JP2001143386A - Recording method, manufacturing equipment for the recording medium, and device of recording or reproducing information as to the recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent data which are illegally duplicated to a recording medium from being reproduced. SOLUTION: The track of a recording medium is sectioned for every ECC block for error correction and data corresponding to L bytes are recorded in one ECC block with a recording mark 6 after 8/16 conversion to realize error data up to N bytes to be corrected in the one ECC block, which includes a prewrite area 5 wherein the 8/16-converted error data corresponding to M bytes are previously recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the prevention of normal reproduction of information illegally copied on a recording medium, and more particularly to a recording medium on which information is recorded by continuous recording marks, and a method for manufacturing the recording medium. The present invention relates to an apparatus and an apparatus for recording or reproducing information on the recording medium.

[0002]

2. Description of the Related Art As recording media for data processed by personal computers, game machines, and other information processing devices, D
VD (digital versatile dis)
c) is known. DVDs have a much larger recording capacity than CDs (compact discs) that have been conventionally used as recording media, and the spread of personal computers, home-use game devices, and the like, and the data processed by these devices. Demand has rapidly increased in recent years along with the increase in capacity.

[0003] There are a plurality of standards for DVD, and data recording is recorded only at the time of manufacture of the disc, and DVD-ROM (DVD-re
so-called write-once DVD-R (DVD)
-Recordable), a rewritable DVD-R / W (DV
D-R / W), a rewritable DVD-RAM (DVD-Rando) capable of rewriting data about 100,000 times
m Access Memory).

The distribution of data, including software, to information processing devices such as personal computers and game machines,
Since the data recorded at the time of manufacture cannot be changed, it is generally performed using a DVD-ROM.

[0005] Data distributed by using a DVD-ROM is a DVD-R, DVD-R /
W, DVD-RAM and the like can be illegally copied to a writable storage medium, and illegal copying of data contrary to the intention of the distributor has conventionally been a problem as it harms the rights of the distributor. ing.

FIGS. 12A, 12B and 12C respectively show a DVD-ROM, a DVD-R and a DVD-R /
FIG. 3 is a model diagram showing a track format of W, DVD-RAM.

As shown in FIGS. 12 (a), 12 (b) and 12 (c), the track of each recording medium has a Lead In area for recording medium identification information and a data area for recording data contents. have.

In a DVD-ROM, as shown in FIG. 12A, data is recorded by forming concavities and convexities called pits continuously by embossing in both the Lead In area and the data area. ing.

In a DVD-R and a DVD-R / W, as shown in FIG. 12B, a Lead In area and a data area are formed on a wobble track. In the Lead In area, identification information of the recording medium and the like are recorded in advance by irregularities called recording marks representing data. In the data area, LeadIn
Data is recorded by forming a recording mark in the same manner as in the area. The recording mark recorded in the data area is
As in the case of a DVD-ROM, data is recorded continuously. Also,
Data areas called land pre-pits are provided at predetermined intervals on the outer peripheral side of the track. In the land prepit, address information used when writing data to the data area is recorded.

In a DVD-RAM, as shown in FIG. 12C, a Lead is placed on a wobbled track.
An In region and a data region are formed. Lead
In the In area, identification information of a recording medium and the like are recorded in advance by forming concavities and convexities called pits by embossing. In the data area, DVD-R
As in the case of DVD-R / W, data is recorded by forming recording marks. However, the data area is physically partitioned for each sector by a partition called PID (Physical ID).

As described above, DVD-ROM, DVD-R
And DVD-R / W, data is continuously recorded in the data area.
D is physically separated and recorded. Therefore, DV
The data recorded on the D-ROM is transferred to a DVD-RAM
In the case of recording on a DVD-ROM, the signal processing process of recording data read continuously from the DVD-ROM in each sector of the DVD-RAM and recording it is complicated and time-consuming. On the other hand, when recording on a DVD-R and DVD-R / W, the data is continuously read from the DVD-ROM (Shif
t Reading) bit data is transferred by bit by
Since recording can be performed continuously in bits, DVD-
The contents recorded in the ROM can be read relatively easily on DVD-
R and DVD-R / W.

Therefore, there is a possibility that the distribution data recorded on the DVD-ROM is illegally copied to the DVD-R and the DVD-R / W.

In view of the above, the following measures have been taken to prevent illegal duplication of a DVD-R in which data can be written only once (write-once type). The measures for preventing unauthorized duplication are performed integrally by a DVD-R recording medium and a device for recording and reproducing DVD-R.

DV, which is the source of illegally copied data
The distribution data recorded on the D-ROM is encrypted (scrambled) in order to protect the data content from unauthorized duplication.
Often have been. As shown in FIG.
In the Lead In area of the VD-ROM, a recording medium
A medium identification area for recording information "DVD-ROM" indicating a VD-ROM, and an encryption key area for recording an encryption key for decoding data in an encrypted data area are provided. I have. When the data recorded in the data area of the DVD-ROM is normally reproduced, the data is reproduced while decrypting the data with the encryption key recorded in the encryption key area.

As shown in FIG. 13 (b), the DVD-R has a "DVD-R" indicating the DVD-R in the medium identification area.
R "is recorded. DVD-RO
Data irrelevant to the encryption key is prewritten by a recording mark (see FIG. 12 (b)) at a location corresponding to the M encryption key area at the time of manufacture. For this reason, DVD-RO
M data to DVD by Shift Reading
When the data is copied to -R, the data of the encryption key in the encryption key area is overwritten with data irrelevant to the prewritten encryption key. In the DVD-R, writing is valid only once, so that the recording mark indicating the data of the encryption key is integrated with the recording mark indicating the data irrelevant to the prewritten encryption key, and cannot be identified. Therefore, DVD-R
Even if the data area is read by any method, a correct encryption key cannot be obtained, so that the encrypted data recorded in the data area cannot be decrypted.

In a device capable of reading a DVD-ROM and a DVD-R, generation of illegally duplicated DVD-R data is prevented by the procedure shown in the flowchart of FIG.

First, the Lead In area of the recording medium is read, and the contents of the medium identification area and the encryption key area are stored (S1, hereinafter referred to as "S1"). Next, the recording medium is determined from the information recorded in the medium identification area. If the medium identification information indicates “DVD-ROM” (Y in S2,
es), the presence or absence of the wobbled track is checked (S3). If the wobbled track is detected (Yes in S3), the existence of the wobbled track in the DVD-ROM has some abnormality, and there is a possibility that the medium identification information “DVD-ROM” is false. Therefore, the processing ends without reproducing the data in the data area. If the wobbled track is not detected (No in S3), reading of the data area is started (S4), and it is checked whether the data recorded in the data area is encrypted data (S5). If the data is not encrypted (S
No in 5), the data in the data area is reproduced (S8).
If the data is encrypted (Yes in S5), the data is decrypted using the encryption key recorded in the encryption key area (S6). If the data has been decrypted normally (Yes in S7), the data in the data area is reproduced (S8). If decoding cannot be performed normally (N in S7)
o), end without reproducing the data in the data area.

