JP5988554B2 - Information processing apparatus, information processing method, and program - Google Patents

Description

  The present invention relates to a technique for managing the copyright of modified content.

  In recent years, copyright protection technology has been developed with the digitization of content. In particular, various copyright protection techniques have been developed and widely used for commercial content data such as movie data and music data mainly for the purpose of preventing duplication. On the other hand, non-commercial content data handled in an office is often not only browsed but also subjected to secondary processing such as modification and editing. In such a case, as with the copyright for the original content data, a secondary copyright is also given to the modified content data and the edited content data, but they are often not strictly managed. In addition, the content data often includes a quotation from content data that is copyrighted by another copyright holder.

  Conventionally, as a method for managing the secondary copyright of the content data modified in this way, a method of creating copyright history information and managing it together with the content data is known. That is, the copyright history data from the original content data to the current content data is managed by creating the copyright information data for each modification from the creation of the original content data and associating it with the content data. In addition, the copyright of the original content data regarding the modified content data is controlled by the processing permission when the original content data is modified, and if the processing permission is granted, the copyright is handled together with the secondary copyright of the modified content data. There was also. Patent Document 1 discloses a technique for determining whether or not citation is appropriate based on the availability information of content data to which other copyright holders have copyright and the data amount of the content data.

JP 2004-118324 A

  However, in the above-described prior art, when a plurality of changes are made by a plurality of copyright holders, the content data changed for each copyright holder cannot be managed. In particular, when the original content data includes a citation, even if it is confirmed that the citation is appropriate for the copyright in the original content data, it is strictly determined whether the citation is appropriate in the modified content data after that. Could not manage.

  Accordingly, an object of the present invention is to strictly manage whether or not modification is appropriate even in modified content data.

An information processing apparatus according to the present invention includes an input unit for inputting author information, and decrypts content encrypted with a first encryption key corresponding to the author information with a decryption key corresponding to the first encryption key. Display control means for displaying as display content, addition means for adding additional content to the display content, calculation means for calculating a change amount of the content due to addition of the additional content to the display content, and the calculation means in accordance with the calculated amount of change, and changing means for changing the additional content, the second cipher key according to the author information input by said input means as the author information corresponding to the previous SL additional content there are, in the above first encryption key different from the second encryption key, encryption to encrypt the additional content that has been changed by said changing means catheter If, have a, an imaging unit for imaging the display screen of the content, the encryption unit does not exist in the display within the first captured image obtained by the first imaging relative to the screen by the imaging unit, wherein The additional content present in the second captured image obtained by the second imaging with respect to the display screen by the imaging unit is determined according to the author information input by the input unit in accordance with the second imaging. Encryption is performed using the second encryption key .

  According to the present invention, it is possible to strictly manage whether or not modification is appropriate even in modified data.

It is a figure which shows the structure of the modified content secondary copyright management apparatus which concerns on embodiment of this invention. It is a figure which shows an example of transition of content data when the modifiers B and C modify the original content data created by the original author A. It is a figure which shows the original content data part which the original author A produced, and the modification part of each of the modifiers B and C. It is a figure which shows the structure of a display and modification part. It is a flowchart which shows the modification process of content data. It is a figure which shows the data format of the content data stored on a content database. It is a figure which shows the example of the reuse method of content data. It is a figure which shows the edit content of content data. It is a flowchart which shows the edit process of content data. It is a figure which shows typically the state in which the original content data e1 and the edit content data f1 are decoded at the time of reuse.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments to which the invention is applied will be described in detail with reference to the accompanying drawings.

  In the following, an embodiment of the present invention will be described by taking modification and reuse of content data in a conference as an example. For example, consider a case in which original content data on a database is projected on a whiteboard by a projector, and the original content data projected on the whiteboard is written. On the whiteboard, modified content data is created by combining the projected original content data and the written data. Hereinafter, the content data modified in this way may be referred to as modified content data.

  Next, the modified content data is stored by capturing the modified content data projected on the whiteboard as image data with the camera. At this time, the copyright holders of the stored modified content data are the copyright holder of the original content data and the copyright holder of the additional portion. Further, when a PC (Personal Computer) is connected to the projector and a file for presentation is projected, the modified content data is also created when the file is added or changed on the PC.

