WO2002065296A1 - Systeme de distribution de contenu - Google Patents

Systeme de distribution de contenu Download PDF

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Publication number
WO2002065296A1
WO2002065296A1 PCT/JP2002/001247 JP0201247W WO02065296A1 WO 2002065296 A1 WO2002065296 A1 WO 2002065296A1 JP 0201247 W JP0201247 W JP 0201247W WO 02065296 A1 WO02065296 A1 WO 02065296A1
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WO
WIPO (PCT)
Prior art keywords
segment
content
distribution
client terminal
terminal device
Prior art date
Application number
PCT/JP2002/001247
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English (en)
Japanese (ja)
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WO2002065296B1 (fr
Inventor
Norio Inoue
Original Assignee
Staralpha Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Staralpha Inc. filed Critical Staralpha Inc.
Publication of WO2002065296A1 publication Critical patent/WO2002065296A1/fr
Publication of WO2002065296B1 publication Critical patent/WO2002065296B1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/958—Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism

Definitions

  • the present invention relates to a content distribution system, and for example, relates to a content distribution system, such as a network device, a storage medium storing a content distribution program, and a storage medium storing a client terminal program.
  • a content distribution device that distributes content to users via a network, a client terminal device that uses content, a storage medium that stores a content distribution program, and a client terminal program are stored. It relates to a storage medium.
  • '' Landscape technology In recent years, multimedia has been rapidly advancing along with the IT revolution. This will enable various data to be distributed over a common network by digitizing data and networks.
  • One of the factors behind the adoption of multimedia in the information and communication field is the spread of the Internet. ': At present, it is possible to access information all over the world and exchange information with people all over the world as soon as a personal computer (hereinafter referred to as PC) equipped with multimedia functions is connected to the Internet. Is possible.
  • PC personal computer
  • the content distribution device and the client terminal device of the user are connected via the network.
  • the distribution and use of digital content by the content distribution device is limited to three methods: (1) a batch E-mail system, (2) a streaming system, and (3) a composite content system based on file aggregation. ing.
  • the time required to deliver 1.2 [gigabytes] of digital content over a 1 [megabit / second] high-speed line is approximately 9600 [seconds] (2 (Time 40 minutes) This indicates that it is practically difficult to use.
  • the security methods for content protection include (i) a method of setting file access rights on the content distribution device to prevent unauthorized downloads, and (ii) encrypting the entire contents and unauthorized use of those without a decryption key. (Iii) Embedding specific elements when creating content, and using the dedicated application program on the client terminal device when using content to prevent unauthorized use. There is. '
  • the content is divided into minute units, and these minute units are sequentially distributed from the content distribution device to the client terminal device from the beginning of the content.
  • the distributed content is processed in parallel with the reception by a dedicated application program corresponding to the content, and the processing result is transmitted to the user Provide one. .
  • the processing of the content gives the same result as if it existed on the client terminal device.
  • This streaming method is often used for music distribution and video distribution, but only when the content can be used sequentially from the beginning.
  • Content protection security methods include (i) a method of setting file access rights on the content distribution device to prevent unauthorized use, and (ii) a method of encrypting the entire content and having no decryption key. It employs a scheme to prevent unauthorized decryption. '.
  • the contents are configured as independent files, and are called and used from the application program of the small client terminal device in accordance with the contents specified in the parent contents.
  • a transmission request is issued, and the file is batch-distributed or streamed and processed by the application program. The result is provided to the user.
  • the batch-delivered files are partially saved in the client terminal device and used directly when reused (eg, WebCont ents).
  • WebCont ents e.g. WebCont ents
  • the distribution time is dispersed by dividing the content, but the total wait time is different from the batch distribution method because the on-demand method is used in which the distribution request is issued when all the contents are used. Absent.
  • the distribution of the content of each component is the same as the batch distribution method, there is a practical limit on the size.
  • (B) Content protection security method The security method of content protection can be set for each component content. However, since they were independent files, they had to set the protection contents and protection method separately.
  • contents are required to be interactive and tend to move from single file contents to composite contents composed of multiple types of contents.
  • composite contents have a single content due to the ease of management such as sales and delivery.
  • the media format and the entire file are combined into a single file, which results in a huge file size to be distributed.
  • Sophisticated digital content is, of course, a commodity that requires payment and needs protection from theft and unauthorized use during delivery. 'At the same time, we need samples that are widely available for free to promote. As a result, the development of digital content for Internet distribution was accompanied by a large load.
  • the above-mentioned batch distribution method or streaming method presupposes the distribution of a single type and a single file, and uses the whole at once or processes and uses the data sequentially. As a result, even if the network becomes broader and broader, it will contribute to increasing the size of the condensate or be used only for improving the quality of streaming.
