JP5489139B1 - Playback device, playback method, and program - Google Patents

Abstract

A reproduction system capable of reproducing only specific information is realized by using a portable recording medium.
A reproduction apparatus includes a reproduction unit that reproduces data from a loaded recording medium, a storage unit that stores permission identification information, and a control unit. The control unit detects medium identification information recorded in the recording medium manufacturing process in a non-rewritable manner by a recording method different from the main data recorded on the recording medium from the loaded recording medium. The detected medium identification information is compared with the permission identification information stored in the storage unit, and data reproduction by the reproduction unit for the recording medium is permitted only when they match.
[Selection] Figure 4

Description

  The present disclosure relates to a playback apparatus and a playback method, and more particularly to a technique that enables playback of a specific portable recording medium in association with the playback apparatus.

JP 2011-118914 A JP 2009-169892 A Japanese translation of PCT publication No. 2008-502087

Patent Documents 1 and 2 disclose techniques for preventing unauthorized use of content and programs recorded on an optical disc.
Patent Document 3 discloses a technique regarding a ROM mark that can distinguish a ROM type record carrier duplicated from an original record carrier.

Currently, as an optical disc, a portable recording medium on which various contents, programs, and the like are recorded, such as a Blu-ray Disc (registered trademark) (hereinafter also referred to as “BD”) and a DVD (Digital Versatile Disc). Is popular.
A reproduction system using these portable recording media is designed on the assumption that media can be exchanged in the corresponding reproduction apparatus.

For example, in the case of a BD system, it is only necessary that data is recorded in conformity with the Blu-ray standard. The BD drive as a recording / reproducing apparatus performs reproduction regardless of the ROM type or the recordable type. Record on the disc.
Therefore, in the BD system, data read from the playback device (BD drive) may always change due to BD replacement.

The same applies to other optical discs, card media, and the like, and the data played back by the playback device varies depending on the exchange of media.
Further, when the semiconductor memory is used by being incorporated in an IC socket, or when the semiconductor memory is used by being soldered directly to a substrate, it is the same as the disk medium. Semiconductor memories have been standardized by the JEDEC Solid State Technology Association, ensuring compatibility among manufacturers. Therefore, naturally, there is a possibility that different data is read out by exchanging the semiconductor memory.

Here, consider that it is desired to read only specific information from a specific recording medium. In other words, this is a playback system in which the data to be read is always the same without being altered or changed.
If there is such a request, a semiconductor mask ROM is conventionally used as a recording medium.
In the mask ROM in which data is written in the circuit at the time of manufacture, information cannot be written or rewritten later, so the read data always has the same contents.

However, when it is required to always read data requiring a large capacity without alteration or change, using a mask ROM leads to a large cost increase. In that case, it is preferable if a large-capacity optical disk such as a BD can be used.
When it is considered that a portable recording medium such as an optical disk that is originally used for replacement is used for such a purpose, it is considered that the optical disk cannot be replaced.

As a method of making the optical disk non-exchangeable, first, a method of mechanically fixing the optical disk to the reproducing apparatus is conceivable. This is assumed to be performed by fixing the optical disk to the spindle motor with an adhesive. However, this is difficult to manufacture and cannot be repaired, increasing costs.
It is also conceivable to mechanically fix the optical disk to the spindle. However, in this case, a general spindle mechanism cannot be diverted, and a special part adopting a structure in which a hole is formed and screwed has to be employed, which also increases the cost.

Furthermore, in order to make the optical disk non-exchangeable, it is conceivable that the entire reproducing apparatus is sealed and cannot be disassembled.
For example, it is possible to detect that the playback device has been disassembled by attaching an opening confirmation seal. However, without visual confirmation, it cannot be known that it has been disassembled and is not complete.
In addition, it is conceivable that the reproducing apparatus is sealed with an adhesive or the like so that the reproducing apparatus cannot be disassembled after making the optical disk an ejecting mechanism. However, it is difficult to manufacture and cannot be repaired, increasing costs. In addition, the cost is increased by adding a countermeasure for heat generation by sealing the regenerator.

  Furthermore, it is conceivable that the optical disk is made a mechanism that cannot be ejected, and that the parts are surely destroyed when the reproducing apparatus is disassembled, and that the destruction is visible. However, in this case, it is difficult to manufacture, and it is necessary to replace a broken part at the time of repair, which increases costs. Furthermore, if it does not see, it will not know that it was decomposed | disassembled and is not perfect.

  As described above, these measures are costly due to the use of special parts and materials, and cost increases due to the addition of heat generation measures by sealing the regenerator, manufacturability, serviceability, It is necessary to take disadvantageous measures in terms of product cost and quality.

  Therefore, in the present disclosure, when a portable recording medium such as an optical disk is used, it is possible to construct a reproduction system that uses a mask ROM, that is, a reproduction system that reproduces only specific information that cannot be tampered with. Provide a method that can be realized at low cost.

  The reproducing device of the present disclosure is recorded on a recording medium from a reproducing unit that reproduces data with respect to the loaded portable recording medium, a storage unit that stores permission identification information, and the loaded recording medium. Detecting medium identification information recorded in a recording medium manufacturing process in a non-rewritable manner by a recording method different from the main data, collating the medium identification information with the permission identification information stored in the storage unit, and Only when the medium identification information matches the permission identification information, the control unit permits data reproduction by the reproduction unit on the recording medium.

The reproduction method according to the present disclosure is a loaded recording medium as a reproduction method of a reproduction apparatus including a reproduction unit that reproduces data from a loaded portable recording medium and a storage unit that stores permission identification information. From the above, the medium identification information recorded in the recording medium manufacturing process in an unrewritable manner by the recording method different from the main data recorded on the recording medium is detected, and the detected medium identification information and the above-described storage unit are stored in the storage unit. The permission identification information is collated, and only when the medium identification information matches the permission identification information, data reproduction by the reproduction unit for the recording medium is permitted.
The program of the present disclosure is a program that causes the arithmetic processing device in the playback device to execute the above processing.

In the present disclosure, the reproducing apparatus does not make the portable recording medium non-exchangeable, and can use it while being exchangeable. Since it is not impossible to replace it, normal equipment can be used for the regenerator. Cost increases due to heat generation measures due to the adoption of special parts and materials and sealing of the regenerator, deterioration of manufacturability, service Sexual deterioration does not occur.
In this case, the portable recording medium is such that medium identification information is recorded in a non-rewritable manner by a recording method different from the main data in the manufacturing process. The playback device collates this medium identification information with, for example, permission identification information stored in a nonvolatile manner in the device so that playback can be executed only when they match. That is, it is possible to reproduce only a specific recording medium.

  According to the present disclosure, a playback system that plays back only specific information that cannot be tampered with can be realized using a playback device that plays back a variable recording medium. As a result, there is an effect that a reproduction system that uses a mask ROM can be realized at low cost using a large-capacity recording medium such as an optical disk.

It is explanatory drawing of the optical disk used by embodiment of this indication. It is a block diagram of the reproducing | regenerating apparatus of embodiment. It is a block diagram of the recording / reproducing apparatus of an embodiment. It is explanatory drawing of the reproduction | regeneration control function of 1st Embodiment. It is a flowchart of the process at the time of the initial setting of 1st Embodiment, and normal operation. It is explanatory drawing of the reproduction | regeneration control function of 2nd Embodiment. It is explanatory drawing of the reproduction | regeneration control function of 3rd Embodiment. It is a flowchart of the MID storing process of the third embodiment. It is explanatory drawing of the recording control function of 4th Embodiment. It is a flowchart at the time of the normal operation | movement of 4th Embodiment.

Hereinafter, embodiments will be described in the following order. In the embodiment, a playback system using a BD (Blu-ray disc) as a portable recording medium is taken as an example.
<1. MID>
<2. Configuration of media drive device>
<3. First Embodiment>
<4. Second Embodiment>
<5. Third Embodiment>
<6. Fourth Embodiment>
<7. Modification and Program>

<1. MID>

First, MID (media ID) will be described.
The MID is medium identification information, and is information that is recorded in a non-rewritable manner in the recording medium manufacturing process by a recording method different from the main data recorded on the recording medium.
In the embodiment, a playback system using a BD type optical disc will be described. For example, in the case of a BD-ROM (Blu-ray Disc Read Only Format), a BD-ROM mark (BD-ROM Mark) and a BCA (Burst Cutting Area) Two kinds of IDs of PMSN (Prerecorded Media Serial Number) recorded in the above can be used as MIDs in the embodiment.
In the case of BD-R (Blu-ray Disc Recordable Format) and BD-RE (Blu-ray Disc Rewritable Format) which are recordable discs, a BD media ID (Media ID of BD Recordable Disc) recorded in the BCA is used. ) Can be used as the MID in the embodiment.

First, BCA will be briefly described.
FIG. 1 schematically shows the layout (area configuration) of the entire optical disc.
As main areas on the optical disc, a lead-in zone LI, a data zone DA, and a lead-out zone LO are arranged from the inner peripheral side.
In the lead-in zone LI, physical characteristics of the disc, management information for recording / reproduction, and the like are recorded. In the data zone DA, main data, for example, content data such as video and music, computer use data such as application programs, and the like are used. The lead-out zone LO may be a buffer area or management information may be recorded.

These areas are used for normal recording / reproduction, but a BCA is provided on the inner circumference side of the lead-in zone LI for the purpose of managing individual discs.
As shown in the figure, the BCA is formed by a barcode-like pattern formed radially. This BCA has a barcode-like reflective pattern formed by forming a high-reflectance region and a low-reflectance region alternately appearing in the track line direction in the track pitch direction (radial direction). Is done. For example, the high reflectance region and the low reflectance region are continuously formed in a radius of 21.0 mm to 22.2 mm to form a barcode.
In this case, since the pattern is a barcode pattern, information can be read in the range of this BCA without tracking.

In this BCA, information is recorded by, for example, a recording method in which the reflective film of the recording layer is burned out.
The PMSN recorded in the BCA of the BD-ROM records different values for each disk.
In BD-R and BD-RE, different values are recorded in the BCA as BD media IDs in units of one disc.
In order to record BCA on these BD type discs, an expensive YAG laser is required, so that it is difficult to forge BCA.

Next, the BD-ROM mark will be briefly described.
The BD-ROM mark is designed to prevent mass production of pirated copies due to unauthorized mastering by writing special pits that are difficult to process on the master disk. A device capable of writing the BD-ROM mark on the master disk is strictly controlled.
The BD-ROM mark is recorded with different values for each master unit, and the data content recorded on the disc can be specified. The recording / reproducing method of the BD-ROM mark is a black box, and it is difficult to copy not only a general BD recording apparatus but also a disk manufacturing factory.
That is, the BD-ROM mark is recorded on the master disk by a ROM mark inserter operated in a black box, and its value becomes deterministic or stochastic.
The BD-ROM mark can be detected by extracting a characteristic signal from the analog signal read by the optical pickup when the disc is reproduced.

In the embodiment, these BCA serial numbers and BD-ROM marks are used as MIDs, but both are recorded by a method different from the main data in the manufacturing process.
Here, it should be noted that the well-known “AACS Content Revocation” and “CSS Region Playback Control” employed in the BD and used for playback control do not correspond to the MID of the embodiment of the present disclosure.

The characteristics of “AACS Content Revocation” are as follows.
When AV (Audio Visual) content protected by AACS (Advanced Access Content System) is recorded on the BD-ROM disc, a “Content ID” unique to the recorded content is recorded.
“Content ID” is recorded together with a version number as a list of content IDs (Content Revocation List).
The playback device stores the “Content Revocation List” recorded on the BD-ROM disc in the nonvolatile memory, and updates it to a new “Content Revocation List” of “Version Number” each time the BD-ROM disc is inserted.
Every time a BD-ROM disc is inserted, the playback device checks the “Content ID” recorded on the optical disc, and if it is an ID registered in the “Content Revocation List” stored in the nonvolatile memory The reproduction of the BD-ROM disc is prohibited.

The difference between the “Content ID” in the “AACS Content Revocation” and the MID of the present embodiment such as the “BD-ROM Mark” described above is as follows.
“Content ID” is included in the main data (for example, AV content) recorded on the BD-ROM disc, but MID such as “BD-ROM Mark” is a BD-recording method different from the main data. It is recorded on the ROM disk and is not included in the main data.
“Content ID” is recorded only on AV content protected by AACS and not recorded on all BD-ROM discs, but MID such as “BD-ROM Mark” is recorded main data. Regardless of whether it is recorded on all BD-ROM discs.

Considering from the usage form of MID such as BD-ROM mark in the embodiment described later, “Content ID” in “AACS Content Revocation” is also different from MID in the following points.
In other words, the “Content ID” is stored in the nonvolatile memory together with the “Version Number” and is always updated to the latest function. However, the MID nonvolatile memory such as “BD-ROM Mark” in the embodiment is used. There is no concept of updating in storage, and it is necessary to intentionally store the data in the nonvolatile memory when the device is manufactured or when the device is used.
“AACS Content Revocation” forces reproduction control common to all devices compliant with the AACS standard, but reproduction control using MID in the embodiment does not force reproduction control common to all devices.

