JP4740479B2 - Recording apparatus, recording method, and recording program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording apparatus for recording a copyright-protected content on an optical disc, and more particularly to an improvement in a case where different formats are used for consumer use and business use.
[0002]
[Prior art]
There are now two DVDs that have become typical optical discs, one for consumer use that can be obtained by general consumers and the other for professional use that can be obtained only by specific vendors. The latter DVD, for example, is a recording of movie content that is being shown at a box office, and is not intended for reproduction in a general household, but for reproduction in a public place. With the advent of commercial DVDs, the distribution of movie content for in-flight screening of aircraft is expected to shift from film and tape to DVD.
[0003]
Since DVDs contain the movie content that is currently showing, the copyright owner suffers a major disadvantage if an in-flight business DVD for an aircraft is stolen or lost. If the in-flight business DVD is in the hands of a third party due to theft or loss, the movie content recorded on the DVD will be screened without permission from the copyright holder in areas where future performances are scheduled. In some cases, the copyright holder is unable to obtain the planned box office. In addition, the airliner will be liable for damages caused to the copyright holder by theft and loss, which may exacerbate the relationship between the copyright holder and the airliner. Therefore, when recording an in-flight business DVD, the copyright holder encrypts the movie content different from the encryption applied to a consumer DVD, and the movie content recorded on the in-flight business DVD is stored in the commercial DVD player. Only to be played by. The consumer DVD player cannot play movie content recorded on this in-flight business DVD, so even if lost or stolen, it was recorded on the in-flight business DVD against the intention of the copyright holder. Movie content will not be shown.
[0004]
[Problems to be solved by the invention]
However, the considerations described above for copyright protection may cause unexpected troubles in the aircraft. In other words, it is considered that consumer DVDs are stored in addition to in-flight business DVDs inside the aircraft, and there may be a mixture of in-flight business DVDs and consumer DVDs in the aircraft. If such a mixed state is left unattended, an in-flight business DVD may be brought into the guest room instead of the screening room and loaded into a consumer DVD player installed in the passenger seat. If the consumer DVD player was unable to play the in-flight business DVD because the in-flight business DVD was encrypted with a different encryption method, the passenger in the passenger seat said, “This playback device is broken. There may be a fuss about. It seems uncomfortable for the airliner that the equipment seems to be out of order, and it is only a loss for the airliner that the crew is tossed by such a thing.
[0005]
It is an object of the present invention to be able to record copyright-protected digital content on an optical disc so as not to confuse the user even if the optical disc is loaded in a playback device different from the playback device that should be originally loaded. Is to provide a device.
[0006]
  In order to achieve the above object, a recording apparatus according to the present invention comprises:Encoding means for encoding content material and obtaining a plurality of video objects;
An encryption means for encrypting the video object in accordance with either a content protection system for normal publication or a content protection system for early publication;
Creating means for creating a video title set including a plurality of encrypted video objects and information indicating the playback order of the encrypted video objects;
When the content is normally released, only the first directory is generated on the optical disc, and when the content is released early, the first directory and the second directory are generated on the optical disc, and the video title set is recorded in the generated directory. Recording means,
The first directory is a directory having a directory name that is recognized as a storage location of a video title set by a consumer playback device, and includes a video title set and an index thereof.
The second directory is a directory having a directory name that cannot be recognized as a storage location of the video title set by the consumer playback device but can be recognized as a storage location of the video title set for early publication by the commercial playback device. Yes, it consists of a video title set and its index,
The recording means includes
When recording content for early publication, the second directory includes a video title set including a video object protected by a protection method for early publication and an index including menu data associated with the video title set. As well as recording
An index including a message that the consumer playback device cannot playback the video title set is recorded in the first directory;
When recording content for normal release, the first directory includes a video title set including a video object protected by a normal release protection method and an index including menu data associated with the video title set. To record
It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, an embodiment of a recording apparatus according to the present embodiment will be described with reference to the drawings. First, movie content recorded on a DVD by a recording device will be described. FIG. 1 is a diagram showing a movie content distribution schedule by a movie company. The movie content is released to the theater, and after 6 to 9 months, it is recorded on a consumer DVD and released to the private market. This makes consumer DVDs available for sale and rental in the private market. While commercial DVDs are released to the market quite late from the theatrical release, commercial DVDs are released to airlines and the like at the same time as theatrical release or during theatrical release period. For this reason, it can be said that the release time of commercial DVDs is much faster than the release time of consumer DVDs. The commercial DVD is released early in order to meet the industry's desire to show the same movie content that is shown in theaters in public places such as in airplanes. In this embodiment, a DVD for early release of movie content for business use is called EWCPS-DVD (Early Windows Contents Protection System-DVD), and a consumer DVD is called Contents Scramble System (CSS) -DVD. To do. The following explanation assumes that EWCPS-DVD will be released for the aviation industry.
[0008]
Movie content is handled in the form of titles on CSS-DVD and EWCPS-DVD. A collection of a plurality of titles sharing the same scene is called a video title set. For example, if there are various versions of movie content recorded on a DVD, such as “Theatrical release version”, “Director's cut version”, “Abbreviated version”, “Trailer”, etc., each will be treated as one title . In addition, since they share the same scene, they are treated as a video title set. How the video title set is stored in the DVD will be described with reference to FIG. The video title set includes a VOB set 1 and video title set management information 2 (including the PGCI table 3). The video title set is associated with a title set index 4 (including menu VOB5, FirstPlayPGCI6, and menu navigation PGCI7).
