JP2003023419A - Information recording and reproducing device with scramble key management function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording and reproducing device, that uses new device key information to updating device key information of an encryption/decryption section, when a virgin recording medium is initialized to maintain the security, even if the device key information having precedingly been stored is stolen and becomes open to public. SOLUTION: The information recording and reproducing device uses an encoder 50, a decoder section 60, a data processor 1003, disk drive sections 2001, 1001, a microcomputer block 30, and encryption/decryption sections 2002, 1002 to attain recording and reproduction of information to/from a hard disk and an optical disk. The encryption/decryption sections 2002, 1002 store front device key information of the same contents which is unique to the device, written in advance at the manufacturing. The information recording and reproducing device creates new device key information, in the case of initializing a virgin optical disk and updates the front device key information of each of the encryption/decryption sections by the new device key information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing device with a scramble key management function, which has a plurality of information recording / reproducing devices built therein. As a recording / reproducing apparatus to which the present invention is applied, there is a device that can simultaneously handle a medium such as a hard disk (HDD) and a rewritable DVD (digital versatile disk).

[0002]

2. Description of the Related Art In recent years, in image compression technology, MPEG2 (Moving Image Coding Expert), which is currently internationally standardized
The DVD standard has been proposed that uses the Group) method and also employs the AC3 audio compression method.

According to the MPEG2 system layer, this standard supports the MPEG2 system as a moving image compression system,
AC3 audio compression method and MPEG as audio compression method
Supports audio compression method. Further, sub-picture data obtained by run-length compressing bitmap data for subtitles such as movies and karaoke can be handled. Further, in this standard, in relation to the playback device, special playback control data (navi pack) for fast forward and reverse feed is added. Furthermore, this standard supports the IS09660 and micro UDF standards so that the computer can read the data on the disc.

As the standard of the medium itself, DV is
Following the standard of the DVD-ROM which is a D-video medium, the standard of the DVD-RAM (recording capacity of about 4.7 GB) has been completed, and the DVD-RAM drive has begun to spread as a computer peripheral device.

Furthermore, at present, a DVD-Video standard that realizes a system capable of recording and reproducing information in real time using a DVD-RAM, that is, VR (Video record)
ing) -DVD standard is being completed, and verification work is scheduled to be completed soon. This standard is considered based on the DVD-Video standard currently on the market. Further, a file system compatible with the VR-DVD is currently standardized.

On the other hand, the hardware built in the recording / reproducing apparatus
A method of recording and reproducing a broadcast signal by using a disk device (HDD) has also been considered. 1 for hard disk drive
It is possible to record data of 00 GB or more.

As described above, due to the recording / reproducing medium having an increased recording capacity, and the progress of the signal processing technology, recently, an optical disk recording / reproducing device capable of handling a removable DVD-RAM and an HDD simultaneously built-in information. A recording / playback device is being considered.

Here, when considering the usage pattern of such a device, the following usage patterns are possible. That is, a broadcast program signal (or a reproduction signal from another medium) is converted into a predetermined format to convert it to a hard disk or a DVD-RA.
Record in M. Such recording processing is executed at intermittent program reservation times. In addition, a plurality of programs are once recorded in a built-in recording medium (hard disk). Then, the recorded programs are combined or partially deleted for editing, and the result of the editing is recorded on the hard disk or D.
Re-record in VD-RAM.

Usually, the hard disk is built in the device, and the DVD-RAM is used as a removable medium.

In recent years, it has been demanded that an apparatus for recording / reproducing information has a copy protection function in order to protect the copyright of the content. In order to perform copy protection, copy information is included in the content management information and header. When the copy information indicates that copying is prohibited, the content cannot be recorded on the recording medium. However, some content is copy-free and one-copy-permitted.
When the copy information indicates copy-free, it is necessary to record on the recording medium so that a free copy of the content can be obtained. If the copy information indicates that copying is permitted once, the content is scrambled so that normal playback cannot be performed even if dubbing is performed, and the management information and header are copied. Information is rewritten as copy-prohibited and recorded on a recording medium.

When reproducing the scrambled information from the recording medium, the scramble must be released. Key information is required to unscramble. As the key information, the key information including the device key written in the EPROM at the time of manufacturing the recording / reproducing apparatus is used.

[0012]

By the way, if the above device key is deciphered and opened, erased, or changed to a meaningless key by a fraudulent act, the above scramble is executed. Can not do it. If data is recorded on a recording medium without scrambling, for example, even if the copy information indicates that copying is prohibited, it is possible to dub non-scrambled contents and allow illegal transactions such as mass distribution and sale. Become.

Therefore, according to the present invention, even if the device key information necessary for scrambling is stolen due to an illegal act, the device key information can be automatically updated and the information recording / reproducing with a scramble key management function can be maintained. The purpose is to provide a device.

[0014]

In order to achieve the above-mentioned object, the present invention provides an apparatus having a plurality of information recording / reproducing sections capable of writing information to and reproducing information from a recording medium. A storage unit which is provided in each of the recording / reproducing units and which stores the pre-set device key information of the same content unique to the set written in advance at the time of manufacturing, and at least the media information when the virgin medium of the predetermined recording medium is initialized. A device key and means for creating unique new device key information; and means for replacing all the front device key information of each of the plurality of information recording / reproducing units with the new device key information. To do. As a result, when the virgin recording medium is initialized, the new device key information replaces the device key information A and B of the encryption / decryption unit of each recording / reproducing unit, so that the device key held before that is stored. Security is maintained even if the information is stolen and opened.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a recording / reproducing apparatus to which the present invention is applied.

When the blocks in FIG. 1 are roughly divided, the main blocks of the recording section are shown on the left side, and the main blocks of the reproducing section are shown on the right side. This information recording / reproducing apparatus includes a hard disk drive unit 2001 that drives a hard disk.
And an optical disk drive unit 1001 for rotationally driving an optical disk, which is an information storage medium capable of constructing a video file, to read / write information.