Next, the features of “CSS Region Playback Control” are as follows.
When AV content protected by CSS (Content Scrambling System) is recorded on a DVD-ROM disc, a “Region Code” indicating a region where reproduction of the recorded content is permitted is recorded.
A “Region Code” indicating the sales area is recorded on the playback device. There are two types of “Region Code” of the playback device: recording at the time of manufacture and registering at the time of use.
In the case of registration at the time of use, a DVD-ROM disc to which CSS is applied is inserted into the playback device, and registration is performed according to a user's instruction when the playback device recognizes the disc. In CSS, re-registration of a region by a user is permitted up to five times, and the method is known.

The difference between this “Region Code” and the MID of the present embodiment is as follows.
"Region Code" is included in the main data recorded on the DVD-ROM disc, but MID such as "BD-ROM Mark" is recorded on the BD-ROM disc by a recording method different from the main data. It is not included in the main data.
“Region Code” indicates the same value for different AV contents if the region is the same, but the MID used for playback control in the embodiment is an ID unique to the recording medium or main data, and is different. The same ID is not distributed to the main data.
“Region Code” is recorded only on the CSS protected AV content and not on all DVD-ROM discs, but MID is not recorded on all recorded BD-ROM discs. Is recorded.
Further, considering the use form of MID such as BD-ROM mark in the embodiment described later, “Region Code” and MID are different in the following points.
In CSS, the re-registration of the region registration by a known method is allowed up to 5 times. However, in the embodiment intended to fix the data from the playback device, a known method for re-registration by the user is not provided. .

As described above, “Content ID” in “AACS Content Revocation” and “Region Code” in “CSS Region Playback Control” do not correspond to the MID in the embodiment.

<2. Configuration of media drive device>

Next, a media drive device as an embodiment of a playback device will be described. FIG. 2 shows a configuration of a playback device 30A corresponding to a BD, and FIG. 3 shows a configuration of a recording / playback device 30B corresponding to the BD. The playback device 30A and the recording / playback device 30B are collectively referred to as a media drive device. It will be called 30.

A configuration example of the playback device 30A according to the embodiment will be described with reference to FIG.
The playback device 30A can perform playback corresponding to BD-ROM, BD-R, and BD-RE.

For example, in the case of a recordable BD (BD-R, BD-RE), a phase change mark (phase change mark) under the condition of a combination of a laser having a wavelength of 405 nm (so-called blue laser) and an objective lens having an NA of 0.85 And dye change marks are recorded / reproduced, and a data block of 64 KB (kilobytes) is recorded as one recording / reproduction unit (RUB) with a track pitch of 0.32 μm and a linear density of 0.12 μm / bit. Perform playback.
For a reproduction-only BD-ROM disc, reproduction-only data is recorded by embossed pits having a depth of about λ / 4. Similarly, the track pitch is 0.32 μm and the linear density is 0.12 μm / bit. A 64 KB data block is handled as one reproduction unit (RUB).

The RUB, which is a recording / playback unit, is a total of 498 frames generated by adding a link area of one frame before and after, for example, an ECC block (cluster) of 156 symbols × 496 frames.
In the case of a recordable disc, a groove (groove) is formed on the disc by meandering (wobbling), and this wobbling groove is used as a recording / reproducing track. Groove wobbling includes so-called ADIP (Address in Pregroove) data. In other words, the address on the disk can be obtained by detecting the wobbling information of the groove.

  The main data recorded as embossed pits, phase change marks, and dye change marks in the BD is RLL (1, 7) PP modulation method (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) Thus, recording is performed with a linear density of 0.12 μm / bit and 0.08 μm / ch bit. When the channel clock period is “T”, the pit (mark) length is 2T to 8T.

Such an optical disc 90 as a BD is loaded on a turntable (not shown) when loaded in the playback device 30A, and is rotated at a constant linear velocity (CLV) or a constant angular velocity (CAV) by the spindle motor 2 during the playback operation. The
At the time of reproduction, information is read out by a pit row (mark row) recorded on a track on the optical disc 90 by an optical pickup (optical head) 1.

In the inner peripheral area of the optical disc 90, for example, physical information of the disc is recorded as embossed pits or wobbling grooves as read-only management information, and the information is also read by the optical pickup 1.
Further, the ADIP information embedded as wobbling of the groove track on the optical disc 90 is also read out from the optical disc 90 by the optical pickup 1.
The above-described BCA reading is also performed by the optical pickup 1.

In the optical pickup 1, a laser diode serving as a laser light source, a photodetector for detecting reflected light, an objective lens serving as an output end of the laser light, a disk recording surface is irradiated with laser light, and An optical system or the like for guiding the reflected light to the photodetector is formed.
In the optical pickup 1, the objective lens is held so as to be movable in the tracking direction and the focus direction by a biaxial mechanism.
The entire optical pickup 1 can be moved in the radial direction of the disk by a thread mechanism 3.
The laser diode in the optical pickup 1 is driven to emit laser light when a drive current is passed by the laser driver 23.

Reflected light information from the optical disk 90 is detected by a photo detector, and is supplied to the matrix circuit 4 as an electric signal corresponding to the amount of received light.
The matrix circuit 4 includes a current-voltage conversion circuit, a matrix calculation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as photodetectors, and generates necessary signals by matrix calculation processing.
For example, a reproduction information signal (RF signal) corresponding to reproduction data, a focus error signal for servo control, a tracking error signal, and the like are generated.
When reproducing BD-R and BD-RE, a push-pull signal is generated as a signal related to the wobbling of the groove, that is, a signal for detecting wobbling.
The reproduction information signal output from the matrix circuit 4 is supplied to the data detection processing unit 5, the focus error signal and tracking error signal are supplied to the optical block servo circuit 11, and the push-pull signal is supplied to the wobble signal processing circuit 6, respectively.

The data detection processing unit 5 performs binarization processing of the reproduction information signal.
For example, the data detection processing unit 5 performs an A / D conversion process on the RF signal, a reproduction clock generation process using a PLL, a PR (Partial Response) equalization process, a Viterbi decoding (maximum likelihood decoding), and the like, and a partial response maximum likelihood decoding process A binary data string is obtained by (PRML detection method: Partial Response Maximum Likelihood detection method).
Then, the data detection processing unit 5 supplies a binary data string as information read from the optical disc 90 to the subsequent decoder 7.

