JPWO2004109521A1 - Copy prevention program, computer-readable recording medium on which the program is recorded, and copy prevention system - Google Patents

Abstract

An object of the present invention is to provide a duplication prevention program capable of preventing unauthorized copying of data files. Encrypted data recording means for recording encrypted data, authentic identification information recording means for recording authentic identification information, identification information of a recording medium on which the encrypted data is recorded, and recording on the authentic identification information recording means Determining means for determining whether or not the identified identification information matches, and decryption means for decrypting the encrypted data when the two identifying information matches by the determining means; The computer functions as display means for displaying the displayed data on the display section and execution restriction means for restricting execution of functions such as editing, copying, printing, and saving for the data displayed on the display section.

Description

  The invention of the present application is not only capable of displaying a data file recorded on a regular recording medium when copied to another recording medium, but also functions such as printing or saving the data file recorded on the regular recording medium. The present invention relates to a copy prevention program for restricting the copy, a recording medium on which the copy prevention program is recorded, and a copy prevention system for causing a computer to execute the copy prevention program.

  Conventionally, various data files such as document data, image data, list data, etc. are stored in a recording medium, and the recording medium is displayed on a display or printed by a printer using a computer application program or the like. Or storing it on another recording medium. Therefore, various data files can be illegally printed or illegally recorded on other recording media. In order to prevent unauthorized use of data recorded on recording media in this way, by setting a password in the data file, only those who know the password can view, print, save, copy, edit, etc. To prevent unauthorized use of data by preventing those who do not know the password from doing so.

In addition, there is an illegal copy prevention application program that cannot read or execute an application program when an illegal copy is made from a CD-ROM in which an application program such as a game is recorded to another recording medium such as a CD-R. The copy prevention application program records the medium type of a regular recording medium in advance, and when the application program such as a game used by the user is executed, the application program is recorded prior to the execution. Check whether the medium type of the medium matches the medium type of the regular recording medium. If the medium type is not the regular recording medium type, the application program is not executed and the application program is copied. Is substantially prevented (for example, refer to Patent Document 1).
International Publication WO 02/082280

  However, if the data is protected by a password, the data provider needs to provide both the data file and the password data to the user of the data. When both the password and the corresponding password are copied, the data file can be easily used by a third party, and a large number of illegal files can be copied. For authorized users, not only is it necessary to enter the password every time the data file is used, but if the authorized user forgets the password, the data file can be viewed. I couldn't even do it.

  In the latter case, when the data recorded on the recording medium is not an application program such as a game but a data file such as a document data file or an image data file, the application program corresponding to the data file is executed (started). It is displayed on the display etc. Therefore, part or all of the data can be copied to another recording medium such as a hard disk (HDD) or flexible disk (FD) by using functions such as storage and copying originally provided in the application program. It is. Similarly, it has been possible to print a large amount on a paper medium or the like using a printing function.

  The present invention has been made in view of such a problem. For a legitimate user, a complicated operation such as inputting a password is not required, and it is possible to prevent unauthorized copying of a data file. An object of the present invention is to provide an anti-duplication program and a recording medium on which the anti-duplication program is recorded, and an anti-duplication system that executes the anti-duplication program.

  To achieve the above object, the duplication prevention program of the present invention records encrypted data recording means for recording encrypted data obtained by encrypting the data file, and authentic identification information included in the regular recording medium. Authentic identification information recording means, determination means for determining whether or not the identification information of the recording medium in which the encrypted data is recorded and the identification information recorded in the authentic identification information recording means match; If the two identification information matches by the judging means, the decrypting means for decrypting the encrypted data recorded in the encrypted data recording means, and the data decrypted by the decrypting means are displayed on the display unit. A display means for displaying on the display unit, and an execution restriction for restricting execution of at least a saving or copying function among editing, printing, saving and copying for the data displayed on the display unit Characterized in that to function the computer as a stage.

