JP2011237904A - Document data editing device, document data editing method, and information storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method by which data type can be identified without requring data decryption while preventing illegal copying of document data in a document data editing device which displays document data, and copies and manages some data through a user's operation.SOLUTION: A document data editing device encrypts data when copying and managing some document data through a user's operation. In doing so, relevant information between the original document data and some copied document data is managed using a relevant information list that can be cross-referenced, and data type information on the document data is included in the information in a management list. Thus, mutual document information and the data type of the original document can be promptly identified without document data decryption.

Description

  The present invention relates to a document data editing method, a document data reproducing method, and an information recording medium having an editing / input function for allowing a user to edit document data.

  It is possible to view so-called electronic book data (hereinafter referred to as document data) obtained by digitizing data such as paperbacks, books, comics, newspapers, magazines, etc. with various mobile information processing devices such as personal computers, mobile phone terminals, and smartphones. It can be done. Furthermore, there are many terminals called electronic papers called electronic papers that do not consume power during display and are equipped with devices with high visibility, specialized for browsing document data. . These devices can be read in the same way as reading document data that has traditionally been printed on paper, but they store several volumes of document data, are lighter than paper books, The document data can be obtained anytime, anywhere via the communication network.

  On the other hand, in newspapers and magazines as a type of document data printed on paper, while reading, or after reading them once, only favorite articles and important articles are cut out and collected separately. In many cases, such as so-called scrapping, personal partial document data is collected. When such an operation for creating a scrap of document data is performed on various information processing apparatuses displaying document data as digital data, the user's favorite is selected from the document data displayed on a display or the like. A method may be considered in which this part is copied and held as separate data. However, if such a method is simply realized as a function in a terminal, illegal duplication of document data including copyright will be facilitated. For this reason, there is a method in which document data is encrypted and stored so that document data displayed on a display or the like cannot be copied.

  For example, the following method is disclosed as a method for restricting illegal duplication of document data. Patent Document 1 discloses an apparatus, method, and system that replaces specific characters (words) with encrypted information in accordance with a predetermined regular expression rule list for data in document data so that the user cannot view the data. ing. Patent Document 2 discloses a system that authenticates with a server as a kind of method for managing unauthorized duplication of document data by digital rights management called various DRM (Digital Rights Management).

JP 2009-75722 A International Publication No. 98/27494

  By using methods such as Patent Document 1 and Patent Document 2, unauthorized duplication of document data can be prevented. On the other hand, when performing operations such as creating a scrap of document data as described above, if the partially extracted document data is encrypted, unauthorized duplication can be prevented. If decryption is not performed, there is a problem that the contents of the data are not known.

  For example, when document data is enlarged and displayed when the document data is configured in a predetermined document format, if the information is known in advance, processing such as initialization for rendering characters is performed. It is also possible to perform the process in parallel with the data decryption process, and to shorten the time until display. In addition, when scrap data is stored as image data, and the character code is included in the cut-out source data when it is enlarged, it can be re-rendered using the cut-out source data and enlarged for display. In this case, if there is information on whether or not a character code is included in the cut-out source, it is possible to perform high-speed processing without the need for data decoding.

  Therefore, in the present invention, in view of the above problems, in an apparatus having a document data display function, it is possible to grasp the type of data without decrypting the data during reproduction while preventing unauthorized duplication by encrypting the document data. An information recording medium, a document data editing device, a document data editing method, and a document data reproducing method are provided.

The information storage medium in the present application is extracted from document data, partial document data obtained by extracting a part of the document data, document information, and a cut-out source information management list including extraction information of partial document data for the document. A cut-out destination information management list including information on the partial document and information on the original document from which the partial document is extracted is recorded.

  In the above information storage medium, the document data and the partial document data are each encrypted, and the extraction source information management list and the extraction destination information management list include identification information for identifying the corresponding entries of both. It may be.