  • an interruption point (good) is established. If the rights conditions are not satisfied, the subsequent use of U is prohibited, and a part of the content will be provided as a sample. There are ways to protect the rest. In this case, the entire file is delivered, whether or not the user purchases it, resulting in unnecessary delivery time and requiring unnecessary load on the external storage of the user's client system. become. As a result, the number of samples that can be used for sales promotion was limited, and the effect was lost.
  • the present invention has been made in view of the above points, and realizes a delivery state of content substantially equivalent to that on a client terminal device without transferring the entire content to a client terminal device.
  • the present invention provides a content distribution system, a content distribution device, a client terminal device, a content distribution program, and a content distribution device program which realize security measures for protecting a right of each portion of the content which can be set after the content is created. Is intended to
  • the present invention relates to a content distribution device and a client terminal device which are connected via a network, and which transmits content distributed from the content distribution device to a client.
  • Content distribution system that can be used in the terminal device,
  • the content distribution device includes
  • Batch distribution means for collectively distributing the content / segment file segments specified in
  • 'transfer means for transferring the requested segment from the content / segment file
  • the client terminal device includes
  • segment data is used.
  • the look-ahead means issues a segment transfer instruction in accordance with designation of distribution information of a segment table for the segment accessed by the use processing means.
  • the present invention provides a content distribution device capable of distributing content to a client terminal device
  • All data of element content that constitutes content is divided into addressable units to create segment data, and header information is added to the segment data to form segments, and the segments are aggregated Content '' Segment
  • a segment table that describes information on the distribution and use of each segment in the content segment file
  • Batch delivery means for batch delivery of segments
  • a transfer unit for transferring a requested segment from the content segment file in response to a request from the client terminal device.
  • the present invention uses the segment data if there is segment data in the content file fetched by batch distribution based on the information of the segment table fetched by batch distribution, and otherwise distributes the segment to the content distribution device.
  • Request processing means for receiving a segment from the content distribution device upon request and using the segment data;
  • Read-ahead means for issuing a transfer instruction of an untransferred segment necessary for the next process and automatically sequentially receiving untransferred segments from the content distribution device;
  • the look-ahead means issues a segment transfer instruction in accordance with designation of distribution information of a segment table for the segment accessed by the use processing means, or transfers the segment after the segment accessed by the use processing means It consists of a means to issue a command
  • this pre-reading means is a client terminal device that works independently of segment use processing.
  • the present invention provides a client terminal device provided with a segment arranging means which is periodically started, deletes a segment determined not to be resident in accordance with the use status on the segment table, and completes the transfer.
  • the present invention uses the segments obtained by the on-demand transfer, records the use status, updates the distribution status recorded in the fetched segment table, and also uses the use status of each segment.
  • the client terminal device has means for recording on the segment table.
  • the present invention provides a unit security unit that makes segment data available only when a segment use request is issued, access restriction is indicated by an instruction on a segment header, and a condition indicated by a segment table is satisfied.
  • a client terminal device with a means.
  • the present invention provides a storage medium storing a content distribution program capable of distributing content to a client terminal device,
  • All data of the element content that composes the content is divided into addressable units to create segment data, and header information is added to the segment data to form a segment, and this segment is aggregated.
  • Content '' Segment file
  • the content stores a segment table that describes information on distribution and use of each segment in the segment file
  • a computer-readable program for realizing a computer to realize a batch distribution function of batch-distributing segments of a content segment file and a transfer function of transferring a requested segment from the content segment file in response to a request from the client terminal device It is a storage medium that stores a possible content distribution program.
  • the present invention uses the segment data if there is segment data in the content file fetched by batch distribution based on the information of the segment table fetched by batch distribution, and otherwise distributes the segment to the content distribution device.
  • a request processing function for receiving a segment distribution from the content distribution device upon request and using the segment data;
  • FIG. 1 is a block diagram showing a content distribution system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a content distribution device according to the first embodiment of the present invention.
  • FIG. 3 is a block diagram showing a client terminal device according to the second embodiment of the present invention.
  • FIG. 4 is a diagram for explaining a hierarchical structure of a segment 'table according to the embodiment of the present invention.
  • FIG. 5 illustrates the operation of the content distribution system according to the embodiment of the present invention.
  • FIG. 6 is a flowchart for explaining the batch distribution operation of the co-distribution system according to the embodiment ′ of the present invention.
  • FIG. 1 is a block diagram showing a content distribution system according to an embodiment of the present invention.
  • a content distribution system 1 includes a content distribution device 3 and client terminal devices 5,... Connected via a network 7. This content can be used on the client terminal device 5.