  Further, encrypted data recording means for recording encrypted data obtained by encrypting the data file, authentic identification information recording means for recording authentic identification information included in the regular recording medium, and the encrypted data are recorded. A discriminating means for judging whether or not the identification information of the recording medium and the identification information recorded in the authentic identification information recording means match, and when the two discriminating information match by the judging means, Decryption means for decrypting the encrypted data recorded in the encrypted data recording means, display means for displaying the data decrypted by the decryption means on a display section, and display on the display section An anti-duplication system comprising an execution restriction means for restricting execution of at least saving or copying among editing, saving, copying and printing of data. It may be.

  Therefore, only when a data file is recorded on a regular recording medium, the data can be displayed on a display unit such as a display. When the data file is copied to another recording medium, the data is displayed. Therefore, only a user who uses a regular recording medium can view the data. In addition, functions such as editing, printing, saving, and copying of the displayed data are limited, so that the data can be browsed, but they can be saved on other recording media and copied to other files ( Copying and pasting) is restricted, and data contents cannot be easily duplicated.

  Further, the display means may have a function of starting an application program installed in advance in a computer in accordance with the data format of the data file and displaying the decrypted data on a display unit. Good.

  In addition, the execution restriction unit monitors a process executed by one or both of the operating system preinstalled in the computer and / or the application program, and detects the process restricted in advance. A function for forcibly interrupting the processing of the process may be provided so that only the contents of the data can be browsed.

  The execution restricting means monitors an event detected by one or both of the operating system preinstalled in the computer and / or the application program, and processes the event when a pre-restricted event is detected. May be provided so that only the content of the data can be browsed.

  Further, the display means includes an application program for displaying the decrypted data, and the computer has a function of starting the application program and displaying the decrypted data on a display unit. Even if an application program for displaying data is not installed, it may be possible to browse only the contents of the data.

  Further, the authentic identification information includes at least the type information of the recording medium, and the determination unit records the type information of the normal recording medium stored in the authentic identification information storage unit and the encrypted data. A function of determining whether or not the type information of the recording medium matches may be provided.

  Further, the anti-duplication program may be recorded on a computer-readable recording medium, and the recording medium may be provided to the user.

The anti-duplication program, the computer-readable recording medium on which the anti-duplication program is recorded, and the anti-duplication system of the present invention are based on the identification information provided on the recording medium. Since the data of the data file is displayed by determining whether or not it is a recording medium, the contents of the data cannot be displayed on the display unit even if it is illegally copied. That is, unauthorized use due to duplication of data files can be prevented.
In addition, even if a legitimate user displays the data on the recording medium, functions such as copying and saving are limited. Therefore, part or all of the data contents can be copied or stored on another recording medium. Cannot be duplicated. Moreover, since printing of the displayed data is also restricted, it is possible to prevent the printed data from leaking.
In addition, data file users can browse data without knowing the data necessary to remove protection such as passwords, and do not need to perform the complicated task of entering a password. In addition, the inconvenience of forgetting the password and not being able to view the data can be eliminated.

  Further, since the display means starts an application program installed in the computer in advance and displays the data content of the data file on the display unit, there is no need to record the application program for browsing the data file on the recording medium, A large number of anti-duplication programs can be recorded on one recording medium.

  In addition, if the execution restriction means monitors processes detected by the operating system or application program and events detected by the operating system or application program, and detects processes or events such as copying, printing, saving, editing, etc., Is forcibly interrupted, so that duplication of data recorded on a regular recording medium can be prevented.

  Further, since the display means includes an application program for displaying the decrypted data, the data can be displayed without inconvenience even for a user who has not installed the application in the computer. Furthermore, a unique application can be provided, and this unique application can restrict execution of copying, printing, saving, editing, and the like.

  In addition, since the recording medium type information is included as the recording medium identification information, data cannot be displayed even if it is copied to another type of medium. For example, when the regular recording medium is a CD-ROM, not only can a large number of recording media on which a copy prevention program is recorded be created at one time, but individuals and the like can use an expensive apparatus for creating a CD-ROM. Not equipped and can easily prevent duplication at the individual level.

