JP2004119009A - Data recording medium and information data writing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To substantially prohibit copy even when all data of an optical disk is copied. <P>SOLUTION: A medium ID signal DMi and copy control information CGM are recorded as TOC data in an optical disk 2 to be reproduced. When this medium ID signal DMi indicates that the disk is recordable and the copy control information CGM indicates prohibition of copy, a reproduction prohibiting signal PBINH is made "1". Thereby, a switch circuit 31 is controlled, reproduction data are not outputted, and error message data are outputted. Copy can be prohibited substantially by this reproduction prohibiting operation. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a data recording medium and an information data writing device capable of restricting copying of data recorded on a data recording medium, for example, an optical disk.

2. Description of the Related Art As an external storage device of a computer, an optical disk drive has attracted attention because of its advantages of large capacity and high-speed access. A CD-ROM (or CD-I (CD Interactive)) drive and a magneto-optical disk, which is one of erasable disks, have been already used ) Drive adoption is rapidly expanding. Other than these, an MD (mini-disc; erasable disc) having a disc diameter of 2.5 inches has also been proposed. Further, a DVD (digital video disk) is being developed as a video storage medium.

A DVD is a read-only disk having the same diameter as a CD, or a recordable / reproducible optical disk such as an MO disk or a phase-change disk, and a disk capable of reproducing or recording / reproducing video information compressed by MPEG or the like. It is. In DVDs, the recording density has been further improved by the progress of shortening the wavelength of the laser beam and the NA of the objective lens, and the processing of digital modulation and error correction coding has been further improved. The data storage capacity is enormous, about 3.7 Gbytes. Just as CDs and MDs were initially developed as digital audio discs and later used as external storage media for computers, larger capacity DVDs are expected to be used as external storage media for computers. ing.

Conventionally, when it is necessary to prohibit copying of data recorded on such a data recording medium, a copy protection signal is recorded on the medium, and the copy protection signal is recognized by the drive or the host computer, Protected against copying operations.

However, such a conventional copy management method has a problem that copying cannot be prohibited when all data on the medium is dump copied. For example, all data reproduced from a recording medium is temporarily stored in a hard disk, and all data in the hard disk is recorded on the recording medium as simple `0`` 1` data. In this case, the control data in the reproduction data is treated as having no meaning. In addition, in the case of creating data that can be protected for each sector, it is necessary to identify a protect and rewrite a copy protect signal in a copy operation of a portion that can be copied, which requires a lot of processing time. Occurs.

Therefore, an object of the present invention is to make it impossible to reproduce a medium even when all data on the medium is dump-copied, and to more reliably copy-protect data recorded on the medium. It is an object of the present invention to provide a data recording medium and an information data writing device capable of performing the above.

In order to achieve the above object, according to the present invention, medium information and copy management information are recorded together with digital data, and the medium information identifies read-only and writable, and the copy management information Identify prohibited and copyable,
A data recording medium characterized in that a recording area for recording recording data and accompanying copy management information is separately provided from a recording area for recording copy management information set by a user.

Further, the present invention provides a data writing device for writing non-erasable information data in a read-only area of a recording medium having a read-only area,
Generating means for generating medium information indicating that the read-only area of the recording medium is read-only, and copy management information;
Writing means for non-erasably writing information data, medium information and copy management information in a read-only area,
The medium information is an information data writing device that generates reproduction prohibition information for prohibiting reproduction of information data based on the medium information itself and the copy management information when reproducing the information data.

(4) By combining the medium information and the copy management information, even when all the data has been copied, the reproduction operation can be prohibited, and the copying can be substantially prohibited.

According to the present invention, the copy can be substantially prohibited by combining the medium information and the copy management information so that even if all the data is copied, the reproduction is impossible. In particular, when the present invention is applied to a recordable large-capacity disc such as a DVD, there is an advantage that the copy of computer data such as video software and programs can be satisfactorily restricted.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an optical disk recording system according to the present invention, and FIG. 2 shows an optical disk reproducing system. In the recording system, recording data is supplied from an input terminal 1 and recorded on an optical disk 2. The recording data is compressed video data, compressed audio data, computer data, and the like. A currently recordable type of DVD (a magneto-optical type or a phase change type) is an example of the optical disk 2. The recordable optical disk 2 is called a RAM-type. That is, the RAM type disk is an erasable disk or a WO disk. The WO disk can be recorded only once and cannot be recorded / reproduced many times in a strict sense, but is here included in one of the RAM types for simplicity.

