JP4024419B2 - Unauthorized device detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an unauthorized device detection apparatus that is effective when a plurality of devices connected to a network and capable of digital transmission include an unauthorized device.
[0002]
[Prior art]
In recent years, IEEE 1394 has attracted attention as an interface for transmitting digital data. By using this interface in video equipment or a PC (personal computer), it is possible to transmit content such as image data and audio data with high quality. Therefore, digital data can be easily dubbed by using the IEEE1394 interface.
[0003]
IEEE 1394 supports isochronous transfer in order to transmit image data and audio data in real time. Isochronous transfer is a method of synchronously transmitting content in an isochronous cycle of 125 microseconds. As a result, data is transmitted to the receiver side within a certain time, and even video content is interrupted. It can be received without.
[0004]
In digital transmission such as IEEE 1394, mixing of noise can be prevented, and transmission can be performed without deteriorating signal quality. Therefore, in digital recording using IEEE 1394, it is possible to create a copy of the same quality as the original, and it is necessary to protect the copyright of the information recorded on the recording medium.
[0005]
For this reason, when content having copyright is transmitted by IEEE1394, some measure for protecting copyright has been desired.
[0006]
In order to cope with this problem, standards for copy protection in digital data transmission have been drafted by five companies (SONY, Matsushita, Hitachi, Intel, Toshiba). According to the draft of 5C Digital Transmission Content Protection (hereinafter referred to as the DTCP standard) defined by 5 companies (currently scheduled for standardization in 1999-1-26), prior to the transmission of content, The legitimacy is checked.
[0007]
By transmitting content in accordance with this standard, digital data can be sent and received only between legitimate devices, and digital data cannot be sent and received between unauthorized devices.
[0008]
In order to determine the validity of a device, the DTCP standard adopts a revocation list that is a list of unauthorized devices. The revocation list is managed by an organization called DTLA. The revocation list refers to devices that illegally copy or devices that have lost confidentiality due to leakage of the encryption key used by the device, but these devices are illegal devices. The device number of the device is stored.
[0009]
An unauthorized device list such as a revocation list is written in a storage medium in the device when the device is manufactured, thereby enabling detection of the unauthorized device. That is, each device connected by the IEEE1394 cable reads the unauthorized device list in the storage medium and uses it to determine the validity of the device.
[0010]
In addition, the unauthorized device list can be updated in the device that reproduces the medium by writing the unauthorized device list in the medium on which the content is recorded. Further, by broadcasting the unauthorized device list when broadcasting content, the unauthorized device list can also be updated by receiving it. Further, there is a method in which the list is updated by transmitting / receiving between devices connected by the IEEE 1394 cable and obtaining from the device having the latest revocation list. By obtaining the latest version of the unauthorized device list by these methods, it is possible to ensure the validity of the proper judgment of the device.
[0011]
However, in the DTCP standard, a revocation list distribution method and restrictions on data transmission using the revocation list are partially defined, but a countermeasure method when an unauthorized device is detected is not defined. For example, a notification method to a user when an unauthorized device is detected, a countermeasure method to be taken by the user, a contact method with a device manufacturer or an organization that manages a revocation list, etc. are not stipulated.
[0012]
[Problems to be solved by the invention]
As described above, the distribution of the unauthorized device list and the restriction of data transmission using the distributed unauthorized device list have been defined in the past, but the user cannot know that the data transmission is restricted, and is not necessarily required. There was a problem that it was not always possible to respond sufficiently.
[0013]
The present invention has been made in view of such a problem, and it is possible to detect a fraudulent device that enables a user to take a sufficient measure by notifying information on a fraudulent device connected to the network. An object is to provide an apparatus.
[0014]
[Means for Solving the Problems]
An unauthorized device detection apparatus according to the present invention includes an unauthorized device list holding unit that holds an unauthorized device list that identifies an unauthorized device, and the unauthorized device list holding unit that receives an unauthorized device list from another device and holds the unauthorized device list. Means for updating an unauthorized device list; and detecting means for detecting the presence of an unauthorized device registered in the unauthorized device list by communicating with one or more devices connected on a network; and the detection If it is indicated that one or more devices connected to the network include an unauthorized device registered in the unauthorized device list based on the detection result of the means, digital transmission to the unauthorized device is stopped. Or means for prohibiting, means for performing analog transmission to the unauthorized device whose digital transmission has been stopped or prohibited, and devices connected on the network. When the detection means detects that the equipment is present, one of the devices on the network is the unauthorized apparatus, and means for representing the display showing the connection relationship between devices on the network It is characterized by that.