FIG. 1 is a block diagram illustrating an outline of a copy prevention program and a recording medium on which the copy prevention program is recorded.
FIG. 2 is a block diagram showing an outline of creation of a copy prevention program.
FIG. 3 is an explanatory diagram of an execution restriction unit that monitors processes and events and restricts execution of copying, saving, printing, editing, and the like.
[FIG. 4] (a) is an explanatory diagram when a copy prevention program recorded on a regular recording medium is executed by a computer, and (b) is a diagram showing a copy prevention program copied to another recording medium. It is explanatory drawing when it performs by.
FIG. 5 is a flowchart when the anti-duplication program is executed by a computer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording medium 2 Duplication prevention program 3 Identification information 4 Encrypted data storage means 5 Genuine identification information recording means 6 Judgment means 7 Decoding means 8 Display means 9 Execution restriction means 10 Display part 11 Data file 12 Duplication prevention program creation system 13 Encryption 14 means for creating anti-duplication program 15 means for operating system 16 application program 17 means for inputting authentic identification information C computer

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing an outline of a copy prevention program and a computer-readable recording medium on which the anti-duplication program is recorded. The recording medium 1 records a duplication prevention program 2 and the recording medium 1. Is provided with identification information 3 for identifying. As the recording medium 1, various recording media such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RAM, DVD-RW, DVD + RW, MO, MD, HDD, and FD are available. Though conceivable, the present invention is not limited to these, and other recording media may be used.

  As shown in FIG. 1, the anti-duplication program 2 causes the computer to function as encrypted data storage means 4, authentic identification information recording means 5, judgment means 6, decryption means 7, display means 8, and execution restriction means 9. This is a program, and the recording medium 1 on which the computer and the anti-duplication program 2 are recorded and the anti-duplication program 2 cooperate to prevent duplication of the data file.

  As shown in FIG. 2, the encrypted data storage means 4 encrypts the data file 11 by the encryption means 13 included in the computer (duplication prevention program creation system 12). Is a means for storing. The authentic identification information recording means 5 is means for recording authentic identification information provided in the normal (authentic) recording medium 1 input by an authentic identification information input means 17 (see FIG. 2) described later. The determination means 6 determines whether or not the identification information 3 of the recording medium 1 in which the encrypted data is recorded and the authentic identification information recorded in the authentic identification information recording means 5 match. The identification information 3 provided in the recording medium 1 in which the anti-duplication program 2 is recorded is read, and the identification information 3 is compared with the genuine identification information to record the anti-duplication program 2 1 is a means for determining whether or not the recording medium is a regular recording medium. If the two pieces of identification information do not match, the determination means 6 interrupts the subsequent processing (stops reading data). The decryption unit 7 is a unit that decrypts the encrypted data recorded in the encrypted data recording unit 4 when the determination unit 6 determines that the two pieces of identification information match. The display unit 8 activates an application program (hereinafter referred to as an application) 16 installed in advance in the computer in accordance with the data format (data type) of the data decrypted by the decryption unit 7. This is means for displaying the data of the decrypted data file on the display unit 10 such as a display. As shown in FIG. 3, the execution limiting means 9 is executed by an operating system 15 (hereinafter referred to as an OS) installed in the computer C or an application 16 installed in the computer C in advance. The processes that are set in advance to restrict functions such as copying (copying and pasting), printing, editing (input, deleting, changing) and saving of data displayed on the display unit 10 are monitored. When detected, this means forcibly interrupts the detected process. In addition to the processes executed by the OS 15 and the application 16, the execution restriction unit 9 monitors an event (event signal) with respect to an input signal from an input unit such as a keyboard or a mouse detected by these, and can copy, print, When an event (event signal) corresponding to a function such as editing or saving is detected, the processing corresponding to the event (event signal) is forcibly interrupted.

  The data file 11 in the present invention is, for example, document data created by a word processor application. In addition, image data, table data, spreadsheet format (CSV format) data, HTML data, or these However, the present invention is not limited to these, and data that can display the contents of the data using an application installed in a computer is shown.