In addition, the document editing apparatus of the present application includes an input unit that receives a user operation input with respect to document data, a document data cutout unit that generates information for specifying a part of a region specified by the document data by the input unit, and a document Extraction source information management list including partial document data extraction information including partial document data and document data type information corresponding to a part of the area specified by the data and the document data cutout unit, and extracted partial document An information recording unit that records information and a cut-out destination information management list including the information of the document from which the partial document is extracted;
Is provided.

  In the information recording unit, the document data and the partial document data are encrypted and recorded, and the extraction source information management list and the extraction destination information management list include identification information for identifying the corresponding entries of both. It may be a thing recorded.

  In addition, the document editing method in the present application includes an input step for accepting a user's operation input for document data, a document data cutting step for generating information for specifying a specified partial area of the document data by the input step, and a document Extraction source information management list including partial document data and document data type information corresponding to the partial area specified by the data and document data extraction step, and extracted partial document data And an information recording step for recording a cut-out destination information management list including information on the document from which the partial document is extracted.

  The document data editing device can improve the user's usability by enabling the editing operation to cut out and copy a part of the displayed document data according to user's preference and manage it separately. It becomes.

  In addition, the document data edited and collected by cutting and copying is encrypted so that unauthorized duplication can be prevented. On the other hand, by managing the correlation information of the cutting source and cutting destination in a list, it can be expanded. Whether or not re-rendering is possible can be determined at a high speed when displaying, and the display can be performed at a high speed.

The figure which showed the structural example of the document data editing apparatus in Embodiment 1 FIG. 1 is a first diagram showing a screen configuration example of a document data editing apparatus according to Embodiment 1; 6 is a flowchart illustrating an example of an editing operation process performed by the document data editing apparatus according to the first embodiment. 7 is a flowchart showing an example of encryption key generation processing of the document data editing apparatus according to the first embodiment. Configuration example diagram of information management list in Embodiment 1 The figure which showed the structural example of the extraction source information management list | wrist in Embodiment 1 The figure which showed the structural example of the extraction destination information management list | wrist in Embodiment 1. FIG. 2 is a second diagram showing a screen configuration example of the document data editing apparatus in the first embodiment. 10 is a flowchart showing an example of cut-out data display processing of the document data editing apparatus according to the first embodiment. The figure which showed the example of a screen structure of the enlarged display of the cutting-out data of the document data editing apparatus in Embodiment 1 10 is a flowchart showing an example of an enlargement process of cut-out data display of the document data editing apparatus according to the first embodiment.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a document data editing apparatus 100 according to an embodiment of the present invention. The document data editing apparatus 100 includes a control unit 110, an information recording unit 120, an input unit 130, and an output unit 140. Digital equipment for use.

  The control unit 110 includes a unique information calculation unit 111, an encryption / decryption unit 112, a key calculation unit 113, and a document data cutout unit 114, and has functions for controlling various operations in the document data editing apparatus 100.

  The unique information calculation unit 111 has a function of calculating information unique to document data or information unique to partial document data selected by an editing operation of document data, and is configured by a hardware circuit or software. .

  The encryption / decryption unit 112 has a function of outputting encrypted data or plaintext data in accordance with various encryption algorithms such as AES (Advanced Encryption Standard) with key data and plaintext data or encrypted data as inputs. Consists of software. In addition, description of various encryption algorithms is omitted here.

  The key calculation unit 113 calculates the key data to be input to the encryption / decryption unit 112, the original data encryption key 124 recorded in the information recording unit 120, the unique information calculated by the unique information calculation unit 111, Hardware circuit or software provided with functions such as arithmetic processing based on the above.

  The document data cutout unit 114 identifies and identifies that the user has selected a part of the document data displayed on the output unit 140 via the input unit 130, and the corresponding partial document data from the original document data. The function to copy. The copy at this time may be the same copy as the document data itself, or may be converted into another format.

  The information recording unit 120 has a function of storing the cut data encryption key 121, the encrypted cut data 122, the cut destination information management list 123, the original data encryption key 124, the encryption source data 125, and the cut source information management list 126. A fixed or detachable information recording medium such as a semiconductor memory, a magnetic medium, or an optical medium. Although details are not described, these data may not be recorded on the same recording medium, or may be recorded on different media. The various encryption key data may be encrypted with another key, accessible via a special authentication process, or stored in a special area of the information recording medium.

