JP2006079763A - Processing method, optical disk device, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable only a permitted user to access contents recorded on an optical disk. <P>SOLUTION: When an area change command including a readout start address is received from a host device for an optical disk manufactured so that contents recorded in a read-only area are apparently absent, the attribute of a TLO recorded on the optical disk is changed to be invalid (step 405) if a regular user has issued the area change command (step 401), a new TLO is recorded in the area following the read-only area (step 411), and an LWA recorded in a lead-in area is rewritten into the address right before the new TLO (step 413). Consequently, the read-only area becomes an accessible area and only the permitted user can access the contents recorded in the read-only area. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a processing method, an optical disc apparatus, a program, and a recording medium. More specifically, the present invention relates to a processing method for protecting content recorded on an optical disc, and an optical disc in which an accessible area in a data area is limited. The present invention relates to an optical disc apparatus that can handle the above, a program used for the optical disc apparatus, and a recording medium on which the program is recorded.

  In recent years, with the advancement of digital technology and the improvement of data compression technology, as an information recording medium for recording information (hereinafter also referred to as “content”) such as programs (programs for computers), music, movies and photographs, CDs are used. Optical discs such as (compact discs) and DVDs (digital versatile discs) have attracted attention, and along with the reduction in price, optical disc devices have become popular as devices for accessing optical discs. A device for accessing an information recording medium is also collectively referred to as a “drive device”.

  According to CD-R (CD-recordable) and CD-RW (CD-rewritable) standards, the so-called Orange Book, there are a read-only area and a recordable area in one disc. It is allowed to mix. Such an optical disc is also called a hybrid disc. It has been proposed to distribute or sell content in a state where the content is recorded in a read-only area of the hybrid disc (see, for example, Patent Documents 1 to 3).

  In addition, even in a DVD having a larger recording capacity than a CD, hybridization in which a read-only area and a recordable area are mixed is being studied (for example, see Patent Document 4). For example, in the case of DVD + RW (DVD + rewritable), the recordable area is a rewritable area. By the way, according to the DVD + RW standard, if the recorded area and the unrecorded area are mixed in the data area, compatibility with the DVD-ROM is impaired. In such a case, as an example, FIG. As shown in FIG. 4, a temporary lead out (hereinafter also referred to as “TLO”) is added to the end of the recorded area. As a result, even if there is an unrecorded area in the data area, the recorded area of DVD + RW can be reproduced by a DVD-ROM drive device. That is, the area from the beginning of the data area to the TLO is an accessible area.

  In the DVD + R, various devices have been devised for ensuring compatibility with the DVD-ROM (see, for example, Patent Document 5).

  Since a DVD hybrid disc can record more content and larger content than a CD, it is expected that high-value (higher price) content will be recorded than a CD hybrid disc. In the future, when commercializing a hybrid DVD disc, it is essential to protect the content from unauthorized access.

JP 7-319709 A JP 2000-148504 A JP 2001-273182 A Japanese Patent Laid-Open No. 2003-249022 JP 2003-323767 A

  The present invention has been made under such circumstances, and a first object of the present invention is to provide a processing method that enables only authorized users to access content recorded on an optical disc.

  A second object of the present invention is to provide an optical disc apparatus that allows only authorized users to access content recorded on the optical disc.

  A third object of the present invention is a program that is executed by a computer for controlling an optical disk device and that allows only authorized users to access content recorded on the optical disk, and the program recorded therein. It is to provide a recording medium.

  The invention according to claim 1 is a processing method for protecting content recorded in a data area of an optical disc, wherein an end position of an already recorded area in the data area is temporarily placed in front of the content. It is a processing method including a step of setting and pretending that the content does not exist for the drive device.

  According to this, the end position of the recorded area in the data area is temporarily set in front of the content recorded in the data area of the optical disc, and it appears to the drive device that no content exists. Therefore, it can be assumed that no content is recorded on the optical disc for a user who is not permitted to access the content. Therefore, as a result, only authorized users can access the content recorded on the optical disc.

  In this case, as in the processing method according to claim 2, the end position is changed to a position behind the content in response to the end position change request, and the existence of the content is clarified to the drive device. The process of making can be further included.

  In this case, it is possible to further include a step of creating file management information of files recorded up to the new end position after the change, as in the processing method according to claim 3.

  In this case, it is possible to further include a step of recording the file management information created in the creating step in the data area, as in the processing method according to claim 4.

  5. Each processing method according to claim 1, wherein, as in the processing method according to claim 5, the optical disc has a read-only area and a recordable area, and the area in which the content is recorded. Can be said read-only area.

  In this case, the recordable area can be an area where the recorded contents can be rewritten, as in the processing method according to claim 6.

  The invention according to claim 7 is an optical disc capable of handling an optical disc in which an accessible area in the data area is limited and an area in which the content in the data area is recorded is not included in the accessible area. A control device that changes the accessible area so that the area in which the content is recorded can be accessed in response to a change request; and a process for performing the content reproduction process And an optical disc device comprising:

  According to this, in response to the change request, the accessible area is changed so that the area where the content is recorded can be accessed. Therefore, by allowing only the user who is permitted to access the content to issue the change request, only the authorized user can access the content recorded on the optical disc as a result.