  In this embodiment, the copyright of the modified content data is managed by the following procedure. First, after the original content data is modified, the modified content data is captured by photographing with the camera, and the captured modified content data is separated into portions for each copyright of each copyright holder. Then, it is sequentially encrypted with the encryption key set for each copyright and stored in the database. That is, the modified content data is multiple-encrypted with the encryption keys of a plurality of copyright holders, and when reused, only the portions permitted by the respective copyright holders are decrypted. Then, the modified content data is reused by reconstructing the content data from the portion where reuse is permitted.

  FIG. 2 is a diagram showing an example of the transition of content data when the modifiers B and C modify the original content data created by the original author A. First, the modifier B adds Text1 to the original content data (2001 in FIG. 2) in which FIG. 1 of the original author A and the cited data 1 are arranged (2002 in FIG. 2). Next, the modifier C adds FIG. 2 (2003 in FIG. 2), and again, the modifier B adds Text2 and citation data 2 (2004 in FIG. 2). Next, since it is determined that the citation data 2 is not appropriate, the modifier B deletes the citation data 2 (2005 in FIG. 2). At this time, the original content data portion created by the original author A and the modified portions of the modifiers B and C are as shown in FIG. That is, 301 in FIG. 3 shows the original content data portion created by the original author A, 302 in FIG. 3 shows the modified portion of the modifier B, and 303 in FIG. The modified part is shown.

  FIG. 1 is a diagram showing a configuration of a modified content secondary copyright management apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 100 denotes a modified content secondary copyright management apparatus that manages copyrights at the time of registration, reuse, modification, and editing of content data. Reference numeral 101 denotes a content use permission determination unit that determines whether or not content data can be used. A content database 102 stores content data to be reused. Reference numeral 103 denotes a content decryption processing / reconstruction processing unit that decrypts and reconstructs the encrypted content data output from the content use permission determination unit 101. Reference numeral 104 denotes an encryption key database for storing the encryption key of the copyright holder of the content data used when encrypting and decrypting the content data. A modification / edit content separation processing unit 105 separates content data for each copyright. Reference numeral 106 denotes a modification / editing amount calculation processing unit that calculates the modification amount or editing amount of the content data separated for each copyright by the modification / editing content separation processing unit 105. 107 is a modification / editing / quotation appropriateness determination that determines whether modification, editing, or citation of content data is appropriate based on the modification amount or editing amount calculated by the modification / editing amount calculation processing unit 106 Part. An encryption processing unit 108 encrypts content data separated for each copyright for each copyright. A display / modification unit 110 displays the reconstructed content data output from the content decryption processing / reconstruction processing unit 103 and adds a modification. Note that the modified content secondary copyright management apparatus shown in FIG. 1 is configured as an application example of an information processing apparatus.

  FIG. 4 is a diagram illustrating a configuration of the display / modification unit 110. As shown in FIG. 4, the display / modification unit 110 includes a projector 111, a camera 112, and a copyright holder setting unit 113. The projector 111 projects content data on the whiteboard 114. The camera 112 captures content data projected on the whiteboard 114. The copyright holder setting unit 113 sets the copyright holder of the content data.

  Next, content data modification processing will be described with reference to the flowchart of FIG.

As shown in 2001 of FIG. 2, FIG. 1 and citation data 1 are arranged in the original content data a1 created by the original author A, and it is confirmed that the citation data 1 is proper in terms of copyright. Shall. The original content data a <b> 1 is encrypted with the encryption key KeyA set in advance by the original author A and stored in the content database 102. The encryption key KeyA is stored in the encryption key database 104. Here, the encryption process E for encrypting the original content data a1 with the encryption key KeyA and obtaining the encrypted content data Ca1 is expressed as follows.
Ca1 = E (KeyA, a1)

  In step S501, the display / modification unit 110 outputs the content use permission application 201 for the original content data a1 to the content use permission determination unit 101. In the content database 102, the content data Ca1 is stored in the data format shown in FIG. 6 together with the citation data and content data other than the citation data, as well as the key ID, usage permission information, and citation data information.

