JP4087836B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to a so-called copy guard function for preventing unauthorized copying of an original by an image forming apparatus, an image reading apparatus, and the like, and particularly to a technique for realizing the copy guard function using unique information of the original.

Conventionally, as a function for preventing unauthorized copying of a document, as disclosed in Patent Document 1, when a copy prohibition mark (pattern) or a copy permission mark (pattern) is previously added to a document and a document image is read In addition, there is known a function (referred to as a copy guard function or a copy protection function) for prohibiting or permitting reading of an original image or copy output (print output) depending on the presence or absence of the mark.
In recent years, the problem of illegal copying of copyrighted works and banknotes has been addressed, and various techniques using the above copy guard function have been proposed. A technology that embeds copy prohibition information and invisible copy prohibition information in image data (electronic data) before printout and includes the copy prohibition information in printed matter when the image data is printed out is also disclosed in Patent Document 3 Discloses a technique for restricting a new copy based on a copy, that is, a secondary copy by giving a copy prohibition pattern to a copy of a document.
JP 2000-165575 A JP 2001-215852 A JP 2003-8864 A

However, with the conventional copy guard function including the technology described in each of the above patent documents, for example, a copy permission mark cut from another document is pasted on a system in which only a document with a copy permission mark is permitted. However, there is a problem that a copy-prohibited document on which this is pasted can be copied. In addition, there is a problem that a system in which copying of only a document with a copy prohibition mark is prohibited makes it possible to easily copy the copy prohibition document by removing the copy prohibition mark. When such illegal copying is made, the copy obtained from the unauthorized copy is not copy-guarded, so the outflow of the original copy is accelerated and the above problem is extremely serious. Of course, it is conceivable to use the above extremely complicated mark as a method for eliminating such a problem. However, the copy-prohibited manuscript can be copied only by attaching or removing the mark. There is no change.
Accordingly, the present invention has been made in view of the above circumstances, and the object of the present invention is to use original information of a document as a mark added to the document in order to permit or prohibit copying of the document. An object of the present invention is to provide a more advanced copy guard function by making it possible to determine the legitimacy of a mark contained in an image of a read document and accurately discriminating whether to permit or prohibit copying.

In order to achieve the above object, the present invention includes an image reading device that scans an image printing surface of a document and reads the image data of the document, and performs an image forming process based on the image data read by the image reading device. An image forming apparatus comprising: copy guard information determining means for determining whether or not copy guard information including at least specific information of the image data is added to the read image data; and the read image data At least when it is determined by the copy guard information determining means that the copy guard information is added, and at least when the copy guard information determining means detects correctness determination information including correctness determination information including unique information of the image data. Depending on whether or not the unique information included in each of the copy guard information and the validity judgment information matches, A legitimacy judging means for judging legitimacy of the copy information, and the image formation when the copy guard information is judged to be legitimate by the legitimacy judging means for the image data read by the image reading device. A copy guard processing means for prohibiting or permitting the processing, and when the image formation processing is permitted by the copy guard processing means, the copy guard information added to the read image data is deleted and the copy Secondary copy guard information generating means for generating secondary copy guard information different from the guard information, and reading the secondary copy guard information generated by the secondary copy guard information generating means during the image forming process. Secondary copy guard information adding means for adding to the recording paper together with the received image data. It is configured as an image forming apparatus according to. Thereby, copy guard information unique to the original is added to the printed matter obtained by the image forming process, that is, the original, and as a result, for example, the unique information calculated from the image data of the original read by the copying machine. It is possible to accurately discriminate permission or prohibition of copy output of a document by comparing and determining a match / mismatch between unique information included in the copy guard information added to the document and the copy guard information. As a result, unauthorized copying is reduced, and an advanced copy guard function can be realized.
Here, as the copy guard information, information including identification information of the image forming apparatus can be considered in addition to the individual information. If such copy guard information is added to the document, it is possible to prohibit copy output by a copying machine that does not match the identification information.
The copy guard information may be copy prohibition information or copy permission information. Regardless of the information, the effect as a copy guard function is exhibited. Of course, the copy guard information may include both copy prohibition information and copy permission information.
As the unique information, checksum data obtained from the image data, a hash value, the number of edges, a total value of pixel density (gradation degree), or the like can be considered. Of course, these plural pieces of unique information may be used in combination.
Further, in order for the copy guard information to make it difficult to specify the position of the added information, various information (identification information, unique information, etc.) included in the copy guard information is predetermined on the recording paper. It is desirable to add to one or more areas. Furthermore, as a more preferable form, it can be considered that the copy guard information is invisible information to which a digital watermark or the like is applied.

The image forming apparatus according to the present invention, even if the copy guard information of other document temporary has to read the original image pasted cut away, the validity of the copy guard information in this case Is denied. For such a negative document image, the subsequent processing is interrupted (canceled), or the read image data is deleted to effectively prevent unauthorized copying based on the illegally read image data. It becomes possible to do. As a result, a more advanced copy guard function can be realized .
Also, if it contains the identification information of the predetermined image forming apparatus to the copy guard information, the validity judging means, and the identification information of the identification information contained in the copy guard information and the image forming apparatus It may be further determined whether or not they match. This makes it possible to reduce unauthorized copying more effectively, for example, by restricting copy output only in matching image forming apparatuses and prohibiting copy output in other image forming apparatuses. it can.