[0009]
The VOB set 1 includes a plurality of Video OBjects (VOB # 1, # 2, # 3, # 4, # 5,...). VOB is stream data obtained by multiplexing a video stream, an audio stream, and a sub-picture stream, and constitutes one scene shared among a plurality of titles. As shown by the dashed lines y1, y2, and y3, the video objects in the figure correspond to one scene of the movie content ("Meeting scene", "Recollection scene", "Climax scene" in the figure). It can be seen that it is. There are multiple audio streams and sub-picture streams that correspond to multiple languages such as English, Japanese, French, etc. Among these multiple audio streams and sub-picture streams, it corresponds to the language setting of the DVD player. Only things are selectively played.
[0010]
Video title set management information (Video Title Set Information (VTSI)) 2 is management information about a video title set, and includes a PGCI table 3.
The PGCI table 3 is a table in which a plurality of PGC information (Program Chain Information (PGCI # 1, # 2, # 3... #N)) is described. PGC information is information that defines the playback order of video objects in each title. As shown by being drawn with a broken line y4, the PGC information includes pointer information about the VOB and playback control information. The pointer information is information indicating what should be read out of the VOBs and the reading order of those VOBs. By this pointer information, which VOB is selected in each of the “theatrical release version”, “director's cut version”, and “shortened version”. The DVD player is instructed in what order it should be played back. The playback control information defines the accompanying control to be performed by the DVD player while the VOB is played in this playback order. The playback control information includes UOP information (User Operation Permission Information) that defines user operations specific to the playback order specified by the PGC information, playback order specific commands specified by the PGC information, and VOB playback. Command executed before (referred to as Pre Command), command specific to the playback order specified by PGC information, command executed after VOB playback (referred to as Post Command), etc. Link destination information that defines a link to the PGC information, CELL information that specifies an effective section in the VOB for each title, and the like.
[0011]
A title set index 4 (hereinafter simply referred to as an index) is an index for a video title set, and includes a menu VOB5, FirstPlayPGCI6, and menu navigation PGCI7. Hereinafter, menu VOB5 to menu navigation PGCI7 will be described.
The menu VOB5 is image data in which a menu is drawn. The contents of this menu VOB5 are shown in a frame w1. As shown in the frame w1, the menu VOB5 is used to select the title name ("Theatrical release version", "Director's cut version", "Abbreviated version", "Trailer") recorded on the DVD and to select each title. And a button to accept.
[0012]
FirstPlayPGCI6 (hereinafter abbreviated as FP_PGCI) is PGC information that is executed first when a DVD is loaded in a DVD player, and a jump (Jmp) command that designates menu navigation PGCI7 as a jump destination as shown by an arrow y5. Including.
The menu navigation PGCI 7 includes pointer information about the menu VOB 5 as indicated by an arrow y 6 and a plurality of Jmp commands to be executed when each button is confirmed in the menu drawn by the menu VOB 5. Since these Jmp commands specify the PGC information in VTSI 2 as the jump destination, the jump to each title is realized by the confirmation operation on the menu button.
[0013]
FIG. 3 shows how the title is reproduced by the Jmp command included in the above FP_PGCI6 and menu navigation PGCI7. As indicated by arrows (1), (2), (3), (1) Jmp command in FP_PGCI6, (2) Jmp command in menu navigation PGCI7, (3) VOB is processed through the process of pointer information included in PGC information. It is identified and the VOB is played back.
In the video title set having such a structure, the VOB is a digitized video stream, audio stream, and sub-picture stream itself. The VOB is encrypted and recorded on the DVD to protect the copyright. This VOB encryption is not performed by the recording device alone, but is realized by cooperation of the copyright holder, the key management center, and the recording device. The DVD player also performs a decryption process in order to decrypt the encrypted VOB. As mentioned above, the data structure of the video title set is not different between EWCPS-DVD and CSS-DVD, but the VOB copyright protection method is very different between EWCPS-DVD and CSS-DVD. . Hereinafter, with reference to FIG. 4, a process for encrypting the VOB will be described using CSS-DVD as an example. As shown in FIG. 4, the CSS-DVD encryption / decryption process consists of a copyright holder 10 that produces and distributes movie content, and a CSS key management center operated by a third party that realizes copyright protection. 11. A recording device 12 operated by a DVD manufacturer and a consumer DVD player 13 operated by a general consumer.
[0014]
The copyright holder 10 has movie material (video material in analog state, audio material, sub-video material), a content key dedicated to movie content, and a disc key unique to each DVD. In the creation, the movie material and the content key are delivered to the recording device 12, and the disc key and the content key are delivered to the CSS key management center 11.
[0015]
Next, the internal configuration of the CSS key management center 11 will be described. The CSS key management center 11 holds a master key in advance, receives a content key from the copyright holder 10, and encrypts the content key using a disk key created by the copyright holder 10. 21 and a disk key encryption unit 22 that encrypts the disk key using a master key, and the content key encryption unit 21, the disk key obtained by encryption of the disk key encryption unit 22, and the content key Are delivered to the recording device 12.
[0016]
The recording device 12 includes an MPEG encoder 51 that obtains an original VOB by encoding a movie material, and a scrambler 52 that encrypts the VOB using a content key. A scrambled VOB (scrambled VOB) is provided. Record on DVD.