  The cut-out data encryption key 121 is a value serving as a key element for encrypting cut-out document data, which is a part (cut-out part) of document data specified by the user operation from the input unit 130. The procedure for using the value will be described later.

  The encrypted cut-out data 122 is selected by the user via the input unit 130 as part of the document data displayed on the output unit 140, and the document data cut-out unit 114 identifies, specifies, and copies the selected data (hereinafter referred to as “encrypted cut-out data 122”). The partial data of the document data selected by the user is called cut document data), and the cut document data is encrypted data.

  The extraction destination information management list 123 is a list for managing correlation information with the extraction source information management list 126.

  The original data encryption key 124 is a key value used for encrypting document data.

  The encryption source data 125 is encrypted document data. The document data here refers to data obtained by adding image data or the like to data indicating characters expressed in a predetermined character code. For example, HTML (HyperText Markup Language) or XML (Extensible Markup Language) is used. ), Data described in a markup language, character type (font) and size determined for each application software, format including layout information, and the like. Note that the image data may be composed of image data such as JPEG. Examples of the content data include newspapers, magazines, and manga.

  The cut-out source information management list 126 is a list for managing information such as cut-out destinations and cut-out areas, correlation information with the cut-out destination information management list 123, and the like.

  The input unit 130 has a function of accepting an editing operation input from a user, for example, an input of a resistance film having a sensor function, various touch panels such as a capacitance, or a pen input device having an electromagnetic induction type function. Consists of devices.

  The output unit 140 is configured with various display devices such as a liquid crystal display, an organic EL display, and electronic paper. In this embodiment, the case where document data is handled has been described as an example. However, when the target data is other than document data, for example, image data, video data, audio data, etc., The output unit 140 only needs to realize a suitable output method corresponding to each data characteristic. For example, in the case of audio data or the like, the output unit 140 is realized by a speaker.

  Although not shown in detail here, other functions such as a battery or a power source, a switch, and an acceleration sensor are also included in the configuration of the document editing apparatus.

  FIG. 2 is a diagram showing an image of an editing operation by the user in the document data editing apparatus 100. FIG. 2 shows an example in which the document data editing apparatus 100 includes a two-screen output unit 140. Document data is displayed on the left screen 201, and the right screen 202 is a screen for copying and pasting a part of the document data displayed on the left screen. As shown in FIG. 2A, the user designates an area of a document among various pieces of document data displayed on the left screen 201 by using an input unit 130 such as a pen shape. In FIG. 2A, the area selected by the user with the pen is indicated by a dotted line. As shown in FIG. 2B, when the user moves the pen to the right screen 202, the selected area is copied and displayed on the right screen 202. If such an operation is repeated, a screen on which only document data according to the user's preference is pasted (copied) can be configured on the right screen.

  Next, a data processing sequence when the document data editing apparatus 100 is shown to cut out and copy a part of the user's favorite document data as shown in FIG. 2 in the document data editing apparatus 100 will be described with reference to FIG.

  (Step S <b> 301) The user selects a part of the document data displayed on the output unit 140 of the document data editing apparatus 100 using the input unit 130. The document data cutout unit 114 of the control unit 110 determines which portion of the document data corresponds to the selected data, and copies the determined document data to a buffer memory or the like that is managed internally. Further, the document data cutout unit 114 of the control unit 110 causes the output unit 140 to display cut document data corresponding to the operation locus of the input unit 130. Although details are not described here, it is assumed that the document data stored in the information recording unit 120 is decrypted with the corresponding encryption key and displayed on the output unit 140.

  (Step S302) Next, the unique information calculation unit 111 of the control unit 110 calculates unique information. The unique information here is information that can uniquely identify the document data displayed on the output unit 140, for example, an ID value that is uniquely assigned to the document data, information that is uniquely calculated from the document data, Specifically, it is a value calculated by hash calculation of the document data displayed on the output unit 140.

  (Step S303) Next, the key calculation unit 113 of the control unit 110 calculates an encryption key for encrypting the cut document data. The method for calculating the encryption key will be described in detail later.

  (Step S304) Next, using the encryption key calculated in step S303, the encryption / decryption unit 112 of the control unit 110 encrypts the cut document data stored in the buffer memory or the like according to a predetermined encryption algorithm such as AES. Turn into.

  (Step S305) Next, the control unit 110 creates a cut-out destination information management list 123 and a cut-out source information management list 126 for cut-out document data. The structure of the list will be described in detail later.

  (Step S306) Next, the control unit 110 records the encrypted cut document data and the first encryption key calculated in step S303 in the information recording unit 120. When recording, it may be stored in a form conforming to various file system structures such as FAT file system and UDF, or may be stored through a special authentication process provided in the information recording unit 120. I will omit the detailed description here.

  Next, a detailed processing sequence of step S303 will be described as detailed processing of the key calculation unit 113 in the document data editing apparatus 100 with reference to FIG.

  (Step S401) The key calculation unit 113 of the control unit 110 of the document data editing apparatus 100 generates a first key composed of a 128-bit random value using a random value generation function or the like.

  (Step S <b> 402) Next, the key calculation unit 113 acquires 128-bit unique information from the unique information calculation unit 111. Since the calculation method of the unique information is as described above, the description here is omitted.

  (Step S403) Next, the key calculation unit 113 performs an exclusive OR (XOR operation) process on the value of the first key calculated in step S401 and the unique information acquired in step S402.

  (Step S404) Next, the key calculation unit 113 acquires the second key as the calculation result of Step S403. This second key corresponds to the encryption key shown in step S303.

  Next, the configuration of the extraction source information management list 123 and the extraction destination information management list 126 will be described with reference to FIG. FIG. 5 is a diagram showing the relationship between information managed by the extraction source information management list 123, information managed by the extraction destination information management list 126, document data, and extraction data.

  The extraction source information management list 123 includes combinations of extraction source document data identification information, extraction source document data information, extraction area coordinate information, extraction destination document data specification information, extraction destination information management list entry number, and extraction destination document data information. Are managed for each cut-out area.

  The extraction source document data specifying information is information for specifying which document data is extracted from among the document data managed by the information recording unit 120. The storage location of the document data in the information recording unit 120, This is information indicating the corresponding page number.

  The source document data information includes information indicating whether or not the character code is included in the source document data, format information of the source document (format information determined for each application software, etc.) Information such as information indicating whether a character code is used.

  The cut-out area coordinate information is data managed by information such as stroke information indicating the cut-out area. The stroke information is information composed of a plurality of coordinate information of X and Y coordinates, such as (X1, Y1), and an area can be specified by connecting the coordinates with a straight line.

  The cut-out document data specifying information is information for specifying where cut-out data is included in the cut-out data managed by the information recording unit 120.

  Extraction destination information management list entry No. Is information indicating the number in the extraction destination information management list 126 where information related to the extraction data is stored.

  Cut-out document data information is information indicating whether or not the character code is included in the cut-out document data, format information of the cut-out document (format information determined for each type of application software, etc.) Information such as information indicating whether a character code is used.

  FIG. 6 is a diagram showing a specific configuration example of the extraction source information management list 123.

  As the cut-out source document data specifying information, the document ID is 0x12345ABC, and the document data storage location is / DOC / DOC001. BOK and 10 are stored as the page number.

  As cut-out document data information, information 1 (= character code exists) indicating whether or not a character code is included in the cut-out source data, document format information 2 (= HTML data), and character code type 3 (= UNICODE) are stored. Has been.

  Stroke information such as (30, 50), (35, 70), (40, 80),..., (25, 45) is stored as the cut-out area coordinate information.

  0xABC12345 is stored as cut-out document data specifying information.

  Extraction destination information management list entry No. 1 is stored.

