using the input password according to the comparison result.

Best Mode for Carrying Out the Invention A preferred embodiment of a method of recording and reproducing data on a recording medium according to the present invention will now be described in detail with reference to the accompanying drawings.

1 is a PC 100 in which a preferred embodiment of a method of recording and reproducing data on a recording medium according to the present invention is implemented, and an optical disk driver connected to the PC 100 in an ATAPI interface manner. As a detailed configuration of 200, the PC 100 includes: a ROM 15 in which a system program is stored; A central processing unit 11 for loading and executing a program from the ROM 15 or the hard disk 10 according to a user's request; A video adapter 12 for converting information to be transmitted to a user into a video signal and outputting the information to a monitor 13; And an ATAPI interface unit 14 for exchanging data with the optical disk drive unit 200 according to the ATAPI protocol, wherein the optical disk drive unit 200 comprises: an ATAPI interface unit 21; An encoder 22 for encrypting the digital data input from the ATAPI interface unit 21 using a user password; A digital recording signal processor (23) for adding an error correction code (ECC) or the like to the encrypted digital data to convert it into a recording format; A channel bit encoder (24) for reconverting the data converted into the recording format into a bitstream; An optical driver 25 for outputting a light quantity driving signal according to an input signal; A pickup section 27 for recording a signal on the optical disc 26 and detecting a recording signal from the recording surface in accordance with the light quantity driving signal; A drive unit 29 for driving the pickup unit 27 and the motor M; An R / F unit 28 for filtering the signal detected by the pickup unit 27 and outputting the result as a binary signal; A servo unit 30 for controlling the driving of the drive unit 29 from the tracking error (T.E) and focus error (F.E) signals of the pickup unit 27 and the rotational speed of the optical optical disc 26; A digital reproduction signal processor (31) for restoring the binary signal into encrypted data with its clock synchronized with the binary signal; A decoder (33) for decoding and outputting the decompressed digital data using encrypted data using a user password; And a microcomputer 32 for controlling the data recording and reproducing process based on the user's password.

2 and 3 show the flow of a preferred embodiment of a data recording and reproducing method on a recording medium according to the present invention, respectively. FIG. 2 and FIG. 3 according to the present invention with reference to the detailed configuration of FIG. The data recording method and the recording data reproduction method will be described in detail.

First, the authoring software for implementing the data recording and reproducing method on the recording medium according to the present invention is mounted on the hard disk 10 in the PC 100. The authentication software is educational software. Or as part of an application software on a CD-ROM title or as a separate application program.

In this state, when the user inserts the optical disk 26 into the optical disk drive device 200 (S10), the optical disk drive device 200 inserts a recordable optical disk (CD-R or CD). -RW) confirms whether or not the blank disk has no data recorded at all or whether or not the password is recorded on the recordable optical disk (S11), and the verification result is mounted on the hard disk 10 to perform the central processing. Report to the authentication software executed by the device 11.

Accordingly, when the authentication software is reported as the optical disk 26 is a blank disk or a disk for which no password is recorded, the CPU 11 enters the password of the user by the next execution of the authentication software. A dialog box requesting (S12) is output on the monitor 13 via the video adapter 12.

Therefore, the user inputs a unique password (S20), and the CPU 11 constructs a packet command according to the ATAPI protocol by using the input password and an opcode for password recognition, and the packet command is It is transmitted to the optical disk drive device 200 via the counterpart ATAPI interface 21 (S21). The opcode for password recognition is not defined as a packet command of ATAPI so far as shown in FIG. 4A. A value of 36h is used, and a field indicating the password and the length of the password is configured as shown in FIG. 4B at the end of the opcode to be transmitted through the ATA bus.

Accordingly, the ATAPI interface unit 21 of the optical disk drive device 200 receives the transmitted packet command, and the microcomputer 32 transmits the password from the opcode 36h in the received packet command. By recognizing that the command is a password, the password in the command is recorded in a specific area of the optical disc 26, for example, a file system area located at the head of the data area in the disk or session of FIG.

To this end, the microcomputer 32 copies the password several times to form a block of a predetermined size and transmits the same to the digital recording signal processing unit 23. The digital recording signal processing unit 23 records / reproduces the password block. An error correction code block (ECC Block) is generated by adding an error correction parity for reliability, and the channel bit encoder 24 outputs the digital bit stream output from the digital recording signal processor 23 to an optical disc. A pulse width modulated signal for recording at 26 is converted and applied to the optical driver 25. The microcomputer 32 previously located the pickup unit 27 in the file system recording area through the servo unit 30, and then outputs the recording signal by the optimal optical driving current. The optical driver 25 applies the signal of the optical drive power to the pickup unit 27 so that the signal of the pulse width modulated password block is recorded in the file system of the optical disk 26. The recording is made in the area (S22), and the microcomputer 32 also stores this recorded password.

