JPH10334592A - Recording and reproducing system for transmitting information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely restrict utilization of transmitting information in simple constitution. SOLUTION: This system is equipped with a transmitting means for transmitting information of a picture, a sound and a data, etc., after adding time information to this information by a time information adder 9, a receiving means for receiving the information and time information from this transmitting means, a recording and reproducing device 4 for recording and reproducing the information and the time information received by this receiving means and a comparator 6 for comparing the present time information with the time information reproduced by the recording and reproducing device 4. When a difference between the present time information and the reproduced time information exceeds a preset restricted time of utilizing the information, a reproducing output of the recording and reproducing device 4 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a recording / reproducing method of transmission information, and more particularly to a restriction on use of an information transmission service or the like.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing a copy protection function called a serial copy management system used in a conventional digital audio tape recorder (hereinafter referred to as "DAT"). If there is no, (b) shows the case where there is a copy prohibition flag. In the figure, reference numerals 31 and 34 denote digital sources such as compact discs and satellite broadcast receivers, and 3.
2, 33, 35 and 36 are DATs. In the copy prohibition flag, 00 indicates no copy prohibition, and 10 and 11 indicate copy prohibition. FIG. 7 is a diagram showing a recording data block, where 20 is a data block, 21 is a synchronization unit, and 22 is an ID.
, 23 is a data block header, and 24 is a data part. The copy prohibition flag is written in the ID section 22.

First, when there is no copy prohibition flag shown in FIG.
Even if the information from 1 is recorded in the DAT 32, the flag is recorded as 00, and can be recorded also in the DAT 33, and the digital recording can be performed any number of times. Next, FIG.
When the copy prohibition flag of (b) is present, that is, when the flag is 11, the information from the digital source 34 is
35, the flag becomes 10, and DAT3
If the flag is set to 6, recording cannot be performed because the flag is 10. As described above, in the system shown in (b), copying can be performed only once.

In the case of computer software,
There are some which, when compared to the internal clock of the computer, become unusable at a pre-programmed time.

[0005]

Since the conventional transmission information recording / reproducing system is configured as described above, once copied data can be obtained as many times as necessary. Even if the time is limited, information can be obtained at any time by temporarily changing the internal clock.

As a method for providing information of an information provider,
There are cases where the information source itself is sold and cases where it is rented for a limited time at a cheaper price, but in the latter case, especially when transmitting information by wire or wirelessly, it is possible to leave a copy with the conventional recording and reproducing device. There was a problem that the information provider could not obtain a legitimate profit.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a transmission information recording method which enables an information provider to obtain a legitimate profit by using a powerful and low-cost use restriction technique. The reproduction method is obtained.

[0008]

According to the present invention, there is provided a transmission information recording / reproducing method, comprising: transmitting means for adding time information to information such as images, sounds, data, and the like; transmitting information and time from the transmitting means; Receiving means for receiving information, recording and reproducing means for recording and reproducing information and time information received by the receiving means, and comparing means for comparing current time information with time information reproduced by the recording and reproducing means. The comparing means stops the reproduction output of the recording / reproducing means when a difference between the current time information and the reproduced time information exceeds the information use restriction time.

Further, in the above configuration, the use time limit is set in advance in the comparing means.

[0010] In addition, the use time limit is set on the transmitting means side, and transmitted to the receiving means side.

The receiving means includes clock means which is corrected by time information transmitted from the transmitting side, and uses the time of the clock means as current time information.

When the difference between the current time information and the reproduced time information exceeds the information use time limit, the comparing means stops the reproduction output of the recording / reproducing apparatus,
It is instructed to record the non-reproducible information on the recording medium.

[0013] Further, non-reproducible information is recorded for each data block.

[0014] Further, the non-reproducible information is recorded in a predetermined location of the recording medium for each information source.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1A is a block diagram showing a transmission unit of a transmission information recording / reproducing method according to the present invention, and FIG. 1B is a block diagram showing a reception unit. In the figure, 1 is a receiving antenna, 2 is a receiver, 3 and 5 are changeover switches having contacts a and b, 4 is a recording / reproducing device, 6 is a comparator, and 7 is an output terminal. Reference numeral 8 denotes an input terminal of the transmission means, 9 denotes a time information adder, 10 denotes a transmitter, 11 denotes an amplifier, and 12 denotes a transmission antenna.