  Further, if the display means 8 is provided with an application 16 (see FIG. 3) capable of displaying the decrypted data by a computer, the application 16 is activated to display the decrypted data. It can also be displayed on the part 10. That is, if the application 16 is recorded on the recording medium 1 (display unit 8), the decrypted data can be displayed only by starting the application 16. In such a case, there is no need to install the application 16 in advance in the computer, and data can be displayed even when the application 16 is not installed in the computer. Furthermore, a unique application 16 can be provided, and these unique applications may be limited as applications that do not have functions such as copying, printing, saving, and editing.

  Conversely, when the display means 8 starts an application program installed in advance in the computer and displays the decrypted data on the display unit 10, the application program is recorded on a recording medium. Since there is no need, it is possible to record a large number of data file copy prevention programs on a single recording medium.

  The identification information 3 included in the recording medium 1 is information for identifying the recording medium 1 and indicates data that can be read by a computer or information that can be recognized by a computer. Illustratively, type information indicating the type of a recording medium such as CD, DVD, HDD, etc., information on the manufacturer and product name of the recording medium, unique information set for each recording medium, etc. Is mentioned. Also, information such as information that cannot be easily copied to other recording media is shown. More specifically, when the recording medium is a CD-R, since it has ATIP (Absolute Time In Pregroove), the presence / absence of the ATIP and its detailed information become one of the identification information. Further, when the recording medium is a DVD-ROM, since the BCA (Burst Cutting Area) is provided, the presence / absence of the BCA and its detailed information are one of the identification information. Further, when the recording medium is a CD-ROM, since the ATIP is not provided, it can be one of identification information that the ATIP is not provided and the type of the recording medium is a CD. In addition, when the recording medium is a CD-R (CD-RW), the difference between whether recording is performed with disk-at-once or recording with track-at-once is one of identification information. In addition to these, the recordable amount (recording area) of the storage medium and the length of the audio data when the CD-DA format audio data and the copy prevention program 2 are recorded on the same CD. Information based on (capacity) and the audio data can be used as identification information. In addition, it is possible to perform a defective area process that the computer determines as a defective area on the storage medium, and use the presence or absence of the defective area as part of the identification information. Information other than that described above can be used as identification information. In the present invention, one of these pieces of information or a combination thereof is used as identification information.

  Next, a case where the duplication prevention program recorded on the regular recording medium 1 is executed on a computer will be described.

  As shown in FIG. 4A, the anti-duplication program 2 is recorded on a CD-ROM 1a which is a regular recording medium. The regular CD-ROM 1a is provided with information that the medium type is “CD-ROM” as identification information. In other words, it has information that the type of the recording medium is “CD” and does not have ATIP. When this anti-duplication program 2 is executed by a computer, as shown in FIG. 1, FIG. 4 (a) and FIG. 5, the determination means 6 reads the identification information 3 provided in the CD-ROM 1a which is a recording medium ( S1). Further, the determination means 6 acquires the authentic identification information recorded in the authentic identification information recording means 5 (S2), compares the identification information 3 with the authentic identification information, and determines whether or not they are the same. Is determined (S3).

  If the two pieces of identification information are the same, the encrypted data stored in the encrypted data storage means 4 is read and decrypted (S4). When the encrypted data is decrypted, the display means 8 determines the type of the decrypted data, starts an application corresponding to the data (S6), and stores the decrypted data file. The data contents are displayed on the display unit 10 (S7).

  The application corresponding to the data in the decrypted data file is an application in which the decrypted data (data file 11 (see FIG. 2)) is created or an application that can display the decrypted data. Indicates. For example, when the decrypted data (data file 11) is image data, it is an application that can display the image data, and when it is document data, it is an application that can display the document data.

  When the decrypted data is displayed on the display unit 10, as shown in FIG. 3, the execution restriction unit 9 performs the process executed by the application 16 or the OS 15, the event generated or detected by the application 16 or the OS 15. (Event signal) is monitored (S8). Then, it is determined whether or not the process (event) detected by the execution restriction unit 9 matches a process (event) for which execution, which has been set in advance, such as editing, copying, printing, and saving, is restricted (S9). ). When the process restricted by the execution restriction unit 9 matches the process (event) being monitored, the process corresponding to the process is forcibly interrupted (for example, the process of “save” is performed). (S10). On the other hand, if the two processes (events) do not match, processing corresponding to the monitored process is executed (for example, “screen scroll” processing is executed) (S11).