When the password is recorded on the optical disk 26 in this way, and then the image or the plain text data is input through the ATAPI interface 21 for recording on the optical disk 26, the encoder 22 enters the input. Data is encoded in a predetermined manner, which will be described in more detail as follows. If the recorded password is 'ABCDEFGHIJ', the encoder 22 makes an encryption function using the first three digits 'ABC' as a parameter, and the remaining seven digits 'DEFGHIJ' is a parameter of the encryption function. I use it.

For example, A higher order equation is generated in the encoder 22, and the encoder 22 encrypts the data input using the higher order equation generated from the user's password. Thus, the encryption process is performed by a single predetermined method. Instead of being performed, an encryption process is performed in different ways by the input user password, and the encrypted data is recorded in the data area on the optical disc 26 by the pickup unit 27 through the above-described process. (S23).

As described above, the recording of the encrypted data by the user password recorded on the optical disc 26 is continued until the end of the recording stop request or the recording request data of the user.

Subsequently, when the optical disk 26 is inserted into the optical disk driving apparatus 200 and a play request S30 is input, first, the microcomputer 32 is a disk on which the optical disk 26 can record a password. That is, it checks whether or not the disc is recordable (S31) and reports the result of the check to the CPU 11 through the ATAPI interface unit 21. Accordingly, when the central processing unit 11 determines that the optical disk 26 is a recordable optical disk, the central processing unit 11 displays a dialog box for requesting input of a user's password (S32) by the currently executing authentication software. It outputs on the monitor 13 through 12).

The user inputs a unique password through a dialog box on the monitor 13 (S40), and according to the input of the user password, the central processing unit 11 enters the microcomputer 32 of the optical disk drive unit 200, The transfer of the password recorded on the optical disk 26 is requested, so that the microcomputer 32 reads the password which has been repeatedly recorded several times on the file system recording area of the optical disk 26 so that the same can be read. After determining whether the predetermined number or more is the same, the password is transmitted to the CPU 11 through the ATAPI interface unit 21.

The running authentication software compares the input user password with the password read out from the optical disk 26 (S41) to determine whether the two passwords are the same (S50), and the CPU 11 Only when it is determined that the passwords are the same, the reproduction command of the optical disc 26 and the user password are transmitted back to the optical disc driving apparatus 200 through the ATAPI interface unit 14 (S51). .

Accordingly, the microcomputer 32 of the optical disc drive apparatus 200 transmits the user password received together with the playback command to the decoder 33 according to the playback command received through the ATAPI interface unit 21. On the other hand, the pickup section 27 is controlled to read recording data on the optical disk 26 which is rotationally driven.

The high frequency reproduction signal read out and reproduced from the rotationally driven optical disk 26 by the pickup unit 27 is filtered by the R / F unit 28, and then digitally processed by the digital signal processing unit 30. The decoder 33 restores the bitstream to the EFM inverse transformed digital data, and the decoder 33 decodes the converted digital data, wherein the decoder 33 uses the user password set by the microcomputer 32. By generating the inverse equation of the encryption equation and performing the data decryption process based thereon, the normal reproduction (S52) of the recording data on the optical disc 26 is performed.

In the method of recording and reproducing data on a recording medium according to the present invention, the password set by the user is recorded on the recording medium, and the user enters the password when the recording medium is driven, so that only a legitimate user can record the recording medium. It is a useful invention to enable the recording medium to be driven such as reproduction, thereby excluding the case where important information on the recording medium is exposed to another person or the information on the recording medium is lost by another person.

Claims (4)

A first step of checking a recording state of the inserted recording medium; A second step of requesting input of a user's password according to the verification result; And And a third step of recording the input password in a specific area on the recording medium. The method of claim 1, And encrypting data input from the outside using the recorded password, and then recording the data onto the recording medium. The method of claim 1, And the specific area is a file system recording area on the recording medium. A first step of requesting input of a user's password when a reproduction request of the inserted recording medium is requested; A second step of comparing the input password with a password recorded on the recording medium; And And a third step of decrypting and reproducing the data recorded on the recording medium using the input password according to the comparison result.