  • FIG. 2 is a block diagram showing a content distribution device according to the first embodiment of the present invention.
  • the content distribution device 3 includes a server system 30 as shown in FIG.
  • the server 'system 30' consists of a central processing unit (CPU), ROM (read only memory), main memory, I / O ports, hard disk drive, and other devices.
  • This server 'system 30 is designed to run on software written in a programming language such as Java.
  • the server / system 30 can send contents to the client terminal device 5 via the network 7.
  • this server system 30 stores a content segment file 31 and a segment table 32.
  • the content segment file 3 1 is divided into addressable units for all the data of the element content constituting the content 3 3 to form the segment data 3 4, and the segment data 3 4 is added to the segment header 3. 5 is added to form a segment 36, and the segment 36 is collectively stored.
  • the segment table 32 includes a content information header as shown in FIG. One 37, and the segment information 39, ... related to the distribution and use of each segment 36, ... of the content "segment file 31" corresponding to the addresses 38, ... are described.
  • the server ′ system 30 receives the advance batch distribution to the client terminal device 5 or the first access from the client terminal device 5 as shown in FIG. At this time, the segment table 32 and the portion of the content segment file 31 specified in the segment table 32 are simultaneously distributed. " And s transfer means for transferring a set of requested segments 36 from the content segment file 31 in response to a request from
  • FIG. 3 is a block diagram showing a client terminal device according to the second embodiment of the present invention.
  • the client terminal device 5 may be composed of, for example, a desktop computer, a notebook computer, a D-STB (digital set-top box), a mobile phone, and a PDA (portable information terminal).
  • the computer must include at least a central processing unit (CPU), a main memory, input / output ports, and a hard disk device, and have a mechanism for controlling processing such as a keyboard and a mouse. is there.
  • the computer includes a communication device such as a terminal adapter for connecting to the Internet, and is connected to the content distribution device 3 via the network 7 to perform communication.
  • the client terminal device 5 is, for example, a client terminal program operating on an operating system ⁇ such as trademarked windows 98, windows-me, windows-NT-Workstation, windows-2000, etc. Operate.
  • the segment data 34 If the client terminal device 5 has segment data 34 in a partial set of the content segment files 31 A fetched by batch distribution based on the information of the segment table 32 A fetched by batch distribution, the segment data 34 If not, request delivery of the segment 36 to the server / system 30 and send the One-part system 30 receives distribution of segment 3 6, uses processing means 51 that uses the received segment data 34, and untransferred segment data 3 4 required for future processing A read-ahead means 5 2 for receiving a segment 36 which has not been transferred from the server / system 30 by issuing a sequential transfer command independently of the use processing means 5 1 to the set, and a segment use request
  • the security means 53 that enables the use of the segment data 34 only when the conditions specified by the segment tuples 3 and 2 for which access restriction is indicated by the instruction on the segment header 35 are satisfied. It has.
  • the read-ahead means 52 includes a segment read-ahead means specified in advance or a segment read-ahead means based on a use situation.
  • the pre-specified segment prefetch means issues a sequential delivery command to a set of prefetch target segments starting from the segment 36 specified by the segment table 32 before being distributed from the distribution server at once.
  • the segment prefetching means according to the use status issues a sequential transfer request to a segment set starting from the segment to which the use means has issued the transfer request.
  • All data of the element content that constitutes the content is divided into segments and data, and header information is added to each segment and stored as a file in the server or system. '' '
  • Segment file 31 is composed of a set of segments 36, 36,. Segment 36 includes segment header (header information) 35 and segment data 34.
  • the “segment data 34” is configured by dividing all data of the element content constituting the content 33 into predetermined units. By adding a segment header (header information) 35 to the segment data 34, a segment 36 is configured. A set of these segments 36 is stored in the server system 30 as a content segment finale 31. Note that there may be a plurality of content segment files 31 for one content 33.
  • the “segment header 35” includes special processing before the application program of the client terminal device 5 uses the segment data 34 and before the processing indicated by the segment table 32 or processing of the processing. Information indicating that it must be completed later is written. The information consists of a special process ID and the data needed to perform it.
  • segment data 34 includes data obtained by dividing the element content file.
  • the segment data 34 may be encrypted.
  • Segment Table 32 contains information on the distribution and use of each segment.
  • the “segment table 3 2” includes a content information header 37, an address 38 of each segment, and segment information 39 on distribution and use of each segment.
  • the “contents information header 37” includes a content identification ID, content attribute information, and default information for each segment process.
  • the “segment address 38” is logical address information used by the application to identify the segment.