The recording device 12 receives the content key encrypted by the content key encryption unit 21 from the CSS key management center 11 and records it in the sector header area. Further, the recording device 12 receives the disk key encrypted by the disk key encryption unit 22 from the CSS key management center 11 and records the encrypted disk key in the lead-in area. The sector header area and the lead-in area are accessible only to the DVD player and cannot be accessed by devices other than the DVD player. By recording the encrypted content key and the encrypted disc key in these areas, the scramble is performed. The de VOB is decrypted only by the DVD player.
[0017]
Next, the configuration of the consumer DVD player 13 will be described. The consumer DVD player 13 reads the encrypted disk key recorded on the DVD and decrypts it using the master key unique to the consumer DVD player 13 to obtain the original disk key. The content key decrypting unit 26 that reads the encrypted content key from the DVD and decrypts the content key using the disc key obtained by the disc key decrypting unit 25, and the scrambled VOB from the DVD Decoding using the content key to obtain the original VOB, the descrambler 27 for decoding the VOB obtained by the descrambler 27, obtaining the video signal and audio signal, and reading VTSI2 from the DVD, A system control unit 29 for instructing to sequentially read VOBs based on the PGC information included in the
The above is a diagram showing the CSS-DVD encryption / decryption process. Next, an outline of the EWCPS-DVD encryption / decryption process will be described.
[0018]
EWCPS-DVD and CSS-DVD are recorded with the content key encrypted (1), the content key used for encryption is recorded on the DVD (2), and The point (3) in which this content key is encrypted is common. The differences are as follows. In CSS-DVD, a disc key for decrypting the content key is recorded on the DVD and supplied to the consumer DVD player 13. On the other hand, in EWCPS-DVD, the decryption key for decrypting the content key is called a device key, and the device key is written on an IC card unique to the business DVD player and supplied to the business DVD player. .
[0019]
The disc key in CSS-DVD depends on the DVD but not on the consumer DVD player 13, and once generated, it is not generated again. On the other hand, the device key in EWCPS-DVD depends on the professional DVD player and is generated any number of times. In EWCPS-DVD, VOBs cannot be played without an IC card, and when a device key is revealed, the device key can be recreated, so it can be said that VOB playback is strictly controlled. Note that device key encryption is based on the public key encryption method, and the key used for encryption (public device key) is different from the key used for decryption (secret device key). I want.
[0020]
The process of encryption and decryption in EWCPS-DVD will be specifically described. FIG. 5 is a diagram showing an encryption / decryption process in EWCPS-DVD. This process consists of a copyright holder 10 that produces and distributes movie content, a recording device 12 operated by a DVD manufacturer, an EWCPS key management center 14 operated by a third party that realizes copyright protection, an aircraft operator This is realized by the business DVD player 15 operated by the above. It can be said that the copyright holder 10 has content keys and movie content materials and supplies them to the EWCPS key management center 14 in the same manner as the system of FIG. The recording device 12 is the same as that shown in FIG. However, the configurations of the EWCPS key management center 14 and the commercial DVD player 15 are significantly different from those of the CSS key management center 11 and the consumer DVD player 13 in FIG.
[0021]
First, the internal configuration of the EWCPS key management center 14 will be described. As shown in FIG. 5, the EWCPS key management center 14 includes an initial public device key database 31, a device key pair generator 32, a public device key database 33, a content key encryption unit 34, and a device key encryption unit 35. .
The initial public device key database 31 is a database that stores x initial public device keys (x is the number of commercial DVD players). Like the device key, the initial public device key is a public key used in the public key encryption method, and is used as a pair with the initial secret device key stored in each of the x business DVD players. The initial public device key stored in the initial public device key database 31 is created when the business DVD player is manufactured, and once created, it is not created again.
[0022]
The device key pair generator 32 generates x combinations of public device keys and secret device keys for x business DVD players. While the initial secret device key and the initial public device key stored in the initial public device key database 31 are not recreated, the public device key and secret device key can be recreated. This is to recreate the public device key and the secret device key when the secret device key is revealed by a malicious person.
[0023]
The public device key database 33 stores public device keys for the x business DVD players created by the device key pair generator 32. If the public device key is newly generated by the device key pair generator 32, the stored contents of the public device key database 33 are overwritten by the newly generated public device key. Therefore, the latest public device key generated by the device key pair generator 32 is stored in the public device key database 33.
[0024]
The content key encryption unit 34 encrypts the content key using x public device keys stored in the public device key database 33 to obtain x encrypted content keys.
The device key encryption unit 35 encrypts the secret device key generated by the device key pair generator 32 using the initial public device key unique to the x business DVD players 15, and the business DVD player 15. Write to the specific IC card 16.
[0025]
Next, the configuration of the business DVD player 15 will be described. The commercial DVD player 15 includes a descrambler 27, an MPEG decoder 28, and a system control unit 29, which can be said to be in common with the consumer DVD player 13. The point that the disk key decryption unit 25 to the content key decryption unit 26 are replaced with a device key decryption unit 41 and a content key decryption unit 42 is a difference from the consumer DVD player 13.
[0026]
The device key decryption unit 41 reads the encrypted secret device key encrypted from the IC card 16 and decrypts the encrypted secret device key using the initial secret device key unique to the device. Get a secret device key unique to.
The content key decrypting unit 42 reads the encrypted content key from the DVD, decrypts the encrypted content key using a secret device key unique to the own device, and obtains a content key.