[0015]
In the present invention, the detecting means communicates with one or more devices on the network, refers to the unauthorized device list held by the unauthorized device list holding means, and detects the presence of the device registered in the unauthorized device list. . The notification means can notify the user of information related to the unauthorized device based on the detection result.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a part of a device in which an unauthorized device detection apparatus according to an embodiment of the present invention is incorporated.
[0017]
1, a plurality of devices a, b,... Are connected on the IEEE 1394 bus 1. The devices a, b,... Are connected to the IEEE 1394 bus 1 via the IEEE 1394 communication unit 2.
[0018]
The IEEE 1394 communication unit 2 transmits and receives data to and from the IEEE 1394 communication unit 2 of other devices via the IEEE 1394 bus 1. That is, the IEEE 1394 communication unit 2 converts the data from the data processing unit 3 into an IEEE 1394 packet and sends the packet to the IEEE 1394 bus 1, and takes in the data transferred to the own device via the IEEE 1394 bus 1. The data is output to the data processing unit 3. Video data, audio data, various commands, and the like can be transmitted by the IEEE 1394 communication unit 2. The IEEE 1394 communication unit 2 executes various communication processes according to the IEEE 1394 specification. For example, the IEEE 1394 communication unit 2 is configured to perform bus arbitration for arbitrating the bus use right and notify the entire bus regarding the traffic status.
[0019]
The unauthorized device list processing unit 4 stores an unauthorized device list in a storage unit (not shown). The unauthorized device list processing unit 4 controls the IEEE 1394 communication unit 2 to read device-specific IDs from other devices, and by comparing the read IDs with the unauthorized device list, other devices are included in the unauthorized device list. Determine whether the device is an unauthorized device.
[0020]
The unauthorized device list processing unit 4 always uses the unauthorized device list held by other devices connected to the network or the unauthorized device list obtained through broadcasting, media, etc. It can be updated to something.
[0021]
The unauthorized device list processing unit 4 outputs the determined result to the unauthorized device response processing unit 5. If the result of determination by the unauthorized device list processing unit 4 indicates that there is an unauthorized device in the connected device, the unauthorized device handling processing unit 5 provides information regarding this device to the user and the manufacture of the device. The manufacturer, the manufacturer of the device that detected the unauthorized device, and the organization that manages the unauthorized device list can be notified.
[0022]
For example, when the unauthorized device handling processing unit 5 has a display unit in its own device, that is, when the presence of an unauthorized device is determined by the unauthorized device list processing unit 4 in the device b of FIG. The unauthorized device handling processing unit 5 in the device b controls the display unit 7 to display information on the unauthorized device.
[0023]
Further, when the unauthorized device handling processing unit 5 does not have a display unit in its own device, that is, when the unauthorized device list processing unit 4 in the device a of FIG. The unauthorized device handling processing unit 5 in the device a transmits information for displaying information on the unauthorized device to another device having a display unit via the IEEE1394 communication unit 2.
[0024]
Further, the unauthorized device handling processing unit 5 can also send and receive data to and from the modem. The unauthorized device handling processing unit 5 can control the modem and send information about the unauthorized device to a manufacturer of the device and an organization that manages the unauthorized device list. If there is no modem function in the device, send information about unauthorized devices to other devices that have modem functions in the network, and unauthorized devices manufacturers and organizations that manage the unauthorized device list. Information about the device may be transmitted.
[0025]
Note that when the unauthorized device handling processing unit 5 notifies the information about the unauthorized device, it may be set to wait for an instruction from the user.
[0026]
Further, when it is indicated that there is an unauthorized device in the network, the unauthorized device handling processing unit 5 stops or prohibits digital transmission of data to the unauthorized device and switches to analog data transmission. May be. That is, when the presence of an unauthorized device is indicated, the unauthorized device handling processing unit 5 controls the data processing unit 3 and the analog I / O unit 6 to convert the data from the data processing unit 3 to the analog I / O. Supply to part 6. The analog I / O unit 6 converts input data into an analog signal and transmits the analog signal to another machine via an analog transmission path.
[0027]
In addition, when it is indicated that there is an unauthorized device in the network, the unauthorized device handling processing unit 5 stops or prohibits all digital transmissions as well as data destined for the device, You may make it switch to data transmission.
[0028]
Next, the operation of the embodiment configured as described above will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing a network connection state. FIG. 3 is an explanatory diagram showing display on the display unit.
[0029]
As shown in FIG. 2, it is assumed that four devices a to d are connected via the IEEE 1394 bus 1. Of the four devices a to d, the device d is a device registered in the unauthorized device list, and the devices a and b are devices shown in FIG.