  When the execution restriction unit 9 monitors a process or event, information such as a process ID is used to distinguish the application 16 (see FIG. 3) activated by the display unit 8 from other activated applications. In the case of distinguishing based on the process, an option is set in the start command of the application 16, and when the start command is executed, data such as a process ID is notified to the display means 8, and the notified process The ID may be stored, and the process or event of the corresponding application 16 may be monitored.

  Further, the display means 8 displays the application 16 so that icons and menus (menu bar) for performing printing (printing), copying (copying / pasting), saving, editing (deleting, adding, etc.) are hidden. You may start by controlling. In this way, not only can a specific function not be executed, but the screen of the application can be changed so that the user can see from the screen that these operations cannot be performed.

  Next, a case where the copy prevention program 2 recorded on the regular CD-ROM 1a is copied to the CD-R 1b of another recording medium will be described.

  As shown in FIG. 4B, the illegally copied CD-R 1b is provided with information that the medium type is “CD-R” as identification information. That is, the information includes that the type of the recording medium is “CD” and has ATIP. When this anti-duplication program 2 is executed by a computer, as shown in FIG. 1, FIG. 4 (b) and FIG. 5, the determination means 6 reads the identification information 3 provided in the CD-R 1b which is a recording medium ( S1). Further, the determination means 6 acquires the authentic identification information recorded in the authentic identification information recording means 5 (S2), compares the identification information 3 with the authentic identification information, and determines whether or not they are the same. Is determined (S3). Since the genuine identification information and the identification information of the recording medium 1b are not the same, the computer displays a dialog with an error message, for example, “It has not been started from a legitimate medium” (S5), and pay attention to the user. Prompt.

  As shown in the above-described embodiment, the data of the data file can be displayed on the display unit from a regular recording medium, but the functions such as copying, saving, printing, and editing cannot be executed. Therefore, part or all of the displayed data cannot be stored or copied (replicated) to another recording medium. In addition, users of data files can view data without knowing data such as passwords, and not only do they have to do the troublesome task of entering passwords, but also forget passwords and view data. The inconvenience of becoming impossible can also be eliminated.

  On the other hand, even if an anti-duplication program including a data file is illegally recorded from a regular recording medium to another recording medium, the data in the data file cannot be displayed, and the anti-duplication program itself is copied. Even if it is possible, the data file cannot be used for displaying data, so that illegal use of the data file can be prevented. Further, since the data file provided in the anti-duplication program is encrypted, the data file cannot be displayed even if the anti-duplication program is temporarily copied.

  In other words, the anti-duplication program not only prevents the data file data from being viewed unless it is recorded on a legitimate recording medium, but also copies, saves, prints, and edits the displayed data. Etc. can not be. For example, when it is used for directory data distributed to members such as organizations and organizations, only members who have been distributed a regular recording medium can view the data, but it can also be used even if the data is copied illegally In addition to being able to do this, it is not possible to copy data (copy / paste) and record it as another data file because the functions are limited to data browsing only from regular recording media. Since the data is not printed and the data is not leaked, it is an optimum protection technique when information is disclosed only to a specific person.

  The copy prevention program 2 can be recorded on a computer-readable recording medium, and the recording medium can be distributed so that the data file cannot be used from other than a regular recording medium.

  In particular, in order to record data on a recording medium such as a CD-ROM or DVD-ROM, an expensive device (equipment) is required, and it is actually impossible for an individual to record data on the recording medium. Therefore, if the regular recording medium is a CD-ROM or DVD-ROM, data duplication at an individual level can be easily prevented.

  Further, the copy prevention program is executed by a computer, and is provided with the encryption recording means 4, the authentic identification information recording means 5, the judgment means 6, the decryption means 7, the display means 8, and an execution restriction means 9. As a prevention system, duplication of data files can be prevented.