The content use permission determination unit 101 acquires the encrypted content data Ca1 and the use permission information 203 of the original author A of the original content data a1 from the content database 102. In step S502, the content use permission determination unit 101 determines whether the original content data a1 can be used. If the use of the original content data a1 is not permitted, the process ends here. On the other hand, if the use of the original content data a1 is permitted, the process proceeds to step S503. In step S <b> 503, the content use permission determination unit 101 outputs the content data Ca <b> 1 (205) having the data format illustrated in FIG. 6 to the content decryption processing / reconstruction processing unit 103. The content decryption processing / reconstruction processing unit 103 acquires the encryption key KeyA 207 from the encryption key database 104, and decrypts the encrypted content data Ca1. Here, the decryption process D for decrypting the encrypted content data Ca1 with the encryption key KeyA and obtaining the original content data a1 is expressed as follows.
a1 = D (KeyA, Ca1)

  The content decryption processing / reconstruction processing unit 103 outputs the original content data a1 (208) to the display / modification unit 110. Thus, the original content data a1 is projected onto the whiteboard 114 by the projector 111.

  In step S504, as shown by 2002 in FIG. 2, Text 1 is added to the original content data a1 by the modifier B. Then, the modified content data 209 is captured by the camera 112 and output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Further, the copyright holder information 210 of the modified part is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. In step S505, the modification / edit content separation processing unit 105 separates the modified content data 209 input from the display / modification unit 110 for each copyright, and the separated modified content data 211 is modified / edited amount calculation processing unit. It outputs to 106.

  In step S506, the modification amount / edit amount calculation processing unit 106 calculates the modification amount of the modified content data from the modified content data separated for each copyright. Then, the modification amount / edit amount calculation processing unit 106 outputs the calculated modification amount 212 of the modified content data to the modification / editing / quotation appropriateness determination unit 107 together with the modified content data and the copyright information of the modified content data. . In step S507, the modification / editing / quotation appropriateness determination unit 107 determines whether or not the modification is appropriate in the modified content data, and outputs the determination result as appropriateness determination result data 213. The criterion for determining whether or not the modification is appropriate is set in advance. For example, whether or not the modification amount is equal to or less than the set value is the criterion. The appropriateness determination result data 213 is output from the modification / editing / quotation appropriateness determination unit 107 to the display / modification unit 110. When appropriate determination result data 213 indicating a determination result indicating that the modification is not appropriate is output, the process proceeds to step S509. On the other hand, when the appropriateness determination result data 213 indicating the determination result that the alteration is appropriate is output, the process proceeds to step S508.

  In step S509, the modified content data is not registered in the content database 102, and the display / modification unit 110 corrects the modification according to the operation of the modifier B. Here, it is assumed that the modification by the modifier B is determined to be appropriate. Therefore, the process proceeds to step S508. In step S508, the modification / editing / quotation appropriateness determination unit 107 determines whether or not the citation data exists in the modified content data. If citation data exists in the modified content data, the process proceeds to step S510. On the other hand, if there is no citation data in the modified content data, the process skips steps S510 and S511 and proceeds to step S512.

  In step S <b> 510, the alteration / editing / quotation appropriateness determination unit 107 determines whether the citation is appropriate in the modified content data, and outputs the determination result as appropriateness determination result data 214. If the determination result that the citation is appropriate is indicated in the appropriate determination result data 214, the process proceeds to step S512. On the other hand, when the determination result that the citation is not appropriate is indicated in the appropriate determination result data 214, the process proceeds to step S511. In step S511, the modified content data is not registered in the content database 102, and the display / modification unit 110 corrects the citation according to the operation of the modifier B.

  Note that the criterion for determining whether or not the citation in step S510 is appropriate is set in advance. For example, whether or not the ratio of the area occupied by the citation data portion to the projected screen size is equal to or less than a certain value. Is the criterion. Here, it is assumed that the citation is determined to be appropriate even after modification by the modifier B. As described above, when it is determined that the modification and citation are appropriate for the modification by the modifier B, the modification by the modifier B is confirmed, and the modified content data separated for each copyright is temporarily held.