In the image forming apparatus according to the present invention, for example , if the copy guard information is determined to be valid when the copy guard information is copy permission information, a copy output process is executed. It is possible to execute an output prohibition process, a draft print process, a solid black print process (all of which are examples of a copy guard process), or the like. Of course, when the copy guard information is copy prohibition information, copy output prohibition processing or the like is executed when it is determined to be valid, and copy output processing is executed when it is determined that the copy guard information is not valid.
The image forming apparatus according to the present invention deletes the copy guard information added to (included in) the read image data when copy output (image forming processing) is permitted, and the copy guard information. Ru der that is configured to different secondary copies generates guard information, adds the secondary copy guard information said generated on the recording paper together with the read image data during the image forming process and . Due to the recent advancement of image forming technology, even a copy of a document may have an image quality comparable to that of the document. In this case, it may be possible that the unique information of the original and the unique information of the copy match. For this reason, the copy guard information of the original and the copy guard information (secondary copy guard information) of the duplicate are clearly differentiated so as to prevent unauthorized copying of the original by pasting or removing the copy guard information. Can do. Note that the secondary copy guard information may include information unique to the read image data or identification information of the image forming apparatus, similarly to the copy guard information.

  According to the present invention, since copy guard information unique to the original is added to the printed matter obtained by the image forming process in the image forming apparatus such as a printer, that is, the original, it is read by, for example, a scanner or a copying machine. The validity of the copy guard information can be determined by comparing and determining whether the unique information calculated from the image data of the document matches the unique information included in the copy guard information added to the document. It becomes. As a result, it is possible to accurately discriminate permission or prohibition of copy output of an original, and as a result, unauthorized copying can be reduced and an advanced copy guard function can be realized.

Hereinafter, embodiments and examples of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The embodiments and examples described below are examples embodying the present invention, and do not limit the technical scope of the present invention.
<< First Embodiment >>
First, the image processing system X (hereinafter abbreviated as “system X”) according to the first embodiment of the present invention will be described with reference to FIGS. Here, an example in which a copy permission mark (corresponding to copy permission information), which is an example of copy guard information, is added (printed) to a recording sheet. FIG. 1 is a block diagram for explaining a schematic configuration of the system X and the terminal device X1 and printer X2 constituting the system X, and FIG. 2 shows a procedure of a copy permission mark adding process executed by the CPU of the terminal device X1. FIG. 3 is a flowchart for explaining an example of a procedure of a copy permission mark generation process executed by the CPU of the terminal device X1, and FIG. 4 is a diagram showing an area for adding and adding a copy permission mark.

  As shown in FIG. 1, the system X performs data communication by connecting a terminal device X1 such as a personal computer or PDA as an example of an information processing control device and a printer X2 as an example of an image forming device via a LAN 100. It is configured under a possible communication environment. In the first embodiment, an example in which only the terminal device X1 and the printer X2 are connected will be described. However, the present invention is not limited to this example. The present invention can be applied even in a system form in which and are connected via a network such as a LAN.

The printer X2 is an apparatus that executes image forming processing, that is, print processing (print output processing) for forming image data input from the terminal device X1 on a recording sheet accommodated in the printer X2. , Laser printers, ink jet printers and the like. Of course, it may be a multifunction peripheral (MFP) having various functions such as a printer function, a copying function, and a facsimile function.
As shown in the figure, the printer X2 includes a LAN connection I / F 121 such as a LAN adapter that can be connected to the LAN 100, processing for converting input image data into data printable by the printer X2, printing, An image processing control unit 122 that performs and controls various image processes according to conditions, and a visible image (for example, a toner image) according to the image data processed by the image processing control unit 122 is transferred to a recording sheet. The image forming unit 123 (formed) is generally configured.
The image processing control unit 122 includes a known control device. Specifically, the CPU 122a, a program ROM 122b for storing a program required for image processing, an image memory 122c for storing or temporarily storing image data, and an image processing time A RAM 122d used as a development area for image data and the like, a data memory 122e for storing various data, and the like. Of course, the control device is not limited to such a configuration, and may be configured by an integrated circuit such as a memory built-in ASIC.

As shown in the figure, the terminal device X1 has a LAN connection I / F 111 that enables connection to the LAN 100, an HDD 112 that stores image data such as document data and image data, and image data output to the printer X2. A printer driver 113 that controls image forming processing (printing processing) by the printer X2, a copy permission mark combining unit 124 that combines image data to output a copy permission mark, which will be described later, and a CPU 115 that performs overall control of the terminal device X1. , And other control devices such as RAM and ROM (not shown).
The printer driver 113 is software that is embodied by a program stored in a ROM or the like being read and executed by the CPU 115. The printer driver 113 has a copy guard setting function, that is, a copy permission mark setting function for setting whether or not to generate a copy permission mark including unique information of image data output from the terminal device X1 to the printer X2 when executing print output. 113a (corresponding to a copy guard information generation enable / disable setting function) and a copy permission mark generating function 113b (corresponding to a copy guard information generating function) for generating the copy permission mark in accordance with this setting are provided. The copy permission mark setting function 113a is, for example, an item that determines whether or not a copy permission mark can be generated provided on a known print condition setting screen (referred to as a property screen, driver utility screen, etc.) in the printer driver 113. This is realized by selecting or the like. The copy permission mark generation function 113b will be described later with reference to FIG.