In FIG. 1, a radio wave from a transmitting means is received by an antenna 1, and tuning and demodulation are performed by a receiver 2. Here, in the case of scrambled data, decoding is also performed. The switches 3 and 5 are interlocked. First, the switches 3 and 5 are switched to the contact b, and the received information is recorded by the recording / reproducing device 4. At this time, the transmitted radio wave is added with current time information in addition to information such as images, sounds, and data by the time information adder 9 of the transmitting means.

FIG. 8 shows one unit 24 of data transmitted by the transmitter 10, 25 is a data header section, and 26 is a body section for storing the information body. Since it is necessary to receive the current time at all times, it is stored in the data header section 25, while
Scrambles and the like that require separate key information for decoding are stored only in the body part 26.

Next, when information recorded by the recording / reproducing apparatus 4 is reproduced, the switches 3 and 5 are switched to the contact point a. Information received by the antenna 1 is input to the comparator 6 through the switch 3. On the other hand, information reproduced by the recording / reproducing device 4 is input to the comparator 6 through the switch 5.

The operation of the comparator 6 will be described with reference to the flowchart of FIG. When the reproduction of the information recorded in the recording / reproducing device 4 is started (step 61), the comparator 6 acquires the current time Te added to the received information input from the switch 3 (step 62), and at the same time, The recording time Tr (the current time added at the time of recording) added to the reproduction information input from the switch 5 is obtained (step 6).
3). Next, a time difference Td = Te−Tr is obtained (step 64), and is compared with a preset use restriction time Tl (step 65) (step 66), and Tl> Td.
If so, the reproduction is continued, the current time Te is obtained (step 62), and the reproduction output is output to the output terminal 7 while repeating this operation. If the end of the recording or the stop of the reproduction by the user (step 67), the reproduction is terminated (step 69). The time difference Td is the usage limit time Tl
, Ie, if Tl> Td, the reproduction output is stopped (step 68), and the reproduction is terminated (step 6).
9). In order to search for reproducible information by a high-speed search or the like, reproduction and comparison may be continued even when reproduction output is stopped. As described above, information cannot be reproduced when the information use time limit Tl has been exceeded.

Embodiment 2 In the first embodiment, the use time limit is set in the comparator 6 as a predetermined value. In the second embodiment, however, in FIG. However, by sending a usage limit time to the receiving means with the addition of the usage limit time, the sender can freely set the usage limit time for each information.
The receiving means has the same basic configuration as that of FIG. 1 except for the operation of the comparator 6 in the first embodiment.

The operation of the comparator 6 according to the second embodiment will be described with reference to the flowchart of FIG. When the reproduction of the information recorded in the recording / reproducing device 4 is started (step 61), the comparator 6 acquires the current time Te added to the received information input from the switch 3 (step 62) and uses it at the same time. The time limit Tl is obtained (Step 70). Also, the recording time Tr (the current time added at the time of recording) added to the reproduction information input from the switch 5 is obtained (step 63). Next, the time difference Td = Te−
Tr is obtained (step 64), and the obtained usage limit time T is obtained.
1 (step 66), if Tl> Td,
The reproduction is continued, the reproduction output is output to the output terminal 7, and the current time Te is obtained (step 62). If the end of the recording or the stop by the user (step 67), the reproduction is ended (step 69). The time difference Td
Does not exceed the usage limit time Tl, that is, if Tl> Td, the reproduction output of the recording / reproduction device 4 is stopped (step 68), and the reproduction output is not output to the output terminal 7, and the reproduction is terminated. (Step 69). As described above, although the information cannot be reproduced when the use time limit Tl of the information is exceeded, the use limit time can be freely set on the transmission side in this embodiment.