The decoder 7 performs data demodulation, deinterleaving, ECC decoding, address decoding, and the like.
That is, when the binary data sequence decoded by the data detection processing unit 5 is supplied to the decoder 7, the decoder 7 performs demodulation processing on the binary data sequence to obtain reproduction data from the optical disc 90. For example, a demodulating process for data recorded on the optical disk 90 that has been subjected to run-length limited code modulation such as RLL (1, 7) PP modulation and an ECC decoding process for error correction are performed. Get playback data.
The data decoded to the reproduction data by the decoder 7 is transferred to the host interface 8 and transferred to the host device 100 based on an instruction from the system controller 10. The host device 100 is specifically a computer device, a game device, an AV (Audio-Visual) system device, or the like.

When reproducing the recordable optical disc 90, ADIP information processing is performed.
That is, the push-pull signal output from the matrix circuit 4 as a signal related to groove wobbling is converted into wobble data digitized by the wobble signal processing circuit 6. A clock synchronized with the push-pull signal is generated by the PLL process.
The wobble data is demodulated by the ADIP demodulating circuit 16 into a data stream constituting an ADIP address and supplied to the address decoder 9.
The address decoder 9 decodes the supplied data, obtains an address value, and supplies it to the system controller 10.

Servo operation is performed as follows.
The optical block servo circuit 11 generates various servo drive signals for focus, tracking, and thread from the focus error signal and tracking error signal from the matrix circuit 4 and executes the servo operation.
That is, a focus drive signal and a tracking drive signal are generated according to the focus error signal and the tracking error signal, and the biaxial driver 18 drives the focus coil and tracking coil of the biaxial mechanism in the optical pickup 1. Thus, a tracking servo loop and a focus servo loop are formed by the optical pickup 1, the matrix circuit 4, the optical block servo circuit 11, the biaxial driver 18, and the biaxial mechanism.
The optical block servo circuit 11 turns off the tracking servo loop in response to a track jump command from the system controller 10 and outputs a jump drive signal to execute a track jump operation.
The optical block servo circuit 11 generates a thread drive signal based on a thread error signal obtained as a low frequency component of the tracking error signal, access execution control from the system controller 10, etc. To drive. Although not shown, the sled mechanism 3 has a mechanism including a main shaft that holds the optical pickup 1, a sled motor, a transmission gear, and the like. The sled mechanism 3 drives the sled motor according to a sled drive signal. The slide movement is performed.

The spindle servo circuit 12 performs control to rotate the spindle motor 2 by CLV or CAV.
The spindle servo circuit 12 obtains the clock generated by the PLL processing for the wobble signal as the current rotational speed information of the spindle motor 2 and compares it with predetermined reference speed information to generate a spindle error signal.
Further, at the time of data reproduction, the reproduction clock generated by the PLL in the data detection processing unit 5 becomes the current rotational speed information of the spindle motor 2, so that it is compared with predetermined reference speed information to obtain a spindle error. A signal can also be generated.
The spindle servo circuit 12 outputs a spindle drive signal generated according to the spindle error signal, and causes the spindle driver 17 to perform CLV or CAV rotation of the spindle motor 2.
Further, the spindle servo circuit 12 generates a spindle drive signal in response to a spindle kick / brake control signal from the system controller 10, and also executes operations such as starting, stopping, acceleration, and deceleration of the spindle motor 2.
The spindle motor 2 is provided with, for example, FG (Frequency Generator) and PG (Pulse Generator), and the output is supplied to the system controller 10. Thereby, the system controller 10 can recognize the rotation information (rotation speed, rotation angle position) of the spindle motor 2.

Various operations of the servo system and the reproduction system as described above are controlled by a system controller 10 formed by an arithmetic processing unit (CPU: Central Processing Unit).
The system controller 10 executes various processes in accordance with commands from the host device 100 given via the host interface 8.

For example, when a read command for requesting transfer of data recorded on the optical disc 90 is supplied from the host device 100, the system controller 10 first performs seek operation control for the instructed address. That is, a command is issued to the optical block servo circuit 11, and the access operation of the optical pickup 1 targeting the address specified by the seek command is executed.
Thereafter, operation control necessary for transferring the data in the designated data section to the host device 100 is performed. In other words, data is read from the optical disc 90, the reproduction processing in the data detection processing unit 5 and the decoder 7 is executed, and the requested data is transferred.

The memory unit 19 comprehensively shows ROM (Read-Only Memory), RAM (Random Access Memory), nonvolatile memory, and the like. The nonvolatile memory is a flash ROM, an EEPROM (Electrically Erasable Programmable Read-Only Memory), or the like.
The ROM and the non-volatile memory in the memory unit 19 are used for storing the operation program, firmware, fixed processing coefficient information, table information, and the like of the system controller 10. The nonvolatile memory is also used for storing the MID read from the specific optical disk 90.
The RAM in the memory unit 19 is used to temporarily hold information such as a work area for processing by the system controller 10 and storage of management information read from the loaded optical disk 90.

Next, the configuration of the recording / reproducing apparatus 30B in FIG. 3 will be described.
This recording / reproducing apparatus 30B can perform reproduction corresponding to BD-ROM, BD-R, and BD-RE, and can perform recording on BD-R and BD-RE.
In the recording / reproducing apparatus 30B in FIG. 3, an encoder 21 and a write strategy unit 22 are added to the configuration of the reproducing apparatus 30A in FIG. The same parts as those in FIG.

In the recording / reproducing apparatus 30B of FIG. 3, the reproducing operation and the servo operation are performed in the same manner as the reproducing apparatus 30A.
When data is recorded on the recordable optical disc 90, user data is recorded as a phase change mark or a dye change mark on a track on the optical disc 90 by the optical pickup 1.

The encoder 21 performs modulation processing of recording data at the time of recording.
During recording, recording data is transferred from the host device 100, and the recording data is supplied to the encoder 21 via the host interface 8.
In this case, the encoder 21 performs error correction code addition (ECC encoding), interleaving, sub-code addition, and the like as recording data encoding processing. Further, the RLL (1-7) PP run-length limited code modulation is applied to the data subjected to these processes.

  The recording data processed by the encoder 21 is supplied to the write strategy unit 22. The write strategy section 22 performs laser drive pulse waveform adjustment for recording layer characteristics, laser beam spot shape, recording linear velocity, and the like as recording compensation processing. Then, the laser drive pulse is output to the laser driver 23.

Based on the laser driving pulse subjected to the recording compensation process, the laser driver 23 causes a current to flow through the laser diode in the optical pickup 1 to execute laser light emission driving. As a result, a mark corresponding to the recording data is formed on the optical disc 90.
The laser driver 23 includes a so-called APC circuit (Auto Power Control), and the laser output depends on the temperature or the like while monitoring the laser output power by the output of the laser power monitoring detector provided in the optical pickup 1. Control to be constant.
The target value of the laser output at the time of recording (and at the time of reproduction) is given from the system controller 10, and control is performed so that the laser output level becomes the target value at the time of recording (and at the time of reproduction).