If the medium identification information indicates "DVD-R" (No in S2: actually "confirm that the disc is a DVD-R"), the presence or absence of a wobbled track is checked (S9). ). If the wobbled track is not detected (No in S9), the process ends without reproducing the data in the data area because there is some abnormality in the recording medium.
If a wobbled track is detected (Y in S9)
es), reading of data in the data area is started (S1).
0), it is checked whether the data recorded in the data area is encrypted data (S11). If the data is encrypted (Yes in S11), the DVD-ROM
Since there is a possibility that the data related to the copyright such as the data recorded in the data area has been illegally copied, the processing is terminated without reproducing the data in the data area. If the data is not encrypted (No in S11), the electronic watermark (Wat
er Mark) is checked (S12). If there is a digital watermark (Yes in 12), DVD-RO
Since there is a possibility that the data related to the copyright such as the data recorded in M has been illegally copied, the process ends without reproducing the data in the data area. If there is no electronic watermark (No in S12), the data in the data area is reproduced (S8).

[0019]

As described above, in the conventional DVD-R recording medium and the reproducing apparatus capable of reading the DVD-ROM and DVD-R, the normal reproduction of the illegally copied data is performed. Playback is prevented.

However, in a conventional DVD-R recording medium and a reproducing apparatus capable of reading a DVD-ROM and a DVD-R, a DVD-R is used in the following method.
-It was possible to illegally reproduce a DVD-R in which the contents of the ROM were illegally duplicated.

The first method is to use the Lead I of DVD-R.
Incorrectly prewrite “DVD-ROM” in the medium identification area of the n area, or use a DV that does not perform prewrite.
After manufacturing the DR, the contents of the encryption key area and the data area of the Lead In area of the DVD-ROM are
By copying, it is copied to the encryption key area and data area of the DVD-R. When not performing prewrite, D
All of the VD-R LeadIn area and data area are copied. Such a DVD-R is reproduced using a reproducing apparatus modified so as not to detect a wobbled track.

The second method is to shift the contents of the medium identification area, encryption key area and data area of the LeadIn area of the DVD-ROM into the data area of the normal DVD-R.
Duplicate by Reading. Such DVD-R
Is reproduced by a reproducing apparatus modified so as to recognize the start position of the data area as the start position of the Lead In area without detecting the wobbled track.

As described above, there is a possibility that the countermeasures according to the prior art against the normal reproduction of a recording medium that has been illegally copied can be relatively easily disabled.

The present invention has been made in view of such circumstances, and a recording medium capable of effectively preventing normal reproduction of an illegally copied recording medium, an apparatus for manufacturing the recording medium, and An object of the present invention is to provide an apparatus for recording or reproducing information on or from this recording medium.

[0025]

According to the present invention, there is provided a recording medium for recording modulated data obtained by modulating byte data containing content data and an error correction code of the content data according to a predetermined modulation rule. A recording medium,
The recording medium includes a track, and the track includes
Each of the plurality of blocks includes at least one sector, and each of the plurality of blocks is configured to record modulated data corresponding to L-byte data. At least one of the plurality of blocks includes an irregular area in which modulated error data corresponding to M bytes of byte data is formed in advance, and is error-correctable or error-detectable by the error-correcting code. The upper limit of the number of bytes is N, and L, M, and N are values satisfying N <M <L, thereby achieving the above-described problem.

[0026] A predetermined track of the plurality of tracks may be provided with an identification area for recording identification data for identifying a type of a recording medium.

Each of the plurality of blocks is configured so that modulation corresponding to L-byte data is performed and encrypted data is recorded, and the identification area is modulated and And a key area for recording an encryption key used for decrypting the encrypted data.

[0028] The irregular area may be provided for each sector.

[0029] The irregular area may be provided in a partial area of the sector.

[0030] Each of the plurality of blocks may include the irregular region.

Each of the plurality of tracks may be of an additional recording type in which data once written is not erased, and predetermined data may be previously written in the irregular area. Each of the plurality of tracks may be a rewritable type in which data once written can be erased, and a predetermined pit row may be formed in the irregular area.

[0032] The predetermined data may be data modulated according to the modulation rule.

[0033] The predetermined data may be data not generated by the modulation according to the modulation rule.

A reproducing apparatus according to the present invention is a reproducing apparatus for reading data modulated according to the modulation rule from the above-mentioned recording medium, comprising: reading means for reading the modulated data; Demodulation means for demodulating the modulated data according to the inverse conversion of the modulation rule, and outputting the demodulated data as demodulated data; an irregular area detection means for detecting the position of the irregular area; Error removing means for removing the error data from the demodulated data based on the result; and error correcting means for using the error correction code to correct the error-removed data for each block using the error correcting code. And a reproducing means for reproducing the data corrected by the error correcting means, whereby the above-mentioned object is achieved.

A reproducing apparatus according to the present invention is a reproducing apparatus for reading the modulated data from a plurality of recording media including the above-described recording medium, wherein the reading means reads the modulated data; Demodulation means for demodulating the modulated data output from the demodulator according to the inverse conversion of the modulation rule, and outputting as demodulated data; and a type of recording medium based on the medium identification data output from the demodulation means. A medium identifying means for identifying, an anomalous area detecting means for detecting the position of the anomalous area, and, if the identification result by the medium identifying means is a predetermined medium, Error removing means for removing the error data from the demodulated data and outputting the same, and outputting the demodulated data as it is when the identification result is other than the predetermined medium; Using the error correction code, error correction means for correcting the data output from the error removal means for each block, and reproduction means for reproducing the data error-corrected by the error correction means, The error correcting means includes an uncorrectable detecting means for detecting the data for which the error cannot be corrected, thereby solving the above-mentioned problem.

[0036] A reproducing apparatus according to the present invention is a reproducing apparatus for reading the modulated and encrypted data from a plurality of recording media including the above-mentioned recording media, wherein the reading device reads the modulated data. Means, demodulation means for demodulating the modulated data output from the reading means in accordance with the inverse conversion of the modulation rule, and outputting the demodulated data as demodulated data. A medium identification unit for identifying the type of the recording medium based on the recording medium, an irregular region detection unit for detecting the position of the irregular region, and an irregular region detection unit when the identification result by the medium identification unit is a predetermined medium. The error data is removed from the demodulated data based on the detection result and output. If the identification result is other than the predetermined medium, the demodulated data is output as it is. An error removing unit that performs error correction on data output from the error removing unit for each block using the error correction code, and a case where the error corrected data is encrypted. The encrypted data is decrypted using the encryption key and output, and when the error-corrected data is not encrypted, the error-corrected data is output as it is. Decoding means, and reproducing means for reproducing data output from the decoding means, wherein the decoding means includes a decoding impossible detection means for detecting the data that cannot be decoded. Including
The error correcting means includes an uncorrectable detecting means for detecting the data for which the error cannot be corrected, whereby the above-mentioned object is achieved.

A recording apparatus according to the present invention is a recording apparatus for recording the content data on the above-mentioned recording medium, wherein for each predetermined byte of the content data to be recorded, the correction data which becomes the L byte together with the predetermined byte is provided. A code addition unit that adds and outputs a code, an irregular region detection unit that detects the position of the irregular region, and a modulation unit that modulates and outputs data output from the code addition unit according to the predetermined modulation rule. ,
Recording means for writing data output from the modulation means to the track, the modulation means adding a delay to the modulated data such that the recording means skips the irregular area and writes data. Including delay means,
This achieves the above-described problem.

An anomalous area forming apparatus according to the present invention is the anomalous area forming apparatus for forming the above-described anomalous area, wherein the position determining means for determining a position for forming the anomalous area is determined by the position determining means. Writing means for writing predetermined data at the position, whereby the above-mentioned object is achieved.

An anomalous area forming apparatus according to the present invention is an anomalous area forming apparatus for forming the above-mentioned anomalous area, wherein the position determining means for determining a position for forming the anomalous area is determined by the position determining means. And a processing means for forming a pit row at a position, whereby the above-mentioned object is achieved.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

According to the method for preventing normal reproduction of a recording medium illegally copied according to the present invention, an error correction code (ECC) recorded on a DVD-R or DVD-R / W is used.
(Recting code). The error correction code is DVD-R or DVD-R / W
Is used to correct or detect an error due to noise or the like generated when reproducing content data (content data, hereinafter also simply referred to as "data") recorded in the.

As shown in FIG. 1, the write-once recording medium of the present invention (hereinafter referred to as "DVD-R") has a plurality of wobbled concentric tracks 1. FIG. 2 shows a part of the innermost track 1 where data is read first. As shown in FIG. 2, the innermost track 1 includes a medium identification area 2a for recording identification information for identifying the type of the recording medium and a D.
A Lead In area 2 including an encryption key area 2b corresponding to an encryption key area (see FIG. 13A) of the VD-ROM;
And a data area 3 in which content data is recorded. Note that the track 1 other than the innermost track has only a data area 3 in which content data is recorded.
Also, as shown in FIG. 2, on the outer peripheral side of each track 1,
Land pre-pits 4 in which address information used when data is recorded on the track 1 are recorded are provided at predetermined intervals.

Data is recorded in the data area 3 of each track 1 by continuously forming recording marks 6 in which the data is modulated according to a predetermined modulation rule. As the type of modulation, for example, 8/16 conversion can be applied.

In the data area 3 of the DVD-R, data is recorded in units called ECC blocks composed of 16 sectors including error correction codes. In one sector, data corresponding to 2 Kbytes before 8/16 conversion according to the modulation rule is recorded. The ECC block is a unit for performing data error correction using an error correction code.

FIG. 3 is a configuration diagram of the ECC block.
As shown in FIG. 3, the ECC block includes 172 bytes (rows) × 192 bytes (columns) of content data,
It includes error correction codes provided in the row direction and the column direction of the content data. The error correction code provided in the column direction of the content data is 10 bytes (row) × 208
(Column) bytes, and an inner code (PI: inner)
-Code parity). content·
The error code provided in the data row direction is composed of 182 bytes (row) × 16 bytes (column), and the outer code (P
O: Outer-code parity).

As described above, by adding an error correction code to content data, even if an error occurs in content data due to noise or the like generated when reading the content data, the error can be corrected. Becomes possible. In addition, the error correction capability and the type of error suitable for error correction differ depending on what code is selected as the error correction code. The error correction code includes a hamming code and a BCH code (B
oose-Chaudhuri-Hocquenghem
code), and a Fire code, an Iwadare code, and the like suitable for correcting a burst error (an error that occurs in a locally hardened portion).

The recording medium according to the present invention uses RS (Reed)
-Solomon code is applied, and by using the characteristics of the error correction code, it is possible to prevent normal reproduction of a recording medium that is illegally copied. The present invention relates to a write-once recording medium (DVD)
-R) and a rewritable recording medium (DVD-R / W).
R) will be mainly described.

In the DVD-R, the recording mark 6 formed once cannot be erased. Therefore, when data is recorded on the track 1 where data is already recorded, the data is recorded on the continuous recording mark 6 already formed. , A new recording mark 6 is formed. For this reason, the previously formed recording mark 6 and the newly formed recording mark 6 overlap, and neither recording mark 6 can be read correctly.

As shown in FIG. 2, in the data area 3,
From the end of the data area 3 where data reading is started,
It is assumed that the above ECC block is divided every 16 sectors (hereinafter, referred to as “virtual ECC block”). As described later, the start position of each of the virtual ECC blocks is determined by the E when data in the data area 3 is actually read.
It does not always coincide with the start position of the CC block. However, the virtual ECC block is continuously located every 16 sectors (one sector is 2K bytes) from the start position of the data area 3, and FIG. 2 shows this virtual ECC block.

The ECC block using the RS code shown in FIG. 3 as an error correction code can correct up to 172 bytes (row) × 8 bytes (column) (1376 bytes) generated per ECC block. Yes, it is possible to detect errors up to 172 bytes (row) × 16 bytes (column) (2752 bytes).

In the DVD-R, at the stage of manufacturing, a pre-write area 5 is formed as an irregular area in which predetermined modulated error data has been written in advance. In one ECC block in which modulated data corresponding to L-byte data is recorded, a pre-write area 5 in which modulated error data corresponding to M bytes is previously written is provided. The upper limit of the number of bytes that can be corrected or detected by the error correction code in one ECC block is N bytes, and L, M, and N are integers that satisfy N <M <L. The prewrite area 5 is provided by forming a recording mark 6 by a device for creating a prewrite area. The error data to be written in the prewrite area 5 can be formed by modulating byte data, data corresponding to FFh or 00h, random data, identification data such as copyright, and the like. Further, the longest recording mark 6 obtained by the 8/16 conversion or data that is not generated by the 8/16 conversion may be formed. The sector in which the prewrite area 5 is formed in the ECC block (hereinafter, referred to as “prewrite sector”)
Is recorded in the land pits 4 provided on the outer peripheral side of the track 1 together with the address information used when writing data to the DVD-R.

Also, at the stage of manufacture, the identification data indicating the medium is stored in the medium identification area 2a, and the pre-write area 5 is written in the encryption key area 2b by the device for creating the prewrite area.
As with, data unrelated to the predetermined encryption key,
Each is recorded by a recording mark 6.

As described above, the D having the prewrite area 5
When data recorded on a DVD-ROM or the like is illegally copied to the VD-R by Shift Reading, as shown in FIGS.
The data of the D-ROM is stored in the pre-write area 5 of the data area 3
Is also overwritten.

The data overwritten on the pre-write area 5 of the DVD-R cannot be distinguished from the pre-written data, and the data is destroyed. With error correction code,
Even if an attempt is made to correct the error in the data in the virtual ECC block including the prewrite area 5, the error data included in one ECC block is M bytes, and exceeds N bytes that can be corrected by the error correction code. Can not do it. For this reason, Shift Readin
The data illegally copied by g cannot be error-corrected and cannot be reproduced normally.

To make it impossible to perform error correction using an error correction code, the prewrite area 5 for prewriting must be
An area equivalent to 376 bytes is sufficient for calculation, and an area equivalent to 2752 bytes may be used to make error detection impossible. However, when the pre-write area 5 is provided in sector units, the position of the pre-write area 5 can be specified in advance. Therefore, in order to surely disable error correction, the pre-write area 5 of two sectors per ECC block is required. Must be provided.

When data is normally recorded on the DVD-R, the address of the pre-written sector is read from the land pit 4 and the data is written while skipping the pre-write area 5. Conversely, when reading and reproducing data, the address of the pre-written sector is read from the land pit 4 and the data obtained by removing the error data read from the pre-write area 5 from the read data is reproduced. I do.

Although the case where the present invention is applied to the write-once recording medium (DVD-R) has been described above, the case where the present invention is applied to the rewritable recording medium (DVD-R / W) is almost the same. By embossing a member forming a medium to form a pit row, a prewrite area 5 in which modulated error data has been written in advance is formed.

According to the recording medium of the present invention configured as described above, bit by bi is performed as in the case of writing data to a conventional DVD-R or DVD-R / W.
When writing at t, the data written in the prewrite area 5 is destroyed. Since the data destroyed by the prewrite area 5 is included in the ECC block for error correction exceeding the number of bytes that can be corrected by the error correction code, the error cannot be corrected by the error correction. Therefore, it is possible to prevent data copied illegally on a recording medium from being normally reproduced.

