JP2011234178A - Information recording medium, document data editing device, document data editing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which prevents illegal copying of document data in a document data editing device which displays document data and copies and manages a part of data by user's operation.SOLUTION: The document data editing device comprises a characteristic information calculation unit, and when copying and managing a part of the document data by user's operation, ciphers the data with a ciphering key and the value of the calculation result of a value calculated by the characteristic information calculation unit and manages the result. Since the characteristic information is obtained by calculating information characteristic to the document data, a key for correctly deciphering the partially copied data enciphered cannot be calculated if the document data has been deleted. Thus, the document data editing device and document data editing method can prevent illegal copying of the document data.

Description

  The present invention relates to a portable document data editing apparatus having a document data display function and an input function for allowing a user to edit document data, and a document data editing method in the apparatus.

  It is possible to view so-called electronic book data (hereinafter referred to as document data) obtained by digitizing data of books, manga, newspapers, magazines, etc., in various mobile information processing devices such as personal computers, mobile phone terminals, and smartphones. It is like that. 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

  Although both Patent Document 1 and Patent Document 2 describe a method for restricting browsing of document data and a method for preventing unauthorized copying of data, an operation for creating a scrap of document data as described above. It does not describe the configuration when performing the above.

  Accordingly, in the present invention, in view of the above problems, in a device having a document data display function, a part of document data displayed by a user operation can be cut out and managed separately while preventing unauthorized duplication of the document data. An object of the present invention is to provide a document data editing apparatus and a document data editing method for realizing such an editing operation.

  The information storage medium described in the present invention includes an encrypted original data obtained by encrypting document data, an original data encryption key used when encrypting the document data, and a cutout that is a part of the document data. Calculation of encrypted cut-out data obtained by encrypting document data and unique data calculated from the document, which is intermediate data required to calculate the encryption key required to generate the encrypted cut-out data The intermediate key for calculating the encryption key is stored.

  In addition, as another information storage medium, encrypted original data obtained by encrypting document data, an original data encryption key used when encrypting the document data, and cut out document data which is a part of the document data And encrypted cut data that is encrypted with an encryption key calculated by calculating the original data encryption key and unique information calculated from the document.

  A document data editing apparatus described in the present invention includes an input unit that receives a range for designating a cutout portion of document data from a user, a unique information calculation unit that calculates unique information unique to document data, and an encryption key generation unit. A key calculation unit that generates a key for encrypting the extracted document data specified by the input unit from the intermediate key that is intermediate data and the unique information, and the extracted document data is encrypted with the key generated by the key calculation unit And an encryption code part to be converted.

  In the document data editing apparatus, the key calculation unit may use an original data encryption key that is an encryption key for encrypting a document as an intermediate key.

  In the document data editing apparatus, the key calculation unit may use the unique information as a key for encrypting the cut out document data.

  The document data editing apparatus further includes an output unit for displaying and outputting the document, and the input unit specifies a range for designating a cutout portion of the document by designating a range on the output unit. There may be.

  In the document data editing apparatus, the unique information calculation unit may calculate an identifier of the apparatus as the unique information.

  The above invention can also be realized as a document data editing method realized on an editing apparatus.

  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, document data edited and collected by clipping / copying is stored after being encrypted, and at that time, it is encrypted with key data that cannot be correctly decrypted without the document data of the clipping source. It is also possible to prevent unauthorized duplication of document data.

1st explanatory drawing which showed the structure of the document data editing apparatus in Embodiment 1 of this invention 1st explanatory drawing which showed the example of a screen structure of the document data editing apparatus in Embodiment 1 of this invention First flowchart showing processing of editing operation of the document data editing apparatus according to the first embodiment of the present invention. Second flowchart showing processing of editing operation of the document data editing apparatus according to the first embodiment of the present invention. Second explanatory diagram showing an example of a screen configuration of the document data editing apparatus according to the first embodiment of the present invention. First flowchart showing cut-out data display processing of the document data editing apparatus according to Embodiment 1 of the present invention. 1st explanatory drawing which showed the structure of the document data editing apparatus in Embodiment 2 of this invention First flowchart showing processing of editing operation of the document data editing apparatus according to the second embodiment of the present invention. First flowchart showing cut-out data display processing of the document data editing apparatus according to Embodiment 2 of the present invention.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of document data editing apparatus 100 in the present embodiment. The document data editing device 100 includes document data including a control unit 110, an information recording unit 120, an input unit 130, and an output unit 140, such as a mobile phone terminal, a smartphone, an electronic dictionary, and an electronic book dedicated terminal. It is a digital device for mobile 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 a function of performing various operation controls 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 the 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 based on the intermediate key data 121 recorded in the information recording unit 120 and the unique information calculated by the unique information calculation unit 111. It is composed of hardware circuits or software having functions such as processing.