The copy permission mark combining unit 114 is an integrated circuit or the like having a function of combining the copy permission mark generated by the printer driver 113 and the image data read from the HDD 112, and specifically, an IC or the like. It is comprised by the hardware equipment of. Of course, the CPU 115 may be configured to execute the synthesis on software.
The copy permission mark is printed on recording paper together with image data when printed out by the printer X2, and is a mark for permitting copying (duplication, copying) of printed matter printed out. . In the first embodiment, the copy permission mark is defined such that copying is permitted only to the printed material to which the copy permission mark is added, and copying of the printed material not added is prohibited. Various types of copy permission marks can be considered, and details will be described later.

Here, an example of the procedure of the copy permission mark adding process executed by the CPU 115 will be described with reference to the block diagram of FIG. 1 and the flowchart of FIG. 2, S10, S20,... Indicate processing procedure (step) numbers. The copy permission mark addition process is started from step S10.
When the operator sets predetermined printing conditions and the like in the printer driver 113 and then performs an operation for executing print output for the image data, the processing after step S10 is executed before the image data is output to the printer X2. Is done.
First, in step S10, the CPU 115 determines whether or not generation of a copy permission mark is set depending on whether or not the copy guard function is set in the printer driver 113 (specifically, the copy permission mark setting function 113a).
If it is determined that the copy guard function is not set, the process proceeds to step S40, and the image data is output to the printer X2 without adding (combining) the copy permission mark to the image data. That is, normal print output is executed.
On the other hand, if it is determined that the copy guard function is set, the process proceeds to step S20. In step S20, the above-described copy permission mark is generated. Such processing will be described later.

When the copy permission mark is generated in step S20, subsequently, in step S30, the copy permission mark combining unit 114 executes a process of combining and adding the generated copy permission mark to the image data to be printed out. For example, for the image data 130 shown in FIG. 4, the copy permission mark is synthesized and added to the area P1 at the lower right end of the image data 130. In this case, when the copy permission mark is composed of a plurality of pieces of information (such as identification information of the printer to be output and unique information of the image data), it is not necessary to add all of the plurality of pieces of information to the area P1, for example, You may distribute and add to other area | regions P2 and P3 shown in FIG.
For the copy permission mark, for example, a visible image made of a barcode, an encrypted symbol or a character string, or an invisible image such as a digital watermark can be applied. At this time, for example, when a copy permission mark for a visible image is used, in the vicinity of the edge of the image data (for example, the above-described areas P1, P2, and P3) where no text or the like is described (low gradation or density) It is desirable to combine and add the above copy permission mark. However, when using an invisible copy permission mark, add a watermark or the like in the area (high gradation or density) where the text or image is written. It is desirable.
In step S40, the image data to which the copy permission mark is added is output to the printer X2.
The image data output in this way is input to the printer X2, and the image data to which the copy permission mark is added is printed on the recording paper in the printer X2.
As described above, since information unique to the printed matter is added as a copy permission mark to the printed matter obtained by the printing process, even if this mark is pasted on a copy-prohibited document, a copy permission determination described later is performed. Copying is prohibited by the processing (see FIG. 7).

Next, an example of the procedure of the copy permission mark generation process executed by the CPU 115 will be described using the flowchart of FIG. The process starts from step S21.
In step S21, the CPU 115 calculates unique information of the image data. The unique information includes various data such as checksum data, hash value, number of edges, or total pixel density obtained from the image data. Any of these data may be calculated. However, in this step S21, the hash value and the number of edges are calculated from the unique information.

  When the hash value and the number of edges are calculated, in step S22, it is determined whether or not the specific information has a data amount equal to or larger than a predetermined amount. This is a determination process that is executed in consideration of the fact that there is a possibility that the calculated unique information is insufficient for use as a copy permission mark when the amount of information of the image data itself is small. Here, if it is determined that the amount is greater than or equal to a certain amount, the process proceeds to step S25. On the other hand, if it is determined that the amount is less than a certain amount, unique information (for example, checksum data) different from the previously calculated unique information (here, the hash value and the number of edges) is calculated (S23). The calculated checksum data is added to the previously calculated unique information (S24), and then the process of step 22 is executed again.

When the process proceeds to step S25, here, a process of acquiring identification information of a copying machine (not shown) that limits copy output is performed. For example, when a plurality of MFPs are connected to the LAN 100 in an office or the like, it is conceivable that the MFP designated via the LAN 100 is accessed for acquisition. Of course, when the identification information of a plurality of copying machines or MFPs is stored in advance in the storage unit or the like of the terminal device X1, it is sufficient to acquire the identification information of the MFP or the like whose use is limited from the storage unit. As the identification information, an artificially determined ID code, an IP address automatically assigned for network connection, or the like can be used.
In step S26, a copy permission mark is generated from the unique information and the identification information. As a mark generated at this time, various forms such as a combination of the unique information and the identification information according to a predetermined algorithm (rule), a barcode, a digital watermark, and the like are conceivable.