The system controller 10 performs recording control according to an instruction from the host device 100.
For example, when a write command (write command) is issued from the host device 100, the system controller 10 first moves the optical pickup 1 to an address to be written. Then, the encoder 21 causes the encoding process described above to be executed on the data (for example, video data, audio data, etc.) transferred from the host device 100. Recording is executed by the laser driver 23 driving to emit light in accordance with the encoded data.

The configuration examples of the media drive device 30 (the playback device 30A and the recording / playback device 30B) have been described with reference to FIGS. 2 and 3, but various configuration examples are possible.
The media drive device 30 may be connected to the host device 100 in a wired or wireless manner, or may be built in the housing of the host device 100.

<3. First Embodiment>

A first embodiment using the media drive device 30 configured as described above will be described.
The media drive device 30 according to the embodiment implements a playback system that plays back only specific information that cannot be tampered with using a BD that is a variable recording medium.
The MID, which is medium identification information described in the following description, is the BD-ROM mark described above or the PMSN or BD media ID recorded in the BCA.

The media drive device 30 according to the embodiment generally realizes the following operation.
When the specific optical disc to be reproduced is a BD-ROM disc The MID value of one or more specific BD-ROM discs is stored in the memory unit 19 and the MID read from the loaded optical disc 90 is stored. If the value does not match the stored value, data reading from the optical disk 90 is not performed.

When the specific optical disc to be played is a BD-R disc or a BD-RE disc. The drive stores the MID value of one or more specific BD-R discs or BD-RE discs, and is loaded. If the MID value read from 90 does not match the stored value, data reading from the optical disk 90 is not performed. If the MID value read from the loaded optical disk 90 matches the stored value, data recording on the optical disk 90 is not performed.

In the first embodiment, the playback operation control will be described assuming a playback device 30A as the media drive device 30.
FIG. 4 shows a functional configuration for playback operation control according to the first embodiment.
On the optical disk 90, MID and main data are recorded.
The host device 100 requests the media drive device 30 to reproduce and transfer the main data recorded on the optical disk 90 loaded in the media drive device 30 to the host device 100 by the function as the data read processing unit 101. The transferred main data is received and necessary processing is performed.

The media drive device 30 includes a MID detection unit 31, an MID storage processing unit 32, a non-volatile memory 33, a collation processing unit 34, and a transfer control unit 35 as shown in the figure as functions for controlling playback operations.
The nonvolatile memory 33 is realized by the flash memory of the memory unit 19 shown in FIG.
The MID detection unit 31, the MID storage processing unit 32, the verification processing unit 34, and the transfer control unit 35 are realized by software programs as processing functions of the system controller 10.

  The MID detector 31 detects the MID recorded on the loaded optical disk 90. For example, the system controller 10 takes in information such as a BD-ROM mark extracted in the reproduction system by the data detection processing unit 5 and the decoder 7 in FIG.

The MID storage processing unit 32 is a function in which the system controller 10 performs a storage process on the nonvolatile memory 33 regarding the MID recorded on the optical disc 90.
The MID storage processing unit 32 has, for example, a function for determining whether or not an MID is already recorded in the nonvolatile memory 33, a function for receiving the MID detected by the MID detection unit 31, and a function for storing the MID in the nonvolatile memory 33. Is composed of.

The non-volatile memory 33 is a non-volatile storage element such as a flash ROM or an EEPROM in the memory unit 19 and stores the MID of the optical disc 90 that is permitted to be reproduced by the media drive device 30. That is, the MID of the specific optical disk 90 permitted to be reproduced is written by the MID storage processing unit 32 described above.
The MID stored in the nonvolatile memory 33 is identification information (permission identification information) of the medium permitted to be played back. For the sake of explanation, the MID stored in the nonvolatile memory will be referred to as “permitted MID”.

The collation processing unit 34 collates the MID read from the loaded optical disk 90 with the permitted MID stored in the nonvolatile memory 33.
The verification processing unit 34 compares the MID of the optical disk 90 with the MID detected from the MID detection unit 31, the function of reading the permission MID recorded in the nonvolatile memory 33, and the MID detected from the optical disk 90. It is configured with a function for determining whether or not it is done and transmitting the result to the transfer control unit 35.

When a request for reading main data recorded on the optical disc 90 is received from the host device 100, the transfer control unit 35 determines whether to transfer the main data to the host device 100 or return a message rejecting the transfer. Control is performed based on the collation result of the collation processing unit 34.
That is, the transfer control unit 35 controls execution / non-execution of the reproduction operation by each unit shown in FIG. 3 when a data read request is issued from the host device 100.

The system controller 10 of the media drive device 30 has such a functional configuration, thereby performing playback operation control as the processing shown in FIG.
FIG. 5A shows processing executed by the system controller 10 as the initial setting of the media drive device 30.

When the system controller 10 detects that the optical disk 90 is loaded, the system controller 10 advances the process from step F101 to F102, and performs MID detection.
When the optical disk 90 is inserted and chucked by the spindle motor 2 and can be rotated and played back as in a normal disk playback apparatus, the media drive apparatus 30 starts up when the disk is loaded under the control of the system controller 10. Is done. That is, the spindle motor is activated and set to a predetermined rotational speed, the focus search and focus servo-on operation of the optical pickup 1, the tracking servo-on operation, and the like are performed, so that data can be reproduced from the loaded optical disk 90. Then, management information is read from the optical disc 90. At this time, reading of the MID is also executed.
In step F102, the system controller 10 (MID detection unit 31) performs processing for receiving, for example, from the decoder 7, the MID value read and decoded by the operation at the time of loading the disc.

Subsequently, the system controller 10 (MID storage processing unit 32) checks in step F103 whether or not the permission MID is already stored in the nonvolatile memory 33.
If the permission MID has already been stored, the process is finished as it is.
On the other hand, if the permission MID is not yet stored in the nonvolatile memory 33, the process proceeds to step F104, and the system controller 10 (MID storage processing unit 32) uses the MID detected from the optical disk 90 loaded this time as the permission MID. Processing to be stored in the nonvolatile memory 33 is performed.

  By performing the initial setting process described above, in the media drive device 30, the MID of the optical disc 90 that has been initially loaded and made reproducible is stored in the nonvolatile memory 33 as a permitted MID. Subsequent MIDs of other optical disks 90 loaded are not stored as permitted MIDs.