  In this case, as in the optical disk device according to claim 8, the control device further creates file management information of a file recorded in the new accessible area after the change, and the data area Can be recorded.

  In each of the optical disk devices according to the seventh and eighth aspects, as in the optical disk device according to the ninth aspect, the control device further records a lead-out in a new accessible area after the change. The lead-out can be invalidated during

  In this case, as in the optical disc device according to the tenth aspect, the control device can invalidate the lead-out by changing the attribute of the lead-out to data.

  In each of the optical disk devices according to claims 7 to 10, as in the optical disk device according to claim 11, the change request is a change request in which an address after the area where the content is recorded is added as a designated address. The control device can change the accessible area according to the designated address.

  In this case, as in the optical disk device according to claim 12, the designated address is a start address of an area in which a lead-out is recorded, and the control device designates an end address of the accessible area. It can be changed to the address immediately before the address.

  In each of the optical disk devices according to claims 7 to 12, as in the optical disk device according to claim 13, the control device further defines an area that can be accessed after the change when the optical disk is ejected. It is possible to return to the area where access is possible before the change.

  According to the fourteenth aspect of the present invention, an accessible area in the data area is limited, and an optical disk capable of handling an optical disk in which the area in which the content is recorded in the data area is not included in the accessible area A program for use in an apparatus that causes a computer for controlling the optical disc apparatus to execute a procedure for changing the accessible area so that the area in which the content is recorded can be accessed It is.

  According to this, when the program of the present invention is loaded into a predetermined memory and its head address is set in the program counter, the control computer of the optical disc apparatus can access the area where the content is recorded. The accessible area is changed so that Therefore, only the user who is permitted to access the content can change the accessible area, and as a result, only the permitted user can access the content recorded on the optical disc. Become.

  In this case, as in the program according to claim 15, the control computer is further caused to execute a procedure for creating file management information of a file recorded in the newly accessible area after the change. Can be.

  In this case, as in the program according to claim 16, the control computer can be caused to further execute a procedure for recording the file management information created in the creating procedure in the data area.

  In each of the programs according to claims 14 to 16, when the lead-out is recorded in a new accessible area after the change as in the program according to claim 17, the lead-out is recorded. The procedure for invalidation can be further executed by the control computer.

  In this case, as in the program according to claim 18, the procedure for changing the attribute of the readout to data can be executed by the control computer as the invalidation procedure.

  19. In each program according to claim 14, the area that can be accessed after the change when the optical disc is ejected is the area that can be accessed before the change, as in the program according to claim 19. The procedure for returning to (2) can be further executed by the control computer.

  In each program according to claims 14 to 19, as in the program according to claim 20, as the changing procedure, a procedure for changing the accessible area on the basis of a change request received in advance. And can be executed by the control computer.

  In this case, as in the program according to claim 21, the change request is a change request to which an address after the area in which the content is recorded is added as a specified address. It is possible to cause the control computer to execute a procedure for changing the accessible area according to an address.

  In this case, as in the program according to claim 22, the designated address is a start address of an area in which a lead-out is recorded, and an end address of the accessible area is designated as the changing procedure. It is possible to cause the control computer to execute a procedure for changing to an address immediately before the address.

  The invention described in claim 23 is a computer-readable recording medium on which the program according to any one of claims 14 to 22 is recorded.

  According to this, since the program according to any one of claims 14 to 22 is recorded, by causing the computer to execute the program, only the authorized user as a result is recorded in the content recorded on the optical disc. It becomes possible to access.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of an optical disc apparatus 20 according to an embodiment of the present invention.

  An optical disk device 20 shown in FIG. 1 includes a spindle motor 22 for rotating the optical disk 15, an optical pickup device 23, a seek motor 21 for driving the optical pickup device 23 in the sledge direction, a laser control circuit 24, An encoder 25, a drive control circuit 26, a reproduction signal processing circuit 28, a buffer RAM 34, a buffer manager 37, an interface 38, a flash memory 39, a CPU 40, a RAM 41, and the like are provided. Note that the arrows in FIG. 1 indicate the flow of typical signals and information, and do not represent the entire connection relationship of each block. The optical disk device 20 corresponds to a DVD optical disk.

  The optical pickup device 23 is a device for condensing laser light on the recording surface of the optical disc 15 and receiving reflected light from the recording surface. The optical pickup device 23 includes a semiconductor laser that emits a laser beam having a wavelength of about 660 nm, an objective lens, guides the light beam emitted from the semiconductor laser to the recording surface of the optical disk 15, and returns the light reflected by the recording surface. It includes an optical system that guides the light beam to a predetermined light receiving position, a light receiver that is arranged at the light receiving position and receives the return light beam, a drive system (focusing actuator and tracking actuator) (both not shown), and the like. . The light receiver has a plurality of light receiving elements (or light receiving areas), and a signal corresponding to the amount of light received by each light receiving element (or light receiving area) is output to the reproduction signal processing circuit 28.