[0030]
Prior to data transmission using the network, a device on the network detects whether or not a device registered in the unauthorized device list is connected. For example, it is assumed that the device a detects an unauthorized device. The device a detects whether or not the device is registered in the unauthorized device list immediately before data transmission or when the device is connected to the network.
[0031]
For example, it is assumed that an unauthorized device is detected when a new device is connected to the network. A command for requesting a unique device number (represented by 64 bits) (ID) from the connected device when the bus reset occurs for network reconstruction or when data transmission is performed. Is transmitted onto the IEEE 1394 bus 1 via the IEEE 1394 communication unit 2. Each device receives this command via the IEEE 1394 communication unit 2 and transmits its own device number to the device a.
[0032]
The device a that has received the device number from another device connected to the IEEE 1394 bus 1 outputs the received device number to the unauthorized device list processing unit 4. The unauthorized device list processing unit 4 determines whether or not the connected device is a device corresponding to the unauthorized device list. Since the device number of the device d is registered in the unauthorized device list, the unauthorized device list processing unit 4 outputs a determination result indicating that the device d is an unauthorized device to the unauthorized device handling processing unit 5.
[0033]
The unauthorized device handling processing unit 5 includes information indicating that the device corresponding to the unauthorized device list is connected to the network, information for identifying the device, and specific instructions on how to deal with the user. Output information. The unauthorized device handling processing unit 5 outputs these pieces of information (hereinafter referred to as information on unauthorized devices) to a device having means for notifying the user. In the configuration of FIG. 1, the unauthorized device handling processing unit 5 does not have a display unit, and therefore transmits information related to the unauthorized device to another device b having a display unit via the IEEE 1394 communication unit 2.
[0034]
Information relating to the unauthorized device is taken from the IEEE 1394 communication unit 2 of the device b via the IEEE 1394 bus 1. The IEEE 1394 communication unit 2 outputs information on the unauthorized device to the unauthorized device handling unit 5 of the device b. The unauthorized device handling processing unit 5 creates display data for notifying the user of information regarding the unauthorized device based on the input information, and outputs the display data to the display unit 7. The display unit 7 displays information on unauthorized devices.
[0035]
FIG. 3 shows a display on the display unit 7 in this case.
[0036]
In FIG. 3, the configuration of the network is shown by a combination of a display 21 indicating devices and a display 22 indicating buses. Furthermore, devices corresponding to the unauthorized device list are displayed by, for example, painting or reverse display. In addition, an explanatory note is displayed in the margin part about the action to be taken by the user. The user's actions are directed to disconnecting unauthorized devices from the network and to contact a predetermined organization. Appropriate measures can be taken by displaying the contact information of the manufacturer of the device or the organization managing the unauthorized device list and asking for a countermeasure.
[0037]
By contacting the organization that manages the unauthorized device list, for example, statistical information regarding the unauthorized device can be obtained. Further, by contacting the manufacturer, there is an increased possibility that an effective coping method can be obtained when the manufacturer does not know.
[0038]
The unauthorized device handling processing unit 5 controls the IEEE 1394 communication unit 2 so as to prohibit data transmission to devices corresponding to the unauthorized device list. As a result, data transmission with the unauthorized device d becomes impossible, and unauthorized copying or the like is prevented.
[0039]
Further, the unauthorized device handling processing unit 5 indicated that the device corresponding to the unauthorized device list exists on the network can switch the data transmission from digital to analog. That is, the data processing unit 3 is controlled by the unauthorized device handling processing unit 5 and outputs the transmission data to the analog I / O unit 6. The analog I / O unit 6 transmits the input transmission data in a predetermined analog format to another device via a transmission path (not shown). Thus, when the presence of an unauthorized device is indicated, analog transmission is performed instead of digital transmission, and the copyright of the content is protected.
[0040]
As described above, in the present embodiment, when it is detected that a device corresponding to the unauthorized device list exists on the network, the user is notified of information related to the unauthorized device. In this notification, not only a display indicating an unauthorized device but also a countermeasure for the user is shown, and the user can sufficiently cope with the presence of the unauthorized device.
[0041]
FIG. 4 is a block diagram showing another embodiment of the present invention. In FIG. 4, the same components as those of FIG.
[0042]
In this embodiment, the user is not notified by displaying information on the unauthorized device, but is notified to the user by voice.
[0043]
The device c is different from the device b in that a voice guide unit 9 is provided instead of the display unit 7. The voice guide unit 9 can output voice based on the voice signal from the unauthorized device handling processing unit 5.
