CN1304913C - Method and system for controlling access to components of multimedia - Google Patents
Method and system for controlling access to components of multimedia Download PDFInfo
- Publication number
- CN1304913C CN1304913C CNB008067155A CN00806715A CN1304913C CN 1304913 C CN1304913 C CN 1304913C CN B008067155 A CNB008067155 A CN B008067155A CN 00806715 A CN00806715 A CN 00806715A CN 1304913 C CN1304913 C CN 1304913C
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- 238000000034 method Methods 0.000 title claims description 22
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000004590 computer program Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 101100464779 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CNA1 gene Proteins 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2141—Access rights, e.g. capability lists, access control lists, access tables, access matrices
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Multimedia (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Signal Processing (AREA)
- Technology Law (AREA)
- Databases & Information Systems (AREA)
- Health & Medical Sciences (AREA)
- Bioethics (AREA)
- General Health & Medical Sciences (AREA)
- Human Computer Interaction (AREA)
- Storage Device Security (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
An apparatus (100) presenting a multimedia scene that is represented in an electronic form. The apparatus has a retrieval module (120) for retrieving a scene description (134), possibly from a remote server (128). The scene description includes a component identification (140), identifying a component (136) comprising content for the scene, and a conditional access identification (144), for determining access rights to the component. The conditional access module (122) of the apparatus determines the access rights to the component. If the determined access rights allow, the apparatus retrieves the content of the component and presents the scene including the content of the retrieved component.
Description
Technical field
The present invention relates to a kind of device that presents a scene of representing with a kind of electronic form.
The invention further relates to a kind of method that presents a scene of representing with a kind of electronic form.
The invention further relates to a computer program and an a kind of storage medium that is loaded with such computer program of carrying out this method.
The invention further relates to a device that produces a scene description.
The invention further relates to a kind of method that is used to produce a scene description.
The invention further relates to a kind of storage medium that is loaded with such scene description.
Background technology
Multimedia of reproduction presents and may relate to several key elements on similar products such as computing machine.This presents may comprise the various video and/or the image areas that may combine with audio fragment.Well knownly a kind of like this multimedia descriptions is described with a kind of so-called scene description.(SMIL 1.0 standards REC-smil-19980615), are that a kind of suitable language is used for defining such scene description to the synchronous multimedia integrate language that is defined by WWW association.This scene description has been stipulated a plurality of assemblies, and the content of these assemblies has constituted the content of this scene, for example some image that will show on screen and an audio fragment that will be played.In addition, this scene description has been stipulated the mutual relationship between these assemblies, and for example how some image will be placed on the screen and where be placed on screen, and when must play some audio fragment.In the realization of a use SMIL, this content description is the file of a SMIL form, and stand-alone assembly is other corresponding document of appropriate format, and for example image is GIF and jpeg format, and audio fragment is a MP3 format.One presents engine and analyzes this scene description document, and during presenting this scene, reads a component file where necessary.A representative instance of system architecture comprises a server computer, resident in the above this scene description document and component file; And a client computer, carry out this thereon and present engine.This client computer can connect via network, for example via Internet, visit this server computer.A kind of system that presents a scene based on a kind of like this client-server structure has been described in the International Patent Application WO 99/39272.The interaction that this system provides user and this to present scene allows this user to choose a specific sub-scene.Should be selected as an order from client's send server to begin new presenting.
Consider that the content of its value can be protected by a conditional access system.The permission of a kind of like this system has obtained according to the user, the authority on these contents is used these contents.This means that some component file can be by certain user visit and can not be by other certain user's visit.When file of request, the conditional access system of control this document is checked active user's authority and is only provided this document under the condition that those authorities allow.Alternatively, this component file can be encrypt and must use a decryption key correctly to reproduce this content.If this user right allows then, this conditional access system will provide this key.Under the situation of encrypt file, short of available decryption key, this document is useless, so file itself can freely be obtained by everyone.