Reference numeral 1003 denotes a data processor section,
Recorded data can be supplied to the hard disk drive section 2001 and the optical disk drive section 1001, and reproduced data from the disk can be received.
In this case, the recording data supplied to the hard disk drive unit 2001 or the reproduction data received from the disc side is output or input through the encryption / decryption unit 2002. The recording data supplied to the optical disc drive unit 1001 or the reproduction data received from the disc side is output or input through the encryption / decryption unit 1002.

The data processor unit 1003 handles data in recording or reproducing units, and includes a buffer circuit, a modulation / demodulation circuit, an error correction unit and the like. A temporary storage unit 1004 that functions as a buffer is connected to the data processor unit 1003.

Further, this recording / reproducing apparatus has an encoder section 50 constituting a recording side and a decoder section 60 constituting a reproducing side.
And a microcomputer block 30 that controls the operation of the apparatus main body.

The encoder unit 50 includes a video and audio analog-digital converter (A / D) for digitizing the input analog video signal and the input analog audio signal, and a video encoder (V-
E) and an audio encoder (AE).
Furthermore, it also includes a sub-picture encoder. Further, it is provided with a formatter unit for converting the output of each encoder into a predetermined DVD-RAM format and a buffer memory. An external analog video signal and an external analog audio signal from the AV input section 41 or an analog video signal and an analog audio signal from the TV (television) tuner 42 are input to the encoder section 50.

When the digital video signal or the digital audio signal is directly input, the encoder unit 50 directly supplies the digital video signal or the digital audio signal to the formatter unit. Although not shown, each video data and audio data can be supplied to the video mixing unit and the audio selector.

In the video encoder, the digital video signal is converted into a digital video signal compressed at a variable bit rate based on the MPEG2 or MPEG1 standard. Digital audio signals are MPEG or AC
It is converted into a digital audio signal compressed at a fixed bit rate or a linear PCM digital audio signal based on the -3 standard.

When the sub-picture information is input from the AV input section 42 (for example, a signal from a DVD video player with an independent output terminal of the sub-picture signal), or a DVD video signal having such a data structure is broadcast, which is broadcast. When received by the TV tuner 42, the sub-picture signal in the DVD video signal is encoded (run-length compressed) by the sub-picture encoder (SP-E) and becomes a sub-picture bitmap. The same applies to signals such as captions and teletext.

The encoded digital video signal, digital audio signal, and sub-picture data are packed in a formatter to form a video pack, an audio pack, a sub-picture pack, and these are aggregated,
DVD-recording standards (eg DVD-RAM, DVD
-R, DVD-RW and other standards). This processing is performed by the RTR (real time recording) pack setting section of the formatter section.

Here, this apparatus uses the data processor 1003 in a predetermined recording unit for the information (pack of video, audio, sub-picture data, etc.) encoded by the encoder section 50 and the created management information. It can be supplied to the hard disk drive unit 2001 and recorded in the hard disk. In addition, the information recorded on the hard disk is read out via the data processor unit 1003 and the optical disk drive unit 1001, and the optical disk 100 is read.
It can also be recorded in 1. This is because the information recorded on the hard disk is the same as the data format of the optical disc 1001. However, in this case,
This is accompanied by the operation of the copy protection function described later.

Furthermore, the information encoded by the encoder section 50 and the created management information can be directly recorded on the optical disc through the data processor section 1003 and the optical disc drive section 1001. Furthermore, it is possible to delete (file or video object) recorded on the optical disk and the hard disk. Further, it is possible to perform an editing process of partially deleting video objects of a plurality of programs recorded on a hard disk or an optical disk, connecting objects of different programs, and the like. This is because the format according to the present invention defines a data unit (which will be described later) handled and facilitates editing. In this case as well, it goes without saying that the operation of the copy protection function described later is accompanied.

If the information recorded on the hard disk differs from the data format of the optical disk 1001, the encoder unit 50 encodes the information read from the hard disk. Then, the encoded information can be recorded on the optical disc.

The optical disc drive section 1001 has a rotation control system for the optical disc 1001 and an optical head control system (including a laser drive system and an optical system). The hard disk drive unit 2001 includes a rotation control system for the hard disk, a magnetic head control system, and the like.

The microcomputer block 30 has M
PU (Micro Processing Unit) or CPU
It includes a (central processing unit), a ROM in which a control program and the like are written, and a RAM for providing a work area necessary for executing the program.

MP of the microcomputer block 30
U follows the control program stored in the ROM,
Using the RAM as a work area, defect location detection, unrecorded area detection, recording information recording position setting, UDF recording, AV address setting, and the like for the recording medium are executed.

Further, the microcomputer block 30
Has an information processing unit necessary for controlling the entire system, including work RAM, directory detection unit, and VMG.
(Overall video management information) Information creation and management information analysis unit, copy related information detection unit, copy and scrambling information processing unit (RDI processing unit), packet header processing unit,
A sequence header processing unit and an aspect ratio information processing unit are provided.

Among the execution results of the MPU, the contents to be notified to the user are displayed on the display unit 43 of the DVD video recorder or OSD (on-screen display) on the monitor display. Further, the microcomputer block 30 has a key input section 44 (including a remote control system) for giving an operation signal for operating this apparatus.

The microcomputer block 30
However, the timing for controlling the optical disc drive unit 1001, the data processor unit 1003, the encoder unit 50 and / or the decoder unit 60, etc. can be executed based on the time data from the STC (system time clock) 38. Recording and playback operations are usually STC3
Although it is executed in synchronization with the time clock from 8, the other processing may be executed at a timing independent of the STC 38.

Next, the decoder section 60 will be described. The decoder unit 60 separates and extracts each pack from a DVD-format signal having a pack structure, a memory used when performing pack separation and other signal processing, and main video data (video) separated by the separation unit. Video decoder (V-D) for decoding pack contents), SP decoder (SP-D) for decoding sub-picture data (contents of sub-picture pack) separated by separators, and audio data separated by separators (Contents of audio pack)
It has an audio decoder (A-D) for decoding. Further, it is provided with a video processor (V-PRO) which appropriately synthesizes the decoded sub-picture data with the decoded main-picture data, and superimposes a menu, a highlight button, subtitles, and other sub-pictures on the main picture. .