  • the server address information indicating the recording position on the server system 30 and the recording position on the client terminal device 5 are indicated. It is the physical address information shown.
  • the “logical address information” includes a group identification ID (logical file ID) indicating a group of segments and an address within the group indicating a position in the group. Note that one logical file may be used without group identification.
  • the above “server address information” includes the server identification information on the server “.system 30”, the content segment file 31 identification information on the server “system 30”, and the server identification information on the server “system 30”.
  • the “physical address information” includes information on the position recorded on the client terminal device 5 after the segment is distributed.
  • Segment information includes distribution processing information, post-distribution processing information, and usage processing information.
  • the “distribution processing information” has information that prescribes a distribution method, includes a target for collective distribution at the beginning, necessity of completion of distribution at the time of collective distribution, prohibition of local recording after distribution, Specify the necessity of encryption / decryption after distribution, the method of decryption, processing instruction information before local recording, and the completion status of distribution.
  • the “post-distribution processing information” has information for prescribing the processing after the distribution is completed, and designates a pre-read start segment or the like specified in advance.
  • the “usage processing information” has information for defining processing before or after passing the segment data to the application of the client terminal device 5, and it is necessary to decrypt the segment encryption. , Decryption method, segment 'data type, special processing method for rights protection, usage status, or pre-processing instruction information.
  • the order of the rows of the segment table 32 is summarized for each content segment file 31 and is arranged in the order of the segments 36 in the content segment file 31.
  • the segment table 32 may be a single table or may have a hierarchical structure with a plurality of tables.
  • a separate table (child segment table 32b) is added to the address 38a, which is the address information of the parent segment table 32a.
  • the branch information 3 2 aa and the position information 32 ab at the head of the child segment table 32 b are set, and the child segment table identification information 32 ac is set in the segment information 39.
  • the last line of the child segment table 32b has the branch information to the parent segment table 32a, the leading position 32bd, and the parent segment table information 32be.
  • the branch information 32b to another table (grandchild segment table 32c) and the head of the grandchild segment table 32c
  • the location information 3 2 bb is set, and the segment information 39 is set with the grand segment table table identification information 32 bc.
  • Grandchild segment table 3 The last line of 2c has the branch information to the child segment table 32b, the return position 32cd, and the parent segment table information 32ce.
  • each segment 'table 32a, 32b, 32c has a content information header 37a, 37b, 37c.
  • Content information header 37a, 37b, 37c contains the identifier of the content part represented by each segment table 32a, 32b, 32c. I have.
  • Content attribute information is attribute information of the content portion represented by each segment 'table 32a, 32b, 32c.
  • each segment 36 In the default information for the processing of each segment 36, the processing default of each segment of each segment 'tape 32a, 32b, .32c is set.
  • the default value of each segment process is inherited from the parent segment table and has priority from the current segment table to the parent.
  • the server / system 30 stores the content segment file 31 having the above-mentioned contents, and the segment and the table ⁇ Table 32, and makes it possible to use the content based on this information. .
  • FIG. 5 is a diagram for explaining the operation of the content distribution system of the present invention.
  • the 'server of the content distribution device 3' system 30 transmits the stored segment table 32 to the network 7. Batch transmission to the client terminal device 5 via the Internet (step 102). '
  • the client terminal device 5 After the batch transmission command (step 201), the client terminal device 5 receives the segment 'table 32 sent from the content distribution device 3 (step 202) 0
  • the client terminal device 5 After receiving the segment table 32, the client terminal device 5 (step (Step 202) Instructs to batch-distribute a predetermined range of the content segment file 31 based on the segment information 39 in the segment table 32 (step 203).
  • the client terminal device 5 After receiving the segment table 32, the client terminal device 5 searches the segment table 32 for a logical address at the address 38 in the segment table 32, and then searches the segment table 32 for an index 301 for searching the storage position in each row. Create (step 204).
  • the index 301 is grouped for each identification ID of the group of logical address information at the address 38 in the segment 'table: 32', and arranged in the order of the addresses in the group. The order between the group IDs is arbitrary.
  • the client terminal device S sets a pre-specified background processing start point queue 30 2, 30 2,. Then, the background processing start point queues 303, 303, ... according to the use status are created (step 205).
  • the server 30 of the content distribution device 3 After transmitting the segment tape 32 (step 102), the server 30 of the content distribution device 3 transmits the segment tape 32 (step 102). All specified contents of the contents of the content segment file 31 are transmitted (step 103). Note that, in the server 'system 30 of the content distribution device 3, if the transmission is required to be completed in the batch distribution in the segment information 39, the transmission must be completed.