  The reproduction signal processing circuit 28 acquires a servo signal (such as a focus error signal and a track error signal), address information, a synchronization signal, and an RF signal based on the output signal of the light receiver. The servo signal obtained here is output to the drive control circuit 26, the address information is output to the CPU 40, and the synchronization signal is output to the encoder 25, the drive control circuit 26, and the like. Further, the reproduction signal processing circuit 28 performs decoding processing, error detection processing, and the like on the RF signal. When an error is detected, the reproduction signal processing circuit 28 performs error correction processing, and then plays back the buffer via the buffer manager 37 as reproduction data. Store in the RAM 34.

  The drive control circuit 26 generates a drive signal for the tracking actuator for correcting the displacement of the objective lens in the tracking direction based on the track error signal from the reproduction signal processing circuit 28. Further, the drive control circuit 26 generates a driving signal for the focusing actuator for correcting the focus shift of the objective lens based on the focus error signal from the reproduction signal processing circuit 28. Each drive signal generated here is output to the optical pickup device 23. Thereby, tracking control and focus control are performed. Furthermore, the drive control circuit 26 generates a drive signal for driving the seek motor 21 and a drive signal for driving the spindle motor 22 based on an instruction from the CPU 40. Each drive signal is output to the seek motor 21 and the spindle motor 22, respectively.

  The buffer RAM 34 temporarily stores data to be recorded on the optical disc 15 (recording data), data reproduced from the optical disc 15 (reproduction data), and the like. Data input / output to / from the buffer RAM 34 is managed by the buffer manager 37.

  The encoder 25 takes out the recording data stored in the buffer RAM 34 through the buffer manager 37 based on an instruction from the CPU 40, modulates the data, adds an error correction code, and the like, and writes a signal to the optical disc 15. Is generated. The write signal generated here is output to the laser control circuit 24.

  The laser control circuit 24 controls the light emission power of a semiconductor laser constituting the optical pickup device 23. For example, during recording, a laser control circuit 24 generates a drive signal for the semiconductor laser based on the write signal, the recording conditions, the light emission characteristics of the semiconductor laser, and the like.

  The interface 38 is a bidirectional communication interface with a host device 90 (for example, a personal computer), and is a standard interface such as ATAPI (AT Attachment Packet Interface), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). It is compliant.

  The flash memory 39 stores various programs including a program according to the present invention described by codes decodable by the CPU 40, recording conditions including recording power and recording strategy information, and emission characteristics of the semiconductor laser. Yes.

  The CPU 40 controls the operation of each unit in accordance with the program stored in the flash memory 39 and stores data necessary for control in the RAM 41 and the buffer RAM 34.

  Here, a universal disc format (hereinafter referred to as “UDF”) standard established by OSTA (Optical Storage Technology Association) as an optical disc file format will be described (for example, Optical Storage Technology Association, “Universal DiskFormat Specification, Revision 2.50, April 30, 2003 ”). This UDF is standardized with the main concept of (1) enabling data exchange between different operating systems (OS) and (2) allowing data to be handled in common on various optical disks. It is widely used as a general file format for DVDs.

  For example, as shown in FIG. 2, a case where folder 1 (Folder1) is located as a subdirectory under the root directory and file 1 (File1) is stored in the folder 1 will be described.

  A file identification descriptor (File ID) of the folder 1 exists in the root directory indicated by the file entry (File Entry) of the root directory. The file identification descriptor of the folder 1 includes the position information of the file entry of the file 1. In the file entry of file 1, there is an allocation descriptor (Allocation Descriptor) in which position information and length information of the file 1 body is described. Therefore, as shown in FIG. 3, it is possible to access the file 1 body by following the path of the root directory file entry → folder 1 file identification descriptor → file 1 file entry → allocation descriptor → file 1 body. it can. Note that the position of the file entry in the root directory can be specified from an AVDP (Anchor Volume Descriptor Pointer) recorded at a predetermined position.

  Next, the optical disk 15 will be described. As shown in FIG. 4 as an example, the optical disc 15 has three information zones (Lead-in Zone, Data Data) in the information zone from the inner circumference side to the outer circumference side of the disc. It is divided into an area (Data Zone) and a lead-out area (Lead-out Zone). This data area is composed of three areas (D1, D2, D3) from the inner circumference side toward the outer circumference side. Although the actual track of the optical disk 15 is spiral, for convenience, the track is shown as a straight line in FIG. 4, with the left side of the paper being the inner periphery of the disk and the right side of the paper being the outer periphery of the disk.

  The lead-in area D1 is a rewritable area A, D2 is a read-only area, and D3 and the lead-out area are rewritable areas B. Here, the rewritable area A and the rewritable area B each have the same physical properties as DVD + RW. Therefore, the optical disk 15 is a hybrid disk in which a part of the data area of DVD + RW is a read-only area.

  Like the DVD + RW, the lead-in area is composed of 12 zones as shown in FIG. 5 (see, for example, “ECMA-337”). That is, the initial zone, the inner disc test zone, the inner drive test zone, the guard zone 1 and the reserved zone Zone 1 (Reserved Zone 1), Reserved Zone 2 (Reserved Zone 2), Inner Disc Identification Zone (Inner Disc Identification Zone), Reserved Zone 3 (Reserved Zone 3), Reference Code Zone (Reference Code Zone), buffer zone 1 (Buffer Zone 1), control data zone (Control Data Zone), and buffer zone 2 (Buffer Zone 2).