  In step S512, the display / modification unit 110 determines whether the modification of the content data has been completed. When the modification of the content data is finished, the process proceeds to step S513. On the other hand, if the modification of the content data has not ended, the process proceeds to step S504. Here, it is assumed that FIG. 2 is added to the original content data a1 by the modifier C. Therefore, the process proceeds from step S512 to S504. Then, the modified content data 209 is captured by the camera 112 and output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Further, the copyright holder information 210 of the modified part is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Thereafter, the same process as in the case of the modification by the modifier B described above is performed, and if the modification is determined to be appropriate, the modification by the modifier C is confirmed.

  Next, it is assumed that Text2 and citation data 2 are added to the original content data a1 by the modifier B. Therefore, the process proceeds from step S512 to S504. Then, the modified content data 209 is captured by the camera 112 and output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Further, the copyright holder information 210 of the modified part is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. After that, similarly to the modification so far, the separation processing for each copyright of the modified content data (step S505) and the modification appropriateness determination process (step S507) are performed, and if it is determined that the modification is appropriate, step In S510, a process for determining whether or not the citation is appropriate is performed. In this modification by the modifier B, the citation data 2 was added. Here, the ratio of the citation data 2 to the projected screen size exceeds a certain value, and it is determined that the citation is not appropriate. And Accordingly, the modification / editing / quotation appropriateness determination unit 107 outputs the appropriateness determination result data 214 indicating that the citation is not appropriate to the display / modification unit 110, and the modification by the modifier B is not finalized.

  In step S 511, when the citation data 2 is deleted by the modifier B in order to make the citation appropriate, the modified content data 209 is captured by the camera 112, and is displayed from the display / modification unit 110 to the modified / edited content separation processing unit 105. Is output. The copyright holder information of the modified part is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Thereafter, similarly to the modification so far, a separation process for each copyright of the modified content data (step S505), a modification appropriateness determination process (step S507), and a citation appropriateness determination process (step S510) are performed. The citation is determined to be appropriate, and the alteration by the modifier B is confirmed.

In this way, every time content data is modified, appropriateness of modification and citation is repeatedly determined. When the alteration is finally confirmed, the altered content data and the copyright holder information 215 separated for each copyright are output from the alteration / edit / quotation appropriateness determination unit 107 to the encryption processing unit 108. The encryption processing unit 108 acquires the encryption key 217 preset by each copyright holder from the encryption key database 104, and sequentially encrypts the modified content data separated for each copyright with the encryption key of the corresponding copyright holder. Turn into. Here, the encryption process E for encrypting the original content data a1 with the encryption key KeyA and obtaining the encrypted content data Ca1 is expressed as follows.
Ca1 = E (KeyA, a1)
An encryption process E to obtain an encrypted modified portion Cb1 by encrypting the modified portion b1 by the modifier B with the encryption key B and then further encrypting with the encryption key A is expressed as follows.
Cb1 = E (KeyA, E (KeyB, b1))
An encryption process E for obtaining an encrypted modified portion Cc1 by encrypting the modified portion c1 by the modifier C with the encryption key C and then further encrypting with the encryption key A is expressed as follows.
Cc1 = E (KeyA, E (KeyC, c1))

  In this way, the modified content data is separated for each copyright, and multiple encrypted for each copyright. Thereafter, the modified content data 216 separated for each copyright is stored in the content database 102 in step S513.

  Next, reuse of modified content data will be described. The encrypted content data groups Ca1, Cb1, and Cc1 stored in the content database 102 are permitted to be decrypted and reconstructed depending on the usage permission status of the copyright holders A, B, and C. Here, the copyright holders B and C are the same persons as the modifiers B and C. When the reuser D reuses, the content data can be reused in four ways as shown in FIG. 7 depending on the usage permission status of the copyright holders A, B, and C with respect to the reuser D. . That is, when only the copyright holder A gives permission for use to the re-user D, only the original content data a1 can be used as shown at 701 in FIG. When only the copyright holders A and B give permission to the re-user D, use the modified content data composed of the original content data a1 and the modified portion b1 as shown at 702 in FIG. Can do. When only the copyright holders A and C give permission to the re-user D, use the modified content data composed of the original content data a1 and the modified portion c1 as shown by 703 in FIG. Can do. When all the copyright holders have given permission for use to the re-user D, the modified content data including the original content data a1, the modified portion b1, and the modified portion c1 is used as indicated by reference numeral 704 in FIG. be able to. Note that if the copyright holder A does not give permission to the re-user D, none of the content data shown in FIG. 7 can be used.

