JP2639222B2 - Protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device, in particular, a screen display device (Cathode Ray Tube or less).
Red Green Blue (Red Green) given to CRT
The present invention relates to a protection device that is installed on a signal interface to change the RGB signal so that screen information cannot be seen.

[0002] In addition, the present invention particularly relates to a protection device which is installed on a keyboard interface to invalidate key input.

At present, when providing application software for a personal computer to the market, a protection device for protecting software may be added.

For example, by using a connector of the RS232C (serial data) interface of the JISC6361 standard attached to a personal computer, a command is output to a communication port, and a data response based on predetermined information is obtained so that software can be obtained. Has been invented.

[0005]

2. Description of the Related Art A conventional protector will be described with reference to the drawings.

FIG. 5 is a block diagram of a conventional protection device, and FIG. 6 is a flowchart showing the operation of the protection device shown in FIG.

In FIG. 5, a protection device of a conventional example includes a command decoder section 5 and a status signal output section 6.
It is composed of

First, the protector applies a protect command f or RS to the transmission serial data input terminal SD1.
The 232C data signal i is taken.

The command decoder 5 determines whether the command is normal data or a protect command. When the command is a protect command, the command decoder 5 supplies a command reception signal g to the status signal output unit 6.

[0010] The status signal output section 6 outputs a status signal h to the reception serial data output terminal RD1 based on predetermined information.

A normal RS232C data signal i taken into the protector is output from a transmission serial data output terminal SD2. Then, necessary processing is performed, and input is performed from the transmission serial data input terminal RD2 and output from the reception serial data output terminal RD1.

Here, the operation of the conventional protection device will be described in detail with reference to FIG.

First, when the software is started, FIG.
The protection command is output on the premise that the protection device is connected to the RS232C interface (step 31).

Next, it is monitored whether or not there is a response to the status signal h from the protector (step 32). If there is no response (step 32, No) or if the status signal h which has responded is incorrect (step 32). Step 33,
No), the software is stopped without starting (step 35).

When the status signal h is correct (step 33, Yes), the software is activated assuming that the protection device has responded normally (step 34).

In this way, the software is protected.

[0017]

In the above-mentioned conventional protection device, since a command for protection is put on the serial data of the RS232C interface together with the data signal, the code set in the command is RS232C.
The device connected to the C interface is limited in that it cannot be used as data or control codes. In addition, since a command is also input together with data, measures must be taken to prevent malfunction due to the command, and usage is restricted. There are drawbacks.

It is an object of the present invention to provide a CRT RG instead of using a conventional RS232C interface connector.
It is an object of the present invention to provide a protection device that processes the B signal and invalidates the key reset signal of the keyboard to solve the above-mentioned drawbacks and that does not limit the communication data by the RS232C at all.

[0019]

According to a first aspect of the present invention, there is provided a protector for receiving an RGB signal for controlling a CRT, processing the signal, transmitting the signal to a CRT, and an RGB interface for processing the RGB signal. Processing signal generating means for generating a processing signal.

A protector according to a second aspect of the present invention includes a keyboard interface unit for inputting a key reset signal for stopping a key input of the keyboard, turning the signal on / off by a gate, and transmitting the signal,
Invalid signal generating means for generating a key reset invalid signal for N / OFF.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a protection device according to an embodiment of the first invention, and FIG. 2 is a flowchart showing a protection process when the protection device shown in FIG. 1 is used.

In FIG. 1, the protector of the present embodiment receives an RGB signal b for controlling a CRT, processes this signal, and then transmits the signal to the CRT, and a processing for processing the RGB signal b. The RGB interface unit 1 includes an RGB signal processing unit 1a.

The RGB signal b is input to the RGB interface unit 1 and then output from the processing signal
The signal is processed by the RGB signal processing means 1a according to the GB processing signal a, and is output to the CRT with a logic different from that of the original RGB signal b.

Here, the operation of the software using the protection device shown in FIG. 1 and the manner of changing the RGB signals will be described in detail with reference to FIG.

First, RGB signal information to be output to a CRT from a higher-level device, for example, a personal computer, is changed in advance so that it is difficult for a human to see, and is output as an RGB signal b (step 11).

At this time, if there is the protector of this embodiment, the processing signal generator 2 of the protector outputs an RGB processed signal a for returning the changed information to the original (step 12).

Then, in the RGB signal processing means 1a of the RGB interface 1 of the protection device, the RGB signal b is rewritten to normal RGB signal information by the RGB processing signal a generated from the processing signal generating means 2 (step 1).
3).