[0027]
Although both CSS-DVD and EWCPS-DVD record movie content with the data structure shown in FIG. 2, only the VOB encryption method differs between CSS-DVD and EWCPS-DVD. Therefore, when the EWCPS-DVD is loaded in the consumer DVD player 13, the consumer DVD player 13 performs playback processing according to FP_PGCI6, menu navigation PGCI7, and PGCI recorded in the EWCPS-DVD, but decodes the VOB. The movie content will not be legitimately played. In other words, although the consumer DVD player 13 operates for the time being, it falls into a strange state in which nothing is played back.
[0028]
Next, the internal configuration of the recording apparatus 12 will be described with reference to FIG. As shown in FIG. 6, the recording apparatus 12 includes a user interface unit 50, an MPEG encoder 51, a scrambler 52, a reproduction order setting unit 53, a volume data creation unit 54, and a recording unit 55.
The user interface unit 50 receives an operation from the user via a mouse, a keyboard, a slide pad, or the like.
[0029]
The MPEG encoder 51 compresses and encodes video material, sub-video material, and audio material as movie material to obtain a video stream, audio stream, and sub-video stream, and obtains a VOB by interleaving and multiplexing these streams.
The scrambler 52 scrambles the VOB obtained by the MPEG encoder 51 using the content key supplied from the copyright holder 10 to obtain a scrambled VOB. The scrambler 52 performs different encryption processing in each of the cases where the recording destination DVD is CSS-DVD and the EWCPS-DVD. First, in case of CSS-DVD, VOB is encrypted by DES method. The encryption by the DES method is to divide the VOB into blocks of 8 bytes and to encrypt each block using a content key having a length of 56 bits 16 times.
[0030]
For EWCPS-DVD, VOB is encrypted using TripleDES. Triple-DES encryption means that the DES encryption described above is repeated three times to increase security.
The playback order setting unit 53 determines the playback order of the VOB corresponding to one scene of the movie content according to the user's operation received by the user interface unit 50, and generates VTSI 2 including PGC information indicating the playback order.
[0031]
The volume data creation unit 54 creates volume data. The volume data is data used as original data when creating a DVD master, and has a hierarchical structure including a plurality of directories. Various data are stored in each directory. In the present embodiment, the volume data creation unit 54 creates volume data including one or two directories, generates the VOB generated by the MPEG encoder 51 and encrypted by the scrambler 52, and the playback order setting unit 53. The recorded VTSI2 is made one video title set and written in this directory.
[0032]
In the generation of the directory and the writing of the video title set and the index 4 to the VIDEO_TS directory, the volume data creation unit 54 performs different processes for CSS-DVD and EWCPS-DVD. When the DVD is a CSS-DVD, the volume data creation unit 54 generates volume data including the VIDEO_TS directory, and writes the video title set including the VOB set 1 and VTSI 2 and the index 4 to the VIDEO_TS directory. Here, the VIDEO_TS directory is a directory that the consumer DVD player 13 is arranged to access, and when the CSS-DVD is loaded in the consumer DVD player 13, the consumer DVD player 13 exists here. FP_PGCI6 is executed first, and thereafter the titles included in this video title set are sequentially played back. FIG. 7 shows the contents stored in the VIDEO_TS directory of CSS-DVD. In this figure, it can be seen that the video title set (consisting of VOB set 1 and VTSI 2) and index 4 are written in the VIDEO_TS directory.
[0033]
Next, how the volume data creation unit 54 records the video title set and index 4 when the title is EWCPS-DVD will be described. In this case, the volume data creation unit 54 generates volume data including a VIDEO_TS directory and an EWCPS_TS directory, and records a video title set (consisting of VOB set 1 and VTSI 2) and an index 4 in the EWCPS_TS directory. The EWCPS_TS directory is a directory that the business DVD player 15 is arranged to access. When the EWCPS-DVD is loaded in the business DVD player 15, the business DVD player 15 exists in the EWCPS_TS directory. FP_PGCI6 to be executed first, and subsequently the titles included in the video title set are sequentially reproduced. On the other hand, no video title set is written in the VIDEO_TS directory. FIG. 8 is a diagram showing the contents stored in the VIDEO_TS directory and the EWCPS_TS directory when movie content is recorded on the EWCPS-DVD and released. As shown in the figure, a title set (consisting of VOB set 1 and VTSI 2) and an index 4 are written in the EWCPS_TS directory, and an index 60 is written in the VIDEO_TS directory. Since the video title set as movie content is written in the EWCPS_TS directory, even if a malicious person steals the EWCPS-DVD from inside the aircraft and loads it into the consumer DVD player 13, the movie content can be played back. I can't. In addition to the movie content being written in the EWCPS_TS directory, VOB set 1 is encrypted using a different encryption method than CSS-DVD, so even if you use a device that can access the EWCPS_TS directory, such as a personal computer, Movie content is never played.
[0034]
Next, the structure of the index 60 in the VIDEO_TS directory of EWCPS-DVD will be described. The EWCPS-DVD index 60 includes FP_PGCI 61, message navigation PGCI 62, and message VOB 63. The FP_PGCI 61 includes a Jmp command specifying the message navigation PGCI 62 as a jump destination. The message navigation PGCI 62 includes pointer information about the message VOB 63, and is PGC information for displaying the message VOB 63. The message VOB 63 is message data indicating that playback of the video title set recorded on the EWCPS-DVD by the consumer DVD player 13 is impossible as indicated by a broken line h3.
[0035]
Since the pointer information of the message navigation PGCI 62 points to this message VOB 63, and the FP_PGCI 61 designates the message navigation PGCI 62 as the jump destination, when the DVD is loaded into the consumer DVD player 13, it is automatically described above. Message VOB 63 will be displayed. If the EWCPS-DVD is accidentally loaded into the consumer DVD player 13, this message VOB 63 is automatically displayed, so that the user can know the reason why the title is not reproduced. For this reason, even if the EWCPS-DVD is accidentally loaded into the consumer DVD player 13, the user does not doubt that the DVD and the consumer DVD player 13 are out of order. Note that in the message VOB 63 in this figure, the character strings described above are described in a single language, but a plurality of character strings described in different languages are included in the message VOB 63 so that they can be multilingualized. Good. Each character string indicates that the movie content cannot be played back by the consumer DVD player 13, and the multilingual correspondence allows the intention of the message VOB 63 to be transmitted to many users. it can. The consumer DVD player 13 may display these multi-language character strings on the menu at a time, and the consumer DVD player 13 only displays those that match the language setting parameters set for itself. It may be displayed.
[0036]
In the VIDEO_TS directory and the EWCPS_TS directory shown in FIGS. 7 and 8, the video title set and the index are recorded in the VIDEO_TS directory with a file structure according to the DVD-Video standard. Hereinafter, how the VIDEO_TS directory is recorded with the file structure in accordance with the DVD-Video standard will be described. FIG. 9 is a diagram showing a file structure in the VIDEO_TS directory.
[0037]
In the DVD-Video standard, VOBs are recorded and handled in files named VTS_xx_x.VOB. Here, xx is the number of the video title set, and x (1, 2, 3, 4, 5... In the figure) is the VOB number.
In the DVD-Video standard, VTSI2 is recorded and handled in a file named VTS_xx_x.ifo. Here, xx is a video title set number, and x is a VTSI number. The PGCI table 3 included in the video title set is called VTS_PGCIT. The PGC information included in this is called TT_PGCI, and the title number in VTS indicating which title each PGC information corresponds to in the title set (VTS_TT # 1, # 2, # 3, # 4, # 5) ...).
[0038]
Menu VOB5 is recorded in a file named “VIDEO_TS.vob” in the DVD-Video standard. The menu displayed by the menu VOB5 is also called Video ManaGer Menu (VMGM).
FP_PGCI6 and menu navigation PGCI7 are recorded in a file named VIDEO_TS.ifo and recorded on a DVD. This VIDEO_TS.ifo includes Title_Search_Pointer (TT_SRPT) in addition to FP_PGCI6 and menu navigation PGCI7. In the Jmp command, the jump destination is specified using a number called TiTle_Number (TTN). On the other hand, TT_SRPT is a table that associates the VTS number (VTS # x) and the title number in VTS (VTS_TT # 1,2,3,4 ...) with the TTN specified as the jump destination in the Jmp command. is there. By referring to this TT_SRPT, it is possible to grasp which title is included in which video title set the title specified as the jump destination in the Jmp command.
[0039]
Also, the disc index 60 in the VIDEO_TS directory shown in FIG. 8 is recorded in a file structure in accordance with the DVD-Video standard. Hereinafter, how the index 60 is recorded in the VIDEO_TS directory with the file structure according to the DVD will be described. FIG. 10 is a diagram showing a file structure in the VIDEO_TS directory of EWCPS-DVD. The message VOB 63 is recorded in a file named “VIDEO_TS.vob” in the DVD-Video standard.
[0040]
FP_PGCI 61 and message navigation PGCI 62 are recorded and recorded in a file named VIDEO_TS.ifo. Here, FP_PGCI 61 includes a Jmp command in which VMGM_PGCI is specified as a jump destination, and message navigation PGCI 62 has pointer information about VIDEO_TS.vob, so that message VOB 63 is displayed by following the Jmp command and pointer information. Will be. This is the end of the description of the volume data creation unit 54. Next, the recording unit 55 will be described.
[0041]
When the volume data is generated by the volume data creation unit 54, the recording unit 55 converts the volume data together with the content key acquired from the CSS key management center 11 and the EWCPS key management center 14 and the disk key acquired from the CSS key management center into CSS. -Record on DVD or EWCPS-DVD and create DVD master. DVD manufacturers use this master to mass-produce DVDs.
[0042]
FIG. 11 is a flowchart showing a processing procedure of the recording apparatus 12 configured as described above. Hereinafter, the processing procedure of the recording apparatus 12 will be described with reference to this flowchart.
In step S1, the MPEG encoder 51 obtains a plurality of VOBs by encoding video material, audio material, and sub-video material.
[0043]
In step S2, the playback order setting unit 53 creates the playback order of each VOB in accordance with the user operation and creates VTSI2 including a plurality of PGCIs indicating the playback order. In step S3, the volume data creation unit 54 lists the title names. A menu VOB5 to be displayed is created. In step S4, the volume data creation unit 54 creates a menu navigation PGCI7 including pointer information about the menu VOB5 and a Jmp command specifying each title as a jump destination. In step S5, the volume data creation unit 54 creates the menu navigation PGCI7. FP_PGCI6 including the Jmp command designated as the jump destination is created, and in step S6, the volume data creation unit 54 creates the index 4 including the menu VOB5, FP_PGCI6, and menu navigation PGCI7.
[0044]
In step S7, the user interface unit 50 receives designation of whether the DVD is for business use or consumer use. If it is designated for consumer use, the volume data creation unit 54 creates the VIDEO_TS directory in step S8, and the scrambler 52 scrambles the VOB using the content key and writes it in the VIDEO_TS directory in step S9 based on the DES method. . In step S10, VTSI2 and index 4 are written into the VIDEO_TS directory. With the above processing, the contents of the VIDEO_TS directory are as shown in FIG.
[0045]
On the other hand, if it is designated for business use, the volume data creation unit 54 creates the VIDEO_TS directory and the EWCPS_TS directory in step S11, and the scrambler 52 scrambles the VOB using the content key based on Triple-DES in step S12. And write to the EWCPS_TS directory. In step S13, the volume data creation unit 54 writes VTSI2 and index 4 to the EWCPS_TS directory. In step S14, the volume data creation unit 54 creates a message VOB 63 indicating that this title cannot be reproduced by the consumer DVD player 13. In step S15, the volume data creation unit 54 creates pointer information about the message VOB 63. Is generated, and FP_PGCI 61 including a Jmp command in which the message navigation PGCI 62 is specified as a jump destination is generated.
[0046]
In step S16, the volume data creation unit 54 creates an index 60 including FP_PGCI 61, message navigation PGCI 62, and message VOB 63. In step S17, the volume data creation unit 54 writes the index 60 in the VIDEO_TS directory. With the above processing, the contents of the EWCPS_TS directory and the VIDEO_TS directory in the EWCPS-DVD are as shown in FIG.
[0047]
How the CSS-DVD and EWCPS-DVD recorded by the recording device 12 are used will be described with reference to FIGS. 12 to 15 are views showing the inside of an aircraft in which the consumer DVD player 13 and the commercial DVD player 15 are installed. In this figure, it is assumed that a plurality of CSS-DVDs and EWCPS-DVDs recorded by the recording device 12 are stored in the in-machine library 71. A commercial DVD player 15 is connected to the projector 73 in the in-flight screening room 72, and a consumer DVD player 13 is provided in the passenger seat 75 in the guest room 74. The EWCPS-DVD and CSS-DVD stored in this library 71 are loaded into the commercial DVD player 15 in the presentation room 72 and the consumer DVD player 13 in the guest room as indicated by arrows jy1 and jy2, respectively. To do. In this case, the titles recorded on these EWCPS-DVD and CSS-DVD are normally reproduced as shown in FIG.
[0048]
On the other hand, it is assumed that the EWCPS-DVD stored in the library 71 is brought into the cabin 74 as shown in FIG. 14 by mistake and loaded into the consumer DVD player 13 provided for the passenger seat. In this case, the consumer DVD player 13 sequentially executes the FP_PGCI 61 and the message navigation PGCI 62 existing in the VIDEO_TS directory without playing back the titles existing in the EWCPS_TS directory, and cannot be played back by the consumer DVD player 13. The message VOB 63 indicating is reproduced. FIG. 15 is a diagram showing the consumer DVD player 13 in a state where the message VOB 63 is reproduced. As shown in this figure, even when the EWCPS-DVD is erroneously loaded into the consumer DVD player 13, the consumer DVD player 13 indicates that the title recorded on the EWCPS-DVD cannot be reproduced. Therefore, the user who sees this can understand his mistake. In this example of operation, the DVD player installed in the screening room is the commercial DVD player 15, but the DVD player installed in the first class and business class even if the DVD player is installed in the guest room. May be a business DVD player 15. In the present embodiment, the title set stored in the VIDEO_TS directory of CSS-DVD may be different from the title set stored in the EWCPS_TS directory of EWCPS-DVD.
[0049]
(Second Embodiment)
In the first embodiment, the EWCPS_TS directory and the VIDEO_TS directory are generated for storing the video title set when the title is recorded on the EWCPS-DVD. In the second embodiment, the title is recorded on the EWCPS-DVD. In this example, only the VIDEO_TS directory is generated without storing the EWCPS_TS directory, and the title is recorded here.
[0050]
FIG. 16 is a diagram showing a configuration of a VIDEO_TS directory according to the second embodiment. In this figure, the message VOB 63 indicates that playback by the consumer DVD player 13 is impossible. The message navigation PGCI 62 is PGC information including pointer information regarding the message VOB 63. The FP_PGCI 61 according to the second embodiment includes a first entry area and a second entry area. The first entry area is an area that is first accessed by the apparatus when the disc is loaded into the consumer DVD player 13, and the second entry area is when the disc is loaded into the commercial DVD player 15. This is the area that is first accessed by the device. When a DVD is used for consumer use, a Jmp command having a title in the video title set as a jump destination is written in the first entry area, and no jump command is written in the second entry area. On the other hand, when a DVD is used for an aircraft, a Jmp command having the message navigation PGCI 62 as a jump destination is displayed in the first entry area, and a Jmp command having the title in the video title set as a jump destination is displayed in the second entry area Write.
[0051]
When an EWCPS-DVD having such a data structure is loaded in the consumer DVD player 13, the consumer DVD player 13 accesses the index 60 as follows. That is, when the consumer DVD player 13 is loaded with the EWCPS-DVD, the first of the two Jmp commands written in the two entry areas included in the FP_PGCI 61 of the VIDEO_TS directory is written in the first entry area. Run things. This first Jmp command designates the message navigation PGCI 62 as the jump destination, and the message navigation PGCI 62 has pointer information about the message VOB 63, so that the message VOB 63 is displayed as a result. Become.