  The inner disk identification zone is an area composed of 16 ECC blocks (256 sectors), and this area is a type of disk control block (hereinafter referred to as “DCB”). A disc control block (Formatting Disc Control Block, hereinafter referred to as “FDCB”) is recorded.

  This FDCB is 16-sector information as shown in FIG. 6. The first sector is a 4-byte content descriptor (Content Descriptor), a 4-byte unknown content descriptor actions (Unknown Content Descriptor Actions). (UCDA)), a 32-byte drive ID (Drive ID), and a 2008-byte content descriptor specific (Content Descriptor Specific). The subsequent 9 sectors are a formatting bitmap, and the recording state for each physical sector is recorded. The remaining six sectors are reserved areas (Reserved), and all “0” are recorded as dummy data.

  In the content descriptor, an ASCII code of “FDC” or the like is recorded as information indicating that the DCB is FDCB.

  In the UCDA, information related to processing to be prohibited when the optical disc apparatus does not support FDCB is recorded in the bitmap format as prohibition information. This prohibition information includes prohibition information relating to recording in the data area, prohibition information relating to notification of block data information to the user, prohibition information relating to the format, and prohibition information relating to the content change of the block data, etc. It corresponds to the bit.

  In the drive ID, information for specifying the optical disk device used for recording the FDCB is recorded.

  As shown in FIG. 7, the content descriptor specific includes the FDCB update count (FDCB update count; 4 bytes), the format status and mode (Formatting status and mode; 4 bytes), and the last recorded address. (Last written address; 4 bytes, hereinafter referred to as “LWA”), last verified address (Last verified address; 4 bytes), bitmap start address (Bitmap start address; 4 bytes), bitmap length (Bitmap Length 4 bytes), disc ID (Disc ID; 32 bytes), application dependent (32 bytes), and dummy data (Reserved; 1920 bytes).

  In the control data zone, the start address and end address of the data area are recorded.

  In this embodiment, as shown in FIG. 8 as an example, when the optical disc 15 is manufactured, data A and TLO (temporary lead-out) as a lead-out are recorded in D1, and two contents (contents 1 and 1) are recorded in D2. Assume that content 2) is recorded. It is assumed that the end address (= address immediately before TLO) of the area where data A is recorded is recorded as the LWA of the FDCB. In this case, the area from the start address of the data area to the LWA is an accessible area (hereinafter abbreviated as “accessible area”). That is, in the present embodiment, the position indicated by LWA is the end position of the recorded area in the data area. Therefore, the data A is included in the accessible area, but the contents 1 and 2 are not included in the accessible area.

  As an example, as shown in FIG. 9, it is assumed that a file of data A (referred to as “file A”) is stored in the root directory. In this case, as shown in FIG. 10, data is traced along the route of root directory file entry → file A file identification descriptor → file A file entry → allocation descriptor → file A body (data A). A can be accessed. File management information corresponding to this file structure is recorded in an area defined by the UDF standard. Data A is initial data of content 1 and content 2, and is used when content 1 and content 2 are loaded (reproduced).

  In this way, it appears that the content does not exist for the drive device. In this state, the optical disk 15 is distributed to the user. In this state, the data A can be accessed through the drive device, but the contents 1 and 2 cannot be accessed.

  Next, the processing of the optical disc device 20 (hereinafter, referred to as “region change command” for the sake of convenience) for receiving a command (change request; hereinafter, abbreviated as “region change command” for convenience) from the host device 90. "Access processing") will be described with reference to FIG. At present, there is no area change command (not standardized) in the DVD + RW command set, so a new area change command is defined. Here, as an example, as shown in FIG. 12A, DDh that is not currently used as an operation code is used as an operation code, and a lead-out is recorded in bytes 5 to 8. A command composed of 12 bytes in which the leading address (Lead Out Start Address) is set as an area change command. That is, the start address (designated address) of the area where the lead-out is recorded is added to the area change command. Note that bytes 1 to 4 and bytes 9 to 11 are reserved areas.

  The flowchart in FIG. 11 corresponds to a series of processing algorithms executed by the CPU 40. When the area change command is received from the host device 90, the head address of the program (hereinafter referred to as “access processing program”) corresponding to the flowchart of FIG. 11 stored in the flash memory 39 is set in the program counter of the CPU 40, and the access processing Starts.

  In the first step 401, whether or not the area change command is a valid area change command, that is, by the user who is permitted to access the contents 1 and 2 (hereinafter also referred to as “regular user”). It is determined whether or not it has been issued. If the area change command is issued by a legitimate user, the determination here is affirmed, and the routine proceeds to step 403.