The recording system shown in FIG. 1 is applicable not only to the recordable optical disc 2 but also to a mastering system for a read-only disc (referred to as a ROM type). Further, the present invention can be applied to a hybrid disc (also called a multi-session disc) in which a data area of one optical disc is divided into a recordable area and a read-only area.

Here, the data structure of the recording data to which the present invention can be applied, in particular, the data unit for access (recording or reproduction) will be described. A CD-ROM, which is an example of a read-only disk, has been developed from a well-known CD (Digital Audio Disk DAD). As shown in FIG. 3, the CD includes a 1-byte subcode, 24 bytes of data, and 4 bytes of C1 parity and C2 parity in a transmission frame (also referred to as an EFM frame or a C1 frame). It is arranged. On the CD, each byte is converted into a 14-channel bit code word by EFM modulation, and is recorded via combined bits (3 channel bits). Further, at the beginning of each transmission frame, an inversion interval of 11T (T is a cycle of a channel bit) continues, and thereafter, a sync (meaning a synchronization signal) of a total of 24 channel bits in which two channel bits are added is added. Is done.

The subcode is configured to be one unit with a period of 98 transmission frames. Therefore, in CD-DA, within 98 transmission frames,
24 bytes × 98 = 2352 bytes of user data are included.

The data structure of the CD-ROM is defined based on the transmission format of the CD. That is, the CD-ROM uses 2352 bytes, which is data included in 98 frames of the subcode cycle, as an access unit. This access unit is also called a block, but will be called a sector in the following description. FIG. 4 shows a data structure of one sector of the CD-ROM.

In the CD-ROM, mode 0, mode 1, and mode 2 are defined. A sync (12 bytes) indicating a sector delimiter and a header (4 bytes) are added in common to these modes. In mode 0, data other than these syncs and headers are all "0", and are used as dummy data. FIG. 4 shows the data structure of one sector in mode 1 and mode 2. The header is composed of 3-byte address information and 1-byte mode information similar to the subcode of the CD.

In the data structure of Mode 1, the user data is 2,048 (2K) bytes, and 288 bytes of auxiliary data are added to increase the error correction capability. That is, an error detection code (4 bytes), a space (corresponding to 8 bytes), a P parity (172 bytes), and a Q parity (104 bytes) are added. Mode 1 is suitable for recording data that requires high reliability, such as character codes and computer data. Mode 2 is a mode in which 288 bytes of auxiliary data are not added, and therefore, 2,336 bytes of user data can be recorded. Mode 2 is suitable for recording data such as video data and audio data that can interpolate errors.

ＣＤ Further, CD-I is standardized as a ROM-type similar to the CD-ROM. FIG. 5 shows the data structure of one sector of the CD-I. As with the CD-ROM, a 12-byte sync and a 4-byte header are added, and the mode information in the header is set to mode 2. In the CD-I, an 8-byte subheader is added after 4 bytes. The subheader includes a 2-byte file number, a channel number, a submode, and a data type.

フ ォ ー ム Furthermore, similarly to the mode 1 and the mode 2 of the CD-ROM, the forms 1 and 2 are defined in the CD-I. In Form 1, an error detection code of 4 bytes, a P parity of 172 bytes, and a Q parity of 104 bytes are added. Since no space is provided in mode 1 of the CD-ROM, the user data area is 2,048 bytes. In the form 2, a reserved area (corresponding to 4 bytes) is provided, and an area for user data is 2,324 bytes.

Next, in a case where the recording data is supplied from a computer, FIG. 6A shows a data structure of one sector when the recording data is recorded on the optical disk 2. A data sync (4 bytes) and a header (16 bytes) are added to 2,048 bytes of user data of one sector, and an error detection code EDC (4 bytes) for improving reliability is added. You. Therefore, the length of one sector is 2,072 bytes.

On the other hand, since the user data of the above-described CD-ROM, for example, in mode 2 is 2,336 bytes, as shown in FIG. 6B, a data sync (4 bytes) and a header (16 bytes) are added, and The detection code EDC is added, and the header (4 bytes) of the CD-ROM is stored. In this case, the size of the user data may be handled as 2,340 bytes without storing the header of the CD-ROM. Therefore, the length of one sector is 2,368 bytes. Preferably, the data sink and the header and the error detection code EDC use a common one among the data shown in FIGS. 6A and 6B, respectively.