  Next, a case where editing is performed on original content data will be described. FIG. 8 is a diagram showing the editing content of the content data. The editing process is also performed by the modified content secondary copyright management apparatus shown in FIG. The content data editing process is performed according to the flowchart shown in FIG.

  In the original content data e1 created by the original author E, Text11, Text12, Text13, Text14, Figure11, and cited data 11 are arranged as indicated by reference numeral 801 in FIG. In addition, it is confirmed that the citation data 11 is appropriate for copyright. Such original content data e1 is encrypted with an encryption key KeyE set in advance by the original author E, and stored in the content database 102 as content data Ce1. The encryption key KeyE is stored in the encryption key database 104.

  In step S <b> 901, the display / modification unit 110 outputs the content use permission application 201 for the original content data e <b> 1 to the content use permission determination unit 101. On the content database 102, the content data Ce1 is stored in a data format as shown in FIG. 6 together with the citation data and content data other than the citation data, as well as the key ID, usage permission information, and citation data information.

The content usage permission determination unit 101 acquires the encrypted content data Ce1 and the usage permission information 203 of the copyright owner E (original author E) of the content data Ce1 from the content database 102. In step S902, the content use permission determination unit 101 determines whether the original content data e1 can be used. If the use of the original content data e1 is not permitted, the process ends here. On the other hand, if the use of the original content data e1 is permitted, the process proceeds to step S903. In step S <b> 903, the content use permission determination unit 101 outputs the content data Ce <b> 1 (205) having the data format illustrated in FIG. 6 to the content decryption processing / reconstruction processing unit 103. The content decryption processing / reconstruction processing unit 103 acquires the encryption key KeyE207 from the encryption key database 104, and decrypts the encrypted content data Ce1. Here, the decryption process D for decrypting the encrypted content data Ce1 with the encryption key KeyE and obtaining the original content data e1 is expressed as follows.
e1 = D (KeyE, Ce1)

  The content decryption processing / reconstruction processing unit 103 outputs the original content data e1 (208) to the display / modification unit 110. Thus, the original content data e1 is projected on the whiteboard 114 by the projector 111.

  In step S904, the display / modification unit 110 deletes Text12 and Text14 from the original content data e1 created by the original author E and changes the arrangement of Text11 and Text13 according to the operation of the editor F. I do. Further, the display / modification unit 110 creates the content data f1 by enlarging the figure 11 and the citation data 11 and changing the arrangement in accordance with the operation of the editor F (802 in FIG. 8).

  When editing is completed in this way, the edited content data f1 (209) is captured by the camera 112 and output from the display / modification unit 110 to the modification / edit content separation processing unit 105. The copyright owner information 210 of the edited content data f1 is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Hereinafter, the content data edited in this way may be referred to as edited content data. In step S905, the modification / edit content separation processing unit 105 separates the edit content data f1 input from the display / modification unit 110 for each copyright, and edits the edit content data 211 separated for each copyright. The result is output to the edit amount calculation processing unit 106.

  In step S906, the modification amount / edit amount calculation processing unit 106 calculates an edit amount from the edited content data f1 separated for each copyright. Then, the modification amount / edit amount calculation processing unit 106 sends the calculated edit amount 212 of the edited content data f1 to the modification / edit / quotation appropriateness determination unit 107 together with the copyright information of the edited content data f1 and the edited content data f1. Output. In step S907, the alteration / editing / quotation appropriateness determining unit 107 determines whether editing is appropriate in the edited content data f1, and outputs the determination result as appropriate determination result data 213. A criterion for determining whether editing is appropriate is set in advance. For example, whether the amount of editing is equal to or less than a set value is a criterion. The appropriateness determination result data 213 is output from the modification / editing / quotation appropriateness determination unit 107 to the display / modification unit 110. When the appropriateness determination result data 213 indicating the determination result that editing is not appropriate is output, the process proceeds to step S909. On the other hand, when the appropriateness determination result data 213 indicating the determination result that editing is appropriate is output, the process proceeds to step S908.