In the first embodiment described above, an example in which the copy permission mark is generated in the terminal device X1 and the copy permission mark is synthesized and added to the image data and then output to the printer X2 has been described. It is not limited to. For example, if the copy guard function is set in the terminal device X1, the terminal device X1 performs processing for outputting the setting information together with image data to the printer X2, while the printer X2 side In another embodiment, the copy permission mark generation process (FIG. 2) in step S20 and the copy permission mark composition addition process (FIG. 2) in step S30 may be performed based on the input setting information. In this case, the processing subject of the copy permission mark generation processing and the composition addition processing is the image processing control unit 122 (CPU 122a) of the printer X2.
In the first embodiment described above, an example in which a copy permission mark is used as an example of copy guard information has been described. Of course, a copy prohibition mark (corresponding to copy prohibition information) is also an example of copy guard information.

<< Second Embodiment >>
Next, a copying machine X4 (an example of an image forming apparatus) provided with a scanner device X3 (an example of an image reading apparatus) according to a second embodiment of the present invention will be described with reference to FIGS. Here, an example will be described in which copy output is permitted / prohibited depending on whether a read original image includes a copy permission mark or a copy prohibition mark. FIG. 5 is a schematic sectional view for explaining the schematic configuration of the copying machine X4. FIG. 6 is a block diagram showing the schematic configuration of the main control unit of the copying machine X4. FIG. 7 is executed by the CPU of the main control unit. FIG. 8 is a flowchart for explaining another example of the procedure for the copy permission determination process.
First, the outline of the overall configuration of the copying machine X4 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5A is a front sectional view of the copying machine X4, and FIG. 5B is a plan view taken along the line AA in FIG. In the second embodiment, the copying machine X4 will be described as an example of an image forming apparatus. However, the present invention is not particularly limited to this. For example, a copying function (copying function), a facsimile function, and a scanner function. It may be a multifunction peripheral (MFP) having various functions such as a network printer function.

As shown in FIG. 5, the copying machine X4 is roughly classified into a scanner device X3 for reading a document image, and an automatic document feeder 10 (hereinafter referred to as “ADF10”) disposed above the scanner device X3. The operation display unit 30 disposed on the front side surface, the image forming unit 16 and the fixing device 17 disposed below the scanner device X3, the paper feed cassette 18 disposed below, and the above-described units. And a main control unit 15 for comprehensively controlling the copying machine X4.
The documents S set on the document setting unit 11 of the ADF 10 are sequentially conveyed one by one through a plurality of conveyance rollers R, sent out in a sub-scanning direction through a predetermined reading position on the contact glass 26, and Thereafter, the document is discharged to the document discharge unit 13.
The document S moving in a sub-scanning direction at a predetermined reading position on the contact glass 26 is irradiated with light by the exposure device 21, and the reflected light from the document S passes through the light guide mirrors 22, 23a, 23b. Then, after being guided to the optical lens 24 and condensed (converged) by the optical lens 24, it is detected by the CCD 25. The CCD 25 converts the detected light into an electrical signal, and the main control unit 15 recognizes image data based on the converted electrical signal. The main control unit 15 performs image processing such as copy permission determination processing described later on the image data read as described above.

  The image forming unit 16 includes known image forming components such as a photosensitive drum 161, a charging device 162, a developing device 163, a transfer device 164, and a cleaning device 165. The recording paper onto which the toner image has been transferred by the transfer device 164 of the image forming unit 16 is conveyed to a fixing device 17 provided on the downstream side in the conveying direction, and a fixing roller 171 (a fixing heater is incorporated in the fixing device 17). ) And the pressure roller 172 opposed thereto, the toner image on the recording paper is melted and fixed by the heat of the fixing roller 171.

On the front side surface of the copying machine X4, there is provided an operation display section 30 (see FIG. 1B) for displaying various function setting inputs or predetermined information in the copying machine X4. The operation display unit 30 includes operation input means such as push button switches and numeric keys, and display means such as a liquid crystal display.
When the copying machine X4 requests a login input from the user who uses the copying machine X4, the user uses the operation display unit 30 to display his or her own user ID code (user information) Enter the authentication code.

As shown in the block diagram of FIG. 6, the main control unit 15 stores a CPU 151, a program ROM 152 that stores a control program for executing a later-described copy permission process and the like, and stores or temporarily stores input image data. An image memory 153 stored in the memory 153, a RAM 154 used as a work area for image processing, a data memory 155 storing various data, an external I / F 156 and other known control devices are connected by an internal bus 157.
In the main control unit 15, the CPU 151 reads the control program stored in the ROM, and executes the calculation process according to the read control program, whereby the copy permission process is performed. The copy permission process will be described below.