に Thus, the length of one sector is different, and of course, there is no relationship of the integer ratio. In this embodiment, when two different sector sizes are A and B, nA and mB (where n and m are integers and n ≠ m and n> m) are data units of a predetermined size. (Referred to as a block). Then, data is recorded / reproduced (that is, accessed) in units of blocks. There are two methods for defining n and m: a method of considering m = n-1 and a method of setting n = 2j (j is a natural number). The method of defining m = n-1 is adopted when the block size is minimized. The method of defining n = 2j is adopted when considering the affinity with the computer system.

In the above example, considering only user data, if n = 8 and m = 7 are defined,
2048 bytes × 8 = 16,384 bytes 2336 bytes × 7 = 16,352 bytes, which fits in a block of 16 Kbytes (16,384) bytes.

Further, as shown in FIG. 6 described above, when a sector size obtained by adding a total of 20 bytes of a data sink and a header is considered as A '= 2,072 and B' = 2,368, n = 8 , M = 7, and the block size is
2,072 × 8 = 2,368 × 7 = 16,576 bytes, which can define the same common block size.

As shown in FIG. 7, a two-dimensional array of (148 × 112 = 16,576 bytes) is defined as a data structure of one block in this case, and an error correction code is applied to the two-dimensional array. , The error correction capability can be increased. As the error correction code, the first error correction code (referred to as C1 code) is coded for 162 bytes in the vertical direction (each column), C1 parity is generated for 8 bytes, and 156 bytes in the diagonal direction are generated. Convolutional double encoding, in which a byte is encoded with a second error correction code (referred to as C2 code) and a 14-byte C2 parity is added, can be employed.

Of course, as the error correction code, in addition to this, a product code, a block complete type double coding, an LDC (Long Distance Code), or the like may be adopted, and coding using a simple error detection code is also possible. It is.

A case where two different size sectors are integrated into the same size block will be described more specifically with reference to FIG. FIG. 8A shows processing of the sector size in the case of 2,072 bytes shown in FIG. 6A. This one sector is divided into 148 bytes in the R / W direction to form a two-dimensional array of 148 × 14 = 2,072 bytes. Therefore, one sector in this array is included in one block, and a data structure in which one block has eight sectors is formed.

FIG. 8B shows processing of the sector size in the case of 2,368 bytes shown in FIG. 6B. This one sector is divided into 148 bytes in the R / W direction to form a two-dimensional array of 148 × 16 = 2,368 bytes. Therefore, one sector in this array is included in one block, and a data structure of seven sectors in one block is formed. At the time of recording / reproduction, a counter for counting 2,072 bytes or 2,368 bytes of data is provided, and a block break is determined by detecting seven or eight sector syncs. Not limited to this method, a block sync different from a sector sync may be added.

According to the present invention, data having a structure in the case of CD-DA (Digital Audio) can be formed into a block structure having a common size. In the case of CD-DA, 2,352 bytes of user data are included in a 98 transmission frame. As shown in FIG. 9, a 4-byte data sync and a 12-byte header are added to the user data, so that the size of one sector can be 2,368 bytes. Therefore, similarly to the above-described CD-ROM sector, seven CD-DA sectors are included in one block.

Returning to FIG. 1, a recording system according to an embodiment of the present invention will be described. Digital data from the input terminal 1 is supplied to the formatting circuits 4a and 4b via the interface 3, for example, SCSI. These formatting circuits 4a and 4b divide the received digital data into sectors, add a data sync and a header, and perform error detection encoding. That is, when the received data is in units of 2 Kbytes, the formatting circuit 4a converts the data into a sector structure having a size of 2,072 bytes as shown in FIG. 6A, and the formatting circuit 4b receives the data. When the data is reproduction data of a CD-ROM, the data is converted into a ROM-type (2,368-byte size) sector structure as shown in FIG. 6B.

The output data of the formatting circuits 4a and 4b is selected by the switch circuit 5 and supplied to the blocking circuit 6. The switch circuit 5 is controlled by a format identification signal output from the interface 3, and the switch circuit 5 is switched according to data received by the interface 3. When the received data is in units of 2 Kbytes, the switch circuit 5 selects the output of the formatting circuit 4a, and when the received data is data reproduced from a CD-ROM, the switching circuit 5 selects the output of the formatting circuit 4a. 4b is selected.