[0052]
On the other hand, the business DVD player 15 according to the second embodiment ignores the first of the two Jmp commands written in the two entry areas included in the FP_PGCI 61 and written in the first entry area. Execute the second one written in the second entry area. Since the second Jmp command specifies the title in the video title set as the jump destination, each title is played back by executing the second of the two Jmp commands included in FP_PGCI61. It will be.
[0053]
In the second embodiment, it is desirable to prohibit the user's operation from being accepted by the UOP information included in the FP_PGCI 61 or the message navigation PGCI 62. This is because it is not desirable for the consumer DVD player 13 to perform any reproduction processing according to the user operations when user operations are performed during the execution of the FP_PGCI 61 and the message navigation PGCI 62.
[0054]
The video title set of EWCPS-DVD shown in FIG. 16 is recorded in the VIDEO_TS directory with a file structure in accordance with the DVD-Video standard. Hereinafter, how the VIDEO_TS directory is recorded with the file structure in accordance with the DVD-Video standard will be described. FIG. 17 is a diagram showing a file structure in the VIDEO_TS directory according to the second embodiment. The FP_PGCI 61 includes a Jmp command “Jmp VMGM_PGC” and a Jmp command “Jmp TTN # 1”, and the message navigation PGCI 62 has pointer information about Video_TS.VOB. The first Jmp command “Jmp VMGM_PGC” specifies VMGM_PGC, and the second Jmp command “Jmp TTN # 1” specifies TTN # 1. By executing the first Jmp command “Jmp VMGM_PGC”, the VOB is displayed, the professional DVD player 15 ignores the first Jmp command “Jmp VMGM_PGC”, and the second Jmp command “Jmp TTN # By executing “1”, the title is reproduced.
[0055]
Although it has been described based on the above embodiment, it is merely presented as an example of a system that can be expected to have the best effect in the present situation. The present invention can be modified and implemented without departing from the gist thereof. As typical modified embodiments, there are the following (A), (B), (C),...
(A) In the first and second embodiments, the business DVD player 15 reproduces only the EWCPS-DVD. However, when the user performs a predetermined operation on the business DVD player 15, the business DVD player 15 15 may play CSS-DVD.
(B) The message VOB in the first embodiment may be as follows.
[0056]
“Reproduction of this movie title in the audience seats is impossible. Please see in the screening room. ]
(C) In the second embodiment, the commercial DVD player 15 is configured to ignore the first command read when playing a DVD. However, the command need not be the first, and the commands read in an arbitrary order. It is also possible to take a configuration that ignores.
[0057]
(D) The VOB recorded on the aviation DVD is encrypted based on the EWCPS method, but the same effect can be obtained when encrypted using the CSS method. Further, it is not necessary to perform encryption.
(E) In the second embodiment, the first command included in the FP_PGCI 61 designates the message VOB as the jump destination, but the message VOB is reproduced indirectly through an arbitrary number of commands. Also good.
[0058]
(F) Although the name of the directory referred to first in the first is the EWCPS_TS directory, other names may be used.
(G) In the first and second embodiments, the message VOB is reproduced when the consumer DVD player 13 reproduces the EWCPS-DVD format. However, a title trailer, a digest video, and the like may be reproduced together.
[0059]
(H) In the first and second embodiments, a DVD is used as a recording medium. However, it is not always necessary to use a DVD as a recording medium, and VOB playback can be controlled by management information attached to the VOB. Any recording medium may be used as long as such a configuration is adopted.
(I) The procedure described with reference to the flowchart in the present embodiment (the flowchart in FIG. 11) and the like may be realized by a machine language program and recorded on a recording medium to be distributed and sold. Such a recording medium includes an IC card, an optical disk, a floppy disk, and the like, and the machine language program recorded on these is used by being installed in a general-purpose computer. The general-purpose computer sequentially executes the installed machine language program to realize the function of the recording apparatus shown in the present embodiment.
[0060]
(J) In the first and second embodiments, the movie content has been described as an example. However, any content may be used as long as the content is digitized. Further, although the business content is used in an aircraft, it may be used in a ship, a train, or an automobile.
[0061]
【The invention's effect】
According to the present invention,ThisEven if the user mistakenly loads the optical disc on which the digital content has been written by the recording device into the consumer playback device, the user does not doubt that the playback device is broken. When the consumer playback device is used as an aircraft facility, passengers who are users do not suspect the consumer playback device, so that the in-flight operations of the aircraft are performed smoothly.
[Brief description of the drawings]
FIG. 1 is a diagram showing a movie content distribution schedule by a movie company.
FIG. 2 is a diagram showing how a video title set is stored in a DVD.
FIG. 3 is a diagram showing how a title is reproduced by a Jmp command included in FirstPlayPGCI6 and menu navigation PGCI7.
FIG. 4 is a diagram showing a process in which VOB is encrypted and decrypted in CSS-DVD.
FIG. 5 is a diagram illustrating a process in which VOB is encrypted and decrypted in EWCPS-DVD.
6 is a diagram showing an internal configuration of the recording apparatus 12. FIG.
FIG. 7 is a diagram showing contents stored in a VIDEO_TS directory of CSS-DVD.
FIG. 8 is a diagram illustrating contents stored in a VIDEO_TS directory and an EWCPS_TS directory when movie content is recorded on an EWCPS-DVD and released.
FIG. 9 is a diagram showing a file structure in a VIDEO_TS directory.
FIG. 10 is a diagram showing a file structure in a VIDEO_TS directory of EWCPS-DVD.
FIG. 11 is a flowchart illustrating a processing procedure of the recording apparatus.