Here, an example of a copy permission determination process executed by the CPU 151 of the main control unit 15 will be described with reference to the flowchart of FIG. The copy permission determination process is started from step S110 after the copy start operation is performed in the copying machine X4.
When a copy start operation is performed by the operator, in step S110, the image data of the original is read by the scanner device X3, and then it is determined whether or not the read original image includes a copy permission mark. Processing (copy guard information determination processing) is performed by the CPU 151 (S120). This determination process is performed depending on whether or not the copy permission mark is added to a predetermined area (areas P1, P2, P3, etc. in FIG. 4). The CPU 151 or the main control unit 15 having the CPU 151 when performing such copy guard information determination processing corresponds to copy guard information determination means.
If it is determined that the copy permission mark is not included, the original is recognized as a copy-prohibited original, the subsequent copy operation is interrupted, and the copy output prohibition process (copy guard process) in step S220 is performed. Is equivalent). Specifically, a process of deleting the read image data, a draft print process, and a solid black print process (an example of a copy guard process) are executed.
If it is determined in step S120 that the copy permission mark is included, the processing of steps S130 to S160 described later is executed to determine the validity of the copy permission mark (validity). Determination process) is executed.

That is, first, in step S130, the copy permission mark is extracted from the image data by the CPU 151 and temporarily stored in the data memory 155 (FIG. 6). In step S140, the CPU 151 calculates (detects) at least the unique information of the image data (the unique information at this time corresponds to the validity determination information) from the read image data. For the specific information, refer to the description of the first embodiment. Note that the CPU 151 or the main control unit 15 having the CPU 151 when executing the process for calculating the unique information corresponds to the validity determination information detecting means.
When the unique information is calculated, in step S150, the CPU 151 determines whether or not the unique information calculated in step S140 matches the unique information included in the copy permission mark. If it is determined that they do not match, the process proceeds to step S220, and the copy output prohibition process described above is executed. If it is determined that they match, the process proceeds to step S160.
When the process proceeds to step S160, the CPU 151 determines whether or not the identification information of the predetermined copying machine included in the copy permission mark matches the identification information of the copying machine X4. At this time, if it is determined that the identification information matches, the process proceeds to step S220, and the copy output prohibition process described above is executed. If it is determined that they match, the process proceeds to step S170.
As described above, when both the unique information and the identification information match, it is determined that the copy permission mark is valid. Note that the CPU 151 or the main control unit 15 having the CPU 151 when performing such validity determination processing corresponds to the validity determination means.

Subsequently, when it is determined by the validity determination process that the copy permission mark is valid, the copy permission mark is once deleted from the image data before executing the print output process of the image data. (S170), and thereafter, a process of combining and adding additional information of a predetermined density to the image data is executed (S180). As this additional information, for example, the date of copy output, the user ID code of the operator who performs the copy operation, the number of copies to be copied, and the like are applicable. Of course, it is not limited to these. Such additional information combining processing is performed in order to make the unique information of the read image data different from the unique information of the document.

When the additional information is synthesized and added, in step S190, a process of generating a secondary copy permission mark including unique information of the image data to which the additional information is added is executed. Of course, the secondary copy permission mark may include identification information of the copying machine X4. Then, after the process of combining and adding the generated secondary copy permission mark to the image data to be copied and output is executed (S200), the image data with the combined and added secondary copy permission mark is copied and output ( S210). The processes in steps S190, S200, and 210 are substantially the same as the processes in steps S20, S30, and S40 in FIG. 2 described in the first embodiment, although the processing subject is different. The explanation here is omitted. Note that the process of outputting a copy through the processes in steps S170 to S210 after it is determined that the copy permission mark is valid is an example of a copy guard process.
In this way, since the legitimacy of the copy permission mark is determined by comparing the unique information of the image data, when the copy guard information of another document is cut and pasted, the document image is read. Even in this case, the validity of the copy guard information is denied in this case. In addition, for the document image denied in this way, the subsequent processing is interrupted (canceled), or the read image data is deleted, so that illegal copying based on the illegally read image data is effective. Can be prevented. As a result, a more advanced copy guard function can be realized.

In the above description, the example in which it is determined whether or not the copy permission mark is added to the read image data has been described. However, as a matter of course, it is determined whether or not the copy prohibition mark is added. It may be an example in which the permission or prohibition of copy output is determined by determining the legitimacy of the copy prohibition mark. Here, the procedure of a copy permission determination process for determining the validity of the copy prohibition mark and determining permission for copy output will be described with reference to the flowchart of FIG. It should be noted that the same process as the copy permission determination process shown in the flowchart of FIG.
When a copy start operation is performed and the image data of the document is read (S110), a determination process is then performed as to whether or not a copy prohibition mark is included in the read document image (S120a). If it is determined that the copy prohibition mark is not included, it is determined that the original is not a copy prohibited original, the process proceeds to S210, and a normal copy output process is performed. On the other hand, if it is determined in step S120a that the copy prohibition mark is included, then in step S130a, the CPU 151 extracts the copy prohibition mark from the image data, and the data memory 155 (FIG. 6) is temporarily stored. In step S140, the unique information of the image data is calculated (detected).
When the unique information is calculated, in step S150a, the CPU 151 determines whether the unique information calculated in step S140 matches the unique information included in the copy prohibition mark. If it is determined that they do not match, the process proceeds to step S170 described later. If it is determined that they match, the CPU 151 determines in step S160a whether the identification information of the predetermined copying machine or the like included in the copy prohibition mark matches the identification information of the copying machine X4. Is done. At this time, if it is determined that the identification information matches, the legitimacy of the copy prohibition mark is recognized, that is, the document is recognized as a copy prohibition document, and the subsequent processing proceeds to step S220. The copy output prohibition process is executed. If it is determined that the identification information does not match, the process proceeds to step S170.
When the process proceeds to step S170, before executing the print output process of the image data, a process for deleting the copy permission mark from the image data (S170), and then adding the additional information to the image data. Next, a process for generating a secondary copy prohibition mark including the unique information of the image data to which the additional information is added is executed (S90a). Then, after the process of combining and adding the generated secondary copy prohibition mark to the image data to be copied and output is executed (S200a), the image data with the combined and added secondary copy permission mark is copied and output ( S210).
In the copy permission determination process described above, there is a problem that copy output is executed because the identification information does not match even though the unique information of the image data to which the copy prohibition mark is added matches. However, this problem is suppressed by using a copy permission mark and a copy prohibition mark together.