The output video signal of the decoder section 60 is input to the frame memory control section 71. The frame memory control section 71 can also combine the text data from the microcomputer block 30 and the video signal. The frame memory control unit 71 also has a line (not shown) for directly taking in signals from the TV tuner unit 42 and the A / V input unit 42.
Is also connected. Frame memory control unit 71
A frame memory 72 used as a buffer is connected to. If the output of the frame memory control unit 71 is a digital output, an interface (I / F)
It is output to the outside via (not shown), and in the case of analog output, it is output to the outside via the digital-analog converter 74.

In audio, the output audio signal from the coder (A-D) is a digital-to-analog converter (D / A).
Is converted to analog and output to the outside.

Although not shown, a selector is provided in the output signal path for outputting the audio signal. The selector is the microcomputer block 30.
Controlled by the select signal from. As a result, when the selector directly monitors the digital signal from the TV tuner unit 42 or the A / V input unit 41, the encoder unit 5
It is also possible to directly select and output a signal that passes 0.

Note that the formatter of the encoder section 50 creates each segmentation information during recording and periodically sends it to the MPU of the microcomputer block 30 (information at the time of GOP head interrupt). As the isolation information, V
There are the number of OBU packs, the end address of the I picture from the beginning of the VOBU, the playback time of the VOBU, and the like.

Further, the formatter of the encoder section 50 uses the information from the aspect information processing section M when recording starts.
Send to PU, MPU sends VOB stream information (STI)
To create. Here, the STI stores resolution data, aspect data, etc., and at the time of reproduction, each decoder section is initialized based on this information.

Here, in a real-time recording / reproducing apparatus using a DVD, a point to be noted is that, when accessing data, a minimum is necessary for continuous reproduction during the access (seek). Consecutive sectors are needed. This unit is called CDA (Contiguous
Data area). In other words, it is a data size that is agreed in advance to realize seamless reproduction.

It is advantageous that this CDA is in ECC (error correction code) block units. Therefore, the CDA size is set to a multiple of 16 sectors, and the file system records in this CDA unit. The data processor unit 1003 receives data in units of VOBU from the formatter of the encoder unit 50 and supplies data in units of CDA to the disk drive unit 1002.

Further, when the MPU of the microcomputer block 30 creates the management information necessary for reproducing the recorded data and recognizes the data recording end command,
The created management information is sent to the data processing unit 1003. As a result, the management information is recorded on the disc. Therefore, when the encoding is being performed, the MPU of the microcomputer block 30 receives information in units of data (division information or the like) from the encoder unit 50. Also, the MPU of the microcomputer block 30 recognizes the management information (file system) read from the disc at the start of recording, recognizes the unrecorded area of the disc, and determines the data recording area as the data processor unit 100.
It is set to the disk through 3. Further, the MPU of the microcomputer block 30 is
Various management information read from the disc can be analyzed and recognized, and control such as initial setting of the decoder 60, copy inhibition, and permission can be performed.

The recording medium described above roughly includes management information and content information (information such as video and audio) as information for recording and reproduction. Then, the recording areas of the information related to copy protection are secured in the management information and the content information, respectively.

Information relating to copy protection is also present on the information recording / reproducing apparatus side and is present as unique device key information A and B in the encryption / decryption units 2002 and 1002, respectively. The unique device key information A and B are basically unique key information of this information recording / reproducing apparatus, and A and B are exactly the same.

The recording medium handled by the device of the present invention may be a DVD-ROM, a DVD-RW, a DVD-R, or a large capacity memory. It may also be a composite memory chip.

FIG. 2 shows the encryption / decryption unit 200.
2 and 1002 and the track buffer 1100 of the data processor unit 1003.

The encryption / decryption units 2002 and 1002 are
The contents (AV data part, SP data other part) are encrypted and decrypted. The management information is not encrypted.

Now, the case where the record data is recorded on the hard disk or the optical disk will be described. The record data is input to the track buffer 1100 of the data processor 1003 and given to the encryption / decryption unit 2002 or 1002. If the recorded data is the target of copy prohibition here,
The encryption / decryption unit 2002 or 1002 performs an encryption process using a scramble key (created using a device key), and the encrypted data is recorded on a hard disk or an optical disk.

Next, the case where the encrypted data recorded on the hard disk or the optical disk is reproduced will be described. The data read from the hard disk or the optical disk is subjected to a decryption process using a scramble key (created using a device key) in the encryption / decryption unit 2002 or 1001, and the data processor unit 1003. Are taken into the track buffer 1100.

Here, the hard disk side encryption / decryption unit 2002 employs a CSS (content scramble system), creates a scramble key based on this, and performs scramble and descramble. The optical disk side encryption / decryption unit 1002 employs a CPRM (copyright management) system, creates a scramble key based on this, and performs scrambling and descrambling.

FIG. 3 shows an example of the data structure of unique device keys A and B which are key information used for encryption / decryption. These are keys that are unique to each recording / reproducing apparatus, and are encrypted according to a certain rule at the time of manufacture and stored in the storage unit. First, as a data block, a device key serial number in an unencrypted state and its I
Storage block 81 in which D is described and RA in encrypted state
There are an M device key storage block 82 and an encrypted hard disk device key storage block 83. These encrypted device keys are unique keys for each recording / reproducing apparatus, and are encrypted according to a certain rule at the time of manufacture and stored in the storage unit.

In the present invention, in particular, the unique device keys A and B are unique to the set written in advance at the time of manufacture and have the same contents. For this purpose, the following functions can be provided.

That is, at least a part (ID) of the device key read from each storage unit at the time of starting the apparatus is compared,
Detects a match or a mismatch. Then, if a mismatch is detected by this detection processing, the operation of the device is limited.