  Information 1 (= character code exists), document format information 2 (= HTML data), and character code type 3 (= UNICODE) indicating whether or not the character code is included in the cut-out source data are stored as the cut-out document data information. ing.

  Next, the configuration of the cutout information management list 126 in FIG. 5 will be described. The cut-out destination information management list 126 includes cut-out document data specifying information, paste destination area center coordinate information, cut-out document data information, cut-out document data specifying information, cut-out information management list entry No. The combination of the cut-out source document data information is managed for each cut-out area.

  The cut-out document data specifying information is information for uniquely specifying the cut-out document data.

  The paste destination region center coordinates are values that are indicated by two parameters such as the X coordinate and the Y coordinate. A description of the method for calculating which position of the region information specified in an arbitrary form is the center coordinate will be omitted here.

  Cut-out document data information is information indicating whether or not the character data is included in the cut-out document data, format information of the cut-out document (format information determined for each application software, etc.), This is information such as information indicating which character code is used.

  The extraction source document data specifying information is information for specifying which document data is extracted from among the document data managed by the information recording unit 120. The storage location of the document data in the information recording unit 120, This is information indicating the corresponding page number.

  Extraction source information management list entry No. Is information indicating in what position the cut-out information is stored in the cut-out source information management list 123.

  Cut-out source document data information is information indicating whether or not a character code is included in the cut-out source document data, format information of the cut-out source document (format information determined for each application software, etc.), This is information such as information indicating which character code is used.

  FIG. 7 is a diagram showing a specific configuration example of the cut-out destination information management list 126.

  0xABC12345 is stored as cut-out document data specifying information.

  (100, 200) is stored as the paste destination area center coordinates.

  Information 1 (= character code exists) indicating whether or not the character code is included in the cut-out data as cut-out document data information, document format information 2 (= HTML data), and character code type 3 (= UNICODE) are stored. ing.

  The document ID (0x12345ABC) is specified as the cut-out source document data specifying information, and / DOC / DOC001. BOK and 10 are stored as the page number. Cut-out source information management list entry No. 1 is stored.

  Information 1 (= character code exists), document format information 2 (= HTML data), and character code type 3 (= UNICODE) indicating whether or not a character code is included in the cut-out source data are stored as cut-out document data information. ing.

  Based on these pieces of information, data managed by the cut-out destination data 0xABC12345 is located at the center coordinates (100, 200), and / DOC / DOC001. The data on the 10th page of BOK indicates that the data is managed by the information of the first entry of the extraction source information management list entry. In addition, the cut-out source data indicates that the document format is HTML data that includes UNICODE character code information, not image information. Although the above example is shown here as document data information, the information storage method is not limited. Any information can be used as long as the data type can be determined.

  FIG. 8 is a diagram illustrating an operation example of the document data editing apparatus 100 when browsing cut-out document data information. FIG. 8A shows a display example in which the menu of the document data editing apparatus 100 is displayed on the screen 201 on the left side, and cut document data information is selected using a pen-type device. On the screen 202 on the right side, as cut document data information, for example, three pieces of information classified by file names are displayed as a list. FIG. 8B shows an example in which cut document data information is displayed. The left screen 201 shows an example of a screen configuration in which information of two pieces of cut document data is displayed as previous cut document data information, and handwriting information by a pen is further displayed.

  Next, a data processing sequence when the cut document data information is displayed on the output unit 140 of the document data editing apparatus 100 as shown in FIG. 8 will be described with reference to FIG.

  (Step S <b> 901) The input unit 130 of the control unit 110 of the document data editing apparatus 100 receives input from the user and determines cut document data to be displayed on the output unit 140.

  (Step S902) Next, the control unit 110 reads out the encrypted cut data 122 and the cut data encryption key 121 stored in the information recording unit 120.

  (Step S903) Next, the unique information calculation unit 111 of the control unit 110 calculates unique information. Since the calculation method of the unique information is as described above, the description here is omitted.