<< Third Embodiment >>
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a table diagram defining the copy permission level and the copy prohibition level according to the user level, FIG. 10 is a flowchart for explaining the procedure of a modification of the copy permission mark addition process, and FIG. It is a flowchart explaining the procedure of a modification.
In the third embodiment, a modification of the copy permission mark addition process (see FIG. 2) described in the first embodiment and a modification of the copy permission determination process described in the second embodiment. Will be described. Unless otherwise stated, the system configuration and hardware configuration in the third embodiment are the same as the system X in the first embodiment and the scanner device X3 and the copier X4 in the second embodiment. I will omit the explanation.
The third embodiment differs from the first and second embodiments in that the table shown in FIG. 9 is used in the copy permission mark addition process and the copy permission determination process. First, the table in FIG. 9 will be described below.

FIG. 9 is broadly divided into a table (a) used for determining whether or not a copy permission mark can be added when a copy permission mark is added, and the copy prohibition mark when a copy prohibition mark is added. Are classified into a table (b) used for determining whether or not a copy can be added and a table (c) showing an example of setting a copy permission level and a copy prohibition level. These tables are stored in advance in the HDD 112 (FIG. 1) of the terminal device X1 of the system X.
Here, the table (a) will be described.
This table (a) is divided into a user level item and a copy permission level item. The user level indicates the rank (rank) of users (users). In this embodiment, the data level is ranked in the order of data creator, manager (data manager), and general user. The copy permission level indicates a target person to whom the ranked user can restrict copy output. For example, when the person who sets the copy guard function in the terminal device X1 or the copying machine X4 is the creator of the image data, “◯” in the table (a) indicates a general user, a manager (data manager), Since it is written in any of the data creators, it is shown that any person can be restricted in whether or not copy output is possible. If the person who sets the copy guard function is an image data manager, “○” in the table (a) is written in the general user and manager (data manager). The copy creator can be restricted from copying output, but the data creator is marked with an “x”, indicating that the data creator cannot be restricted from copying output. ing. That is, the administrator cannot set copy permission / non-permission for the data creator. Similarly, if the person who sets the copy guard function is a general user, it indicates that only the general user can be restricted in copy output. Each of the user levels thus classified is assigned an identification code. For example, it is assumed that a general user is “AA”, an administrator is “BB”, and a data creator is “CC”. These identification codes are simple codes for ease of explanation, but are not limited to these. In the third embodiment, classification is made into three user levels, but it may be further subdivided.
The table (b) shows the user level when setting the copy prohibition mark and the copy prohibition level corresponding to the copy permission level, and is basically the same as the table (a). Description is omitted.

On the other hand, the table (c) shows a setting example of the copy permission level and the copy prohibition level when the copy permission mark and the copy prohibition mark are added, and (c1) is a table when the user level is a general user. , (C2) is a table when the user level is an administrator, and (c3) is a table when the user level is a data creator.
For example, in the table (c1) when the user level is a general user, it is shown that copying by a general user is completely prohibited. The table (c2) in the case where the user level is an administrator indicates that copying is possible when the copy permission level is equal to or lower than the administrator and the copy prohibition level is a general user. The table (c3) in the case where the user level is the data creator indicates that copying is possible when the copy permission level is lower than the data creator and the copy prohibition level is lower than the administrator.

Next, the procedure of a copy permission mark addition process (modified example) executed by the CPU 115 of the terminal device X1 of the system X will be described using the flowchart of FIG. The process starts from step S310.
In step S310, processing for determining whether or not a login input has been made on the printer driver is executed by the operator. Specifically, when the printer X2 that requests login is set as a device for printing out, the login is performed by inputting a user ID code or the like in response to a request from the printer X2 or a request from a printer server (not shown). An operator is authenticated by determining whether or not the input user ID code matches user registration information (corresponding to user information) registered (stored) in advance in the printer server or the like. User authentication processing is executed. In this case, if the input user ID codes match, login is permitted, but if they do not match, login is not permitted and use of the printer X2 is restricted. Note that the ID code input at the time of login is temporarily stored in the HDD 112 (FIG. 1) or the like until logout.

When the login input from the user is confirmed in step S310, it is determined in step S320 whether or not the copy guard function is set in the printer driver 113 (the same processing as S10 in FIG. 2). The determination of whether or not the copy guard function is set at this time is a function for setting whether or not generation of copy permission information, which will be described later, which is an example of copy output restriction information, can be performed. This corresponds to the availability setting function. If it is determined that the copy guard function is not set, the process advances to step S370 to output the image data to the printer X2 without adding (combining) the copy permission mark to the image data. Printing output is executed.
On the other hand, if it is determined that the copy guard function is set, the process proceeds to step S330. In step S330, the CPU 115 executes a user level determination process based on the user ID code input at the time of login. Specifically, based on the user ID code, it is determined whether the user who is currently performing the print output operation (that is, the logged-in user) corresponds to a general user, an administrator, or a data creator. In the following description, for convenience, the above user is described as a data creator. Of course, if the image data can be handled by a person other than the above data creator, an administrator, general user, etc. However, it goes without saying that the same processing is performed.

Subsequently, in step S340, the copy permission level is extracted. Specifically, in the printer driver of the terminal device X1, the extracted copy permission level is determined depending on which user level has been selected as a target for granting copy permission. In this embodiment, in order to explain a processing example of adding a copy permission mark, when the user is a data creator, as shown in the table (a) of FIG. 9, a general user, an administrator, and the data creator himself The printer driver is provided with a setting item for each user level so that a setting for adding a restriction on whether to permit copying can be added to all of the above. In this embodiment, for example, it is assumed that the administrator and the data creator themselves are set as the data permission target by the data creator, and the general user is not set as the copy permission target. Therefore, in this step S340, the data creator and the manager are extracted as copy permission targets.

In step S350, the user level identification code ("CC" in the case of a data worker) determined in step S330 and the set copy permission level identification code (in the case of an administrator and a data creator) are set. A copy permission mark is generated using “BB” and “CC” (the copy permission mark generated at this time corresponds to copy output restriction information). As such a copy permission mark, for example, information “CCBBCC” combining the above identification codes can be considered. Of course, the present invention is not limited to this. For example, it is possible to apply a visible image made up of a barcode, an encrypted symbol or a character string, or an invisible image such as a digital watermark. Note that the generation of the copy permission mark is achieved by the copy output restriction information generation function of the printer driver 113.
Thereafter, the copy permission mark combining unit 114 (FIG. 1) of the terminal device X1 executes a process of combining and adding the generated copy permission mark to the image data to be printed (S360), and then the copy permission mark is combined. The added image data is output to the printer X2 (S370). The processes in steps S360 and S370 are the same as the processes in steps S30 and S40 in FIG. Here, an example in which the copy permission mark is combined and added in the copy permission mark combining unit 114 has been described. Of course, the copy permission mark is combined and added to the image data on the printer X2, and then the printer X2 is used. An example of printout may be used.

The above-described copy permission mark adding process has been described with respect to an example in which image data is printed out from the terminal device X1 by the printer X2. However, when a copy-permitted person copies the image data from the copying machine X4, In addition, it can also be applied when a new copy permission mark is added to the duplicate. In this case, the copying machine X4 is provided with functions equivalent to the copy output restriction information generation enable / disable setting function and the copy output restriction information generation function of the printer driver of the terminal device X1.
In this case, for example, when a person who is permitted to copy is an administrator, and this administrator performs a copy output with the copying machine X4, it is embodied on the operation display unit 30 by the above functions after login. A copy permission level restriction target person (general user, administrator himself) is set on the setting screen, and then the processing from S340 onward is performed, so that a new copy permission mark is also set on the copying machine X4. It becomes possible to add. In this case, it goes without saying that a new setting cannot be made beyond the range of the previously set copy permission level.

Next, the procedure of the copy permission determination process (modified example) executed by the CPU 151 of the main control unit 15 of the copier X4 will be described with reference to the flowchart of FIG. The process starts from step S410.
First, in step S410, processing for determining whether or not a log-in input has been made by the copy operator is executed. Specifically, the user ID code input from the operation display unit 30 (FIG. 6) by the operator in response to the login request from the copying machine X4 is registered (stored) in the data memory 155 in advance. A user authentication process is performed to determine whether or not the registration information matches, and to authenticate an operator who performs an operation of inputting image data to the copying machine X3. Note that the user ID code input in the login input is temporarily stored in the data memory 155 until logout.
After that, when login is permitted (Yes side of S410) and a copy start operation is performed by the operator, the image data of the original is read by the scanner device X3 in step S420, and then the read original image is included in the read original image. The CPU 151 performs a determination process (copy output restriction information determination process) as to whether or not the copy permission mark generated in step S350 is included (S420). The CPU 151 or the main control unit 15 having the CPU 151 when performing such copy output restriction information determination processing corresponds to copy output restriction information determination means.
If it is determined that the copy permission mark is not included, the original is recognized as a copy-prohibited original, the subsequent copy operation is interrupted, and the copy output prohibition process (copy output restriction) in step S470 is performed. Equivalent to the process). Specifically, processing for deleting the read image data, draft printing processing, and solid black printing processing (all of which are examples of copy output restriction processing) are executed.
If it is determined in step S430 that the copy permission mark is included, the processing of steps S440 and S450 described later is executed, so that the copy permission mark and the user ID code input at the time of login are Based on the above, a process for determining whether or not copy output is possible (copy output availability determination process) is executed.