  In step S <b> 909, the edited content data f <b> 1 is not registered in the content database 102, and the display / modification unit 110 corrects editing according to the operation of the editor F. Here, it is assumed that editing by the editor F is determined to be appropriate. Therefore, the process proceeds to step S908, and in step S908, the alteration / edit / quotation appropriateness determination unit 107 determines whether or not the citation data exists in the edited content data f1. If the citation data exists in the edited content data f1, the process proceeds to step S910. On the other hand, if there is no citation data in the edited content data f1, the process skips steps S910 and S911, and proceeds to step S912.

  In step S <b> 910, the alteration / editing / quotation appropriateness determination unit 107 determines whether the citation is appropriate in the edited content data f <b> 1 and outputs the determination result as appropriateness determination result data 214. If the determination result that the quotation is appropriate is indicated in the appropriate determination result data 214, the process proceeds to step S912. On the other hand, when the determination result that the quotation is not appropriate is indicated in the appropriate determination result data 214, the process proceeds to step S911. In step S <b> 911, the edited content data f <b> 1 is not registered in the content database 102, and the display / modification unit 110 corrects editing according to the operation of the editor E.

  Note that a criterion for determining whether or not the citation in step S910 is appropriate is also set in advance. For example, whether or not the ratio of the area occupied by the citation data portion to the projected screen size is a certain value or less. Is the criterion. Here, since the citation data 11 is enlarged after editing by the editor F, it is assumed that the area of the portion of the citation data 11 exceeds the determination criterion and is determined to be inappropriate. In this case, appropriateness determination result data 214 indicating that the quotation is not appropriate is input to the display / modification unit 110, and editing by the editor F becomes invalid. Next, the display / modification unit 110 reduces the citation data 11 to make the citation appropriate in accordance with the operation of the editor F, makes the area equal to or less than the criterion, and creates the edited content data f1 ′ (FIG. 8 of 803).

When editing is completed in this way, edited content data f1 ′ (209) is captured by the camera 112 and output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Further, the copyright holder information 210 of the modified part is also output from the display / modification unit 110 to the modification / edit content separation processing unit 105. Thereafter, as with the editing so far, the editing content data f1 ′ is subjected to the copyright separation processing (step S905), the editing appropriateness determination processing (step S907), and the quotation appropriateness determination processing (step S910). The citation is determined to be appropriate, and editing by the editor F becomes valid. After the editing is completed, the original content data e1 is encrypted with the encryption key KeyE of the copyright holder E. Here, the encryption process E for encrypting the original content data e1 with the encryption key KeyA and obtaining the encrypted content data Ce1 is expressed as follows.
Ce1 = E (KeyE, e1)

Similarly, the content data f1 ′ edited by the editor F is sequentially encrypted by the encryption keys KeyE and KeyF of the copyright holders E and F. Here, the encryption processing E for obtaining the encrypted content data Cf1 ′ by encrypting the content data f1 ′ with the encryption key KeyE and further encrypting with the encryption key KeyF is expressed as follows.
Cf1 ′ = E (KeyF, E (KeyE, f1 ′))

  The encrypted content data Ce1 and Cf1 ′ are stored in the content database 102. The edited content data f1 ′ obtained in this way can be reused if the use permission is given by the original author E and the editor F. FIG. 10 is a diagram schematically showing a state in which the original content data e1 and the edited content data f1 are decrypted at the time of reuse. As indicated by 1001 in FIG. 10, the original content data e1 is decrypted with the encryption key E set by the editor E. Further, as indicated by 1002 in FIG. 10, the original content data f1 ′ is decrypted with the encryption key E set by the editor E and the encryption key F set by the editor F.

  Note that the flowchart shown in FIG. 5 and the flowchart shown in FIG. 9 can be combined. In other words, a process for determining whether it is a modification or an edit is inserted between steps S502 and S503 in FIG. 5. If it is a modification, the process after step S503 in FIG. In this case, the processing after step S903 in FIG.

  In the above-described embodiment, the image data projected by the projector 111 has been described as an example, but the same processing can be performed using image data displayed on a direct-view display. The type of display applicable to the present invention is not limited to the direct view type. In the above-described embodiment, the modified content data and the edited content data are generated from the image data captured by the camera 112, but the generation method of the modified content data and the edited content data is limited to this. is not. For example, modified content data or edited content data may be generated from image data displayed on the display.