  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 information recording unit 120 has a function of storing the intermediate key data 121, the encrypted cut data 122, the original data encryption key 123, and the encrypted original data 124, and can be fixed or detachable such as a semiconductor memory, a magnetic medium, and an optical medium. An information recording medium. Although details are not described, these data may not be recorded on the same recording medium, and may be recorded on different media. In particular, various encryption key data may be encrypted with another key, accessible through a special authentication process, or stored in a special area of the information recording medium.

  The intermediate key data 121 is for encrypting the partial document data (the extracted document data) extracted by the document data extraction unit 114, or for decrypting the encrypted extracted document data. Used to calculate the key. A specific calculation method and usage procedure of the intermediate key data will be described later.

  As for the encrypted cut data 122, the user selects part of the document data displayed on the output unit 140 via the input unit 130, and the document data cut out unit 114 identifies, specifies, and copies the selected data. The selected and copied data is encrypted data.

  The original data encryption key 123 is a key value used for encrypting document data.

  The encryption source data 124 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. Examples of the content data include newspapers, magazines, and manga.

  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 document data displayed on the left screen 201 using, for example, a pen-shaped input unit 130. 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 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 cuts out and copies 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 extraction unit 114 of the control unit 110 determines which part of the document data is selected, and copies the determined document data to a buffer memory or the like managed internally (hereinafter referred to as a user). (The partial data of the document data selected in the above is called cut document data). 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 uniquely assigned to the document data (an ID number and a page uniquely assigned by the data distribution vendor) A combination of numbers) or information uniquely calculated from the document data, more specifically, the document data displayed on the output unit 140 is input as binary data to a one-way calculation process, It is a value calculated by a so-called hash operation for obtaining long data.

  (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 stores the encrypted cutout document data as encrypted cutout data 122 and the intermediate key data 121 derived in the middle of calculating the encryption key at step S303. Records in the 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 intermediate key data 121 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 exclusive OR (XOR operation) processing of the intermediate key data 121 calculated in step S401 and the unique information acquired in step S402.

  (Step S404) The key calculation unit 113 corresponds to a key for encrypting cut-out document data as the calculation result of step S403.

  Next, processing when browsing the cut document data information with the document data editing apparatus 100 will be described.

  FIG. 5 is a diagram illustrating an operation example of the document data editing apparatus 100 when browsing cut-out document data information.

  FIG. 5A 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. 5B 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. 5 will be described with reference to FIG.

  (Step S601) 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 S <b> 602) Next, the control unit 110 reads the encrypted cut data 122 and the intermediate key data 121 stored in the information recording unit 120.

  (Step S603) 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 S604) 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 S605.

  (Step S605) 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 intermediate key data 121 read from the information recording unit 120. The method for calculating the decryption key is the same as the method for calculating the encryption key described above, except that the read intermediate key data 121 is used instead of generating a random value, and the description here is omitted.

  (Step S606) Next, the encryption / decryption unit 112 of the control unit 110 decrypts the encrypted cut-out data read from the information recording unit 120 with the decryption key calculated by the key calculation unit 113, and normalizes the data.

  (Step S607) Next, the encryption / decryption unit 112 of the control unit 110 determines whether or not the encrypted cut-out data 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 the decryption is successful, the process proceeds to step S608.

  (Step S608) Next, the control unit 110 displays the decrypted data on the output unit 140.

  As described above, the document data editing apparatus 100 extracts part of the document data selected by the user from the document data, and encrypts the extracted document data with the intermediate key data 121 and the calculation result of the unique information. When the unique information cannot be calculated, a configuration in which the cut-out data cannot be decrypted is realized. This makes it possible for the user to cut out part of the document data like a scrap, but the extracted document data cannot be decrypted without the original data, and the document data is illegal. It becomes possible to prevent duplication.

  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.

  In the above description, the intermediate key data 121 shows a method of generating a random value and using the value, but the same value as the original data encryption key is used, or a predetermined operation is performed based on the value of the original data encryption key. It may be a method of calculating according to the processing.

(Embodiment 2)
In this embodiment, since there are many configurations similar to those in Embodiment 1, only different points will be described. FIG. 7 is a diagram showing a configuration of the document data editing apparatus 100 according to the present embodiment. The difference from the first embodiment is that the intermediate key data 121 is not included. Since other configurations are the same, a detailed description is omitted.

  The processing sequence of cut document data in the document data editing apparatus 100 is different only in that the intermediate key data 121 is not stored in the information recording unit 120 in step S305 of FIG. 3 shown in the first embodiment. Since this is the same, the explanation here is omitted.

  Next, a processing sequence of the key calculation unit 113 of the document data editing apparatus 100 according to the present embodiment will be described with reference to FIG.

  (Step S 801) The key calculation unit 113 of the control unit 110 of the document data editing apparatus 100 acquires the original data encryption key 123 recorded in the information recording unit 120. When the original data encryption key 123 is encrypted and recorded in the information recording unit 120, the original data encryption key 123 is decrypted and obtained as plain text 128-bit key data.

  (Step S802) The key calculation unit 113 calculates unique information. The specific method is the same as that in step S402 shown in FIG.