  Here, based on the password sent from the host device 90 as an example, it is determined whether or not the area change command has been issued by a legitimate user. This password is purchased by the user via the Internet, for example. When the user inputs a password via an input device (not shown) (for example, a keyboard) constituting the host device 90, the password is notified to the optical disc device 20. Note that the determination algorithm here is not particularly limited, and an algorithm equivalent to that performed by currently available application software or the like may be used. The password may be issued individually for the area change command, but as an example, as shown in FIG. 12B, a password (Password) may be added to the area change command.

  In this step 403, the position information of the TLO on the optical disk 15 (hereinafter referred to as “first TLO” for convenience), information on the accessible area (here, LWA recorded in the lead-in area), and file management information are stored. Save in RAM 41. That is, the state before the change is saved.

  In the next step 405, the attribute of the first TLO is changed from lead-out to data. As a result, as shown in FIG. 13A, dummy data is recorded in the area between the data A and the content 1. That is, the first TLO is invalidated.

  In the next step 407, the head address of the area where the lead-out added to the area change command is recorded, that is, the designated address is extracted. Here, it is assumed that the address following the end address of the content 2 (= start address of the rewritable area B) is extracted as the designated address.

  In the next step 409, it is determined whether or not the designated address is 0. Here, since the designated address is not 0, the determination here is denied, and the routine proceeds to step 411.

  In this step 411, TLO (hereinafter referred to as “second TLO” for convenience) is recorded in an area having the designated address as the head address. Here, as shown in FIG. 13B, the second TLO is recorded in the head area of the rewritable area B.

  In the next step 413, the end address of the accessible area is changed to the address immediately before the designated address. Here, as shown in FIG. 13C, the address immediately before the second TLO is set as a new LWA. That is, the LWA in the FDCB is rewritten to the address immediately before the second TLO. As a result, the content 1 and the content 2 are further included in the accessible area, and similarly to the data A, the content 1 and the content 2 can be accessed. In other words, the area composed of the rewritable area D1 and the read-only area D2 becomes a new accessible area after the change.

  In the next step 419, file management information of a file to be included in the new accessible area after the change is created. Here, the content 1 and the content 2 are respectively filed, and the file of the content 1 (referred to as “file C1”) and the file of the content 2 (referred to as “file C2”) are shown as an example in FIG. Each is stored in the root directory. In this case, as shown in FIG. 15, the file identification descriptor of the file A, the file identification descriptor of the file C1, and the file identification descriptor of the file C2 are recorded in the root directory. Then, the file entry of the file C1, the file entry of the file C2, and the like are recorded at predetermined positions. As a result, it is possible to access content 1 by following the route of root directory file entry → file C1 file identification descriptor → file C1 file entry → allocation descriptor → file C1 main body (content 1). Further, the content 2 can be accessed by following the route of the file entry of the root directory → the file identification descriptor of the file C2 → the file entry of the file C2 → the allocation descriptor → the file C2 main body (content 2).

  In the next step 421, the file management information created in step 419 is recorded in an area defined by the UDF standard on the optical disc 15.

  In the next step 423, the upper device 90 is notified of completion of the change of the accessible area. As a result, the user can access the content 1 and the content 2 via the host device 90.

  In the next step 425, it is determined whether or not there is an access request from the host device 90. If there is an access request, the determination here is affirmed and the routine proceeds to step 427.

  In step 427, processing corresponding to the access request (for example, loading (playback) of content 1 and content 2, rewriting of data A, etc.) is performed.

  In the next step 429, it is determined whether or not there is a request to eject the optical disk 15. If there is no request for ejecting the optical disk 15, the determination here is denied and the routine returns to step 425. On the other hand, if there is a request to eject the optical disk 15, the determination here is affirmed, and the routine proceeds to step 431.

  In this step 431, the information on the accessible area after the change and the file management information are returned to the information on the accessible area before the change and the file management information.

  In the next step 433, the TLO is recorded at the original position. Here, the attribute of the dummy data in the area where the first TLO is recorded is changed to lead-out.

  In the next step 435, ejection of the optical disk 15 is permitted. As a result, the optical disk 15 is ejected via a not-shown ejection drive system. Then, the access process ends.

  If the region change command has not been issued by a legitimate user in step 401, the determination here is denied and the process proceeds to step 441.

  In this step 441, the host device 90 is notified that the accessible area cannot be changed. Then, the access process ends.

  If the designated address is 0 in step 409, the determination in step 409 is affirmed and the routine proceeds to step 415.

  In this step 415, dummy data is recorded in an unrecorded area in the data area.

  In the next step 417, the end address of the accessible area is changed to the address immediately before the lead-out area. Here, the address immediately before the lead-out area is set as a new LWA. That is, the LWA in the FDCB is rewritten to the address immediately before the lead-out area. As a result, as shown in FIG. 13D, the entire data area becomes a new accessible area after the change. Then, the process proceeds to step 419.

  If there is no access request in step 425, the determination in step 425 is denied and the process proceeds to step 429.

  As is clear from the above description, in the optical disc device 20 according to the present embodiment, a control device and a processing device are realized by the CPU 40 and a program executed by the CPU 40. That is, the control device is realized by steps 403 to 421 and steps 431 and 433 in FIG. 11, and the processing device is realized by step 427.