Summary of the invention
An object of the present invention is to provide a kind of utilization presents a scene to effective processing of access rights device.According to the present invention, can in a device, achieve this end, wherein this device comprises: the reading device that is used to read a scene description, this scene description comprises a component identification and a conditional access sign, this component identification is used to identify an assembly, a described assembly comprises the content of scene, and this conditional access sign is used to identify the access rights to a described assembly; Conditional access is determined device, is used for definite access rights to a described assembly; And present device, be used for presenting the scene of the content that comprises a described assembly according to these access rights.Owing to identify the fact that is comprised in this scene description for the conditional access of locking assembly, therefore need not visit this assembly itself or its multiplexed authority that just can determine this assembly content of user capture for one.In addition, the authority that just can directly set up an assembly of user capture when analyzing this scene description is advantageous, because if the content of an assembly be it seems disabled words, just can revise this immediately and present.The predetermined content that such modification can be replaced this assembly by a remainder, other assembly of relocating; Amplify other assembly and fill most of this screen; The perhaps content of pretending to lose with certain additive method.Advantage according to this device of the present invention is that the conditional access sign that need not obtain this assembly from the outside of this scene description just can be carried out such modification.
According to an embodiment of device of the present invention, in said apparatus, this conditional access sign comprises a system banner, in order to identify the conditional access system of a described component accesses authority of control.By stipulate the sign of this conditional access system in this scene description, this device can be operated in more than one conditional access system.Different scene descriptions and composition assembly can be protected by different conditional access systems, but they still can present according on the device of the present invention.
According to an embodiment of device of the present invention, said apparatus comprises other reading device and is used for reading a described assembly content according to access rights.In this embodiment, determine that by this scene description the access rights of this assembly are to have benefit especially, because it has avoided reading this assembly under the situation that does not have access rights to exist.Connect on the remote computer of this device via a network if this assembly is stored in one, this has just been avoided once the invalid of this assembly being read, thereby has saved the valuable network bandwidth.
An embodiment according to device of the present invention, in said apparatus, this scene description comprises an other component identification, other component identification is used to identify an other assembly, a described other assembly comprises the content of scene, this other reading device is configured to determine that at conditional access device determines a described assembly is not had under the situation of access rights that the content that reads a described other assembly is as substituting.Its advantage is: the specific user at this scene description does not have (no longer including) to using another available assembly as an alternative under the situation of original component accesses authority.This device is directly determined this situation by verify these access rights based on the sign of the conditional access in scene description, and the assembly that this substitutes is read in decision subsequently.An example of this situation is: this original assembly is a high-definition picture by the protection of conditional access authority, and this replacement assembly is an image that low resolution is freely used.
Further aim of the present invention provides a kind of utilization presents a scene to effective processing of access rights method.According to the present invention, can achieve this end by comprising following steps in one approach: read a scene description, wherein this scene description comprises a component identification and a conditional access sign, this component identification is used to identify an assembly, this assembly comprises the content of scene, and this conditional access sign is used to identify the access rights to this assembly; Determine access rights to this assembly; And the scene that presents the content that comprises this assembly according to these access rights.Owing to can from this scene description itself, obtain for the conditional access sign of locking assembly for one, so can carry out immediately existing or non-existent any action based on access rights.This has been avoided consulting this assembly that may remote location at some or has consulted the multiplexed of this assembly.
Further object of the present invention provides a program and is used to realize utilizing the method that effective processing of access rights is presented a scene.According to the present invention, can be loaded into a computer program in the digital machine internal storage by one, can achieve this end, wherein this product comprises software code and partly is used for: when described product moves on digital machine, carry out the step according to method of the present invention.Connect via a network, download this program, can in local computer, obtain this program from the remote computer that a memory device at it has such program.Process of downloading can be on the local memory device storage this program, therefrom can load be used for after the execution process; Or load the process that this program is used for carrying out immediately in the storer of local computer.In addition, this program can obtain by reading it the storage medium that is loaded with this program from, and wherein this storage medium can be bought and be used for this purpose.
Further object of the present invention provides a device that produces a scene description, and this scene description allows to utilize the effective processing to access rights to present this scene.According to the present invention, can in a device, achieve this end, wherein this device comprises: tracing device is used to prepare a scene description, this scene description comprises one first component identification, identify a content and be used for first assembly of this scene, and a conditional access sign, be used for definite access rights to this first assembly; And output unit is used for exporting this scene description with the form of a computer program.