  • the content distribution device 3 collectively receives the segments 36 in the range of the specified content segment file 31 from the client terminal device 5 (step 206). In addition, the content distribution device 3 determines the necessity of encryption / decryption after distribution in the distribution information of the segment table 32, the decryption method, and the The processing specified by the processing instruction information is performed (step 2007), and thereafter, the segment 36 is locally transferred (the client terminal device 5).
  • step 208 If recording to-is not prohibited (step 208; NO), recording is performed on a local (client terminal device 5) external recording medium (step 209). At that time, the physical address information of segment 36 and the distribution completion status of segment 36 Segment of device 5 ⁇ Recorded in table 32A.
  • step 208 If recording on the local device (client terminal device 5) is prohibited (step 208; YES), the local memory (client terminal device 5) is not written to the external medium. Only the above is processed (step 210).
  • a segment use request from the application program of the client terminal device 5 is waited until batch distribution is completed (access wait).
  • a content use start request issued before the advance batch distribution is performed or a use request without the first segment address (the segment table is not present in the client terminal device 5, and the content name and A request with only content server 'system 30' first issues a batch delivery request to server 'system 30'.
  • the server's system 30 performs batch transmission to the client terminal device 5.
  • the server / system 30 regards the use request to the segment 36 at the head of the segment table 32 after the completion of the batch transmission and processes the use request of the segment 36.
  • the content segment refers to a set of segments recorded on an external storage medium of the client terminal device 5.
  • an index 301 is an index for retrieving a row of the segment 'table 32A from a logical address.
  • the pre-specified background processing start point queue 3002 is a physical address queue of a segment row to start searching for a pre-specified background distribution 'target segment, and the background processing start point queue 303 according to usage is This is the physical address queue of the segment line that starts searching for the background distribution target segment based on the pre-designated usage status.
  • segment use request from application program of client terminal device 5 (Description of segment use request from application program of client terminal device 5).
  • the segment 'use request from the application program of the client terminal device 5 is issued with logical address information (group identification ID, group address).
  • a request to use only the group address information is interpreted as a request to use the logical address in order from the top of the group.
  • the server system 30 of the content distribution device 3 determines the segment data of the corresponding segment 36 of the content segment if the requested segment 36 has already been distributed based on the distribution status information of the segment 'table 32'. 3-4 is subjected to encryption / decryption processing, special processing for rights protection, and pre-use processing in the usage information set in segment information 39 of segment table 32.
  • the server 30 updates the usage information in the usage information of the segment information 39 of the segment table 32, and then transmits the processed segment data 34 to the application of the client terminal device 5.
  • the server 30 returns the type of the segment data in response to the request of the application program of the client terminal 5.
  • the server 30 sends the data of the segment that has not been delivered. If so, move to the next on-demand delivery.
  • the segment When the application program of the client terminal device 5 issues a request to use the segment, if the segment has not been delivered, the segment sends a request to distribute the segment at the server address in the address information in the table 32. Release to system 30. At this time, the distribution status in the distribution information of the segment information is set to on-demand distribution.
  • the requested server system 30 sends the requested segment 36 to the client terminal 5.
  • the server. System 30 monitors the distribution completion status during prefetch distribution or distribution by another, and after the distribution is completed by the mechanism, takes out the relevant segment from the content 'segment and regards it as having been distributed.
  • the segment 36 received in the main memory is After performing the processing specified by the necessity of encryption / decryption after distribution in the distribution information according to the segment information 39 in Table 3 2, the decoding method, and the processing instruction information before recording locally
  • the segment 36 is recorded on the external storage device such as the HDD of the client terminal device 5.
  • the physical address information of the segment 36 and the delivery completion status of the segment 36 are recorded in the local segment table 32A.
  • the process is performed only on the main storage of the client terminal device 5 without recording on the external storage device such as the HDD.
  • the application program of the client terminal device 5 is placed in a waiting state.
  • the segment data 34 includes the segment-decryption information in the segment information 39 in the segment information 39 of the table 32. Processing, special processing for the protection of rights, and foreground processing are applied.
  • the client terminal device 5 updates the usage information in the usage information of the segment 'table 32A, and then passes the processed segment data 34 to the application program. .
  • the client terminal device 5 returns the type of the segment data 34 in response to the request of the application program.
  • the segment corresponding to the on-demand 'delivered' segment ⁇ Put the physical address of the row in table 3 2 into the background processing start point queue 3 0 3 according to the usage status, and execute the background delivery according to the usage status to start.
  • the segment information of the segment table 32A on the client terminal device 5 is updated at the time of the segment distribution request, after the distribution is completed, and before the delivery of the segment data 34 to the application program.