  It should be noted that at least a part of each device realized by processing according to the program by the CPU 40 may be configured by hardware, or all may be configured by hardware.

  In the present embodiment, the program of the present invention is constituted by the access processing program among the programs stored in the flash memory 39. That is, the procedure that is changed by the program corresponding to the processing of steps 411 to 417 in FIG. However, the procedure that is invalidated by the program corresponding to step 405 and the procedure that is returned by the program corresponding to steps 431 and 433 are configured.

  In the access processing, the processing method according to the present invention is implemented. That is, the step of making clear through the processing of Steps 403 to 417 in FIG. 8, the step of creating in Step 419, and the step of recording file management information in the data area in Step 421 are performed. Further, when manufacturing the optical disc 15, a pretending step in the processing method according to the present invention is performed.

  As described above, according to the optical disc device 20 according to the present embodiment, the upper device 90 and the subsequent read-only regions are applied to the optical disc 15 that is manufactured so that there is no content recorded in the read-only region. If an area change command (change request) with the start address (designated address) of the area where the lead-out is recorded is received, if the area change command is issued by a legitimate user, The TLO (lead-out) attribute recorded in front of the read-only area is changed to data and invalidated, and the TLO is recorded in the area having the designated address as the head address, and is recorded in the lead-in area. Change LWA (end position of recorded area, end address of accessible area) to the address immediately before the specified address. It is. As a result, the read-only area is changed to an accessible area. As a result, only authorized users can access content recorded on the optical disc.

  Then, after changing the accessible area, each content recorded in the read-only area included in the new accessible area is converted into a file, and file management information is created. Recording on an optical disk. As a result, it becomes possible to access the content 1 and the content 2 recorded in the read-only area from the host device 90. Therefore, as a result, only authorized users can access content recorded on the optical disc from the host device 90.

  In addition, when there is a request to eject the optical disk 15, the information on the accessible area, the file management information, and the TLO are returned to the state before the change. Only the data A is copied, and it is possible to prohibit the copying of the content.

  In the above-described embodiment, the case has been described in which the address immediately before the lead-out area is set as a new LWA when the designated address is 0. However, the present invention is not limited to this. For example, when an address not included in the data area (for example, FFFFFFFFh) is set as the designated address, the address immediately before the lead-out area may be set as a new LWA.

  In the above embodiment, the case where the second TLO is recorded after changing the attribute of the first TLO to data in the access process has been described. However, the present invention is not limited to this, and the attribute of the first TLO is changed to data. The second TLO may be recorded before changing to.

  Moreover, although the said embodiment demonstrated the case where an accessible area | region was changed according to the designation | designated address added to the area | region change command, it is not restricted to this, For example, a designation | designated address may be preset. In this case, the designated address may not be added to the area change command. Further, information regarding the designated address may be recorded in advance on the optical disc 15.

  In the above-described embodiment, when the optical disk 15 is ejected, the information about the accessible area, the file management information, and the TLO are returned to the state before the change. However, depending on the importance of the content, the optical disk 15 When the file is ejected, the information regarding the accessible area, the file management information, and the TLO need not be returned to the state before the change. In this case, step 403, step 431, and step 433 in the flowchart of FIG. 11 are deleted as shown in the flowchart of FIG.

  In the above embodiment, the case where the optical disk apparatus 20 determines whether or not the area change command is issued by an authorized user is explained. However, even if this determination is performed on the upper apparatus 90 side. good. In other words, the area change command may be transmitted to the optical disc apparatus 20 only when the host apparatus 90 confirms that the area change command has been issued by a legitimate user. In this case, step 401 and step 441 in the flowchart of FIG. 11 are deleted as shown in the flowchart of FIG. Also in this case, depending on the importance of the content, when the optical disk 15 is ejected, the information regarding the accessible area, the file management information, and the TLO may not be returned to the state before the change.

  Moreover, although the said embodiment demonstrated the case where it was judged whether the area | region change command was issued by the regular user based on the password, it is not limited to this. For example, the determination may be made based on a key (change key). This key (change key) may also be purchased by the user via the Internet, for example.

  In the above embodiment, the case where the optical disk 15 is a hybrid disk has been described. However, the present invention is not limited to this, and the entire data area may be a rewritable area. That is, D2 in which content 1 and content 2 are recorded may be a rewritable area instead of a read-only area.

  Further, in the above embodiment, the case where the content 1 and the content 2 are continuously recorded has been described. However, as shown in FIG. 18A, for example, at least between the content 1 and the content 2 A rewritable area C having a size capable of recording TLO may be provided. In this case, as shown in FIG. 18B, only the content 1 can be included in the new accessible area. Therefore, for example, for a user who has content 1 as a basic function version and content 2 as an extended function version and only needs the basic function version, only content 1 is new as shown in FIG. As shown in FIG. 18 (C), contents 1 and 2 are included in the new accessible area for users who also need to be included in the accessible area. be able to. In addition, you may make it identify with a password, for example whether it is a user of only a basic function version, or a user who also needs an extended function version.

  In the above embodiment, the case has been described where the first TLO is invalidated by changing the attribute of the first TLO from lead-out to data. The TLO may be overwritten. In short, any data may be recorded.