Further object of the present invention provides a kind of method that is used to produce a scene description, and this scene description allows to utilize the effective processing to access rights to present this scene.According to the present invention, can achieve this end by comprising following steps in one approach: prepare a scene description, wherein this scene description comprises one first component identification, be used for first assembly of this scene to identify a content, and a conditional access sign, be used for definite access rights to this first assembly; And export this scene description with the form of a computer program.
Description of drawings
By means of one exemplary embodiment and respective drawings, the present invention and advantage thereof will further be illustrated, wherein:
Fig. 1 has shown that schematically one presents the device of scene according to the present invention, and
Fig. 2 has schematically shown a device that produces a scene description according to the present invention.
Embodiment
Corresponding in the drawings feature has used identical label symbol to represent.
Fig. 1 has schematically shown a device that presents a scene according to the present invention.Device 100 is realized according to a known Computer Architecture.This device has the machine instruction that a processor 102 is used for carrying out a program that is loaded into working storage 104.This system further has an interface 106 and is used for communicating with peripherals.Article one, bus 108 is used for swap data and instruction between the different assemblies of this device.The peripherals of this device comprises that comprises a storage medium 110 of wanting executive routine.This storage medium 110 can be a hard disk or other any suitable media, as a CD, a chip card or a tape.As the alternative method of loading procedure from this storage medium 110, can connect 112 via a network and download this program.The peripherals of this device further comprises a display 114 and is used to show the image of this scene and the audio frequency that loudspeaker 116 is used to play this scene.In addition, this device has an input equipment 118, and keyboard for example is used to allow this user input commands.
This device can be carried out the difference in functionality of being realized by corresponding software module.The part of these software module programs, and this program is loaded in the working storage 104 when this device is started by a user.This device has one first read module 120 and is used to read the scene description that will present scene, and conditional access module 122 is used for determining the access rights of the different assemblies of this scene description.In addition, this device has the assembly that one second read module 124 is used for reading according to this scene description necessity.This device has one and presents module 126, is used in fact presenting the content of this scene description and read assembly.Diverse ways these functions that distribute in different software modules are arranged, and above-mentioned distribution only is an example.For example might merge to this first read module and second read module in the module, this module can read scene description and different assemblies.
In the embodiment shown in fig. 1, scene description and assembly are kept on the remote server computer 128, and device connects 130 via network and is connected with it.This server has a memory device 132 and comprises scene description document, and for example scene description document 134, and component file, for example component file 136 and component file 138.The scene description of this example comprises one first component identification 140, to identify one first assembly, its content will be read out and be included in this scene, and one second component identification 142, to identify one second assembly, its content will be read out and be included in this scene.In addition, this scene description comprises a conditional access sign 144 for this first assembly, for conditional access system identifies this first assembly.
The operation of device 100 is as described below.Software module 120-126 is loaded in the storer 104, wherein there is no need beginning to load all modules, can delay to load them before needs some in them.Then, generally based on certain user's input, this first read module 120 is read scene description 134 from server 128.During handling this scene description, it determines that the content of assembly ' CMP1 ' is the part of this scene.The content that it also determines ' CMP1 ' be protection and also it have conditional access sign 144.Visit to this assembly is under the control of conditional access system ' CA1 ' in this case, and this assembly is discerned with numeral ' 123 ' in that system.This conditional access module 122 is based on the definite access rights to this first assembly 136 of this information.If these access rights allow, second read module 124 is read this first assembly 136 from server 128.If these access rights do not allow visit, just do not read this first assembly and this device can take a suitable action to deal with this situation, for example replace it with a replacement assembly, perhaps in this scene, rearrange other assembly.Can determine access rights based on the information in this scene description itself, make and to determine such adjusting action at once and need not consult other resources and search this conditional access sign and become possibility.One wherein this conditional access be identified at this server level, for example in this assembly itself in the available system, even without access rights, promptly find there is not such authority, also need to read this assembly.The present invention has avoided unnecessary like this assembly to read, thereby has saved the time and the network bandwidth.Because a common component file has a big relatively size, these savings are considerable.