FIG. 5A shows the pre-write area 5 on the DVD-R.
1 shows a configuration of a prewrite device (anomalous region forming device) for forming a pattern. The pre-write device for DVD-R forms a pre-write area 5 on each disk (recording medium) on which a land pre-pit 4 has already been formed, on which a recording film after replica has been formed. The land pre-pit 4 records the address of the land pre-pit 4 itself and the address after the address of the land pre-pit 4 indicating the position where the pre-write area 5 is formed.

As shown in FIG. 5A, the DVD-R pre-write device includes a land pre-pit signal reproducing means 41 for reproducing a signal recorded by the land pre-pit 4.
And a prewrite sector determining means 42 for determining a sector forming the prewrite area 5 based on a land prepit signal provided from the land prepit signal reproducing means 41.
A prewrite signal generation unit 43 for generating a prewrite formation signal for forming the prewrite area 5 based on the determination result of the prewrite sector determination unit 42; and a laser based on the prewrite formation signal given from the prewrite signal generation unit 43. Recording mark forming means 44 for generating a drive control signal for irradiating light; laser light irradiating means 45 for irradiating a laser beam to a disk based on a drive control signal provided from the record mark forming means 44; Control means 40 for controlling signal reproducing means 41 and the like
And

In the DVD-R pre-write device thus constructed, first, the land pre-pit signal reproducing means 41 reproduces the land pre-pit signal from the land pre-pit 4 based on the control signal from the control means 40. Then, it is given to the prewrite sector determination means 42. The prewrite sector determination means 42 acquires the address of the land prepit 4 and the address of the prewrite area 5 from the land prepit signal, and based on these addresses, the prewrite sector forming the prewrite area 5 and the data to be prewritten. And decide. The prewrite signal generation means 43 generates a prewrite formation signal for forming prewrite based on the address of the prewrite sector and the prewrite data provided from the prewrite sector determination means 42 and supplies the prewrite formation signal to the recording mark formation means 44. . The recording mark forming means 44 is provided with a laser light irradiating means 4 based on the prewrite signal.
A drive control signal for driving the laser beam 5 is generated and given to the laser beam irradiation means 45. The laser light irradiating means 45 irradiates the disk with laser light according to the drive control signal to form the recording mark 6 on the track 1.

In this way, the pre-write area 5 by the recording mark 6 is formed on the DVD-R at the position indicated by the address of the pre-write area 5 recorded in the land pre-pit 4.

FIG. 5B shows the configuration of a pre-write device (irregular region forming device) for forming a pre-write region 5 on a DVD-R / W. The DVD-R / W pre-write device uses land pre-pits 4 when creating a master disk (recording medium).
And the formation of the pre-write area 5. Also,
The DVD-R / W prewrite device forms a prewrite area 5 by providing a predetermined pit row in a sector. As shown in FIG. 5B, the pre-write device for DVD-R / W includes a land pre-pit forming means 56 and a laser beam irradiating means 59 for forming land pre-pits 4 on the outer peripheral side of the track 1 of the disc; Pit forming means 57 and laser light irradiating means 58 for forming
Address generation means 51 for generating an address on the DVD-R / W, prewrite sector determination means 53 for determining a sector forming the prewrite area 5 based on the address given from the address generation means 51, and prewrite sector determination The prewrite area 5 based on the determination result of the means 53
A pre-write signal generation means 55 for generating a pre-write formation signal for forming the data, a land pre-pit 4 is formed from an address given by the address generation means 51 and a pre-write sector address given from the pre-write sector determination means 53. Receiving a land pre-pit formation signal and a pre-write formation signal, and providing a land pre-pit formation signal to a land pre-pit formation means 56; It has a switching means 54 for providing a signal to the pit forming means 57, and a control means 50 for controlling the address generating means 51 and the switching means 54.

In the DVD-R / W pre-write device configured as described above, first, based on the control signal from the control unit 50, the address generation unit 51 causes the DVD-R / W
The address corresponding to the track 1 is generated, and the land pre-pit signal generation means 52 and the prewrite sector determination means 5
Give to 3.

The prewrite sector determination means 53 determines the address of the sector to be prewritten and the prewrite data to be prewritten from among the addresses given from the address generation means 51, and converts the address of the prewrite sector to the land prepit signal generation. To the means 52,
The address of the prewrite sector and the prewrite data are given to the prewrite signal generation means 55.

The prewrite signal generation means 55 generates a prewrite signal based on the address of the prewrite sector and the prewrite data.
A prewrite formation signal for forming the prewrite area 5 is generated and given to the switching means 54.

The land pre-pit signal generating means 52 determines an address for forming the land pre-pit 4 based on the address corresponding to the track 1 given from the address generating means 51. Further, the land pre-pit signal generation means 52 performs the land pre-pit formation performed by the land pre-pit formation means 56 based on the address for forming the land pre-pit 4 and the address of the pre-write sector given from the pre-write sector determination means 53 A land pre-pit forming signal for controlling the formation of
Give to.

The switching means 54 switches and outputs a land pre-pit formation signal and a prewrite formation signal based on a control signal given from the control means 50. The land pre-pit formation signal is sent to the land pre-pit formation means 5.
6 and the prewrite forming signal is provided to the pit forming means 57.

The land pre-pit forming means 56 generates a drive control signal for driving the laser light irradiating means 59 and gives it to the laser light irradiating means 59. Laser light irradiation means 59
Irradiates a laser beam to a disk in accordance with a drive control signal and forms land prepits 4 on the outer peripheral side of the track 1 based on a land prepit formation signal.

The pit forming means 57 generates a drive control signal for driving the laser light irradiating means 58 on the basis of the applied prewrite forming signal, and gives it to the laser light irradiating means 58. The laser light irradiating means 58 irradiates the disk with laser light in accordance with the drive control signal to form a pit row on the track 1.

The switching means 54 sequentially switches between the land pre-pit formation signal and the pre-write formation signal and outputs the signals to the land pre-pit formation means 56 and the pit formation means 57 so that the land pre-pit formation signal is recorded on the track 1 of the disk. Pits 4 and prewrite areas 5 are formed sequentially.

As described above, a pre-write area 5 from which erroneous data is read at the time of reading data is formed by a pit row in a predetermined sector of the track 1, and the land pre-pit 4 has an address of the land pre-pit 4 itself. And the address of the prewrite sector having the prewrite area 5 are recorded.

As the laser beam irradiating means 58 for forming a pit row, a laser oscillating means for oscillating an argon laser can be applied.

The above-described DVD-R and DVD-R / W of the present invention are written and read by the following recording / reproducing apparatus. Data is 8
A method of forming a recording mark on which a / 16 conversion is performed on a track 1 of a recording medium and a principle of reading the recording mark on the track 1 are based on conventional DVD-R and DVD-R /
It is the same as the W recording / reproducing apparatus.

FIG. 6 shows a DVD-R and a DVD of the present invention.
FIG. 3 is a configuration diagram of a recording / reproducing apparatus of -R / W. As shown in FIG. 6, in order to realize the recording function, the recording / reproducing apparatus 40 includes an input terminal 10 for inputting content data to be recorded on a recording medium, and an error in the content data input from the input terminal 10. Error correction code adding means 11 for adding an RS code as a correction code, and irregular area detecting means 12 for determining the position of a prewrite area 5 provided on a recording medium
Write data generating means 13 for outputting a pulse signal obtained by subjecting content data (byte data) to which an error correction code has been added to 8/16 conversion or the like, and a pulse signal output from write data generating means 13 8/1 based on
6. Writing / reading means 14 for recording the converted byte data as recording marks on a recording medium, and control means 15 for controlling the operations of the irregular area detecting means 12, writing data generating means 13, and writing / reading means 14.
And The writing / reading means 14
Are used as reading means in the reproduction function.

The writing / reading means 14 is a laser beam for writing the 8/16 converted byte data on the recording medium, or the 8/16 recorded on the recording medium.
The laser irradiation means 20 for irradiating the laser light for reading the converted byte data, and the recording mark 6 on the recording medium of the laser light irradiated from the laser irradiation means 20 (FIG. 2)
Laser receiving means 21 for receiving reflection by the land pre-pit 4 (see FIG. 2) and outputting an electric signal corresponding to the received light, and a laser driving means for irradiating an arbitrary laser light from the laser irradiating means 20. 9.

The irregular area detecting means 12 derives the land pre-pit 4 from the electric signal output from the laser light receiving means 21.
Signal separating means 23 for separating a signal based on the reflected laser light from the laser beam and a signal based on the reflected laser light from the recording mark 6, and a signal based on the reflected laser light from the land prepit 4 received from the signal separating means 23 And a land pre-pit signal reproducing means 24 for obtaining the address information of the land pre-pit 4 and the address of the pre-write area 5 (address of the pre-written sector).

The write data generation means 13 includes a write gate generation means 25 for generating a write gate based on the address information of the pre-written sector output from the land pre-pit signal reproduction means 24, The write data buffer means 26 receives byte data from the means 11 and outputs byte data at a timing based on the write gate output from the write gate generating means 25, and the byte data output from the write data buffer means 8/8. A recording pulse generating means 27 for providing a laser driving means with a control pulse signal for irradiating the laser light from the laser light irradiating means 7 for forming the 16 converted recording marks 6 on the recording medium.

The recording / reproducing device 40 irradiates a recording medium with a laser beam so as to realize a reproducing function, and reads / writes signals of the recording marks 6 and the land pre-pits 4; Reading means 1
The position of the prewrite area 5 provided on the recording medium is determined from the signal output from the recording medium 4 and the irregular area detection means 12 for separating the 8/16 converted byte data signal.
A demodulation means 16 which receives the 8 / 16-converted byte data signal output from the irregular area detection means 12 and demodulates it into byte data;
Demodulation means 16 based on the address of the pre-write area 5 (address of the pre-written sector).
Error removing means 17 for removing the modulation error data read from the pre-write area 5 from the demodulated byte data received from the receiver, and byte data from which the modulation error data has been removed from the error removing means 18 are included in the byte data. Error correcting means 18 for performing error correction for each ECC block using an error correcting code
Decrypts (descrambles) if the content data output from is encrypted (scrambled)
Encryption / decryption means 19 for performing content data and content / content data output from the encryption / decryption means 19
Data reproducing means 20 and content / data reproducing means 2
0, an output terminal 21 for outputting a signal reproduced by the recording medium 0, the medium identification data read from the medium identification area 2a of the Lead In area 2 provided on the innermost track of the recording medium from the error removing means 17, and Each of the medium identification unit 22 that receives the encryption key data, identifies the medium, and provides the encryption key data to the encryption / decryption unit 19, and the irregular area detection unit 12, the error removal unit 17, and the content / data reproduction unit 20 Control means 15 for controlling is provided.

The error removing means 17 reads the data for removing the modulation error data from the binary data based on the address of the prewrite area 5 (address of the prewritten sector) from the land prepit signal reproducing means 24. Read gate generating means 30 for generating a gate
A read data buffer means for removing modulation error data recorded in the prewrite area from the demodulated byte data received from the demodulation means on the basis of a read gate provided from the read gate generation means;
And 1.

The error correction means 18 has an error correction impossible detection means 32 for detecting data for which error correction is impossible when performing error correction on the byte data supplied from the read data buffer means 31.

The encryption / decryption means 19 has a non-decryption detection means 33 for detecting data that cannot be decrypted with the encryption key data when decrypting the content data.

Further, the recording / reproducing device 40 includes the control device 1
5 is provided with operation means 34 for giving operation signals such as writing and reading to and from a recording medium.

With the above configuration, the recording / reproducing apparatus 40
Writes and reads content data to and from the recording medium.

Using the flowchart, the recording / reproducing device 4
The operation procedure for writing and reading content data to and from a recording medium according to the method No. 0 will be described. Note that the recording medium according to the present invention has a medium identification area 2a of the Lead In area 2.
It is assumed that data “DVD-R” is converted into 8/16 and recorded as medium identification data, and other recording media are “DVD-RO” as medium identification data.
M "is recorded. In the following description, DVD-R and DVD-ROM are given as recording media.
The operation of the recording / reproducing device 40 for these will be described.

FIG. 7 is a flowchart showing an operation procedure for reading content data from a recording medium by the recording / reproducing apparatus 40.

When an operation signal for reading a recording medium is given from the operation means 34 to the control means 15, the control means 15
Indicates that the laser drive means 9 has a Lead I of the recording medium.
A control signal for irradiating a laser beam for reading the medium identification data and the encryption key data in the n region 2 is given. The laser driving means 9 drives the laser light irradiation means 7 to irradiate the laser light to the Lead In area 2 of the innermost track 1 of the recording medium. The laser beam receiving unit 8 receives the reflected beam of the laser beam irradiated from the laser beam irradiating unit 7 by the recording mark 6 and supplies an electric signal corresponding to the received beam to the signal beam separating unit 23. The signal separating unit 23 supplies the demodulating unit 16 with the electrical signal of the 8/16 converted byte data received from the laser beam receiving unit 8. Demodulation means 16
Demodulates the 8 / 16-converted byte data, and supplies the medium identification data and the encryption key data to the read data buffer means 31 as byte data. The read data buffer unit 31 stores the medium identification data and the encryption key data in the medium identification unit 2 based on the control signal from the control unit 15.
2 (step S21, hereinafter (S21)).

The medium identification means 22 supplies the encryption key data to the encryption / decryption means 19, identifies the type of the recording medium based on the medium identification data, and outputs the identification result to the control means 1.
5 and the encryption / decryption means 19 (S2
2).

When the recording medium is “DVD-R”, (S
(Yes at 23), the control unit 15 gives the laser drive unit 9 a control signal for reading the recording marks 6 and the land prepits 4 from the data area of the recording medium. The laser driving means 9 drives the laser light irradiation means 7 to irradiate the recording medium with laser light. The reflected light reflected by the recording mark 6 and the land pre-pit 4 of the track 1 of the recording medium is received by the laser light receiving means 8 and an electric signal corresponding to the received light is converted into the signal light separating means 2
3 (S24).

The signal separating means 23 comprises the laser light receiving means 8
The signal of the byte data converted into 8/16 from the electric signal received from the receiver and the signal by the land pre-pit 4 are separated, and the signal of the byte data converted into 8/16 is supplied to the demodulation means 16. 4 to the land pre-pit signal reproducing means 24 (S2
5).

The demodulation means 16 demodulates the 8 / 16-converted byte data and gives it to the read data buffer means 17 as byte data (S26).

The land pre-pit signal reproducing means 24 reproduces the signal from the land pre-pit 4 given from the signal separating means 23. From the reproduced signal, the pre-write existing at the address after the land pre-pit 4 is performed, the address of the pre-write sector in which the error data is recorded is taken out and given to the read gate generating means 30 (S27).