  In addition, as shown in FIG. 2, the anti-duplication program creation system 12 includes an encryption unit 13, an authentic identification information input unit 17, and an anti-duplication program creation unit 14 in a computer, and is an unencrypted data file. 11 is a system for creating the copy prevention program 2 by encrypting 11. The encryption unit 13 is a unit for encrypting the data file 11, and may be any one corresponding to the decryption method performed by the decryption unit 7, and the encryption method is not particularly limited. The authentic identification information input means 17 is means for inputting the identification information 3 (see FIG. 1) provided in the regular recording medium 1 (1a) for recording the anti-duplication program. The authentic identification information input means 17 can be inputted by a person operating the computer to input the identification information or selecting the corresponding identification information, but the identification information reading means (illustrated) provided in the computer. However, the computer can automatically read the identification information provided in the regular recording medium 1, and the computer can automatically input the identification information to the authentic identification information input means 17. The anti-duplication program creation unit 14 is configured to execute the encryption shown in FIG. 1 based on the encrypted data encrypted by the encryption unit 13 and the authentic identification information input by the authentic identification information input unit 17. The duplication prevention program 2 is created for causing the computer to function as the data recording means 4, the authentic identification information recording means 5, the judgment means 6, the decryption means 7, the display means 8, and the execution restriction means 9. The anti-duplication program 2 created by the anti-duplication program creation system 12 is recorded on a regular recording medium by a recording method suitable for the recording medium. For example, when the recording medium is a CD-ROM, a DVD-ROM, or the like, a computer-readable recording medium on which the copy prevention program is recorded by a supplier who records the copy prevention program on the recording medium. Is made. In addition, when a general user such as a CD-R or DVD-R can easily record a recording medium, a computer on which the anti-duplication program is recorded by recording the anti-duplication program on the recording medium using an existing system. A readable recording medium is manufactured.

Claims (8)

A data file copy prevention program recorded on a recording medium,
Encrypted data recording means for recording encrypted data obtained by encrypting the data file, authentic identification information recording means for recording authentic identification information included in the regular recording medium, and the encrypted data are recorded When the identification information of the recording medium and the identification information recorded in the authentic identification information recording means match, and when the two identification information matches by the determination means, Decryption means for decrypting the encrypted data recorded in the encrypted data recording means, display means for displaying the data decrypted by the decryption means on the display section, and for the data displayed on the display section Copy prevention program for causing a computer to function as an execution restriction means for restricting execution of at least a copy or save function among editing, copying, printing, and saving 2. The copy according to claim 1, wherein the display unit has a function of starting an application program preinstalled in a computer in accordance with a data format of the data file and displaying the decrypted data on a display unit. Prevention program. The execution restricting means monitors a process executed by one or both of an operating system preinstalled in a computer and / or the application program, and detects a process restricting execution in advance. The copy prevention program according to claim 2, further comprising a function for forcibly interrupting the process. The execution restricting means monitors an event detected by one or both of an operating system preinstalled in a computer and / or the application program, and forcibly processes the event when a pre-restricted event is detected. An anti-duplication program according to claim 2, further comprising a function for interrupting automatically. 2. The display unit includes an application program that displays the decrypted data, and a function of causing a computer to start the application program and display the decrypted data on a display unit. Anti-duplication program. The authentic identification information includes at least the type information of the recording medium, and the determination unit is a recording medium in which the type information of the normal recording medium stored in the authentic identification information storage unit and the encrypted data are recorded. The anti-duplication program according to claim 1, further comprising a function of determining whether or not the type information matches. A computer-readable recording medium on which the copy prevention program according to any one of claims 1 to 6 is recorded. A system for preventing duplication of a data file recorded on a recording medium,
Encrypted data recording means for recording encrypted data obtained by encrypting the data file, authentic identification information recording means for recording authentic identification information included in the regular recording medium, and the encrypted data are recorded When the identification information of the recording medium and the identification information recorded in the authentic identification information recording means match, and when the two identification information matches by the determination means, Decryption means for decrypting the encrypted data recorded in the encrypted data recording means, display means for displaying the data decrypted by the decryption means on the display section, and for the data displayed on the display section An anti-duplication system comprising an execution restriction means for restricting execution of at least a copy or save function among editing, copying, printing, and saving in a computer

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