(4) Further, as described later, the medium ID signal DMi and the copy management information CGM are supplied to the TOC generation circuit 7, and TOC data including the information is generated. The TOC (Table Of Contents) data includes disc control information, directory information, and the like, and is, for example, data recorded on the innermost track, and is read when the disc is mounted on the drive. In this case, since the medium ID signal DMi is specific to the type of the medium, it is preferable to preformat the medium ID signal as a part of the TOC data of the medium. As a preformatting method, a known method, for example, a method of forming an emboss can be adopted.

The blocking circuit 6 receiving the output of the switch circuit 5 forms a block composed of 7 sectors or 8 sectors and encodes an error correction code for each block. Data from the blocking circuit 6 is supplied to an error correction code encoder 8. The encoder 8 encodes, for example, a convolutional double-encoding error correction code. This error correction coding is similar to that used in CDs. That is, data symbols are included in two coded sequences called C1 and C2 codes doubly, and an interleave process is performed so that each code sequence is composed of different data symbols.

The error correction code may be switched according to the type of the disk 2 using the medium ID signal DMi. For example, a RAM-type disk employs block-completed double encoding, and a ROM-type disk employs convolutional double encoding. As another method, in the case of the RAM type, there is a method in which the interleave length of the double encoding is shorter than that of the ROM type.

The output of the encoder 8 for error correction encoding is supplied to the switching circuit 9. The switching circuit 9 switches between the error correction coded output and the TOC data from the TOC generation circuit 7 and outputs the same to the digital modulation circuit 10. The digital modulation circuit 10 generates a modulation output with a small DC component, for example, by mapping a 1-byte (8-bit) data symbol to a 16-bit code word according to a predetermined table. Of course, EFM on a CD, 8-15 modulation for converting an 8-bit data symbol into a 15-bit codeword, and the like can be adopted as digital modulation. The output of the digital modulation circuit 10 is supplied to the sink addition circuit 11.

(4) In the sink adding circuit 11, a predetermined sync is added. For example, a C1 code sequence consisting of 170 data symbols generated in the error correction encoder 8 is divided into 85 data symbols, and a result of 8-16 modulation of the 85 data symbols is defined as one transmission frame. Frame sync is added. Further, a sector sync is added instead of a frame sync for each sector, and a block sync is added instead of a sector sync for each block. As these sinks, for example, those having a unique bit pattern which is 32 channel bits long and does not appear in the modulated data are used. The output of the sink addition circuit 11 is supplied to the optical pickup 13 via the driver 12, and is recorded on the optical disk 2 by magneto-optical recording or phase change. The optical disc 2 is rotated by a spindle motor 14 at CLV (constant linear velocity) or CAV (constant angular velocity). The minimum unit of data recorded / reproduced by the optical pickup 13 is one block described above.

In one embodiment of the present invention, a medium ID signal DMi recorded as TOC data is defined, for example, as follows.
Medium ID signal DMi (2 bits of a and b)
a = 0, b = 0; ROM-type (for example, when the optical disk 2 is a CD-ROM master disk)
a = 0, b = 1; unused a = 1, b = 0; RAM-type (WO)
a = 1, b = 1; RAM-type (erasable) (for example, when the optical disc 2 is a DVD erasable type)

The copy management information CGM is defined as follows.
Copy management information CGM (2 bits of c and d)
c = 0, d = 0; copy free c = 0, d = 1; unused c = 1, d = 0; one-generation copy possible c = 1, d = 1; copy prohibited

(4) A reproduction circuit of the optical disk 2 on which data is recorded as described above will be described with reference to FIG. The optical disk 2 is a RAM-type or a ROM-type, and the identification of this medium is possible by the medium ID signal DMi in the TOC data. In FIG. 2, the same reference numerals as those of the optical disc 2, the optical pickup 3, the spindle motor 13 and the recording circuit (FIG. 1) are used, but this is because recording and reproduction are performed by the same apparatus. Does not mean In particular, in the case of the ROM type, the recording device in FIG. 1 is a mastering system, and the reproducing device in FIG. 2 is a ROM drive.

(4) The reproduction data read by the optical pickup 13 is supplied to the clock extraction PLL circuit 22 via the RF amplifier 21. Although not shown, a servo control circuit is provided on the recording side and the reproducing side to control focus servo, tracking servo, feed operation (seek) of the optical pickup 13, laser power control during recording, and the like. . The output data of the PLL circuit 22 is supplied to a sync separation circuit 23, and a sync detection signal corresponding to each of the frame sync, the sector sync, and the block sync is generated from the sync separation circuit 23. Although not shown, these sync detection signals are supplied to a timing generation circuit, and various timing signals such as a sector cycle and a block cycle synchronized with the reproduction data are generated.

The digital demodulation circuit 24 is connected to the sync separation circuit 23. The demodulation circuit 24 generates data in which a code word is converted back to a data symbol by the reverse process of the digital modulation circuit 10. The output data of the digital demodulation circuit 24 is supplied to the TOC separation circuit 25. The TOC separation circuit 25 sends the TOC data read at the time of loading the disc to the TOC decoder 26. The TOC data is decoded by the TOC decoder 26, and various directory information and control information are obtained. The medium ID signal DMi and copy management information CGM are also obtained from the reproduced TOC data.

The reproduced data passed through the #TOC separation circuit 25 is supplied to an error correction code decoder 27. The decoder 27 performs error correction of the reproduced data. The error-corrected data from the decoder 27 is supplied to the block decomposition circuit 28. In the block decomposition circuit 28, the reproduction data is divided into blocks, and the error correction codes of the blocks are decoded. The processing that is the reverse of the processing of the recording-side blocking circuit 6 is performed by the block decomposition circuit 28, and the data having the sector structure is output by the block decomposition circuit 28. The format decomposition circuits 29a and 29b are connected to the block decomposition circuit 28. Outputs of the format decomposition circuits 29a and 29b are selected by the switch circuit 30.

The format decomposing circuit 29a performs a process reverse to that of the recording-side formatting circuit 4a, and the format decomposing circuit 29b performs a process opposite to the processing of the formatting circuit 4b. The format decomposing circuit 29a extracts 2,048 bytes of user data from the sector of the RAM-type optical disk shown in FIG. 6A and detects an error. The format decomposing circuit 29b cuts out 2,336 bytes of user data from the sector of the ROM type optical disc shown in FIG. 6B, and detects an error.

One of the user data cut out by the format decomposing circuits 29a and 29b is selected by the switch circuit 30 and supplied to the switch circuit 31. The data selected by the switch circuit 31 is supplied to the interface 32, and the reproduction data is taken out from the interface 32 to the output terminal 33. The switch circuit 30 is controlled by the header information detected by the block disassembly circuit 28, and selects the output of the circuit 29a or the output of the circuit 29b that performs processing corresponding to the sector structure of the actually reproduced data.

The switch circuit 31 is controlled by the reproduction inhibition signal PBINH from the TOC decoder 26. One input terminal of the switch circuit 31 is supplied with the reproduction data selected by the preceding switch circuit 30, and the other input terminal is supplied with error message data. The reproduction inhibition signal PBINH is generated based on both the medium ID signal DMi and the copy management information CGM. That is, the AND output (acd) of the bit “a” of the medium ID signal DMi and the bits “c” and “d” of the copy management information CGM is used as the reproduction inhibition signal PBINH. That is, when PBINH = (a · c · d) = “1”, the reproduction inhibition operation is performed, and the switch circuit 31 selects the error message data. If PBINH = "0", the reproduction operation is not prohibited.

When the reproduction inhibition signal PBINH is "1", the switch circuit 31 outputs error message data via the interface 32, so that the computer connected to the output terminal 33 decodes this error message and outputs it to the display. Displays a message that playback is not possible due to a copy-protected disc. If necessary, the optical disc 2 may be brought into a standby state such as returning the position of the optical pickup 13 to the initial position by the reproduction prohibition signal PBINH, or the optical disk 2 may be reproduced, but normal data may not be output. In this manner, the operation of substantially inhibiting the reproduction output is performed.

The combination in which the reproduction prohibition signal PBINH becomes “1” and the reproduction operation is prohibited is that the medium ID signal DMi is (10) (that is, WO disk) or (11) (erasable disk) and the copy management information CGM is (11) (that is, copy prohibition). Therefore, when the copy management information CGM of the data recorded on the optical disk 2 is copy-prohibited, the reproduction prohibition signal PBINH always becomes "1", and reproduction becomes impossible.

For example, even if the optical disc 2 to be reproduced is a copy of all data including the TOC of which the medium ID signal DMi is (00) (that is, a ROM-type disc), the medium of the optical disc on which the copied information is recorded Since the ID signal DMi is (10) or (11), as described above, reproduction becomes impossible, and copying can be substantially prohibited. When the optical disk 2 is a ROM-type, copying can be performed by connecting another optical disk recording device to the output terminal 33. However, if the copy-inhibited management information is recorded on the optical disk 2, for example, Even if copying is possible, as described above, this optical disc cannot be reproduced, and copying can be substantially prohibited.

FIG. 10 shows the configuration on the recording side of a simpler embodiment of the present invention. The format of the recording data supplied to the interface 3 is only one. For example, it receives reproduction data from a CD-ROM, performs the same data format and the same digital modulation as the CD-ROM, and records it on a RAM-type optical disk 2 (CD-WO or CD-RAM). In another example, data reproduced from a DVD-ROM is recorded on a DVD-RAM. Therefore, the formatting circuits 4a and 4b, the switching circuit 5, and the blocking circuit 6 in the above-described embodiment (FIG. 1) are omitted. 10, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 11 shows a configuration on the reproduction side corresponding to the configuration on the recording side in FIG. As in the above-described embodiment, the reproduction inhibition signal PBINH is generated from the medium ID signal DMi indicating the type of the medium on the disk 2 and the copy management information CGMS. By the reproduction prohibition signal PBINH, if the DMi of the reproduced disk 2 is (10) or (11) and the CGMS is (11), the reproduction output is substantially prohibited. The block decomposition circuit 28, the format decomposition circuits 29a and 29b, and the switch circuit 30 in the above-described embodiment (FIG. 2) are omitted. 11, portions corresponding to those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

Note that the number of bits of the copy management information CGM may be set to more than 2 bits to set more detailed copy management information. In the above-described embodiment, the medium ID signal and the copy management information are recorded as the TOC data including the directory information. However, the medium ID signal and / or the copy management information may be recorded for each sector. As a result, it is possible to manage copy in sector units. Further, in a case where the present invention is applied to a hybrid disc (also called a multi-session disc) in which a part of the recording area of one disc is a RAM-type and the other part is a ROM type, at least It is necessary to record a medium ID signal and copy management information corresponding to the area.

Further, when it is desired to create a data recording medium of the RAM-type and copy prohibition, an area for recording the copy management information for the RAM-type in an area different from the area for recording the data for the ROM-type. , And copy management information (copy prohibition) set by the user can be recorded therein. As a result, the present invention can be uniformly applied to RAM-type and ROM-type data recording media.

The present invention is not limited to the one in which the block structure of the same size is defined between the ROM-type and the RAM-type optical disks as in the above-described embodiment. That is, the data structure (for example, the sector structure) of the ROM-type and the RAM-type may be the same, or may be defined independently of each other. Further, the present invention can be applied not only to a disk-shaped recording medium but also to a case where a large-capacity semiconductor memory or a magnetic tape is used as a data recording medium.

FIG. 3 is a block diagram of an embodiment of a recording circuit according to the present invention. FIG. 3 is a block diagram of an embodiment of a reproducing circuit according to the present invention. FIG. 9 is a schematic diagram illustrating a data structure of a conventional CD. FIG. 9 is a schematic diagram illustrating a data structure of a conventional CD-ROM. FIG. 11 is a schematic diagram illustrating a data structure of a conventional CD-I. FIG. 4 is a schematic diagram illustrating an example of two data structures of a sector according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a data structure of a block according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a relationship between a sector and a block according to an embodiment of the present invention. FIG. 14 is a schematic diagram illustrating another example of a data structure of a sector in one embodiment of the present invention. FIG. 9 is a block diagram of another embodiment of the recording circuit according to the present invention. FIG. 10 is a block diagram of another embodiment of the reproducing circuit according to the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Recording data input terminals 2 and 3 Optical discs 4a and 4b Formatting circuit 5 Switch circuit 7 TOC data generation circuit 8 Encoder for error correction code 26 TOC separation circuit 30 Switch circuit 31 Switch circuit

Claims (2)

Medium information and copy management information are recorded together with the digital data, the medium information is for identifying read-only and writable, and the copy management information is for identifying copy-prohibited and copy-enabled. ,
A data recording medium, wherein a recording area for recording the copy management information accompanying the recording data and a recording area for recording the copy management information set by the user are separately provided. In a data writing device for writing non-erasable information data in the read-only area of a recording medium having a read-only area,
Generating means for generating medium information indicating that the read-only area of the recording medium is read-only, and copy management information;
Writing means for writing the information data, the medium information and the copy management information in the read-only area in a non-erasable manner,
An information data writing device, wherein the medium information generates reproduction inhibition information for inhibiting reproduction of the information data based on the medium information itself and the copy management information when reproducing the information data. .

Images