The read gate means 30 generates a read gate based on the address of the pre-write sector given from the land pre-pit signal reproducing means 24 and supplies it to the read data buffer means 31. The read gate is a continuous pulse signal. The pulse signal at a position corresponding to the pre-write sector of the demodulated byte data is Low, and the other pulse signals are High. The row of byte data supplied to the read data buffer means 31 corresponds to the position of each pulse of the read gate.
The read data buffer unit 31 removes the byte data whose read gate pulse signal is Low from the byte data sequence, and supplies only the byte data corresponding to the High pulse signal to the error correction unit 18 (S28).

FIGS. 8 (a) to 8 (c) show the input byte data supplied to the read data buffer means 31, the read gate generated by the read gate means 30, and the byte data output from the read data buffer means 31. Show the model. As shown in FIG. 8A, when two prewrite sectors are detected, 18 sectors obtained by adding the number of prewrite sectors to 16 sectors forming one ECC block are set as processing units. In the byte data provided to the read data buffer means 31, the third sector and the fourteenth sector are pre-write sectors.

As shown in FIG. 8B, the read gate generating means 30 obtains the third pre-write sector information from the pre-write sector address information supplied from the land pre-pit signal reproducing means 24.
Only pulses corresponding to the sector and the 14th sector are Low.
Is generated and applied to the read data buffer means 31 as a read gate.

The read data buffer means 31 calculates the product (AND) of the given byte data and the read gate, and outputs the result as continuous data of 16 sectors for one ECC block shown in FIG. 8C. As a result, the third and fourteenth sectors, which are the prewrite sectors, are removed from the byte data and provided to the error correction means 18.
Since the 16 sectors from which the prewrite sector has been removed are the ECC blocks in the original meaning, a block composed of 16 sectors including the prewrite sector is called a virtual ECC block (see FIGS. 2 and 4).

If the recording medium is a "DVD-ROM" (No in S23), the control means 15
, A control signal for reading only the recording mark 6 from the data area 3 of the recording medium is given to the laser driving means 9 (S
30).

The laser light receiving means 8 receives the reflected light of the laser light emitted from the laser light irradiating means 7 by the recording mark, and outputs an electric signal corresponding to the received light. The 8/16 converted byte data signal from the laser beam receiving unit 8 is supplied to the demodulating unit 16 via the signal separating unit 23. The demodulation means 16 demodulates the 8/16 converted byte data and gives it to the read data buffer means 31 (S31).

The read data buffer means 31 supplies all of the applied byte data to the error correction means 18.

The error correction means 18 performs error correction of byte data using an error correction code for each ECC block (16 sectors) (S29).

If there is an ECC block for which error correction is not possible (Yes in S32), the error correction impossible detection means 32 detects the ECC block for which error correction is impossible, and
A read processing stop signal is transmitted to the control means 15, and the control means 15 sends a stop signal to each means such as the laser driving means 9 and the content / data reproducing means 20, and stops the reading processing and ends (S38). .

If the error correction is normally performed (S32
No), only the content data excluding the error correction code is given to the encryption / decryption means 19. Encryption decryption means 19
Confirms whether the content data is encrypted, and if not encrypted (No in S33),
Content data reproduction means 20
Give to.

If the content data is encrypted (Yes in S33), it is confirmed again whether or not the recording medium is "DVD-R". If the recording medium is "DVD-R" (Yes in S34), it is determined that the content data relating to the copyright has been illegally duplicated on the recording medium of "DVD-R", and a read processing stop signal is issued. Is transmitted to the control means 15. The control unit 15 that has received the reading stop signal sends a stop signal to each unit such as the laser driving unit 9 and the content / data reproducing unit 20 to stop the reading process and end (S38).

If the recording medium is not "DVD-R" (No in S34), the content
The data is decrypted (S35).

If the decryption of the content data is not possible because the encryption key data is not appropriate (S3
(Yes in 6), the decryption impossible detection means 33 detects this and sends a read processing stop signal to the control means 15.
A read processing stop signal is transmitted to the control unit 15. The control unit 15 that has received the reading stop signal sends a stop signal to each unit such as the laser driving unit 9 and the content / data reproducing unit 20 to stop the reading process and end (S38).

If the decryption of the content data has been performed normally (No in S36), the decrypted content
The data is provided to the content data reproducing means 20, and the content data is reproduced and output from the output terminal 21 (S37).

According to the above-described procedure, the reading of the byte data from the recording medium and the reproduction of the content data are performed.

FIG. 9 is a flowchart showing an operation procedure of writing content data to a recording medium by the recording / reproducing apparatus 40.

When an operation signal for reading a recording medium is given to the control means 15 from the operation means 34, the control means 15
Indicates that the laser drive means 9 has a Lead I of the recording medium.
A control signal for irradiating laser light for reading medium identification data and encryption key data from n region 2 is given. The laser driving means 9 drives the laser light irradiation means 7 to irradiate the laser light to the Lead In area 2 of the innermost track 1 of the recording medium. The laser light receiving means 8 receives the reflected light of the laser light irradiated from the laser light irradiating means 7 and supplies an electric signal corresponding to the received light to the signal light separating means 23. The signal separating unit 23 supplies the demodulating unit 16 with the electrical signal of the 8/16 converted byte data received from the laser beam receiving unit 8. The demodulation means 16 demodulates the 8 / 16-converted byte data, and provides the medium identification data and the encryption key data to the read data buffer means 31 as byte data. The read data buffer unit 31 provides the medium identification data and the encryption key data to the medium identification unit 22 based on the control signal from the control unit 15 (S4).
1).

The medium identification means 22 supplies the encryption key data to the encryption / decryption means 19, identifies the type of the recording medium based on the medium identification data, and outputs the identification result to the control means 1.
5 and the encryption / decryption means 19 (S4
2).

When the recording medium is “DVD-R”, (S
(Yes in 43), the control unit 15 gives the laser drive unit 9 a control signal for reading the land pre-pits 4 from the data area 3 of the recording medium. The laser driving means 9 drives the laser light irradiation means 7 to irradiate the recording medium with laser light. The laser light receiving means 8 receives the reflected light reflected by the land pre-pits 4 of the track 1 of the recording medium, and supplies an electric signal corresponding to the received light to the signal light separating means 23. The signal separating means 23 gives a signal from the land pre-pit 4 received from the laser light receiving means 8 to the land pre-pit signal reproducing means 24. The land pre-pit signal reproducing means 24 reproduces the address of the pre-write sector from the signal by the land pre-pit 4 and gives it to the write gate generating means 25 (S4).
4).

From the input terminal 10, the content data recorded on the recording medium is inputted and given to the error correction code adding means 11. The error correction code adding means 11
An inner code and an outer code (see FIG. 3) as error correction codes are added to the content data of every 3024 bytes (172 bytes × 192 bytes), and 16 sectors (32768) are added.
The byte data forming the (byte) ECC block is given to the write data buffer means 26 (S45).

The write gate means 25 generates a write gate based on the address of the pre-write sector given from the land pre-pit signal reproducing means 24 and supplies it to the write data buffer means 26.

As shown in FIG. 10A, a write gate is a continuous signal of pulses, and each pulse is a signal obtained by dividing byte data supplied to the write data buffer means 26 into sectors (2 Kbytes). It corresponds to a sector (FIG. 10B). When recording byte data on track 1, a pulse signal corresponding to a sector that will be overwritten on a prewrite sector appears as High in the write gate, and a pulse signal at other positions is L.
Appears as ow.

The write data buffer means 26 checks the pulse signal of the write gate for the byte data of each sector, and if the pulse signal is High, inserts a sector having no data in the sector portion to generate a pulse signal. The sector of High byte data is delayed by one sector. In this way, as shown in FIG.
Byte data having no data in a portion corresponding to the prewrite sector is created and given to the recording pulse generating means 27 (S46).