That is, first, in step S440, the CPU 151 extracts the copy permission mark from the image data and temporarily stores it in the data memory 155 (FIG. 6). In step S450, it is determined whether or not the user level of the operator recognized from the user ID code input at the time of login matches the copy permission level included in the copy permission mark. If it is determined that they do not match, the process proceeds to step S470 and the copy output prohibition process described above is executed. If it is determined that they match, the process proceeds to step S460 and copy output of the image data is executed. The For example, when a general user (identification code: AA) tries to copy and output the document with the copy permission mark CCBBCC generated in step S350 (FIG. 10), the identification code AA is the copy permission mark. Since it is not included in the CCBBCC, copying by the general user is prohibited, but when the administrator (identification code: BB) tries to output a copy, the identification code BB is included in the copy permission mark CCBBCC. Therefore, copy output is permitted. In this sense, it can be said that the copy permission mark CCBBCC includes information on persons who can copy and information on those which cannot be copied. That is, it can be said that the copy permission mark includes information for restricting copy output.
As described above, since it is possible to set permission / prohibition of copy output for each user in a document with the copy permission mark (copy output restriction information), the user of the document and the copy guard can be set. The convenience of the function setter can be improved.
In the third embodiment, only the example of adding the copy permission mark has been described. However, referring to the table (b) and the tables (c1), (c2), and (c3) in FIG. The process of adding the copy prohibition mark or both the copy permission mark and the copy prohibition mark can be executed by following the same processing procedure as described above.

  In the first to third embodiments described above, the independent embodiments have been described. Of course, examples in which the respective embodiments are combined are also conceivable. For example, in the third embodiment, the copy permission mark including the unique information of the image data described in the first and second embodiments is added to the copy permission mark adding process (FIG. 10) and the copy permission determining process (FIG. 11). It is also possible to use it.

1 is a block diagram illustrating a schematic configuration of an image processing system X and a terminal device X1 and a printer X2 constituting the image processing system X according to a first embodiment of the present invention. The flowchart explaining an example of the procedure of the copy permission mark addition process performed by CPU of the terminal device X1. The flowchart explaining an example of the procedure of the copy permission mark production | generation process performed by CPU of the terminal device X1. The figure which shows the area | region which synthesizes and adds a copy permission mark. FIG. 9 is a schematic cross-sectional view illustrating a schematic configuration of a copying machine X4 according to a second embodiment of the present invention. FIG. 6 is a block diagram illustrating a schematic configuration of a main control unit of a copier X4 according to a second embodiment of the present invention. 10 is a flowchart for explaining an example of a procedure of a copy permission determination process executed by a CPU of a main control unit of a copier X4 according to a second embodiment of the present invention. 12 is a flowchart for explaining another example of the procedure of the copy permission determination process executed by the CPU of the main control unit of the copier X4 according to the second embodiment of the present invention. The table figure which prescribed | regulated the copy permission level according to a user level. 9 is a flowchart for explaining a procedure of a modification of the copy permission mark addition process. 9 is a flowchart for explaining a procedure of a modification example of the copy permission determination process.

Explanation of symbols

X ... image processing system X1 ... terminal device (an example of an information processing control device)
X2 ... Printer (an example of an image forming apparatus)
X3: Scanner device (an example of an image reading device)
X4: Copier (an example of an image forming apparatus)

Claims (3)

An image forming apparatus that includes an image reading device that scans an image printing surface of a document and reads the image data of the document, and that performs image forming processing based on the image data read by the image reading device,
Copy guard information determining means for determining whether or not copy guard information including at least the unique information of the image data is added to the read image data;
Correctness determination information detecting means for detecting correctness determination information including at least the unique information of the image data from the read image data;
When it is determined by the copy guard information determining means that the copy guard information has been added, the copy guard information is determined depending on whether at least the unique information included in each of the copy guard information and the validity determination information matches. Legitimacy judging means for judging legitimacy of information,
Copy guard processing means for prohibiting or permitting the image forming process when the copy guard information is determined to be valid by the validity determining means for the image data read by the image reading device;
When the image formation processing is permitted by the copy guard processing means, the copy guard information added to the read image data is deleted, and secondary copy guard information different from the copy guard information is generated. Secondary copy guard information generating means for
Secondary copy guard information adding means for adding the secondary copy guard information generated by the secondary copy guard information generating means to the recording paper together with the read image data during the image forming process;
An image forming apparatus comprising: The image forming apparatus according to claim 1 , wherein the secondary copy guard information includes at least one or more of unique information of the read image data and identification information of the image forming apparatus. When the copy guard information includes identification information of a predetermined image forming apparatus, the validity determination means determines whether the identification information included in the copy guard information matches the identification information of the image forming apparatus. The image forming apparatus according to claim 1, further determining whether or not.

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