FIG. 4 shows the operation. When the device is started, the unique device key information A on the hard disk side is read (step B1). Then, the head ID of the device key information is ticked from the unique device key information A (step B2). This tick is
For example, since the ID of the device key information is fixed,
You can easily tick whether the ID is normal (step B3). If the tick result ID is invalid, it is determined that the unique device key information A itself on the hard disk side is abnormal (step B4).

If the above ID is normal, then the unique device key information B on the optical disk side is read (step B5). Then, the head ID of the device key information is ticked from the unique device key information B (step B6). Since the ID of the device key information is also fixed in this tick, it is a tick indicating whether the ID is normal (step B7). If the tick result ID is invalid, it is determined that the unique device key information B on the optical disc side is abnormal (step B4).

Next, if the above ID is normal, the device key is read from each storage block of the device key information A and B and compared (step B8). If the two match according to this determination (step B9), the unique device key information in the recording / reproducing apparatus is determined to be normal (step B10). If they do not match, it is determined that one of the unique device key information A or B is abnormal (step B4).

As described above, in the device of the present invention, the unique device key information A and B having the same contents are stored in advance in both the encryption / decryption units 2002 and 1002. Then, both IDs are ticked and the device keys of both are compared.

As a result, if any one of the unique device key information is illegally rewritten or invalidated, it will be immediately known when the apparatus is started. Further, the apparatus of the present invention does not need to be provided with a dedicated memory for storing the device key information as a reference for comparison.
This is because the unique device key information A and B having the same contents are stored in advance in both the hard disk side and the optical disk side encryption / decryption units 2002 and 1002, respectively.

Next, when the unique device key information is found to be abnormal as a result of the above processing, the apparatus of the present invention limits the operation of the apparatus. The contents of this restriction can be dealt with as follows.

(1) When the unique device key information is abnormal during recording or reproduction, a warning is displayed and the operation of the apparatus is stopped. Alternatively, (2) At the time of recording: A warning is displayed through the display unit 43 or the display on the video output side, and only the source having no copy prohibition information can be recorded.

(3) At the time of reproduction: A warning is displayed through the display unit 43 or the display on the video output side, and only a source without copy protection (copy prohibition information) can be reproduced, and a source having copy prohibition information is reproduced. Prohibit playback operation.

The judgment as to whether copying is prohibited or copying is free can be made by the microcomputer block 30 analyzing and recognizing the unencrypted reproduction management information.

Next, the encryption / decryption related information (for example, media ID, media block key, disk scrambling key, copy control information, etc.) arranged in the management information and the content information roughly classified will be described. .

FIG. 5 shows a volume space of a DVD-standard optical disc.

The volume space is roughly divided into a lead-in area, a user data area and a lead-out area. There are a burst cutting area and an embossed area in the Reedon area.

In the burst cutting area (BCA), the application ID, version, data length,
A manufacture ID and a media identifier (MID), which is a serial number, are recorded when the disc is manufactured.

A control data area is secured in part of the embossed data area. In the present invention, this control data area is used as a media key block (MKB), and media key blocks # 1, # 2, ... Are set therein. For example, 16 ECC blocks are used for one media key block. The media key block (MKB) is unique to the disc.

In a CPRM (copyright management) system, a scramble key is created using the above three MIDs, MKBs, and device keys (non-encrypted) and used in the optical disk encryption / decryption unit 1002. .

FIG. 6 shows a video manager information management table (VMGI_MA) in the DVD standard.
T) is shown in a simplified manner. This management table contains
As disc content management data, various management information is described starting with a video manager identifier (VMG_ID). For example, the end address of the video manager that is the entire management information, the end address of the video manager information that is part of it, the resume mark information (information that indicates the position to resume after the interruption),
Disc representative image information (information indicating the reproduction position of the representative image), original program chain (ORG_PGC
The start address of IT (the chain indicating the playback order of contents), the start address of the user-defined program chain (UD_PGCIT) (the chain indicating the playback order of the contents set by the user), and the writing position of the manufacturer information (MFIT) The start address and the like to be shown are described.

A reserved area for copy protection is secured in the disc content management data.

In the present invention, the DISC scrambling key # 1 is written in this reserved area. At the beginning or immediately before the area of the disk scramble key # 1, one bit is used to turn on (O
N) / OFF (OFF) information is provided. When this ON / OFF information is “0”, the disk scramble key #
When the on / off information is “1”, it means that the disk scramble key # 1 exists.

The above-mentioned disk scramble key # 1
Does not exist if the disc is a virgin disc. However, once it is used and the scramble key by the CPRM described above is created, this scramble key is written and the disc scramble key # 1 is written.
Becomes

When the disc is a virgin disc, the information recording / reproducing apparatus creates a scramble key by the CPRM described above and scrambles the source to record information. However, when the disc scrambling key # 1 is recorded on the disc,
This key # 1 is used as one of the scramble key for recording and the descramble key for reproducing. As a result, even if the optical disc is recorded by another information recording / reproducing apparatus X, the information recording / reproducing apparatus Y can reproduce the data.

The above-mentioned disk scramble key # 1
Is information included in the management information base in a large sense. Next, the copy related information included in the content base will be described.

Before that, the relationship between the management information of the real-time DVD and the video object which is the content will be briefly described.

In FIG. 7, the video object (VOB) will be described first. VOB is VR_MOVIE. It is called a VRO file.
A video file has a hierarchical structure, and one file is composed of one or a plurality of VOBs (video objects), and one VOB is composed of one or a plurality of VOBUs (video object units). VOB
U is composed of a plurality of packs. As the plurality of packs, there are RDI packs, V (video) packs, A (audio) packs, and the like. Sub-picture pack (SP pack)
May exist.

The RDI pack is called a unit control information pack, a navigation information pack, or a real-time data information pack (RDI_PCK). This pack includes information indicating the start time at which the first field of the VOBU to which the pack belongs is reproduced, information indicating the recording time of the VOBU, manufacturer information (MNFI), and the like. It also includes display control information (DCI) and copy control information (CCI). The display control information indicates aspect ratio information, subtitle mode information, and film camera mode information. The copy control information (CCI) includes copy permission information (0,0) or copy prohibition (copy prohibition permission) information (1,1).

The V pack is obtained by compressing video data in the MPEG2 system and is composed of a pack header, a packet header and a video data section. In the A pack, audio data is, for example, linear PCM or MPEG,
Alternatively, it is processed by a method such as AC3 and is composed of a pack header, a packet header, and an audio data section.

The management information is called the video manager (VMG) as described above, and the program chain (PGC) for managing the data reproduction order is defined in the management information. A cell (Cell) is defined in the program chain (PGC), and a video object (VO) as a target to be reproduced is further provided in the cell (Cell).
Video object information (VOBI) which is the information of B)
Is defined. The portion in which the specific information of PGC is recorded is the program chain information (PGCI) portion. P
There are two types of GCI, one is the original PGC.
I (ORG_PGCI) and the other is a user-defined PGC table (UD_PGCIT).

In the VOBI, the time map (TMA
P) is described, and this TMAP can specify the VOBU that constitutes the VOB corresponding to the VOBI. The link from the cell to the VOBI is specified by the logical address. Further, the TMAP information is linked to the VOB and the VOBU based on the stream number of the VOB, the number of VOBUs in this VOB, the entry number for each VOBU, and the logical address to each target VOBU.

The above RDI pack will be described below.

FIG. 8 shows the data structure of the real-time information (RDI) included in the above-mentioned real-time data information pack (RDI_PCK). RDI includes pack header, system header, packet header, PE
It includes information such as S packet length. Further, it includes RDI general information (RDI_GI), display control information and copy control information (DCI_CCI), and manufacturer information (MNFI).

RDI_GI is the VO to which this RDI belongs
It includes the presentation start time (VOBU_S_PTM) and the VOBU recording time (VOBU_REC_T) of the first video field of the BU.

The display control information and the copy control information (DCI_CCI) correspond to the DCI status (DCI_S).
S), CCI status (CCI_SS).

When DCI_SS is "00b", it indicates that valid aspect ratio information does not exist in DCI, and when it is "01b", it indicates that only valid aspect ratio information exists in DCI. , "11" indicates that effective aspect ratio information, subtitle mode information, and film camera mode information are present in the DCI.

As shown in FIG. 9, CCI_SS is "0".
"00" means that there is no valid copy control information in the CCI, "001" means that only the source information does not exist, and "010" means that APS ( It means that only analog protection information exists. When it is “011”, only valid APS information and source information exist. When it is “100”, only valid CGMS (copy generation management system) information exists. When it is “101”, only valid CGMS and source information exist, when “110”, only valid CGMS and APS information exist, and “1”
When it is 11 ″, it means that only valid CGMS, APS information, and source information exist.

FIG. 10 shows the contents of the above DCI. The display control information (DCI) consists of corresponding video aspect ratio information: 4 bits, subtitle (subtitle) information: 2 bits, reservation: 1 bit, and film camera mode: 1 bit.

When the video aspect ratio is 4: 3, 000
It is 0001 when 0, 16: 9. When the source is letterbox, values other than 0000 and 0001 are used, and the encoded video is 4: 3. Regarding subtitle information, it is 01 when the subtitle is located inside the image and 10 when the subtitle is located outside the image. The film camera mode information is 1 in the camera mode and 0 in the film mode.

FIG. 11A shows the contents of the copy control information CCI. Copy Generation Management System (CGMS) information
2 bits and analog copy system table (APS
TB) information is included.

FIG. 11B shows the contents of CGMS. "00" indicates that copying is permitted without restriction, "01" and "10" indicate that the condition is not used, and "11" indicates that no more copying is possible. Indicates that it is not permitted (copy prohibited).

FIG. 11C shows the contents of APSTB. When "00", APS is off (no protection is applied), when "01", APS type 1 is applied, and "1"
A value of "0" indicates that APS type 2 is applied, and a value of "11" indicates that APS type 3 is applied.

As described above, the DVD standard includes restriction information regarding copying. It also contains information on whether scrambling is performed.

Therefore, when the microcomputer block 30 determines and recognizes this restriction information and records the information on the hard disk or the optical disk according to the content, the encryption / decryption units 2002, 1002
It will be decided whether or not to perform the encryption process. CG
If the MS is copy-once, scramble to C
Upgrade GMSA content to Copy Never. Or C
If the GMS indicates that copying is prohibited, recording on the hard disk or optical disk is prohibited, and only reproduction is possible.

When APSTB indicates that analog scrambling is performed, recording on a hard disk or an optical disk is prohibited, and only reproduction is possible.

FIG. 12 also shows the recording positions of encrypted and non-encrypted information existing in the content information. The encryption / non-encryption here means the encryption / non-encryption of the content in the packet.

FIG. 12 shows the contents of packet headers included in each of the video pack, audio pack and sub-picture pack. The pack has a pack header. A system clock reference is described in the pack header, is compared with the system clock in the device, and is used as timing information handled in pack units in the device. A packet header is present after the pack header, and then video data, audio data, or sub-picture data is present. The pack header and packet header parts are not encrypted. However, it is possible to determine whether the video, audio, or sub-picture data compressed by the MPEG system is encrypted or non-encrypted according to the PES scrambling control information included in the packet header.

The packet header describes a packet start code, a video stream, an audio stream, and a stream ID which is identification information of the sub-picture stream. Also, in the packet header, PES (packet elementary stream) scrambling control information (basically indicating whether or not scrambled), copyright information, and information indicating whether it is an original or a copy can be arranged. Has become. Furthermore, the playback output can be streamed to the associated stream (video, audio,
Presentation time information (time stamp) for synchronously outputting sub-pictures is described.