Scene description in this embodiment of the invention is prepared according to SMIL 1.0 standards.This multimedia language by World Wide Web association definition (SMIL 1.0 standards, REC-smil-19980615).In that language, the special test attribute that the conditional access of assembly sign can easily be provided by SMIL adds in the assembly.In addition, SMIL has one＜switch〉element, it allows the calculating based on this testing attribute, selects between two assemblies.4.3 joints of SMIL 1.0 standards have been described＜swirch〉element, and also 4.4 joints of these SMIL 1.0 standards have been described this testing attribute.Below be some statements in the example, it has shown an audio-frequency assembly by a conditional access system protection, and if the active user do not visit the authority of original audio-frequency assembly, an alternative audio-frequency assembly.
<smil>
<head>
…
…
</head>
<body>
…
…
<switch>
<audio?src＝“audiol”system-access-id＝“CA1：123”/>
<audio?src＝“audiol-replacement”system-access-id＝″ free：0″/>
</switch>
…
…
</body>
</smil>
If the calculated value of the first testing attribute system-access-id is true, then this presents engine and knows have access rights to visit this audiol assembly, and reads this assembly and be used for playing.If the calculated value of the first testing attribute system-access-id is false, does not just have access rights and read the audiol-replacement assembly.
Fig. 2 has schematically shown a device that produces a scene description according to the present invention.Device 200 is to realize according to a structure that is similar to device 100.Device 200 has a describing module 202 and is used to prepare a scene description 134.This scene description comprises one first component identification 140, identifying first assembly that a content is this scene part, and one second component identification 142, to identify second assembly that a content is this scene part.In addition, this scene description is used to conditional access system to identify this first assembly for this first assembly comprises a conditional access sign 144.Device 200 further has an output module 204 and is used to export ready scene description.The scene description of this output can send to another computing machine via network connection, and this scene description can be performed or store at there.In addition, the scene description of this output can be stored on the local storage medium, for example on storage medium 110.
This scene description comprises the explanation of a scene.It has been described and what will present and how to present these.In this respect, it comprises the instruction that is used to present program, presents routine processes and how to present.Presenting engine is similar to the mode that one of interpreter analysis comprises Program Introduction Document and analyzes this scene description with a kind of.Therefore, we can say that this scene description can load on the suitable computing machine that presents program at one carries out.
There is several method to be used for sending this content to the client from server.It can be based on the request and the transmission of individual files, and application program of the present invention is in this case determined access rights, and it there is no need to visit the component file on server.Another kind is that it is sent as a multiplex signal to the method that the client sends this content.This can be a broadcasting multiplex signal, and many like this clients can receive identical signal, or a direct multiplex signal, wherein have only an independent client can ask some information.In broadcasting realized, application program of the present invention was determined access rights, and it there is no need to visit the multiplexed of this assembly.Because do not need decoding and calculate that those are multiplexed, so can save resource.In directly realizing, application program of the present invention is determined access rights, and it there is no need to require the multiplexed of this assembly.In like manner this has also saved resource and has been connected bandwidth with network.
It should be noted that embodiment described above only is used for explanation rather than restriction the present invention, and those those skilled in the art of the present technique can design the embodiment of many replacements and not deviate from the scope of accessory claim book.In these claims, be placed on any label symbol in the bracket and will can not be counted as and limit this claim.Speech " comprises " not to be had to get rid of except being listed in an element or step in the claim, also has other element or step to exist.The existence of a plurality of such unit do not got rid of in speech before a unit " ".The present invention can utilize the hardware that comprises several clear and definite unit to come reality, also can utilize a suitable procedure control computer to realize.In an equipment requirements of enumerating several means, some these device can be included in the same part of hardware.
Claims (5)
1. device that presents a scene of representing with electronic form, this device comprises:
-reading device, be used to read a scene description, this scene description comprises a component identification and a conditional access sign, and this component identification is used to identify an assembly, a described assembly comprises the content of scene, and this conditional access sign is used to identify the access rights to a described assembly;
-conditional access is determined device, is used for definite access rights to a described assembly; And
-present device, be used for presenting the scene of the content that comprises a described assembly according to access rights.