In the case without a protection device, RG
The B signal information is in a state where it is difficult for a human to see.

As described above, the RGB signal information is output as the RGB signal b from the host device, the RGB signal b that has passed through the protect device becomes the normal RGB signal information, and the RGB signal b that does not pass is difficult for humans to see. Is output to the CRT with the changes (step 1
4).

By using the RGB signal b thus rewritten, the CRT display becomes invisible normally, and the display becomes visible only when the protection device is used.

Next, an embodiment of the second invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of a protection device according to an embodiment of the second invention, and FIG. 4 is a flowchart showing a protection process when the protection device shown in FIG. 3 is used.

The protector shown in FIG. 3 receives a key reset signal c for stopping a key input, and turns on / off and transmits the signal via the signal gate. A key reset for turning the key reset signal c on / off is provided. And invalid signal generating means 4 for generating an invalid signal d.

When the protection processing is not performed, the key reset signal c input from the key reset signal input terminal P1 is not restricted at all by the gate taken into the keyboard interface unit 3, and the key reset signal output terminal P3 is not changed. Is output to the keyboard (KB),
Although the key input is stopped, in the case of the protection processing, the key reset signal c is taken into the keyboard interface unit 3 and then invalidated by the key reset invalid signal d output from the invalid signal generating means 4 at the gate. Is input to the key input signal input terminal P4, and the key input signal e is input to the key input signal output terminal P2.

Here, the operation of the software using the protection device shown in FIG. 3 will be described in detail with reference to FIG.

First, when a key reset invalid signal is input from the key reset invalid signal input terminal OUT by the invalid signal generating means 4, a key reset invalid signal d is output (step 21). The key reset signal c input from the key reset signal input terminal P1 of the keyboard interface unit 3 is directly output from the key reset signal output terminal P3 if there is no key reset invalid signal d by the gate. If there is, it is not output from the key reset signal output terminal P3 (step 2
2).

As described above, the key reset signal c is always supplied from the host device to the keyboard, and the key reset invalid signal d is output each time. Accordingly, if the protection device is provided, the key reset signal c is invalidated by the key reset invalid signal d, and the key input is enabled, and the key input signal e is output to the key input signal output terminal P2 as described above. . Further, when the protection device is not provided, the key reset invalid signal d does not work, and the key reset signal c is output, so that key input cannot be performed.

Table 1 shows the relationship between the signal logic value (0 or 1) of the key reset signal c and the key reset invalid signal d, whether key input is enabled (unprotected) or not (protected).

[0040]

[0041]

As described above, the protector according to the first aspect of the present invention processes the RGB signal of the CRT in place of using the conventional RS232C port, thereby providing the RS.
There is an effect that communication data by 232C is not restricted at all.

Further, the protector according to the second invention invalidates the key reset signal of the keyboard instead of using the conventional RS232C port, thereby providing the RS23.
There is an effect that communication data by 2C is not restricted at all.

[Brief description of the drawings]

FIG. 1 is a block diagram of a protection device according to an embodiment of the first invention.

FIG. 2 is a flowchart showing a protection process when the protection device shown in FIG. 1 is used.

FIG. 3 is a block diagram of a protection device according to an embodiment of the second invention.

4 is a flowchart showing a protection process when the protection device shown in FIG. 3 is used.

FIG. 5 is a block diagram of a conventional protection device.

FIG. 6 is a flowchart showing an operation of the protection device shown in FIG. 5;

[Description of Signs] 1 RGB interface unit 1a RGB signal processing unit 2 processing signal generation unit 3 keyboard interface unit 4 invalid signal generation unit 5 command decoder unit 6 status signal output unit SD1 input port RD1 output port a red green blue (RGB) Processing signal b Red green blue (RGB) signal c Key reset signal d Key reset invalid signal e Key input signal f Protect command g Command reception signal h Status signal i RS232C output data

Claims (2)

(57) [Claims] 1. A red-green-blue interface unit for inputting a red-green-blue signal for controlling a screen display device, processing the signal, and transmitting the processed signal to the screen display device, and a red-green-blue interface processing the red-green-blue signal. A protection signal generating means for generating a processing signal. 2. A key reset signal for stopping a key input of a keyboard is inputted, and the signal is turned on / off by a gate.
A protection device comprising: a keyboard interface unit for transmitting the key reset signal; and an invalid signal generating means for generating a key reset invalid signal for turning on / off the key reset signal.