  In the above embodiment, the operation code of the area change command is DDh. However, the present invention is not limited to this. Any operation code that is not currently in use may be used. In short, it suffices if the optical disk apparatus 20 can recognize the area change command.

  Moreover, although the said embodiment demonstrated the case where an area | region change command comprised in 12 bytes, it is not limited to this.

  In the above embodiment, the case where the designated address is set in bytes 5 to 8 of the area change command has been described. However, the present invention is not limited to this. It may be set. In short, it is sufficient that the designated address can be correctly extracted in the optical disc apparatus 20.

  In the above embodiment, the case where the start address of the area where the lead-out is recorded is set as the designated address in the area change command has been described. An address may be set. In short, information that can specify a new accessible area only needs to be added to the area change command. However, in this case, it is necessary to change the processing in steps 411 and 413 in FIG.

  As an example, as shown in FIG. 19A, movie information (video data) is recorded in D2 (read-only area) of the optical disc 15, and the digest version for evaluation and the accessible area are changed to D1. A program for purchasing a key (hereinafter referred to as “key purchase program”) may be recorded. In this case, for example, the optical disk 15 is distributed as a free sample in a video shop or the like, and a user who is interested in seeing the digest version for evaluation activates a key purchase program and purchases a key via the Internet, for example. Then, the key is used to prove that the user is a legitimate user like the password in the above embodiment, and D2 is changed to an accessible area. Thereby, the user who purchased the key can see the movie information. That is, the key purchase price is the movie information price. Similarly, as shown in FIG. 19B as an example, music information (album, concert) may be recorded in D2, and its sample version (trial listening version) and key purchase program may be recorded in D1. In this case as well, the user who has purchased the key can listen to (or watch) the music information in the same manner as the movie information described above. Further, book information such as a novel may be recorded in D2, and the outline and key purchase program may be recorded in D1.

  In the above embodiment, for example, when the area change command is not issued by a legitimate user, all or part of the data A may be excluded from the accessible area.

  Further, the accessible area may be moved. For example, in FIG. 19A and FIG. 19B described above, when the accessible area is changed, only D2 may be set as the accessible area.

  Further, in the above embodiment, for example, when the usage period of content is limited, the change of the accessible area is prohibited when the preset usage period has elapsed since the change of the accessible area for the first time. May be. In this case, the change of the accessible area may be permitted by purchasing a new password.

  In the above embodiment, for example, when the number of times the content is used is limited, if the number of changes after the first change of the accessible area reaches the preset number of times, the change of the accessible area is performed. May be prohibited. In this case, the change of the accessible area may be permitted by purchasing a new password.

  In the above embodiment, the case where the access process is performed after receiving the area change command has been described. However, the present invention is not limited to this. For example, the access process may be performed when the host device 90 accesses an area other than the accessible area.

  Moreover, although the case where temporary lead-out was used as lead-out was demonstrated in the said embodiment, normal lead-out may be sufficient.

  In the above embodiment, the program according to the present invention is recorded in the flash memory 39, but is recorded in another recording medium (CD, magneto-optical disk, DVD, memory card, USB memory, flexible disk, etc.). May be. In this case, the program according to the present invention is loaded into the flash memory 39 via the playback device (or dedicated interface) corresponding to each recording medium. Further, the program according to the present invention may be transferred to the flash memory 39 via a network (LAN, intranet, Internet, etc.). In short, it is sufficient that the program according to the present invention is stored in the flash memory 39.

  In the above embodiment, the case where the optical disk 15 is a DVD-type optical disk has been described. However, the present invention is not limited to this, and for example, a next-generation information recording medium corresponding to light having a wavelength of about 405 nm. It may be.

  Moreover, although the said embodiment demonstrated the case where the optical disk 15 had one recording layer, it may have not only this but a several recording layer. In this case, a recording layer conforming to the CD standard and a recording layer conforming to the DVD standard may be mixed. The access process described above may be performed on at least one of the plurality of recording layers.

  In the above embodiment, the case where the optical pickup device includes one semiconductor laser has been described. However, the present invention is not limited thereto, and for example, a plurality of semiconductor lasers that emit light beams having different wavelengths may be included. In this case, for example, at least one of a semiconductor laser that emits a light beam with a wavelength of about 405 nm, a semiconductor laser that emits a light beam with a wavelength of about 660 nm, and a semiconductor laser that emits a light beam with a wavelength of about 780 nm may be included. . That is, the optical disk apparatus may be an optical disk apparatus that supports a plurality of types of optical disks that conform to different standards. At this time, the access process described above may be performed on at least one of the plurality of types of optical discs.

  As described above, the processing method of the present invention is suitable for enabling only authorized users to access content recorded on an optical disc. Also, the optical disc apparatus of the present invention is suitable for enabling only authorized users to access content recorded on the optical disc. In addition, the program and the storage medium of the present invention are suitable for causing the optical disk apparatus to allow only authorized users to access content recorded on the optical disk.