2. device as claimed in claim 1 is characterized in that: this conditional access sign comprises a system banner, in order to identify a conditional access system of controlling the access rights of a described assembly.
3. device as claimed in claim 1 comprises other reading device, is used for reading according to access rights the content of a described assembly.
4. device as claimed in claim 3, it is characterized in that: this scene description comprises an other component identification, this other component identification is used to identify an other assembly, a described other assembly comprises the content of scene, its feature also is: this other reading device is configured to determine that at conditional access device determines a described assembly is not had under the situation of access rights that the content that reads a described other assembly is as substituting.
5. method that presents a scene of representing with electronic form, this method comprises following steps:
-reading a scene description, this scene description comprises a component identification and a conditional access sign, and this component identification is used to identify an assembly, and this assembly comprises the content of scene, and this conditional access sign is used to identify the access rights to this assembly;
-definite access rights to this assembly; And
-present the scene of the content that comprises this assembly according to access rights.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99204541 | 1999-12-24 | ||
| EP99204541.9 | 1999-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1364249A CN1364249A (en) | 2002-08-14 |
| CN1304913C true CN1304913C (en) | 2007-03-14 |
Family
ID=8241097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008067155A Expired - Fee Related CN1304913C (en) | 1999-12-24 | 2000-12-11 | Method and system for controlling access to components of multimedia |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1171812A1 (en) |
| JP (1) | JP2003527704A (en) |
| KR (1) | KR100781907B1 (en) |
| CN (1) | CN1304913C (en) |
| WO (1) | WO2001069350A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003304523A (en) | 2002-02-08 | 2003-10-24 | Ntt Docomo Inc | Information delivery system, information delivery method, information delivery server, content delivery server, and terminal |
| JP4705324B2 (en) * | 2003-12-26 | 2011-06-22 | 富士通株式会社 | Data operation method |
| JP2008146479A (en) | 2006-12-12 | 2008-06-26 | Toshiba Corp | Software component, software component management method and software component management system |
| CN101222371B (en) * | 2008-01-24 | 2012-08-22 | 中国海洋大学 | Client terminal component operation management system |
| FR2930662B1 (en) * | 2008-04-23 | 2010-05-21 | Streamezzo | METHOD OF SECURING AN EVOLVING SCENE, DEVICE, SIGNAL AND CORRESPONDING COMPUTER PROGRAM, METHOD OF UPDATING AN EVOLUTIVE SCENE, CORRESPONDING DEVICE AND COMPUTER PROGRAM |
| CN105389364B (en) * | 2015-11-06 | 2020-02-04 | 中国科学院自动化研究所 | Digital cultural relic safety sharing system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3372611B2 (en) * | 1993-10-18 | 2003-02-04 | キヤノン株式会社 | Video transmission system, video processing device, and video processing method |
| CA2272649A1 (en) * | 1996-11-21 | 1998-06-11 | Jordan J. Glogau | Web site copy protection system and method |
| US6073124A (en) * | 1997-01-29 | 2000-06-06 | Shopnow.Com Inc. | Method and system for securely incorporating electronic information into an online purchasing application |
| US6535919B1 (en) * | 1998-06-29 | 2003-03-18 | Canon Kabushiki Kaisha | Verification of image data |
-
2000
- 2000-12-11 KR KR1020017010828A patent/KR100781907B1/en not_active IP Right Cessation
- 2000-12-11 CN CNB008067155A patent/CN1304913C/en not_active Expired - Fee Related
- 2000-12-11 JP JP2001568162A patent/JP2003527704A/en not_active Withdrawn
- 2000-12-11 EP EP00993833A patent/EP1171812A1/en not_active Withdrawn
- 2000-12-11 WO PCT/EP2000/012541 patent/WO2001069350A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001069350A1 (en) | 2001-09-20 |
| EP1171812A1 (en) | 2002-01-16 |
| KR20010113711A (en) | 2001-12-28 |
| KR100781907B1 (en) | 2007-12-04 |
| CN1364249A (en) | 2002-08-14 |
| JP2003527704A (en) | 2003-09-16 |
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