  (Step S904) Next, when the unique information calculation unit 111 cannot calculate the unique information, the process ends. Here, the case where the unique information cannot be calculated is a case where the unique information cannot be calculated because there is no document data based on the uniquely assigned ID value or information uniquely calculated from the document data. If the unique information can be calculated, the process proceeds to step S905.

  (Step S905) Next, the key calculation unit 113 of the control unit 110 calculates a decryption key from the unique information calculated by the unique information calculation unit 111 and the cut-out data encryption key 121 read from the information recording unit 120. Since the method for calculating the decryption key is the same as the method for calculating the encryption key, description thereof is omitted here.

  (Step S906) Next, the encryption / decryption unit 112 of the control unit 110 decrypts the encrypted cut-out data 122 read from the information recording unit 120 with the decryption key calculated by the key calculation unit 113, and normalizes the data.

  (Step S907) Next, the encryption / decryption unit 112 of the control unit 110 determines whether or not the encrypted cut-out data 122 has been correctly decrypted. If it cannot be decrypted correctly, the process is terminated. The case where the decryption cannot be performed correctly is a case where it is confirmed that the decrypted data is not the intended data. If it has been correctly decoded, the process proceeds to step S908.

  (Step S908) Next, the control unit 110 displays the decrypted data on the output unit 140.

  Next, an operation example when the user performs an enlargement display operation will be described with reference to FIG. FIG. 10A shows a display example in which information such as an operation menu related to screen display is displayed on the screen 202 on the right side of the document data editing apparatus 100, and “enlarged display” is selected. FIG. 10B shows a display example of enlarged data. On the screen 201 on the left side, the cut document data is enlarged and displayed.

  A data processing sequence when the cutout data is enlarged and displayed on the output unit 140 of the document data editing apparatus 100 as described above will be described with reference to FIG.

  (Step S1101) The input unit 130 of the control unit 110 of the document data editing apparatus 100 determines that an enlarged display request has been input as an input from the user.

  (Step S1102) Next, the control unit 110 reads the cut-out destination information management list 123 stored in the information recording unit 120.

  (Step S1103) Next, the control unit 110 determines whether the cutout data displayed on the output unit 140 is image data or document data from the cutout information management list 123 read in step S1102. If it is document data and the document data editing apparatus 100 has a function capable of enlarging the document data, the process proceeds to step S1106. Otherwise, the process proceeds to step S1104.

  (Step S1104) Next, the control unit 110 determines from the information managed in the extraction destination information management list 123 read out in step S1102 whether the document data of the extraction source is image data or document data. If it is document data and if the document data editing apparatus 100 has a function capable of enlarging the document data, the process advances to step S1105. Otherwise, the process proceeds to step S1108.

  (Step S1105) Next, the control unit 110 refers to the entry number of the extraction source information management list 126 from the extraction destination information management list 123 read out in step S1102, and acquires information such as a document data extraction area.

  (Step S1106) Next, the control unit 110 performs document data rendering processing and the like, and generates enlarged data related to the cut-out data portion.

  (Step S1107) Next, the control unit 110 displays the data generated in step S1106 or step S1108 on the output unit 140.

  (Step S1108) In step S1104, if the rendering process for enlarging and displaying the original document data cannot be performed, the control unit 110 recognizes the cut-out data as image data and generates enlarged image data.

  In the above sequence, the data decoding process is omitted for the sake of simplicity.

  As described above, by having the configuration of the extraction destination information management list 123 and the extraction source information management list 126, it becomes possible to quickly refer to each other's information, and to include information such as the document type in the information management list As a result, in order to change the display such as enlargement, the processing speed of the device can be improved, for example, the data can be decoded while the initialization process for the rendering process is performed.

  Although the configuration of the document data editing apparatus has been described in the present embodiment, it is needless to say that the present invention is not limited to the above-described embodiment. Implementation can be changed without departing from the spirit of the present invention. For example, the present invention includes the following cases.

  (1) In the present embodiment, a method has been described in which a cut-out data encryption key generates a random value and uses the value, but the same value as the original data encryption key is used, or the value of the original data encryption key is Alternatively, the calculation may be performed according to a predetermined calculation process.