The recording pulse generator 27 converts the byte data supplied from the write data buffer 26 into 8/1.
The control signal corresponding to the 6-converted and 8 / 16-converted byte data is given to the laser driving means 9 (S47).

The laser driving means 9 supplies a driving signal to the laser beam irradiation means 7 based on the control signal given from the recording pulse generating means 27. The laser light irradiating means 7 irradiates the recording medium with laser light based on the given drive signal to form a recording mark 6 in which byte data is converted into 8/16 on the track 1 (S48).

If the recording medium is not "DVD-R" (No in S43), the control means 15 sends a stop signal to the error correction code adding means 11 and the like to stop the writing process and end (S49). ).

With the above procedure, the writing of the content data to the recording medium is performed.

According to such a recording medium and a recording / reproducing apparatus, the contents of the DVD-ROM can be read by Shift Read
DVD-R or DVD-R /
Even if W is illegally prewritten to the medium identification area 2a of the Lead In area 2 as "DVD-ROM", or if it is used as a DVD-ROM by some method, the normal reproduction is performed as follows. Can be prevented.
In this case, as shown in FIG. 11A, first, byte data including a prewrite sector is given to the read data buffer means 26. Since the recording medium is identified as a DVD-ROM by the medium identifying means 22, the read gate generating means 30 generates a read gate in which all the pulse signals are High, as shown in FIG. Therefore, the read data buffer means 26
As shown in FIG. 1 (c), the byte data is supplied to the error correction means 18 in a state in which the pre-write sectors for two sectors for which error correction is impossible are still included in the ECC block. The error correction means 18 performs error correction using an error correction code.
It is impossible to correct an error (4K bytes) corresponding to a sector. Therefore, the error correction impossible detection means 32
Detects that error correction is not possible, sends a read processing stop signal to the control means 15, and the control means 15 stops the read processing.

As described above, the DVD-R is replaced with the DVD-ROM.
DVD-ROM
It is possible to prevent a DVD-R in which data such as the above is illegally copied from being reproduced normally.

In the embodiment, the write-once recording medium (DVD-R) has mainly been described. However, also in the rewritable recording medium (DVD-R / W), the prewrite area 5 is formed by embossing pit rows. The same operation and effect can be obtained by forming.

The embodiments of the present invention are not limited to the above-described embodiments, and can be variously modified. For example, the Lead In area 2 including the medium identification area 2a and the encryption key area 2b is provided on the innermost track 1 of the recording medium.
The position of the ad In area 2 is not limited to the innermost track 1 and may be changed as appropriate.

Although the prewrite area 5 in which the modulated error data is recorded is provided in units of sectors, the prewrite area 5 may be provided in a part of the sector instead.

Further, the third and the first in the ECC block
Although the prewrite area 5 is provided for four sectors, the prewrite area 5 is not limited to these sector positions and may be appropriately changed and provided. In this case, the order prewrite area 5 may be provided from the first sector in the ECC block, may be provided sequentially from the last sector, or may be provided in a sector at a random position.

Further, the prewrite area 5 is provided for all the ECC blocks.
The pre-write area 5 may be provided in the C block. In this case, the prewrite area 5 can be provided for half of all ECC blocks. However, if the storage capacity of the recording medium of the present invention is set to 4.7 Gbytes, it is determined that the current recording medium is copyright-free. In order to enable copying from a recording medium having a storage capacity of 3.9 Gbytes, a prewrite area 5 may be provided in an ECC block corresponding to 0.8 Gbytes, which is the difference between the two recording media. .
Furthermore, the positions of the ECC blocks in which the prewrite area 5 is provided are sequentially provided from the data area 3 following the Lead In area 2, provided from the last track, provided at random, or provided collectively for a predetermined number of ECC blocks. Etc. can be applied.

Further, RS (Rea) is used as an error correction code.
dSolomon) code, but other error correction codes may be used. In this case, it is preferable to provide a sufficient prewrite area in the ECC block so that error correction cannot be performed by the adopted error correction code.

Further, as a condition for identifying the recording medium of the present invention, the medium identification data recorded in the medium identification area 2a in the Lead In area 2 is "DVD-R". The condition may be that the truck is wobbled (meandering).

Further, the recording / reproducing apparatus is provided with means for checking whether or not there is a digital watermark (Water Mark) in the data to be reproduced.
-R "and an electronic watermark (Water
(rMark), the reproduction of the data may be stopped.

Further, as a method of providing the prewrite area 5 on the write-once recording medium, the recording mark 6 is provided, but a pit row may be provided by embossing.

In the embodiment, the recording / reproducing apparatus capable of reproducing a plurality of recording media including the recording medium of the present invention is described. However, a recording / reproducing apparatus dedicated to the recording medium of the present invention may be used.
Further, the apparatus may perform only one of recording and reproduction.

[0132]

According to the recording medium of the present invention, the apparatus for manufacturing this recording medium, and the apparatus for recording or reproducing information on this recording medium, it is intended to reproduce data that has been illegally duplicated on the recording medium. In this case, the ECC block for error correction includes error data that exceeds the error correction capability of the error correction code, and the error correction cannot be performed normally. Can be prevented from being reproduced. Therefore, content recorded on a DVD-ROM, etc.
Prevents data from being copied illegally
The rights and interests of the data provider can be protected, and the content data can be supplied to the consumer at a lower cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a recording medium of the present invention.

FIG. 2 is an enlarged view of a region A in FIG. 1 and is a schematic diagram showing a track of a recording medium of the present invention.

FIG. 3 is a diagram showing an ECC block in which error correction is performed.

FIG. 4 shows Shift Readi on a recording medium of the present invention.
FIG. 4A is a diagram showing duplication of bit-by-bit data by ng. FIG. 4A is a diagram showing a state in which data is recorded from a Lead In area of a recording medium, and FIG. FIG.

FIG. 5A is a block diagram showing an outline of a prewrite apparatus (an irregular area forming apparatus) for forming a prewrite area of a write-once type recording medium according to the present invention.

FIG. 5B is a block diagram showing an outline of a prewrite device (irregular region forming device) for forming land prepits and prewrite regions of the rewritable recording medium of the present invention.

FIG. 6 is a block diagram showing an outline of an apparatus for writing and reading data with respect to the recording medium of the present invention.

FIG. 7 is a flowchart showing a procedure for reading and reproducing data from the recording medium of the present invention using the recording / reproducing apparatus of the present invention.

8A and 8B are diagrams showing how error data recorded in a pre-write area is removed from data read from a recording medium. FIG. 8A is a diagram showing data input to a read data buffer unit, and FIG. FIG. 4 is a diagram showing a read gate generated by a read gate generating unit, and FIG. 4C is a diagram showing data output from a read data buffer unit.

FIG. 9 is a flowchart showing a procedure for writing data on the recording medium of the present invention using the recording / reproducing apparatus of the present invention.

10A and 10B are diagrams showing a procedure for writing data by skipping a pre-write area of a recording medium, and FIG. 10A is a diagram showing data input to a write data buffer unit;
FIG. 3B is a diagram illustrating a write gate generated by a write gate generating unit, and FIG. 3C is a diagram illustrating data output from a write data buffer unit.

11A and 11B are diagrams showing a state of data when a recording medium of the present invention is reproduced as a DVD-ROM, and FIG. 11A is a diagram showing data input to a read data buffer unit;
FIG. 3B is a diagram illustrating a read gate generated by a read gate generating unit, and FIG. 3C is a diagram illustrating data output from a read data buffer unit.