Therefore, the microcomputer block 30 of the information recording / reproducing apparatus analyzes and recognizes the above PES scrambling control information, and the encryption / decryption unit 1
At 002 it can be decided whether to scramble or descramble. If the PES scrambling control information indicates encryption, the content (video or audio or sub-picture) in the subsequent packet
Is encrypted. Therefore, in order to decrypt and view this content, a separate decryption key is required.

In the present invention, however, the above-mentioned PES scrambling control information is referred to for encryption / recording on the optical disc or reproduction from the optical disc.
When deciding whether or not to perform scrambling in the decoding unit 1002, it can be used by referring to the above PES scrambling control information.

In this case, since the PES scrambling control information is described in the packet header, scrambling and descrambling can be performed in packet units.

In the encryption / decryption units 2002 and 1002, there are the following elements for determining whether or not scrambling is performed. This element can be effectively used when there is an external input.

FIGS. 13A to 13D show the data structure of the copy generation management system (CGMS) currently specified for broadcast signals.

Usually, data called VBID may be multiplexed in the vertical blanking period (VBI) of a broadcast video signal.

This VBID is used as information indicating what kind of signal the multiplexed video signal is. The broadcast signals and information include the following.

(A) Squeeze (or full mode signal)
→ This is 525 lines, aspect ratio 1 on the standard TV signal format with 525 lines and aspect ratio 4: 3.
A signal carrying information on a 6: 9 image.

(B) Letterbox signal with aspect ratio 4: 3 → This is 525 lines, aspect ratio 4: 3
The wide image signal has a non-image part at the top and bottom and a main image part at the center.

(C) 3D information → This is information such as a signal format related to 3D stereoscopic display.

(D) Pull-down information-> This is information for identifying whether or not an image is from the same frame when converting 24 frames of video or 30 frames of CM film into a video signal.

(E) Cue information → This is one or more index information that serves as a mark for the position to be reproduced on the VTR or the like.

The above information is the 20th line and the 283rd line.
It is multiplexed on the line. Of the first word (4 bits) (called word 0) of VBID, when the first 2 bits are 00, it means that the image or information has an aspect ratio of 4: 3, and when it is 10, the aspect ratio is 16 : 9 means a squeeze signal of an image, 01 means a letterbox signal having an aspect ratio of 4: 3, and 11 means no particular regulation.

Therefore, the aspect ratio of the video signal can be detected by detecting the first 2 bits of word 0 of the VBID.

However, when the 4 bits (word 1) arranged next to word 0 (2 bits) are all 0, this V
BDI information means that it is used as CGMS.

CGMS in the broadcast signal will be described below. This CGMS is inserted in a specific line of the vertical blanking period of the television signal, for example, in the 21st or 20th horizontal period (see FIG. 12A),
This is 20-bit information (see FIG. 12B). The first two bits of the first and second are used as word 0,
The next 3rd to 6th 4-bit word 1 is 0000
And indicates that copy generation control information is present next. Further, the following 7th to 14th are defined as word 2. The following 15th to 20th are CRCCs, that is, error collection codes.

Here, the 7th and 8th 2 bits are CGM.
It is S data and is defined as shown in FIG. A value of 0,0 means that copying is possible without restrictions, a value of 1,0 means that only one generation can be copied, and a value of 1,1 means that copying is prohibited. means.

Therefore, on the recording device side, this CGMS
Referring to FIG. 12, when recording the video signal on the recording medium, it is possible to take measures as shown in FIG. That is, the 7th and 8th bit contents are 0,0
When it is (copy permission information), the CG shown in FIG.
Set the contents of MS to 0, 0 (copy permission information), and
When the 7th and 8th bit contents are 1,0 (copy permission information for only one generation) or 1,1 (copy prohibition information), the CGMS in the RDI shown in FIG. Set the contents to 1, 1 (copy prohibition information). Further, the PES scrambling control information of each packet header in the VOBU having the RDI at the head is also unified so as to have the same content as the CGMS content in the RDI.

Therefore, when the recording / reproducing apparatus for processing the input television signal described above refers to this word 0 and records the video signal on the recording medium, the recording / reproducing apparatus shown in FIG.
Actions are taken according to the contents shown in (C).

Further, in the DVD standard, the copyright management information (CPR_MI) is set to be added to the ECC block.

The copyright management information (CPR_MI) will be described.

In the signal processing device for DVD, 2048 bytes of digital main data are used as a unit and a sector in which identification data (ID) and the like are added to this main data is processed. Sectors are called "data sectors", "recording sectors" and "physical sectors" according to the stage of signal processing.
The "data sector" has a total of 12 bytes of main data 2048 bytes, identification data (ID), ID error detection code (IED), and copyright management information (CPR_MAI), and error detection code (EDC) 4 bytes for the main data. Consists of.

FIG. 14 illustrates these processing procedures. Main data 2048 bytes with ID and IE
D and CPM_MAI are added (steps A1, A2,
A3), the error detection code EDC of the main data is also generated and added to form a data sector before the main data scramble process (step A4). The initial value for scrambling is dictated by the bit content of some of the IDs. By the scrambling process, the scrambled data sector is obtained (step A5).

As a result, in the data sector, as shown in FIG. 15, the main data is 2048 bytes, the identification data (ID) is 4 bytes, the ID error detection code (IED) is 2 bytes, and the copyright management information (CPR). 6 bytes of MAI) and 4 bytes of error detection signal (EDC) are included.

The scramble process for the main data at the above stage is performed to prevent the same pattern of data from being repeated. For example, when all the main data is "0" data, the recording signal recorded on the recording medium has the same pattern repeated. Then, when the recording medium is a disk or the like, adjacent tracks may have the same pattern. In such a case, a problem occurs such that the tracking servo error signal becomes undetectable due to crosstalk. In order to prevent such repetition of the same pattern, the main data is scrambled.

Thereafter, a cross Reed-Solomon error correction code (ECC) is generated and added to the 16 scrambled data sectors (step A6).
The recording sector is a sector after ECC addition, and is a data sector to which the error correction code PI and the error correction code PO are added (step A7). The physical sector has a sync code (SYNC code) at the beginning of every 91 bytes of the recording sector.
Is added, and the sector is further subjected to 8/16 modulation (step A8).