FIG. 12 is a view showing the inside of an aircraft in which a consumer DVD player 13 and a commercial DVD player 15 are installed.
FIG. 13 is a view showing the inside of an aircraft in which a consumer DVD player 13 and a commercial DVD player 15 are installed.
FIG. 14 is a diagram showing the inside of an aircraft in which a consumer DVD player 13 and a commercial DVD player 15 are installed.
FIG. 15 is a diagram showing the inside of an aircraft in which a consumer DVD player 13 and a commercial DVD player 15 are installed.
FIG. 16 is a diagram showing a configuration of a VIDEO_TS directory according to the second embodiment.
FIG. 17 is a diagram showing a file structure in a VIDEO_TS directory according to the second embodiment.
[Explanation of symbols]
2 Video title set management information
3 PGC information table
4 Title set index
11 CSS Key Management Center
12 Recording device
13 Consumer DVD player
14 IFE Key Management Center
15 Professional DVD player
16 IC card
21 Content key encryption unit
22 Disk key encryption unit
25 Disk key decryption unit
26 Content Key Decryption Unit
27 Descrambler
28 MPEG decoder
29 System controller
31 Initial public device key database
32 Device Key Pair Generator
33 Public Device Key Database
34 Content Key Encryption Unit
35 Device key encryption section
41 Device key decryption unit
42 Content key decryption unit
50 User interface section
51 MPEG encoder
52 Scrambler
53 Playback order setting section
54 Volume Data Creation Department
55 Recording section
60 Title Set Index

Claims (4)

A recording device for recording digital content on an optical disc,
Encoding means for encoding content material and obtaining a plurality of video objects;
An encryption means for encrypting the video object in accordance with either a content protection system for normal publication or a content protection system for early publication;
Creating means for creating a video title set including a plurality of encrypted video objects and information indicating the playback order of the encrypted video objects;
When the content is normally released, only the first directory is generated on the optical disc, and when the content is released early, the first directory and the second directory are generated on the optical disc, and the video title set is recorded in the generated directory. Recording means,
The first directory is a directory having a directory name that is recognized as a storage location of a video title set by a consumer playback device, and includes a video title set and an index thereof.
The second directory is a directory having a directory name that cannot be recognized as a storage location of the video title set by the consumer playback device but can be recognized as a storage location of the video title set for early publication by the commercial playback device. Yes, it consists of a video title set and its index,
The recording means includes
When recording content for early publication, the second directory includes a video title set including a video object protected by a protection method for early publication and an index including menu data associated with the video title set. As well as recording
An index including a message that the consumer playback device cannot playback the video title set is recorded in the first directory;
When recording content for normal release, the first directory includes a video title set including a video object protected by a normal release protection method and an index including menu data associated with the video title set. To record
A recording apparatus . Each of the business playback devices has a unique device key,
The encryption means further includes:
A video object encryption means for encrypting using the content key to the video object,
Content key encryption means for encrypting the content key using the device key,
The Symbol recording means further recording apparatus according to claim 1, the content key encrypted by said content key encryption means and be recorded in the second directory. A recording method for executing control of a recording apparatus for recording digital content on an optical disc on a computer ,
Encoding the content material to obtain a plurality of video objects;
An encryption step for encrypting the video object in accordance with either a content protection scheme for normal publication or a content protection scheme for early publication;
Creating a video title set including a plurality of encrypted video objects and information indicating the playback order of the encrypted video objects;
When the content is normally released, only the first directory is generated on the optical disc, and when the content is released early, the first directory and the second directory are generated on the optical disc, and the video title set is recorded in the generated directory. Recording step,
The first directory is a directory having a directory name that is recognized as a storage location of a video title set by a consumer playback device, and includes a video title set and an index thereof.
The second directory is a directory having a directory name that cannot be recognized as a storage location of the video title set by the consumer playback device but can be recognized as a storage location of the video title set for early publication by the commercial playback device. Yes, it consists of a video title set and its index,
The recording step includes
When recording content for early publication, record a video title set including a video object protected by a protection scheme for early publication in the second directory;
An index including a message that the consumer playback device cannot playback the video title set is recorded in the first directory in association with the video title set;
A recording method comprising recording a video title set including a video object protected by a protection method for normal release in a first directory when content is recorded for normal release . A recording program for causing a computer to control a recording device for recording digital content on an optical disc,
Encoding the content material to obtain a plurality of video objects;
An encryption step for encrypting the video object in accordance with either a content protection scheme for normal publication or a content protection scheme for early publication;
Creating a video title set including a plurality of encrypted video objects and information indicating the playback order of the encrypted video objects;
When the content is normally released, only the first directory is generated on the optical disc, and when the content is released early, the first directory and the second directory are generated on the optical disc, and the video title set is recorded in the generated directory. Let the computer execute the recording step,
The first directory is a directory having a directory name that is recognized as a storage location of a video title set by a consumer playback device, and includes a video title set and an index thereof.
The second directory is a directory having a directory name that cannot be recognized as a storage location of the video title set by the consumer playback device but can be recognized as a storage location of the video title set for early publication by the commercial playback device. Yes, it consists of a video title set and its index,
The recording step includes
When recording content for early publication, record a video title set including a video object protected by a protection scheme for early publication in the second directory;
An index including a message that the consumer playback device cannot playback the video title set is recorded in the first directory in association with the video title set;
A recording program for recording a video title set including a video object protected by a protection method for normal release in a first directory when content is recorded for normal release .

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