After such initial setting, the system controller 10 performs the process of FIG. 5B during normal operation.
When the optical disk 90 is loaded, the system controller 10 advances the process from step F110 to F111, and detects the MID recorded on the loaded optical disk 90 by the function of the MID detection unit 31. The detected MID is transferred from the MID detection unit 31 to the verification processing unit 34 in the system controller 10.
Further, the system controller 10 (collation processing unit 34) reads the permission MID stored in the nonvolatile memory 33 in step F112.
In step F113, the system controller 10 (collation processing unit 34) collates the MID detected from the optical disc 90 with the permitted MID and determines whether or not they match.
In the system controller 10, the determination result is transferred to the transfer control unit 35.

Then, the system controller 10 (transfer control unit 35) proceeds to step F114 and permits data reading if the MID and the permitted MID match. In other words, the optical disk 90 loaded is set in a reproduction permission state, and when there is a read command from the host device 100 thereafter, reproduction of main data and transfer to the host device 100 are normally performed.
On the other hand, if the MID and the permitted MID do not match, the system controller 10 (transfer control unit 35) proceeds to step F115 and prohibits data reading. That is, the playback of the loaded optical disk 90 is prohibited, and thereafter, even if there is a read command from the host device 100, playback of main data and transfer to the host device 100 are not executed.

The following effects are acquired by performing the process of FIG.
The MID used in this embodiment is a serial number recorded in the BCA or a BD-ROM mark. The serial number of BCA is a unique value for each optical disc. In addition, the BD-ROM mark is a unique value for the same title, for example, as a program or content, and the mark cannot be inserted irregularly. Therefore, even if the title is the same, the data copy or data alteration on the optical disc is possible. Are not given the same MID.
5, only the optical disk 90 whose MID matches the permitted MID can be reproduced on the media drive device 30.
That is, after the manufacture of the media drive device 30, the optical disk 90 to be played back by the media drive device 30 is first loaded, so that the MID of the optical disk 90 becomes the permitted MID. By doing so, after that, the media drive device 30 becomes a playback device that plays back only the optical disc 90 (or only the optical disc 90 of the same regular title).
This can be realized, for example, by a system using an optical disc 90 which is a portable recording medium, which has been realized by using a semiconductor mask ROM.
That is, a reproduction system that reproduces only specific information that cannot be tampered with can be realized by using an optical disc reproducing apparatus.

For this reason, a reproduction system that uses a semiconductor mask ROM can be realized at low cost using a large-capacity recording medium such as an optical disk.
For example, in a BD, considering a multi-layer disc, the capacity is currently about 25 to 128 GB per disc. As such a large-capacity data reproduction system, a reproduction system that reproduces only specific information that cannot be tampered with can be realized inexpensively and easily.

More specifically, the media drive device 30 stores in advance the MID value that can be recorded only at the optical disc manufacturing factory and has a different value for each content unit or individual unit as a permitted MID, and only from the optical disc 90 having that value. The process of not reading data can be executed with simple logic, and can be realized simply by installing a program for performing the process as shown in FIG.
When the optical disk 90 is used as a recording medium as in this example, it can be realized by using a disk drive or the like mounted on a general computer system, and there is an advantage that it does not lead to an increase in cost.

  Further, there is no need to take a technique such as mechanically fixing a replaceable portable recording medium in the media drive device 30, making it impossible to eject, or sealing the device. Therefore, it is not necessary to use a special reproducing device structure or special parts, which is advantageous in terms of cost. In addition, when there is a problem such as failure or deterioration of a recording medium such as the optical disc 90 mounted in the media drive device 30, it can be easily replaced with a recording medium on which the same data is recorded. Repair and maintenance are also easy.

Further, a flash ROM may be used as a substitute for the semiconductor mask ROM, but in such a case, a countermeasure against tamper resistance is required. In the case of this embodiment, no tamper resistance is required.

<4. Second Embodiment>

A second embodiment will be described with reference to FIG.
This is an example in which by adding a drive authentication process, it is possible to identify an unauthorized media drive device that impersonates a regular media drive device 30 and reproduces a tampered optical disc 90 and to eliminate it. is there.

As shown in FIG. 6, a drive authentication processing unit 36 is added to the system controller 10 of the media drive device 30 in addition to the functions shown in FIG.
The host device 100 is also provided with a drive authentication processing unit 102.
Communication is performed between the host device 100 and the media drive device 30 via an interface standard transmission line 200 such as SATA (Serial Advanced Technology Attachment).

In this case, the drive authentication processing units 36 and 102 communicate with each other to perform authentication processing. That is, the host device 100 executes an authentication process for confirming whether or not the connected media drive device 30 is a legitimate device.
As the drive authentication processing method, it can be adopted as a well-known authentication method in which the ISO / IEC 9798 Entity Authentication standard is internationally recognized.
By providing such an authentication function between the host device 100 and the media drive device 30, unauthorized use due to impersonation of the media drive device 30 can be eliminated.

<5. Third Embodiment>

A third embodiment will be described with reference to FIGS.
As a condition for the media drive device 30 to store the MID, as described above with reference to FIG. 5A of the first embodiment, the optical disk loaded first in a state where the permission MID is not stored in the nonvolatile memory 33 One possibility is to store 90 MIDs.

Apart from this, a method of storing the MID value of the loaded optical disk 90 in the nonvolatile memory 33 of the media drive device 30 by a command from the host device 100 is conceivable.
However, in this case, it is appropriate not to allow anyone to issue commands, but to allow only authorized host devices to issue commands. Therefore, mutual authentication is performed between the command issuer and the media drive device 30, and a message authenticator for tampering confirmation is added to the command. In the third embodiment, an AKE (Authentication and Key Exchange) process is executed as a process for exchanging an encryption key for the command issuer and the media drive device 30 to generate and verify this message authenticator. It is an example.

FIG. 7 shows the functional configuration of each part. The same functions as those in FIG.
The functions of the system controller 10 of the media drive device 30 include an AKE processing unit 37 and an MID storage control unit 38 in addition to the functions of the MID detection unit 31, the verification processing unit 34, and the transfer control unit 35 shown in FIG. Functions are provided.
In addition to the data read processing unit 101, the host device 100 is provided with functions as an AKE processing unit 103 and an MID recording command unit 104.

The AKE processing unit 37 of the system controller 10 and the AKE processing unit 103 of the host device 100 execute mutual authentication and encryption key exchange. The encryption key may be either a common key method or a public key method.
There is an ISO / IEC 9798 Entity Authentication standard as an internationally recognized mutual authentication method. Similarly, there is the ISO / IEC 11770 Key Management standard as an internationally recognized encryption key exchange method, which can be adopted as a known method.

The MID recording command unit 104 reads a command for requesting that the host device 100 reads the MID of the currently loaded recording medium from the host device 100 and records the MID as a permitted MID in the nonvolatile memory 33. It is a function to issue.
The instruction includes an instruction code and a tampering confirmation code for confirming that the instruction code has not been tampered with. The instruction code may include time-varying parameters such as a random number and a sequence number.