Subsequently, the structure of the data sector of the DVD will be further described with reference to FIG.

The data sector includes 2064 bytes including 2048 bytes of main data, that is, 172 bytes × 12.
Composed of lines. That is, the data sector has 2048 bytes of main data, 4 bytes of identification data (ID), and ID.
Error detection code (IED) is 2 bytes, copyright management information (CPR 6 bytes of MAI) and 4 bytes of error detection code (EDC) are included.

The structure of the ECC block will be described with reference to FIG.

The data block is formed as 172 columns × 192 rows in which 16 data sectors of 172 bytes × 12 rows are gathered. An error correction code is added to this 172 columns × 192 rows. Ie 1 for each of the 172 columns
A 6-byte error correction code PO is generated and added.
Each column of one PO series has 192 bytes + 16 bytes,
That is, it is composed of 208 bytes. Next, the error correction code PI of 10 bytes is generated and added to all the 208 rows including the row of the error correction code PO. Each row of one PI series is composed of 172 bytes + 10 bytes, that is, 182 bytes. Error correction code PI, PO
182 columns × 208 rows to which is added are formed as one ECC block.

Next, the structure of the recording sector will be described with reference to FIGS. 17 and 18.

With respect to the ECC block of 208 rows × 182 columns, 16 rows of the error correction code PO are inserted every 12 rows, and the rows are rearranged as shown in FIG. 18 ( Line interleave). Therefore, the ECC block after row interleaving is data (12 rows) +
It consists of 16 13-row × 182-byte portions of PO (1 row).

As shown in FIG. 17, one recording sector is 13 rows × 182 of data (12 rows) + PO (1 row).
This indicates a sector composed of bytes, which means that the ECC block after row interleaving is composed of 13 recording sectors, as shown in FIG.

The physical sector is a recording sector (2366 bytes) of 13 rows × 182 bytes, which is sequentially modulated row by row from 0 row while adding a sync (SYNC) code to the beginning of every 91 bytes of each row. is there. The 91-byte data with the SYNC code added to the beginning is called a SYNC frame. Therefore, the physical sector is 13 sets x 2 SYN
It is composed of C frames.

Therefore, the information recording / reproducing apparatus can also monitor CPR_MAI according to the content level. When copy prohibition information is stored in CPR_MAI, the encryption / decryption units 2002 and 1002 can determine whether or not to perform scrambling.

Further, according to the present invention, the CSS (content scramble system) and the CPRM system are respectively shown in FIG.
2 is adopted by the encryption / decryption units 2002 and 1002,
Moreover, it is noted here that the device key information A and B are the same. In other words, on the hard disk side,
Create a scramble key using the serial number of the hard disk and the device key (non-encrypted state),
The recorded data is scrambled based on this scramble key.

On the other hand, on the optical disc side, a CPRM (copyright management) system is adopted, and MID, M
The scramble key created using the three keys of KB and device key (non-encrypted state) is used in the optical disc encryption / decryption unit 1002.

The following can be considered as illegal acts. For example, if the device key information is illegally decrypted, it may be meaningless to record the scrambled data, which is originally copy-prohibited, on a hard disk or an optical disk.

Regarding the hard disk side, in the copy mode, for example, the microcomputer block 3
0 indicates that if the data to be played is copy protected,
Device key information A for the descramble key output section
Don't give. However, if the device key information A (unauthorized decryption) is forcibly given from the outside, the descramble key can be obtained. Then, it is conceivable to record the descrambled data on the optical disk. When such a fraudulent operation is performed, since the optical disk is removable, it is possible to copy the data, which is originally prohibited from copying, to many optical disks.

Further, in the copy mode in which the reproduction data from the optical disc (the data originally forbidden to copy) is to be recorded in the hard disk, the microcomputer block 30 does not descramble. For this reason, the content is read into the track buffer in an encrypted state and becomes meaningless data. However, due to an illegal act, the media ID (MID), the media key block (MKB), and the device key were used to create them (disk scramble key = descramble key).
Is decrypted and given from the outside, the data read from the optical disc can be descrambled. In such a case, it is possible to record (copy) the content that is originally prohibited from copying on the hard disk. Then, as described above, it becomes possible to copy the content, which is originally prohibited from copying, onto a large number of optical disks.

Therefore, in the apparatus of the present invention, even if the device key information A, B is decrypted by the above-mentioned illegal act, a countermeasure is taken so that the illegal copy can be prevented.

That is, according to the present invention, when the recorded optical disk is reproduced, the above-mentioned disk scrambling key #
The scrambling is performed by the decrement using 1. The disc scrambling key # 1 is created by using the media ID (MID), the media key block (MKB), and the device key (non-encrypted state) when the virgin disc is handled.

In the apparatus of the present invention, when the virgin disc is handled and initialized as described above, and the new disc scrambling key # 1 is created, it is set as the device key information B, and this device key is set. The information B is updated as the device key information A on the hard disk side.

Then, since the device of the present invention employs the method of comparing the device key information A and B, the device key information A is always used after the virgin disk is handled.
And B will match.

That is, even if the device key information A or B is decrypted by a fraudulent act, it means that the device key information decrypted by a fraudulent act is useless after the virgin disc is handled as described above. To do.

Next, as described above, the device key information A,
A scramble process on the hard disk side and a scramble process on the optical disc side after the update of B (the process of replacing the predecessor device key information with the new device key information) are performed will be examined.

First, for the optical disc side, the above-mentioned C
Since the PRM method is adopted and the device key information B is used as the scramble key, scrambling and descrambling can be performed without any problem.