  (2) In the present embodiment, as unique information calculated by the unique information calculation unit 111, an ID value uniquely assigned to document data, a hash operation value of document data as information uniquely calculated from document data, and the like However, any value can be used as long as it is unique data about the document to be extracted, such as document data before and after the extracted document data, data calculated from the document title and its page number, etc. .

  (3) In this embodiment, as unique information calculated by the unique information calculation unit 111, an ID value uniquely assigned to document data, a hash calculation value of document data as information uniquely calculated from document data, and the like However, the unique information may be device-specific information such as a device ID or a value uniquely assigned to each device.

  (4) In this embodiment, the key length for encrypting data and the unique information length are 128 bits, but any number of bits may be used. Also, the values may be different bit lengths instead of the same bit length.

  (5) In this embodiment, the key for encrypting the cut-out data is calculated by an exclusive logical (XOR) operation of the key value and the unique information, but the operation method is not limited. Any calculation method may be used.

  (6) In the present embodiment, an example is shown in which the unique information calculated by the unique information calculation unit 111 is re-encrypted using the unique information. However, the unique information may not be used. For example, a method of encrypting with a predetermined value or according to the encrypted data holding function of the information recording unit 120 special hot water may be used.

  (7) In the present embodiment, the configuration example of the cut-out destination information management list is shown, but the configuration may not be as described above. Any configuration may be used as long as information regarding data such as a document format and information indicating the information storage location of the corresponding extraction source information management list are stored.

  (8) In the present embodiment, the configuration example of the cut-out source information management list is shown, but the configuration may not be as described above. Any information may be used as long as information indicating the data storage location of the extraction destination information management list corresponding to the information related to data such as the document format is stored.

  In the document data editing apparatus and document data editing method according to the present invention, information such as the document type is prevented while preventing unauthorized copying of the document by encrypting and holding a part of the document data selected by the user. Since data is managed separately, data processing can be performed at high speed. Therefore, it can be applied to an information processing device having a function of editing document data.

DESCRIPTION OF SYMBOLS 100 Document data editing apparatus 110 Control part 111 Specific information calculation part 112 Encryption / decryption part 113 Key calculation part 114 Document data extraction part 120 Information recording part 121 Extraction data encryption key 122 Encrypted extraction data 123 Extraction destination information management list 124 Original data encryption Key 125 Encryption source data 126 Extraction source information management list 130 Input unit 140 Output unit 201 Screen on the left side of the document data editing device 202 Screen on the right side of the document data editing device

Claims (5)

Document data,
Partial document data obtained by extracting a part of the document data;
A cut-out source information management list including information on the document and extraction information of the partial document data for the document;
A cut-out destination information management list including information on the extracted partial document and information on the original document from which the partial document is extracted;
An information recording medium on which is recorded. The document data and the partial document data are respectively encrypted,
The cut-out source information management list and the cut-out destination information management list include identification information for identifying both corresponding entries.
The information storage medium according to claim 1. An input unit that accepts user operation input on document data;
A document data cutout unit that generates information for identifying a specified partial area of the document data by the input unit;
A cut-out source information management list including the document data, partial document data corresponding to the partial area specified by the document data cutout unit, and data type information of the document and extraction information of the partial document data An information recording unit that records information on the extracted partial document and a cut-out destination information management list including information on the document from which the partial document has been extracted;
Document editing device with   In the information recording unit, the document data and the partial document data are encrypted and recorded, and in the extraction source information management list and the extraction destination information management list, entries corresponding to both are included. The document editing apparatus according to claim 3, wherein identification information for identification is included. An input step for accepting user operation input on document data;
A document data cutting step for generating information for identifying a specified partial area of the document data by the input step;
Extraction source information management list including the document data, partial document data corresponding to the partial area specified by the document data extraction step, and data extraction information of the partial document data including the data type information of the document And an information recording step for recording a cut-out destination information management list including information on the extracted partial document and information on the document from which the partial document is extracted;
Document editing method with