The MID storage control unit 38 of the system controller 10 executes MID storage processing based on a command from the MID recording command unit 104.
The MID storage control unit 38 has a function of confirming that the MID recording command has not been tampered with, a function of receiving the MID recorded on the optical disc 90 from the MID detection unit 31, a function of storing the MID in the nonvolatile memory 33, Consists of

FIG. 8 shows processing of the system controller 10 of the media drive device 30 for storing the MID in the nonvolatile memory 33 and processing of the host device 100.
When the system controller 10 detects the loading of the optical disk 90, the system controller 10 proceeds from step F120 to F121. At this time, the system controller 10 notifies the host device 100 that the optical disk 90 is loaded. As a result, the host device 100 detects loading of the optical disk in step F200.

After detecting the optical disk loading, the AKE processing, that is, the mutual authentication and key exchange processing is executed between the AKE processing unit 103 of the host device 100 and the AKE processing unit 37 of the system controller 10. That is, the host device 100 performs the AKE process in step F201. In response to this, the system controller 10 proceeds from step F121 to F122, and performs the AKE process.
If the authentication is successful and the encryption key exchange is normally performed, the system controller 10 (AKE processing unit 37) determines that the AKE processing is successful and proceeds from step F123 to F125. The host device 100 also proceeds from step F202 to F203 due to the success of the AKE process.
On the other hand, if the authentication and key exchange are unsuccessful, the system controller 10 proceeds to step F124, reports an error to the host device 100, and ends the process. The host device 100 also ends the process without proceeding to step F203.

If the AKE process is successful, the host device 100 issues an MID storage command and data for tampering confirmation by the function of the MID recording command unit 104. That is, the instruction code and the alteration confirmation code are transmitted to the system controller 10.
In this case, the message authenticator calculated using the encryption key exchanged in the AKE process is transmitted as a tampering confirmation code. It is also conceivable to encrypt the MID storage instruction itself.
The system controller 10 (MID storage control unit 38) receives this in step F125. In step F126, it is confirmed whether the MID recording command has not been tampered with. That is, a message authenticator is calculated using the encryption key exchanged by the AKE process, and the instruction code is determined by checking whether or not this message authenticator matches the falsification confirmation code received together with the MID storage instruction from the host device 100. Check if it has been tampered with.
If it is determined that the information has been tampered with, the system controller 10 (MID storage control unit 38) notifies the host device 100 of an error in step F129 and ends the process.

If it is confirmed that the MID storage command has not been tampered with, the system controller 10 proceeds to step F127 and detects the MID of the loaded optical disk 90.
In step F128, the system controller 10 (MID storage control unit 38) performs processing for storing the detected MID in the nonvolatile memory 33 as the permitted MID.

By performing the above processing, storage of the permitted MID according to the command on the host device 100 side is realized.
The storage of the permission MID designates the optical disk 90 that is permitted to be reproduced, and therefore must be managed under strict management. Therefore, as shown in this example, after confirming that the host device 100 and the media drive device 30 are mutually authenticated and that the MID storage command is not falsified, the permitted MID is stored. To do. This prevents the setting of the optical disc 90 that is permitted to be reproduced by an unauthorized method.

  Note that the processing during normal operation of the media drive device 30 is the same as in FIG. 5B. That is, reproduction is permitted only when an optical disk 90 having a MID that matches the permitted MID is loaded.

In the third embodiment, the permission MID is stored in accordance with a command from the host device 100. However, as described in FIG. 5A, the MID of the optical disk loaded first is set as the permission MID. You may use together with a system.
For example, the MID of the optical disk 90 loaded first is stored as a permitted MID in the process of FIG. 5A even if there is no MID storage command from the host device 100. Thereafter, when adding a permitted MID, in the case where there is an MID storage command from the host device 100 in the process of FIG. 8, the MID of the loaded optical disk 90 is additionally stored as a permitted MID. is there.

<6. Fourth Embodiment>

The fourth embodiment is an operation example when a write command is generated in the media drive device 30. Assume that the media drive device 30 is the recording / reproducing device 30B of FIG.
In addition, although illustration and description are abbreviate | omitted regarding the memory | storage process of permission MID, and the reproduction | regeneration control at the time of normal operation, what is necessary is just to be the same as that of the said 1st-3rd embodiment.

FIG. 9 shows a functional configuration of the media controller 30 in the system controller 10 and the host device 100. The difference from FIG. 7 described above is that the recording controller 39 is provided in the system controller 10 and the data write command unit 105 is provided in the host device 100.
The data write command unit 105 has a function of requesting the media drive device 30 to write data to the optical disc 90 and transmitting data to be recorded to the media drive device 30.
In response to a data write request from the host device 100, the recording control unit 39 instructs the verification processing unit 34 to record data on the optical disc 90 or return a message rejecting the recording and receive the data. It is a function to control based on.

FIG. 10 shows processing during normal operation of the media drive device 30.
When the optical disk 90 is loaded, the system controller 10 advances the process from step F150 to F151, and detects the MID recorded on the loaded optical disk 90 by the function of the MID detection unit 31. The detected MID is transferred from the MID detection unit 31 to the verification processing unit 34 in the system controller 10.
The system controller 10 (collation processing unit 34) reads the permission MID stored in the nonvolatile memory 33 in step F152.
In step F153, the system controller 10 (collation processing unit 34) collates the MID detected from the optical disc 90 with the permitted MID and determines whether or not they match.
In the system controller 10, the determination result is transferred to the recording control unit 39.

If the MID and the permitted MID do not match, the system controller 10 (recording control unit 39) proceeds to step F154 and permits data writing. That is, the optical disk 90 loaded is set in a write-permitted state, and when there is a data write request from the host device 100 thereafter, the main data that is normally transferred is received and the operation of the recording system such as the encoder 21 is performed. Data recording on the optical disk 90 is executed.
On the other hand, if the MID and the permitted MID match, the system controller 10 (recording control unit 39) proceeds to step F155 and prohibits data writing. In other words, the optical disk 90 loaded is set in a write-inhibited state, and thereafter, even if there is a data write request from the host device 100, a message for rejecting recording is returned so that no data is received.

  In addition, although illustration is abbreviate | omitted regarding reproduction | regeneration control, it becomes the same as that of FIG. 5B. Accordingly, in step F155, it is sufficient to prohibit data writing and permit data reading. In step F154, data writing may be permitted and data reading may be prohibited.