  In the above-described embodiment, strict modification, citation, and editing management can be performed even in modified content data or edited content data. In addition, since the copyright of the modified content data or the edited content data corresponds to the encryption key, the content data can be reconfigured according to the permission status of each copyright holder. Further, in the above-described embodiment, even if the content data has been modified or edited multiple times, the content data can be reused because the copyright history is hidden and the necessary modification or editing is targeted. It becomes possible.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  100: Modified content secondary copyright management device 101: Content use permission determination unit 102: Content database 103: Content decryption processing / reconstruction processing unit 104: Encryption key database 105: Modified / edited content separation processing unit 106: Modification / editing amount calculation processing unit 107: Modification / editing / quotation appropriateness determination unit 108: Encryption processing unit 110: Display / modification unit

Claims (8)

An input means for entering author information;
Display control means for decrypting the content encrypted with the first encryption key corresponding to the author information with the decryption key corresponding to the first encryption key and displaying it as display content;
Adding means for adding additional content to the display content;
Calculating means for calculating a change amount of the content due to the addition of the additional content to the display content;
Changing means for changing the additional content according to the amount of change calculated by the calculating means;
The second encryption key corresponding to the author information input by the input means as the author information corresponding to the additional content, and the change with the second encryption key different from the first encryption key Encryption means for encrypting the additional content changed by the means;
Imaging means for imaging a content display screen;
Have
The encryption unit does not exist in the first captured image obtained by the first imaging on the display screen by the imaging unit, and the second obtained by the second imaging on the display screen by the imaging unit. Information processing characterized in that the additional content present in the captured image is encrypted with the second encryption key corresponding to the author information input by the input means in response to the second imaging. apparatus. A holding unit that holds the content in association with user information that permits the use of the content;
Determination means for determining content permitted to be used by the user information among the display content and the additional content using information held in the holding means;
2. The decrypting unit according to claim 1, further comprising: a decrypting unit configured to decrypt the content determined to be permitted by the determining unit with a decryption key corresponding to the author information corresponding to the content. Information processing device.   The information processing apparatus according to claim 1, wherein the changing unit changes the additional content when the amount of change calculated by the calculating unit is equal to or greater than a threshold value. The size of the display screen of the content encrypted with the encryption key corresponding to the author information when citation data corresponding to different author information from the author information to which the additional content is added is added as the additional content Calculating means for calculating the ratio of the cited data to
When the ratio calculated by the calculation means is equal to or greater than a predetermined ratio, changing means for deleting or reducing the cited data;
Information processing apparatus you characterized in that it has a. An information processing method performed by an information processing apparatus,
An input process for entering author information;
A display control step of decrypting the content encrypted with the first encryption key corresponding to the author information with the decryption key corresponding to the first encryption key and displaying it as display content;
An additional step of adding additional content to the display content;
A calculation step of calculating a change amount of the content due to the addition of the additional content to the display content;
A changing step of changing the additional content according to the amount of change calculated by the calculating step;
The second encryption key corresponding to the author information input in the input step as the author information corresponding to the additional content, and the change with the second encryption key different from the first encryption key An encryption step of encrypting the additional content changed by the step;
An imaging process for imaging a content display screen;
Including
In the encryption step, the second image obtained by the second imaging on the display screen by the imaging step does not exist in the first captured image obtained by the first imaging on the display screen by the imaging step. Information processing characterized in that the additional content existing in the captured image is encrypted with the second encryption key corresponding to the author information input in the input step according to the second imaging. Method. A holding step of associating the content with the user information permitted to use the content in the memory;
A determination step of determining content permitted to be used by the user information, out of the display content and the additional content, using information stored in the memory;
The decryption step of decrypting the content determined to be permitted by the determination step with a decryption key corresponding to the author information corresponding to the content . Information processing method. An information processing method performed by an information processing apparatus,
The size of the display screen of the content encrypted with the encryption key corresponding to the author information when citation data corresponding to different author information from the author information to which the additional content is added is added as the additional content A calculation step of calculating a ratio of the cited data to
When the ratio calculated by the calculation step is equal to or greater than a predetermined ratio, a change step for deleting or reducing the cited data;
Information processing how to comprising a. The program for functioning a computer as each means of the information processing apparatus of any one of Claims 1 thru | or 4.

Images