1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention. It is FIG. (1) for demonstrating the file structure in UDF. It is FIG. (2) for demonstrating the file structure in UDF. It is a figure for demonstrating the information area in the optical disk of FIG. It is a figure for demonstrating the lead-in area | region of FIG. FIG. 6 is a diagram for explaining an FDCB recorded in an inner disk identification zone in FIG. 5. It is a figure for demonstrating the detail of the content descriptor specific in FIG. It is a figure for demonstrating the accessible area | region before a change. FIG. 9 is a diagram (part 1) for describing a file structure corresponding to FIG. 8; FIG. 9 is a diagram (No. 2) for describing a file structure corresponding to FIG. 8; It is a flowchart for demonstrating an access process. FIG. 12A and FIG. 12B are diagrams for explaining the newly defined area change commands. FIG. 13A to FIG. 13D are diagrams for explaining the access processing, respectively. It is FIG. (1) for demonstrating the file structure after the change of an accessible area. FIG. 10 is a diagram (No. 2) for describing the file structure after the change of the accessible area. It is the modification 1 of the flowchart of FIG. It is the modification 2 of the flowchart of FIG. FIGS. 18A to 18C are diagrams for explaining access processing when there are two read-only areas. FIG. 19A and FIG. 19B are diagrams for explaining a distribution form when the contents are movie information and music information, respectively. It is a figure for demonstrating TLO.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 ... Optical disk, 20 ... Optical disk apparatus, 39 ... Flash memory (recording medium), 40 ... CPU (control apparatus, processing apparatus).

Claims (23)

A processing method for protecting content recorded in a data area of an optical disc,
A processing method including a step of temporarily setting an end position of an already recorded area in the data area in front of the content so as to make the drive device appear not to exist.   2. The method according to claim 1, further comprising the step of changing the end position to a position behind the content in response to the change request for the end position and clarifying the existence of the content to the drive device. The processing method as described in.   The processing method according to claim 2, further comprising a step of creating file management information of files recorded up to the new end position after the change.   4. The processing method according to claim 3, further comprising a step of recording the file management information created in the creating step in the data area. The optical disc has a read-only area and a recordable area,
The processing method according to claim 1, wherein the area in which the content is recorded is the read-only area.   6. The processing method according to claim 5, wherein the recordable area is an area in which recorded contents can be rewritten. An optical disc apparatus capable of handling an optical disc in which an accessible area in the data area is limited and an area in which content in the data area is recorded is not included in the accessible area,
A control device that changes the accessible area so that the area in which the content is recorded can be accessed in response to a change request;
An optical disc device comprising: a processing device for performing the content reproduction processing.   8. The optical disc according to claim 7, wherein the control device further creates file management information of a file recorded in a new accessible area after the change, and records the file management information in the data area. apparatus.   9. The optical disc according to claim 7, wherein the control device invalidates the lead-out when the lead-out is recorded in a new accessible area after the change. apparatus.   The optical disk apparatus according to claim 9, wherein the control device invalidates the lead-out by changing an attribute of the lead-out to data. The change request is a change request in which an address after the area where the content is recorded is added as a designated address,
The optical disk apparatus according to claim 7, wherein the control device changes the accessible area according to the designated address. The designated address is the top address of the area where the lead-out is recorded,
12. The optical disc apparatus according to claim 11, wherein the control device changes an end address of the accessible area to an address immediately before the designated address.   The said control apparatus returns the area | region which can be accessed after the said change to the area | region which can be accessed before a change when the said optical disk is discharged | emitted further, It is any one of Claims 7-12 characterized by the above-mentioned. An optical disk device according to the above. A program used in an optical disc apparatus capable of handling an optical disc in which an accessible area in the data area is limited and an area in which content in the data area is recorded is not included in the accessible area,
A program for causing a control computer of the optical disc apparatus to execute a procedure for changing the accessible area so that the area in which the content is recorded can be accessed.   15. The program according to claim 14, further causing the control computer to execute a procedure for creating file management information of a file recorded in a new accessible area after the change.   16. The program according to claim 15, further causing the control computer to execute a procedure for recording the file management information created in the creating procedure in the data area.   15. The control computer further causes the control computer to execute a procedure for invalidating the lead-out when the lead-out is recorded in a new accessible area after the change. The program according to any one of 16.   The program according to claim 17, wherein the control computer is caused to execute a procedure for changing the attribute of the readout to data as the invalidation procedure.   19. The control computer is further caused to execute a procedure for returning the area that can be accessed after the change to the area that can be accessed before the change when the optical disk is ejected. The program as described in any one of.   20. The control computer is caused to execute a procedure for changing the accessible area based on a change request received in advance as the changing procedure. The program described in. The change request is a change request in which an address after the area where the content is recorded is added as a designated address,
21. The program according to claim 20, wherein the control computer is caused to execute a procedure for changing the accessible area in accordance with the designated address as the changing procedure. The designated address is the top address of the area where the lead-out is recorded,
The program according to claim 21, wherein the control computer is caused to execute a procedure of changing the end address of the accessible area to an address immediately before the designated address as the changing procedure. A computer-readable recording medium on which the program according to any one of claims 14 to 22 is recorded.

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