According to the processing of FIG. 10, when an optical disc 90 registered in the permitted MID is loaded as a recording medium used in a reproduction system that reproduces only specific information that cannot be tampered with, data recording on the optical disc 90 is executed. Can not. That is, the optical disk 90 cannot be altered or changed in the main data. As a result, it is guaranteed that only specific information is always reproduced by the media drive device 30 and delivered to the host device 100 for the optical disc 90 that is permitted to be reproduced.
On the other hand, with respect to the optical disk 90 that is not registered as a permitted MID, there is no problem even if data writing is performed. Therefore, by permitting, the usefulness of the media drive device 30 as the recording / reproducing device 30B is obtained. It is done.

<7. Modification and Program>

Although the embodiments have been described above, various modifications can be considered for the technology of the present disclosure.
In the embodiment, an example in which a BD is used as a portable recording medium has been described. However, a system using a CD (Compact Disc) optical disc or a DVD (Digital Versatile Disc) optical disc may be used. In this case, Postscribed ID (registered trademark) or BCA serial number information formed on these optical discs can be used as the MID.
Further, the present invention is not limited to an optical disk, and can also be applied to a system that reproduces various recording media such as a magnetic disk, a magneto-optical disk, a hologram disk, a card medium, and a volume medium.

The program according to the embodiment is a program that causes an arithmetic processing device such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor) to execute the processing of FIG. 5A or FIG. 8 or the processing of FIG. 5B or FIG. It is.
In other words, this program calculates a process for detecting medium identification information (MID) recorded from the loaded recording medium in an unrewritable manner in the recording medium manufacturing process by a recording method different from the main data recorded on the recording medium. Have the processing device execute.
In addition, the processing unit is caused to execute processing for comparing the detected MID with the permission identification information (permission MID) stored in the storage unit.
Further, only when the MID and the permission MID match, the arithmetic processing unit is caused to execute a process for permitting data reproduction by the reproduction unit for the loaded recording medium.
With such a program, it is possible to easily realize the media drive device 30 that constructs a reproduction system that can reproduce only specific information.

Such a program can be recorded in advance in an HDD as a recording medium built in a device such as a computer device, a ROM in a microcomputer having a CPU, or the like.
Alternatively, temporarily or permanently stored in a removable recording medium such as a flexible disk, CD-ROM (Compact Disc Read Only Memory), MO (Magnet optical) disk, DVD, BD, magnetic disk, semiconductor memory, memory card, etc. (Record). Such a removable recording medium can be provided as so-called package software.
Further, such a program can be downloaded from a removable recording medium to a personal computer or the like, or downloaded from a download site via a network such as a LAN (Local Area Network) or the Internet.
Further, such a program is suitable for providing a wide range of the media drive device 30 according to the embodiment.

In addition, this technique can also take the following structures.
(1) a playback unit for playing back data from a loaded portable recording medium;
A storage unit for storing permission identification information;
From the loaded recording medium, medium identification information recorded in an rewritable manner in the recording medium manufacturing process is detected by a recording method different from the main data recorded on the recording medium, and the medium identification information and the storage unit are stored. A control unit that permits data reproduction by the reproduction unit on the recording medium only when the medium identification information matches the permission identification information.
A playback device.
(2) The playback device according to (1), wherein the control unit stores medium identification information detected from a recording medium loaded first in the media drive device in the storage unit as the permission identification information.
(3) The control unit stores the medium identification information detected from the loaded recording medium in the storage unit as the permission identification information in response to a storage command from the mutually authenticated host device (1 ) Or (2).
(4) The control unit checks whether or not the storage command has been tampered with, and only when it is confirmed that the storage command has not been tampered with, identifies the medium detected from the loaded recording medium according to the storage command. The reproducing apparatus according to (3), wherein information is stored in the storage unit as the permission identification information.
(5) a recording unit for recording data on the loaded recording medium;
The control unit compares the medium identification information detected from the loaded recording medium with the permission identification information stored in the storage unit, and the medium identification information matches the permission identification information. The reproducing apparatus according to any one of (1) to (4), wherein data recording by the recording unit on the recording medium is permitted only when the recording medium is not present.
(6) The recording medium is an optical disk, and the medium identification information is information recorded on the optical disk as a ROM mark or information recorded on a BCA. Playback device.

  1 optical pickup, 4 matrix circuit, 5 data detection processing unit, 7 decoder, 10 system controller, 19 memory unit, 21 encoder, 31 MID detection unit, 32 MID storage processing unit, 33 nonvolatile memory, 34 collation processing unit, 35 Transfer control unit, 36 drive authentication processing unit, 37 AKE processing unit, 38 MID storage control unit, 39 recording control unit, 90 optical disk, 100 host device

Claims (3)

A reproducing unit for reproducing data from a loaded portable recording medium;
A playback device including a storage unit that stores permission identification information and a control unit,
The control unit
From the recording medium in which the loaded main data is recorded in an unrewritable manner, medium identification information recorded in the recording medium manufacturing process in a recording medium manufacturing process is detected by a recording method different from the main data recorded in the recording medium, Storing the medium identification information detected from the recording medium loaded first in the reproducing apparatus in the storage unit as the permission identification information;
Matches with the permission identification information from the recording medium loaded in the second or subsequent stored in the medium identification information and the storage unit detected, when the said medium identification information and the permission identification information match only , to permit data reproduction by the reproducing unit for the recording medium,
A reproducing apparatus characterized by that . As a playback method of a playback device having a playback unit that plays back data on a loaded portable recording medium, a storage unit that stores permission identification information, and a control unit ,
The control unit
From the recording medium in which the loaded main data is recorded in an unrewritable manner, medium identification information recorded in the recording medium manufacturing process in a recording medium manufacturing process is detected by a recording method different from the main data recorded in the recording medium,
Storing the medium identification information detected from the recording medium loaded first in the reproducing apparatus in the storage unit as the permission identification information;
The medium identification information detected from the recording medium loaded after the second time is collated with the permission identification information stored in the storage unit,
Only when the medium identification information described above were carried out matching and the above permission identification information match, allowing data reproduction by said reproducing unit with respect to the recording medium,
A reproduction method characterized by the above . For an arithmetic processing unit in a playback device having a playback unit that plays back data on a loaded portable recording medium and a storage unit that stores permission identification information,
Processing for detecting medium identification information recorded in a recording medium manufacturing process in an rewritable manner by the recording method different from the main data recorded in the recording medium from the recording medium in which the loaded main data is recorded in a non-rewritable manner When,
A process of storing the medium identification information detected from the recording medium loaded first in the reproducing apparatus in the storage unit as the permission identification information;
A process for matching the permission identification information from the recording medium loaded in the second or subsequent stored in the medium identification information and the storage unit detected,
Only when the medium identification information described above were carried out matching and the above permission identification information match, the process that allows the data reproduction by said reproducing unit with respect to the recording medium,
A program that executes

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