  (Step S803) Next, the key calculation unit 113 performs an exclusive logical (XOR operation) process of the original data encryption key acquired in step S801 and the unique information acquired in step S802.

  (Step S804) Next, the key calculation unit 113 obtains an encryption key for encrypting the clipped document as the calculation result of step S803.

  The processing sequence when the control unit 110 of the document data editing apparatus 100 displays cut document data on the output unit 140 will be described with reference to FIG. Since other parts are the same as those in FIG. 6, the description thereof is omitted here.

  (Step S <b> 902) The control unit 110 reads out the encrypted cutout data stored in the information recording unit 120.

  (Step S905) 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 original data encryption key read from the information recording unit 120.

  As described above, the document data editing apparatus 100 extracts part of the data selected by the user from the document data, and encrypts the extracted data with the calculation result of the original data encryption key and the specific information. When it cannot be calculated, a configuration in which the cut-out data cannot be decoded is realized. In this case, the key data stored in the information recording unit 120 does not increase. As a result, a part of the document data can be cut out like a scrap for the user. On the other hand, since the cut out document data cannot be decrypted without the original data, the document data is illegal. It becomes possible to prevent duplication.

  Although the configuration of the document data editing apparatus has been described in the present embodiment, the present invention is not limited to the above-described embodiment. Various modifications can be made without departing from the spirit of the present invention. For example, the present invention includes the following cases.

  (1) In the above embodiment, the calculation result of the unique information calculated by the unique information calculation unit 111 and the original data encryption key recorded in the information recording unit 120 is used as the encryption key calculation method for encrypting the cut-out data. Although an example in which is used is shown, a method of encrypting using only unique information without using information of the original data encryption key may be used.

  Further, for example, the following cases common to the first and second embodiments are also included in the present invention.

  (1) In the above embodiment, as unique information calculated by the unique information calculation unit 111, an ID value uniquely assigned to document data, or a hash calculation value of document data as information uniquely calculated from document data As a value used for the hash calculation, it is calculated from the document title (a value that can be uniquely specified) and its page number, which determine the documents before and after the cut document data and use a predetermined character string length. Any value may be used as long as it is unique data regarding the document to be extracted, such as data.

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

  (3) In the above 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.

  (4) In the above embodiment, the key for encrypting the cut-out data is calculated by the 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.

  (5) Although the document data has been described as an example in the above embodiment, the present embodiment is not limited to this. In addition to document data, image data, video data, music data, and the like may be used. In that case, it is possible to cope with the same as in the case of the document data by using an input method, an output method, or the like according to the type of the data.

  In the document data editing apparatus and the document data editing method according to the present invention, a part of the document data selected by the user is encrypted and held with a value using the unique information of the original document data, so that an illegal document is obtained. Copying can be prevented. 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 Intermediate key data 122 Encrypted extraction data 123 Original data encryption key 124 Encrypted original data 130 Input unit 140 Output unit 201 Screen on left side of document data editing device 202 Screen on right side of document data editing device

Claims (8)

The original data that encrypted the document data,
An original data encryption key used when encrypting the document data;
Encrypted cutout data obtained by encrypting cutout document data that is part of the document data; and
Intermediate data required to calculate an encryption key required when generating the encrypted cut-out data, and the encryption key is calculated by calculation with unique information calculated from the document When,
An information storage medium for storing. The original data that encrypted the document data,
An original data encryption key used when encrypting the document data;
Encrypted clipped data obtained by encrypting the clipped document data that is a part of the document data with an encryption key calculated by calculating the original data encryption key and the unique information calculated from the document;
An information storage medium for storing. A document data editing device for editing document data,
An input unit for accepting a range for designating a cutout portion of the document data from a user;
A unique information calculation unit for calculating unique information unique to the document data;
A key calculation unit that generates a key for encrypting the clipped document data specified by the input unit from the intermediate key that is intermediate data for generating an encryption key and the unique information;
An encryption part for encrypting the extracted document data with the key generated by the key calculation part;
Document data editing apparatus comprising: The key calculation unit uses an original data encryption key, which is an encryption key for encrypting the document, as the intermediate key.
The document data editing apparatus according to claim 3. The key calculation unit uses the unique information as a key for encrypting the cut out document data.
The document data editing apparatus according to claim 3. An output unit for displaying and outputting the document;
The input unit specifies a range for designating a cutout portion of the document by designating a range on the output unit;
The document data editing apparatus according to claim 3. The unique information calculation unit calculates an identifier of the device as the unique information.
The document data editing apparatus according to claim 3. A document data editing method for editing document data,
An input step of accepting a range for designating a cutout portion of the document data from the user;
A unique information calculating step for calculating unique information unique to the document data;
A key calculation step of generating a key for encrypting the cut document data designated by the input unit from the intermediate key, which is intermediate data for generating an encryption key, and the unique information;
A ciphering step of encrypting the extracted document data with the key generated by the key calculating step;
Document data editing method comprising: