JPH05257578A - Protect device - Google Patents

Abstract

PURPOSE:To provide the protect device providing no restrict on the output data of RS 232C. CONSTITUTION:The system is provided with a light receiving means 1 receiving a screen display light (a) of a screen display device detecting the presence or absence of the display light and generating a light detection signal (b), a key reset invalid signal generation means 2 connected to the light receiving means 1, inputting the light detection signal (b) and generating a key reset invalid signal (c), and a keyboard interface section 3 connected to the key reset invalid signal generation means 2, inputting the key reset invalid signal (c) and turning on and off the key reset signal.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a protection device.

[0002]

2. Description of the Related Art When providing application software for a personal computer to the market, a protect device for protecting the software is sometimes added. For example, a protect device was invented that uses a JISC6361 standard RS232C interface connector attached to a personal computer, outputs a command to a communication port, and obtains a data response based on predetermined information to activate software. ing.

A conventional protect device includes a command decoder section and a status signal output section. Next, a conventional protector will be described in detail with reference to the drawings. FIG. 5 is a block diagram showing a conventional example. The protect device shown in FIG. 5 applies the protect command g or R to the transmission serial data input terminal SD1.
The S232C data signal h is fetched. The command decoder 6 determines whether it is normal data or a protect command, and when it is a command, gives a command reception signal i to the status signal output unit 7. The status signal output unit 7 outputs a status signal j based on predetermined information to the reception serial data output terminal RD1.

FIG. 6 is a flowchart showing the operation of the protect device shown in FIG. First, when the software is activated, the protect command is output on the assumption that the protect device of FIG. 5 is connected to the RS232C interface (step 21). Next, monitor whether there is a response from the status signal (step 22),
If there is no response (No in step 22) or if the responded status signal is incorrect, the software does not start (No in step 23). If the status signal is correct, it is determined that the protection device has responded properly, and the software is activated (step 23 Ye
s). In this way the software is protected.

[0005]

However, in the above-described conventional protector described above, since the protect command is input to the RS232C port together with the data signal from the same terminal, the code set in the command is the RS232C interface. There is a restriction that it cannot be used as data or control code on the device side connected to, and because a command is also input with the data, it is necessary to take measures to prevent malfunctions due to commands and there is a drawback that it is restricted. ..

[0006]

According to a first aspect of the present invention, there is provided a protector, which receives a screen display light of a screen display device, detects a presence or absence of the display light, and generates a light presence / absence detection signal, and the light receiving means. Connected to the key reset invalid signal generating means for generating a key reset invalid signal by inputting a light presence signal, and the key reset invalid signal connected to the key reset invalid signal generating means for inputting the key reset invalid signal.
It is configured to include a keyboard interface unit that turns on / off.

The protector according to the second aspect of the present invention includes a light receiving means for receiving the screen display light of the screen display device and detecting the presence / absence of the display light to generate a light presence / absence detection signal, and a light presence / absence detection connected to the light receiving means. A switching control signal generating means for inputting a signal and generating a switching control signal, a switch driving means connected to the switching control signal generating means for generating a switch driving signal, and a switch driving signal connected to the switch driving signal generating means. It is configured to include a changeover switch to be driven and a serial data interface unit having a structure in which a transmission data input terminal and a reception data output terminal are connected to each other by the changeover switch.

[0008]

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. The protector shown in FIG. 1 receives the screen display light a of the screen display device and detects the presence / absence of the display light to generate a light presence / absence detection signal b, and a light presence / absence signal b connected to the light reception means 1. Key reset invalid signal generating means 2 for inputting the key reset invalid signal c and a keyboard interface unit 3 connected to the key reset invalid signal generating means 2 for inputting the key reset invalid signal c and turning the key reset signal ON / OFF. It is configured to include and.

The light receiving means 1 inputs and converts the screen display light a and outputs a light presence / absence detection signal b depending on the presence or absence of the screen display light. The key reset invalid signal generating means 2 receives the light presence signal b and outputs the key reset invalid signal c. The key reset invalid signal C is input to the keyboard interface unit 3 and operates to invalidate the key reset signal.

FIG. 2 is a flow chart showing a protect process when the protect device shown in FIG. 1 is used. When the program is activated, a key reset signal is first output (step 11). Next, display is performed at a designated position on the screen in a display form in which the light receiving means 1 can detect light (step 12). At this time, the light receiving means 1 is set at a designated position of the screen display device so that the screen display light can be detected. Next, if there is no protect device, there is no means for invalidating the key reset signal, so that key input is impossible. (Step 12 without device). If there is a protect device, the light receiving means 1 detects the light from the screen display device (step 13), and the key reset invalid signal generating means 2 is generated.
Generates a key reset invalid signal c (step 1
4). The key reset invalidation signal c is input to the keyboard interface unit to invalidate the key resetting signal output in step 11 (step 15).