[0044]
Also in the embodiment configured as described above, the unauthorized device list processing unit 4 determines whether or not a device corresponding to the unauthorized device list exists on the network. The unauthorized device handling processing unit 5 is provided with the determination result of the unauthorized device list processing unit 4 and outputs information on the unauthorized device. In this case, if there is a means for outputting sound on the network, it is also possible to notify the user of information related to unauthorized devices by outputting sound.
[0045]
That is, the information on the unauthorized device is supplied from the unauthorized device handling processing unit 5 of the device a to the unauthorized device handling processing unit 5 of the device c via the IEEE 1394 communication unit 2, the IEEE 1394 bus 1, and the IEEE 1394 communication unit 2 of the device c. The The unauthorized device handling processing unit 5 converts information on the unauthorized device into an audio signal and outputs the audio signal to the audio guide unit 9. As a result, the voice guide unit 9 outputs information related to the unauthorized device by voice and notifies the user. The contents to be notified are the same as in the embodiment of FIG.
[0046]
As described above, in the present embodiment, as a method for notifying information relating to unauthorized devices, not only is visually notified to the user by the display device, but also detection of unauthorized devices and notification of countermeasures to be taken by the user are provided by voice guidance. can do.
[0047]
Further, when a device having a printing function is present on the network, information regarding an unauthorized device may be printed and notified to the user.
[0048]
In each of the above-described embodiments, the device manufacturer and the organization that manages the unauthorized device list are communicated by user operation. On the other hand, it is also possible to automate communication with these manufacturers and management organizations. That is, in this case, the unauthorized device handling processing unit 5 automatically transmits information related to the unauthorized device using a modem or the like on the network.
[0049]
FIG. 5 is an explanatory diagram showing a device configuration in this case. Of the devices a, b, f, and d connected to the IEEE 1394 bus 1, the device d is a device corresponding to the unauthorized device list, and the device f is a device equipped with a modem. In this case, the unauthorized device handling processing unit 5 of the device a that has detected that the device d is an unauthorized device transmits information on the unauthorized device to the device f. The unauthorized device handling processing unit 5 of the device f transmits the received information regarding the unauthorized device to the device manufacturer and the organization managing the unauthorized device list via the telephone line using the modem 10. The contents of transmission may include detection of an unauthorized device, the manufacturer, owner, installation location, other device information, and the like of the device.
[0050]
In addition, you may make it communicate with the organization which manages a manufacturer and an unauthorized device list | wrist using radio | wireless instead of a telephone line.
[0051]
In addition, it may be possible to transmit information on unauthorized devices to the manufacturer and the management organization only after obtaining confirmation from the user, and it is performed in accordance with user instructions without automating the transmission operation. You may do it.
[0052]
【The invention's effect】
As described above, according to the present invention, there is an effect that it is possible to allow the user to take a sufficient measure by notifying the information related to the unauthorized device connected on the network.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an unauthorized device detection apparatus according to the present invention.
FIG. 2 is an explanatory diagram for explaining a connection state of a network.
FIG. 3 is an explanatory diagram for explaining a screen display.
FIG. 4 is a block diagram showing another embodiment of the present invention.
FIG. 5 is an explanatory diagram showing another example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... IEEE1394 bus, 2 ... IEEE1394 communication part, 4 ... Unauthorized apparatus list process part, 5 ... Unauthorized apparatus response process part, 7 ... Display part.

Claims (4)

An unauthorized device list holding means for holding an unauthorized device list for identifying an unauthorized device;
Means for receiving an unauthorized device list from another device and updating the unauthorized device list held by the unauthorized device list holding means;
Detecting means for communicating with one or more devices connected on the network to detect the presence of an unauthorized device registered in the unauthorized device list;
When it is indicated that one or more devices connected to the network based on the detection result of the detection means include an unauthorized device registered in the unauthorized device list, digital transmission to the unauthorized device is performed. Means to cancel or prohibit
Means for performing analog transmission to the unauthorized device whose digital transmission has been suspended or prohibited;
When the detecting means detects that an unauthorized device is present in the device connected on the network, the device connection relationship on the network indicates which device on the network is the unauthorized device. Means for indicating by means of indicating,
An unauthorized device detection device comprising:   The unauthorized device detection apparatus according to claim 1, further comprising a unit that notifies that the unauthorized device detected by the detection unit is disconnected from the network.   The information processing apparatus further includes means for notifying the user by requesting the other apparatus connected on the network to notify the user by at least one of image display and audio output based on information on the unauthorized device. The unauthorized device detection apparatus according to claim 1. Said means for performing the notification, the unauthorized apparatus manufacturer, the at least one of the engine to manage the manufacturers and the Revocation List of equipment detects an unauthorized apparatus, automatic information for managing the Revocation 4. The unauthorized device detection device according to claim 2 , wherein notification is made manually.

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