On the other hand, if it suits the hard disk side, CS
S is adopted. This method uses a scramble key (or descramble key) created from the device key (non-encrypted state) and the hard disk serial number. Therefore, the updated device key information A
The device key in the non-encrypted state can be decrypted from (= device key information B). That is, the media ID (MID), the media key block (MKB), and the device key (non-encrypted state) can be separated from each other by a calculation formula that is the reverse of that used when the device key information B and A is created. In CSS, a device key (non-encrypted state) and a hard disk serial number are required in CSS, and thus both can be used to create a scramble key (descramble key). Therefore, recording on the hard disk and descrambling of previously recorded data can be performed without any problem.

The present invention is an optical disc (DVD-RAM, DVD-RW, DVD) which conforms to the DVD video standard.
-R) and the like, as well as the optical disc of the DVD audio standard. D
Regarding recording / playback of VD audio, the CPPM method is adopted as a scramble key. Therefore DV
When an optical disc of the D audio standard is loaded in the device, the information recording / reproducing device uses the media ID or the like to determine the
It is designed to obtain a scramble key based on M.
Of course, it is easy to set the software of the microcomputer block of the information recording / reproducing apparatus so that it can handle both DVD audio and DVD video.

[0148]

As described above, according to the present invention, when the virgin recording medium is initialized, the device key information A, B of the encryption / decryption unit of each recording / reproducing unit is replaced with the new device key information. Moreover, even if the device key information held before is stolen and opened, the security is maintained.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an information recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a structural explanatory view showing a main part of the present invention.

FIG. 3 is an explanatory diagram showing an internal data structure of device key information A and B.

FIG. 4 is a flowchart shown to explain device key information tick processing of the present invention.

FIG. 5 is an explanatory view of a data structure shown for explaining scramble-related information in a lead-in area inside the disc.

FIG. 6 is an explanatory diagram of a data structure shown for explaining scramble-related information included in management information in a user data area inside the disc.

FIG. 7 is an explanatory diagram of a data structure shown for explaining the relationship between the management information inside the disc and the content.

FIG. 8 is R, which is management information included in a part of the content.
Explanatory drawing of the data structure of a DI pack.

9 is an explanatory diagram of a data structure of information indicating the presence / absence of copy control information in FIG.

10 is an explanatory diagram of a data structure showing the contents of the display control information of FIG.

11 is an explanatory diagram of a data structure which is the content of the copy control information of FIG.

FIG. 12 is an explanatory diagram showing scrambling control information in a packet.

FIG. 13 is an explanatory diagram of CGMS information in a broadcast signal.

FIG. 14 is an explanatory diagram showing a process of converting a data sector adopted in the DVD video recording standard into a recording sector.

FIG. 15 is an explanatory diagram of a data sector structure.

FIG. 16 is an explanatory diagram showing the structure of an ECC block.

FIG. 17 is an explanatory diagram of the configuration of one recording sector.

FIG. 18 is an explanatory diagram showing an ECC block for recording.

[Explanation of symbols]

30 ... Microcomputer block, 41 ... A / V tuner section, 42 ... TV tuner section, 50 ... Encoder section, 60 ... Decoder section, 1001, 2001 drive section, 1002, 2002 ... Encryption / decryption section, 1003
... data processor section, 1004 ... temporary storage section.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/92 H04L 9/00 651 (72) Inventor Takahiro Kiyota 1-3-3 Shinmachi, Ome-shi, Tokyo Toshiba Digital Media Engineering Co., Ltd. Internal F-term (reference) 5C053 FA23 FA25 GB05 GB06 GB38 JA21 JA30 5D044 AB05 AB07 BC01 BC06 CC04 DE02 DE50 DE53 EF05 FG18 GK08 GK12 GK17 HL08 5J104 AA13 AA16 EA16 NA02 PA14

Claims (5)

[Claims] 1. An apparatus having a plurality of information recording / reproducing sections capable of writing information to and reproducing information from a recording medium, wherein the set is provided in each of the plurality of information recording / reproducing sections and is pre-written during manufacturing. In the storage unit that stores the front device key information of the same content in, and a means for creating at least the media information, the device key and the unique new device key information when the virgin medium of the predetermined recording medium is initialized, The information recording / reproducing apparatus having a scramble key management function, which has means for replacing all the front device key information of the information recording / reproducing unit of 1. with the new device key information. 2. A first and a second disk drive unit for writing data to the first and second recording media and for reading data from the first and second recording media, respectively, in a recording mode. , Encoding means for outputting the recording content data and management information thereof, and using part of the pre-stored device key information A stored in advance for the recording content data from the encoding means. To scramble and give it to the first disk drive unit together with the management information,
A first encryption / decryption unit for descrambling the encrypted content data from the first disk drive unit using a part of the prefix device key information, and from the encoding unit. To scramble the recording content data using the pre-stored device key information B and give it to the second disc drive unit together with the management information; A second encryption / decryption unit for descrambling the encrypted content data from the drive unit by using the front device key information B, and the first or second in the reproduction mode. Decoding means for decrypting the content data from the encryption / decryption unit, and at least the media when the virgin medium of the second recording medium is initialized. Means for creating unique new device key information B using the information and the device key, and the front device key information A, B possessed by the first and second encryption / decryption units as the new device key information. An information recording / reproducing apparatus with a scramble key management function, characterized in that it has means for replacing the contents of B. 3. The information with scramble key management function according to claim 2, wherein the first recording medium is a hard disk built in the apparatus, and the second recording medium is an apparatus removable optical disk. Recording / playback device. 4. Whether the copy information included in at least the management information is analyzed, and the scramble processing or the descramble processing of the first and second encryption / decryption units is executed according to the analysis result. First to decide whether or not
When the device is started up, the device key information A and the device key information B stored in the first and second encryption / decryption units are partially and / or entirely compared with each other and do not match. In this case, the information recording / reproducing apparatus with a scramble key management function according to claim 2, further comprising a second control section for limiting a recording / reproducing operation of the apparatus. 5. The scramble management function according to claim 2, further comprising means for stopping the operation of the device and obtaining a warning display when the comparison result by the second control unit is a mismatch. Information recording / reproducing device.