  • Segment ⁇ The update of the segment information in Table 32A will be performed on the address information, physical address information, distribution information, distribution completion 'information, usage information, and usage status information after the distribution is completed.
  • the client terminal device 5 retrieves the segment for which the pre-specified prefetch instruction has been issued from the body, and records the physical position of the corresponding segmentTable 2 row in the pre-specified background processing start point queue 302, and pre-specifies Activate background distribution.
  • the pre-specified background distribution of the client terminal device 5 is taken out from the pre-specified background processing start point queue 302 and the distribution status of the corresponding segment 36 is inspected.
  • the client terminal 5 checks the row of the segment table 32A.
  • the client terminal device 5 When the pre-specified background distribution, the background distribution based on the usage status, or the on-demand distribution is being performed, the client terminal device 5 extracts the next pre-specified background processing start point from the queues 302, 303 and executes the processing. continue.
  • the client terminal device 5 When the distribution is not completed, the client terminal device 5 issues a distribution request of the segment of the server address in the address information of the segment table 32A to the server system 30. At this time, the client terminal device 5 sets the distribution status in the distribution information of the segment information to the predetermined background distribution.
  • the server system 30 receiving the above request transmits the requested segment 36.
  • the segment is recorded in the content segment of the client terminal device 5 unless recording to the mouth is prohibited. At that time, the physical address information of the segment and the distribution completion status of the segment are recorded in the local segment table 32A.
  • the client terminal device 5 is processed only on the local main memory without adding to the content segment.
  • the client terminal device 5 puts the line position of the next line on the segment 'table 32 A' into the predetermined background processing start point queue 302, extracts the next line position from the queue, and continues processing. I do.
  • the pre-designated background distribution executed on the client terminal device 5 It is executed in parallel with the application program and other processing, and is started up by the specified number. This processing is performed with an appropriate time interval to maintain the processing speed of the background processing.
  • the client terminal device 5 After completing the on-demand delivery, the client terminal device 5 puts the logical address of the on-demand delivered segment 36 into the background processing start point queue 303 depending on the use situation, and starts the background delivery based on the use situation. ,
  • the client terminal device 5 When performing background distribution based on the usage status, the client terminal device 5 takes out the background processing start point queue 303 depending on the usage status and checks the distribution status of the segment corresponding to the extracted information.
  • the client terminal 5 checks the row of the segment 'table 32A. '-The client terminal device 5 is transmitting the pre-specified background (in the case of ⁇ , the next line of the segment-tuple 32 A is checked.
  • the client terminal device 5 takes out the next pre-designated distribution point from the background processing queue 303 and continues the process when the background is being distributed or on-demand distribution depending on the usage status.
  • the client terminal device 5 issues a distribution request for the segment of the server address in the address information of the segment table 32A to the server system 30. At this time, the distribution status in the distribution information of the segment information is placed in the background distribution according to the usage status.
  • the requested server system 30 sends the requested segment 36 to the client terminal 5.
  • the client terminal device 5 for the received segment 36, the necessity of encryption / decryption after delivery in the segment information 39 in the segment .table 32A, the decoding method, and before recording in the local After performing the processing specified by the processing instruction information, if the local recording is not prohibited, the segment is recorded in the local content segment. At that time, the physical address information of the segment and the delivery completion status of the segment The status is recorded in the local segment 'table. 'On the other hand, if local recording is prohibited, content and segments are not added, and processing is performed only on the main memory of the client terminal device 5.
  • the client terminal device 5 puts the line position of the next line on the segment table 32A into the background processing start point queue 303 depending on the usage status, and from the background processing start point queue 303. Fetch the next line position and continue processing.
  • Background distribution according to usage is performed in parallel with application and other processing, and the specified number is activated. In addition, this processing is executed with an appropriate idle time to maintain the processing speed of the background processing.
  • the client terminal device 5 uses the pre-specified background 'delivery start point and the on-demand distributed segment as a base point to store the segment table 32 A , Successively undelivered segments are distributed in the background, and a background distribution chain is formed for each segment.
  • the pre-designated background distribution chain disappears when it encounters another background distribution chain.
  • the background distribution chain based on the usage status disappears when it encounters background distribution based on other usage status, but does not disappear in the pre-designated background distribution chain.
  • the client terminal device 5 issues a content use end request at the end of use of the application program, saves each background processing start point queue on an external recording medium, and transfers the background processing start point queue to the main storage from the external medium at the next content use start request. By playing back, background distribution can be continued.
  • Segment-based security is implemented by the following method.
  • the system 30 will use the decoding information in the distribution information for the segments that need to be decoded in accordance with the decoding method information for the segments that need to be decoded. And send it encrypted. At this time, it is decoded including the header information of the segment.