By detecting the display light of the screen display device in this way, the key reset signal can be invalidated when the protect device is used, and the key input becomes possible. In this protection device, a key reset signal is always applied to the keyboard, but an invalid signal is output each time. Therefore, if the protect device is provided, the key reset signal becomes invalid and key input is possible, but if the protect device is not provided, key input is not possible.

FIG. 3 is a block diagram showing a second embodiment of the present invention. The protector shown in FIG. 3 receives the screen display light aa of the screen display device and detects the presence / absence of the display light to generate a light presence / absence detection signal bb, and a light presence / absence detection signal connected to the light reception means 11. Switching control signal generating means 22 for inputting bb and generating switching control signal cc, and switch drive signal dd connected to switching control signal generating means 22.
A switch drive means 33 for generating a signal, a changeover switch 44 connected to the switch drive signal generation means 33 and driven by a switch drive signal dd, and a changeover switch 44 for transmitting data input terminal SD1 and receive data output terminal RD.
1 and a serial data interface unit 55 having a structure in which they are connected to each other.

The light receiving means 11 inputs and converts the screen display light aa and outputs a light presence / absence detection signal bb depending on the presence or absence of the screen display light. The switching control signal generating means 22 receives the light presence / absence detection signal bb and outputs a switching control signal cc. The switch driving means 33 inputs the switching control signal cc and outputs a switch driving signal dd for driving the switch 4. The changeover switch 44 inputs the switch drive signal dd, connects the transmission serial data input terminal SD1 and the reception serial data output terminal RD1 of the serial data interface unit to each other, and when serial data is output, the same data is folded back as reception data. Operate.

The internal connection of the serial data interface section 55 will now be described. Normally, the transmission serial data input terminal SD1 and the transmission serial data output terminal SD2 are provided.
And the reception serial data output terminal RD1 and the reception serial data input terminal RD2 are connected. The changeover switch 44 separates between the transmission serial data input terminal SD1 and the transmission serial data output terminal SD2 and between the reception serial data output terminal RD1 and the reception serial data input terminal RD2 when the drive signal becomes valid and the changeover switch is driven. , Transmission serial data input terminal S
The D1 and the reception serial data output terminal RD1 are connected to each other so that when the serial data is output, the data as it is is returned as reception data.

FIG. 4 is a flow chart showing a protect process when the protect device shown in FIG. 3 is used. When the program is activated, first, the light receiving means 1 displays the light at a designated position on the screen in a display form capable of detecting light (step 110). At this time, the light receiving means 11 is set at a designated position of the screen display device so that the screen display light can be detected. Next, if there is a protect device, the light receiving means 11 detects light from the screen display device (step 120).
Then, the switching control signal generating means 22 generates the switching control signal cc, and the switch driving means 33 generates the switch driving signal dd (step 130). The changeover switch is driven by the drive signal and connects the inside of the serial data interface unit so as to return the serial data (step 140). Next, the serial data is transmitted and the serial data is immediately received (step 150). If the received serial data and the transmitted serial data match (Yes in step 160), the program is normally started assuming that there is a protect device.

If the received serial data and the transmitted serial data do not match (step 160)
No) Stop the program assuming there is no protect device.

In this way, the presence or absence of the protection device can be confirmed by detecting the display light of the screen display device and directly receiving the serial data transmitted by switching the switch. Therefore, the software can be activated if the protect device is provided, and the software can be stopped if the protect device is not provided.

[0019]

The protection device of the present invention is RS232.
By invalidating the key reset signal of the keyboard instead of using the C port, the effect that the communication data by RS232C is not limited at all can be obtained.

Further, the protection device of the present invention is RS2.
By installing on the 32C interface and switching the data terminal with a switch, the presence or absence of the protect device can be confirmed, and the effect that the communication data by RS232C is not limited at all can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing a protect process of the first embodiment.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a flowchart showing a protect process of a second embodiment.

FIG. 5 is a block diagram showing a conventional example.

FIG. 6 is a flowchart showing the operation of a conventional protect device.

[Explanation of symbols]

 1 light receiving means 2 key reset invalid signal generating means 3 keyboard interface 6 command decoder 7 status signal output section

Claims (2)

[Claims] 1. A light receiving means for receiving the screen display light of a screen display device and detecting the presence / absence of the display light to generate a light presence / absence detection signal, and a light reset signal connected to the light receiving means to input a light presence / absence signal. And a keyboard interface section connected to the key reset invalid signal generating means for inputting the key reset invalid signal and turning on / off the key reset signal. .. 2. A light receiving means for receiving the screen display light of the screen display device and detecting the presence / absence of the display light to generate a light presence / absence detection signal, and a light presence / absence detection signal connected to the light receiving means for inputting a switching control signal. A switch control signal generating means, a switch drive means connected to the switch control signal generating means for generating a switch drive signal, a changeover switch connected to the switch drive signal generating means and driven by a switch drive signal, A protector comprising a serial data interface unit having a structure in which a transmission data input terminal and a reception data output terminal are connected to each other by a changeover switch.