FIG. 12 is a schematic diagram showing tracks of a conventional recording medium,
(A) is a schematic diagram of a DVD-ROM, and (b) is a DVD-ROM.
-R or DVD-R / W, (c) is a DV
FIG. 2 is a schematic diagram of a D-RAM.

13A and 13B are schematic diagrams showing a track configuration of a conventional recording medium, wherein FIG. 13A is a schematic diagram of a DVD-ROM, and FIG.
Schematic diagram of DVD-R or DVD-R / W.

FIG. 14 is a flowchart showing a procedure when a conventional recording medium is reproduced by a conventional reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 1 track 2 Lead In area 2a medium identification area 2b encryption key area 3 data area 4 land prepit 5 prewrite area 6 recording mark 7 laser light irradiation means 8 laser light reception means 9 laser drive means 10 input terminal 11 error correction code addition means 12 Anomalous area detection means 13 Write data generation means 14 Writing / reading means 15 Control means 16 Demodulation means 17 Error removal means 18 Error correction means 19 Encryption / decryption means 20 Content data reproduction means 21 Output terminal 22 Medium identification means 23 Signal separation Means 24 Land pre-pit signal reproducing means 25 Write gate generating means 26 Write data buffer means 27 Recording pulse generating means 30 Read gate generating means 31 Read data buffer means 32 Error correction impossible detecting means 33 Decoding impossible Outputting means 34 Operating means 40 Control means 41 Land prepit signal reproducing means 42 Prewrite sector determining means 43 Prewrite signal generating means 44 Recording mark forming means 45 Laser beam irradiation means 50 Control means 51 Address generating means 52 Land prepit signal generating means 53 Prewrite sector determination means 54 Switching means 55 Prewrite signal generation means 56 Land prepit formation means 57 Pit formation means 58 Laser light irradiation means 59 Laser light irradiation means

Continuation of the front page F term (reference) 5D044 BC05 BC06 CC04 DE02 DE03 DE49 DE68 GK17 HL08 5D090 AA01 BB03 BB04 CC01 CC04 CC14 GG16 GG27 GG32

Claims (16)

[Claims] 1. A recording medium for recording modulated data obtained by modulating byte data containing content data and an error correction code of the content data according to a predetermined modulation rule, wherein the recording medium comprises: A truck, the truck comprising:
Each of the plurality of blocks includes at least one sector, and each of the plurality of blocks is configured to record modulated data corresponding to L-byte data. At least one of the plurality of blocks includes an irregular area in which modulated error data corresponding to M bytes of byte data is formed in advance, and is error-correctable or error-detectable by the error-correcting code. The upper limit of the number of bytes is N, and L, M, and N are N <
A recording medium having a value satisfying M <L. 2. The recording medium according to claim 1, wherein a predetermined track of said plurality of tracks is provided with an identification area for recording identification data for identifying a type of the recording medium. 3. Each of the plurality of blocks is configured such that modulation corresponding to L-byte data is performed, and encrypted data is recorded. 3. The recording medium according to claim 2, further comprising a key area for recording an encrypted key used for decrypting the encrypted data. 4. The recording medium according to claim 1, wherein said irregular area is provided for each sector. 5. The recording medium according to claim 1, wherein the irregular area is provided in a partial area of the sector. 6. The recording medium according to claim 1, wherein each of the plurality of blocks includes the irregular area. 7. The recording medium according to claim 1, wherein each of the plurality of tracks is an additional recording type in which data once written is not erased, and predetermined data is previously written in the irregular area. . 8. The recording medium according to claim 1, wherein each of the plurality of tracks is of a rewritable type in which once written data can be erased, and wherein the irregular area has a predetermined pit row. . 9. The recording medium according to claim 7, wherein said predetermined data is data modulated according to said modulation rule. 10. The recording medium according to claim 7, wherein the predetermined data is data that is not generated by the modulation according to the modulation rule. 11. A reproducing device for reading data modulated according to the modulation rule from the recording medium according to claim 1, wherein the reading device reads the modulated data, and the data is output from the reading device. Demodulation means for demodulating the modulated data in accordance with the inverse conversion of the modulation rule and outputting as demodulated data; anomaly area detection means for detecting a position of the anomaly area; and a detection result of the anomalous area detection means. Error removing means for removing the erroneous data from the demodulated data, based on the error correction code, A reproducing device for reproducing the data corrected by the error correcting device. 12. A reproducing apparatus for reading the modulated data from a plurality of recording media including the recording medium according to claim 2, wherein: the reading unit reads the modulated data; Demodulation means for demodulating the output modulated data in accordance with the inverse conversion of the modulation rule, and outputting the demodulated data as demodulated data; and determining a type of a recording medium based on the medium identification data output from the demodulation means. Medium identification means for identifying; anomalous area detection means for detecting the position of the anomalous area; and if the identification result by the medium identification means is a predetermined medium, the demodulation based on the detection result of the anomalous area detection means. Error removing means for removing the error data from the demodulated data and outputting the demodulated data as it is when the identification result is other than the predetermined medium; An error correction unit that corrects data output from the error removal unit for each block using an error correction code; and a reproduction unit that reproduces data that has been error corrected by the error correction unit. A reproducing apparatus, wherein the error correction means includes an uncorrectable detection means for detecting data that cannot be corrected. 13. A reproducing apparatus for reading said modulated and encrypted data from a plurality of recording media including the recording medium according to claim 3, wherein said reading means reads said modulated data. Demodulation means for demodulating the modulated data output from the reading means in accordance with the inverse conversion of the modulation rule, and outputting the demodulated data as demodulated data; based on the medium identification data output from the demodulation means Medium identification means for identifying the type of the recording medium by using the method; an irregular area detection means for detecting the position of the irregular area; and detecting the irregular area detection means when the identification result by the medium identification means is a predetermined medium. The error data is removed from the demodulated data based on the result, and the demodulated data is output. If the identification result is other than the predetermined medium, the demodulated data is output as it is. Error correcting means, using the error correction code, error correcting means for correcting the data output from the error removing means for each of the blocks, and when the error corrected data is encrypted. ,
Decryption means for decrypting the encrypted data using the encryption key and outputting the data, and when the error-corrected data is not encrypted, outputting the error-corrected data as it is; And reproducing means for reproducing data output from the decoding means, wherein the decoding means includes a decoding impossible detection means for detecting the data which cannot be decoded, A reproducing apparatus, wherein the error correction unit includes an uncorrectable detection unit that detects data that cannot be corrected. 14. A recording apparatus for recording the content data on the recording medium according to claim 1, wherein the correction code becomes the L byte together with the predetermined byte for each predetermined byte of the content data to be recorded. Code addition means for adding and outputting, an irregular area detection means for detecting the position of the irregular area, a modulation means for modulating and outputting data output from the code addition means according to the predetermined modulation rule, Recording means for writing data output from the modulation means to the track, the modulation means adding a delay to the modulated data so that the recording means skips the irregular area and writes data. A recording device including a delay unit. 15. An anomalous area forming apparatus for forming an anomalous area according to claim 6, wherein: a position determining means for determining a position for forming the anomalous area; and a predetermined position determined by the position determining means. And a writing means for writing the data. 16. An anomalous area forming apparatus for forming an anomalous area according to claim 7, wherein: a position determining means for determining a position for forming the anomalous area; and a pit at a position determined by the position determining means. An irregular region forming apparatus, comprising: processing means for forming a row.