  • the client terminal device 5 performs decryption immediately after reception, including the header information.
  • the method of obtaining the key for encryption and decryption is included in the decryption method information.
  • the segment data 34 of the content segment file 31 is encrypted on the server system 30 .
  • the client terminal device 5 encrypts the segment data using the encryption method included in the local recording pre-processing information.
  • the necessity of encryption and the method of obtaining the key are also included in the local pre-recording information.
  • the client terminal device 5 performs decoding using the decoding method included in the pre-processing information.
  • the necessity of decryption and the key acquisition method are also included in the pre-processing information.
  • the segment data 34 is encrypted in the content segment-file 31 on the server 30.
  • the billing completion status must be set in the client system to use a certain segment, or the processing of another server must be completed to use a specific segment. be able to.
  • this segment By placing this segment at the beginning of a group of segments that are processed sequentially, a gate to use that does not satisfy the conditions can be created. Alternatively, by making this segment the part that the application always needs, if the conditions are not met, it is possible to use it as an application error and gate it for unauthorized use. '
  • This security method can be used to alter headers, restore segments and data, etc. Unless the encryption key and all the condition determination logic in the special processing are obtained, the client terminal device 5 cannot be broken.
  • the client terminal device 5 activates a low-level segment optimization mechanism. This local segment optimization mechanism starts in parallel with other processing and proceeds with an appropriate free time.
  • the client terminal device 5 searches the segment table 32A, deletes the segment 36 that has not been used for a specified time or more from the distributed segment 36 from the client terminal device 5, and deletes the segment table. 3
  • the delivery status of A is determined to be delivery incomplete. However, segments targeted for batch distribution are not deleted.
  • a function similar to that for transferring all files can be provided by combining the batch transfer means at the head and the pre-reading means specified in advance.
  • the prefetching means is performed in parallel with the execution of the application program. Untransferred segments required when executing the application program are transferred on demand, so that batch transfer and on-demand transfer can be mixed.
  • the user can treat the client terminal device as content to be transferred as a batch if left after the first access, and can continue to use it after the first access as content for on-demand transfer. Can also be used.
  • the previous reader in stages of the content by the use situation is to use the characteristics of the data to be to be in the content de 1 "data near neighbor to be used, the execution of the application 'program, transfer the user's think time of Interactions in Japanese
  • the waiting time decreases and the quality approaches that of local content.
  • the same effect as the streaming method may be obtained.
  • the pre-specified look-ahead method uses the property that data used, such as game * content, is localized for each phase of content use, and while the user is playing a certain stage, Read ahead the data of the next stage. As a result, it is possible to obtain the same quality as the content file on the mouth.
  • the batch download mechanism at the top makes it possible to provide the content part as a sample. Except for the first part, security is imposed and use by unauthorized users is prohibited, but only the first part can be opened to the public.
  • the distribution method can be set including the designation of the server 'system 30. I Therefore, since the server / system 30 can be changed for each segment, there is an advantage that the scalability of the server / system 30 is easily ensured, and partial update is easy.
  • Digital 'content is divided into addressable units (segments) and distributed for each segment, so distribution is performed in advance as a batch distribution and background distribution independent of the progress of the application program on the client terminal device.
  • the untransmitted segments can be delivered in advance while the end user uses the application program. This makes it possible to reduce the waiting time for content distribution for end users.
  • a security mechanism for rights protection can be introduced for each segment, and security can be set for each part of content after the content is created. .
  • the operation contents described in the content distribution system, the content distribution device, and the client terminal device according to the embodiment of the present invention are as follows.
  • Each program corresponding to each operation is executed by the content distribution system, the content distribution device, and the client. It is stored in the terminal device and operated using these programs.
  • a program obtained by combining at least one or more of the programs of the operations (content distribution device or client terminal device) described above may be stored in the storage medium.
  • the storage medium includes, for example, a flexible disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD_RW, DVD, magnetic tape, ROM cartridge, RAM memory card with battery backup, and flash memory. Includes molycartridges, nonvolatile RAM cards, etc.
  • This storage medium is a medium on which information (mainly digital data and programs) is recorded by some means. Anything can be used as long as the dedicated processor realizes a predetermined function. The same shall apply hereinafter.
  • network 7 has been described.
  • the present invention is not limited to this, and other communication lines, the Internet, or the like may be used. Industrial availability,
  • the content distribution device and the client terminal device are connected via a network, and the content distributed from the content distribution device can be used by the client terminal device.
  • the content distribution device configures segment data by dividing data of all of the elementary contents constituting the content into addressable units, configures a segment by adding header information to the segment data, and configures the segment.
  • the client terminal device uses the segment data if there is segment data in the content file fetched by the collective distribution based on the information of the segment table fetched by the collective distribution.
  • Content distribution device Requests the distribution of the segment, receives the distribution of the segment from the content distribution device, uses the segment data, issues a transfer instruction of the untransferred segment data required for the next processing, and transfers the segment data from the content distribution device.
  • access restriction is indicated by an instruction on the segment header and segment data can be used only when the conditions specified by the segment table are satisfied.
  • User If the client terminal device is left behind after the first access, it can be treated as batch transfer content, and if it is used continuously after the first access, it can be used as on-demand transfer content. In this way, security for protecting the rights of each content part that can be set after content creation can be realized. ⁇
  • all the data of the elementary content constituting the content are divided into addressable units to obtain segment data, and a header is added to the segment data.
  • a segment is formed by adding information, and a content ⁇ ⁇ ⁇ ⁇ segment file obtained by assembling the segment and a segment table describing information on distribution and use of each segment in the content ⁇ ⁇ ⁇ ⁇ ⁇ segment file are provided.
  • the storage medium storing the client terminal device and the client terminal program of the present invention, if there is segment data in the content file fetched by batch distribution based on the information of the segment table fetched by batch distribution, the segment data is used. If not, the server requests distribution of the segment to the server, receives the distribution of the segment from the content distribution device, uses the segment data, and issues a transfer instruction of the untransferred segment necessary for the next processing, and issues the content distribution.
  • access restriction is indicated by the instruction in the segment header and segment data is used only when the conditions specified by the segment table are satisfied.
  • the client terminal device if the client terminal device is left after the first access, it can be used as batch transfer content, and if it is used continuously after the first access, it can be used as on-demand transfer content. It is possible to obtain a content distribution device that can protect the right for each portion of the content that can be set after the content is created.

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Abstract

Cette invention concerne un appareil de distribution de contenu servant à distribuer une table de segments ainsi qu'un fichier de segments de contenu en mode de traitement par lots, et à transférer un segment demandé à partir du fichier de segments de contenu. Un appareil terminal client utilise des données de segments si elles sont présentes dans le fichier de contenu. Sinon, l'appareil terminal client reçoit une distribution d'un segment à partir de l'appareil de distribution de contenu pour utiliser des données de segment, et pré-lit un segment qui n'a pas été transféré. Une limite d'accès est indiquée par une indication située sur l'entête du segment et les données de segments peuvent être utilisées uniquement lorsqu'une condition indiquée par la table de segments est remplie.
PCT/JP2002/001247 2001-02-16 2002-02-14 Systeme de distribution de contenu WO2002065296A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-040343 2001-02-16
JP2001040343A JP2002244911A (ja) 2001-02-16 2001-02-16 コンテンツ配信システム、コンテンツ配信装置、クライアント端末装置、コンテンツ配信プログラムが格納された記憶媒体、及び、クライアント端末プログラムが格納された記憶媒体

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WO2002065296A1 true WO2002065296A1 (fr) 2002-08-22
WO2002065296B1 WO2002065296B1 (fr) 2002-12-12

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JP (1) JP2002244911A (fr)
KR (1) KR20030001429A (fr)
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KR100779985B1 (ko) 2006-04-27 2007-11-27 김동학 콘텐츠 보호 방법 및 시스템
JP5760046B2 (ja) * 2012-10-26 2015-08-05 グリー株式会社 先読みキャッシュ方法、先読みキャッシュシステム及びプログラム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08263439A (ja) * 1994-11-23 1996-10-11 Xerox Corp 複合ディジタルワークへのアクセス及び配給制御方法と複合ディジタルワークへのアクセス及び使用制御システム
JPH09185570A (ja) * 1995-12-27 1997-07-15 Nippon Telegr & Teleph Corp <Ntt> マルチメディアデータ取得再生方法及びシステム
JPH10143403A (ja) * 1996-11-12 1998-05-29 Fujitsu Ltd 情報管理装置および情報管理プログラム記憶媒体

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08263439A (ja) * 1994-11-23 1996-10-11 Xerox Corp 複合ディジタルワークへのアクセス及び配給制御方法と複合ディジタルワークへのアクセス及び使用制御システム
JPH09185570A (ja) * 1995-12-27 1997-07-15 Nippon Telegr & Teleph Corp <Ntt> マルチメディアデータ取得再生方法及びシステム
JPH10143403A (ja) * 1996-11-12 1998-05-29 Fujitsu Ltd 情報管理装置および情報管理プログラム記憶媒体

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WO2002065296B1 (fr) 2002-12-12
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CN1380611A (zh) 2002-11-20

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