Embodiment 3 FIG. In the first and second embodiments,
If the current time cannot be transmitted due to some kind of trouble, there is a use restriction that the reproduced output cannot be used at all, which is inconvenient for the user. In order to avoid this, in the third embodiment, as shown in FIG.
A clock 51 is provided between them. The clock 51 acquires the current time information as long as there is no abnormality between the transmission means and the reception means and a signal can be received from the receiver 2, and adjusts the time to the current time based on the time information. Then, the time of the clock 51 is input to the comparator 6 as the current time. Thus, even if the current time cannot be received from the transmitting means, the clock 51
It is possible to reproduce recorded information with the same usage restrictions as in the first embodiment within the error range of.

Embodiment 4 In the fourth embodiment, as shown in FIG. 5, the use of the switch 60 can be more strongly restricted by adding a switch 60 to FIG. The switch 60 also switches to the contact a or b in conjunction with the other switches 3 and 5. The operation is performed in the first or second embodiment.
If Tl> Td is not satisfied, the comparator 6 outputs non-reproducible information, which is recorded on the recording medium of the recording / reproducing apparatus 4 through the switch 60.

The operation of the comparator 6 according to the fourth embodiment will be described with reference to the flowchart of FIG. First, when the reproduction of the information of the recording / reproducing apparatus 4 is started (step 61), it is determined whether or not the non-reproducible information is recorded (step 71). The recording of the reproduction disable information will be described later.
If the reproduction disable information is recorded, the reproduction is terminated. If the reproduction disable information has not been recorded, the process is the same as that of the first embodiment up to the point where the use restriction time Tl is compared with the time difference Td (step 66). However, the current time Te may be obtained from the clock 51 in some cases. If Tl> Td, the reproduction is continued, and the reproduction is terminated at the end of recording or stopped by the user (step 67) (step 69). Tl> T
If it is not d, the reproduction is continued while writing the non-reproducible information on the recording medium (step 72), and the process returns to the acquisition of the current time Te (step 62) and repeats. If the end of the recording or a stop command from the user is issued, the reproduction is terminated.

The recording position of the non-reproducible information may be, for example, in the ID section 22 of the data block 20 in FIG. FIG. 8 shows the internal structure of the transmission data and the internal structure of the data section 24 in the data block 20. The received time information read from the recording / reproducing device 4 is recorded in the data header 25. It is not possible to coincide with the ID section 22, which is the recording position of the unacceptable information, on the time axis.
Therefore, even in a recording / reproducing apparatus such as a magnetic tape recording / reproducing apparatus which cannot record / reproduce at the same time, by switching between recording and reproducing, it is possible to record the non-reproducible information while reproducing.

As a result, the content can be reproduced once even after the usage time limit has passed, but cannot be reproduced for the second time or later. In particular, when random access is difficult as in a tape medium, for example, in a recording / reproducing apparatus that performs tape recording by a helical scan method, since recording is performed diagonally on the medium, countless discontinuous recording tracks are formed. If a data block is allocated to one track, the record disable information is written to all tracks, so that the reproduction can be restricted immediately regardless of where it is reproduced.

Embodiment 5 FIG. In the fourth embodiment, the recording location of the non-reproducible information is for each recording block. However, in a system capable of random access, one location may be provided for one information source. When the reproduction is performed after the usage time limit, the non-reproducible information is recorded at a predetermined location on the medium for each information source. At the time of reproduction, by always confirming the non-reproducible information, it is possible to restrict the use of the non-reproducible information without missing even in a special use state such as a high-speed search.

Embodiment 6 FIG. In the above embodiment, when the reproduction is interrupted and terminated, if there is a display device, it is displayed that the reproduction cannot be performed due to the use restriction. Also, in a device that can output voice, the display may be performed by voice.

[0029]

Since the present invention is configured as described above, it has the following effects. In other words, the transmitting means only needs to add time information, and the receiving means only compares the recording time with the current time and determines that reproduction is impossible. Have a legitimate interest.

Further, by transmitting the use time limit, the information provider can freely set the use time limit according to the content and value of the information.

Also, a clock is provided, and the clock is adjusted to the current time according to the received time information, so that even if some trouble occurs between transmission and reception, information including usage restrictions can be used.

Further, by recording the non-reproducible information, the use can be restricted even in a special use state such as a high-speed search.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording / reproducing method of transmission information according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart illustrating the operation of the first embodiment.

FIG. 3 is a flowchart illustrating an operation of a transmission information recording / reproducing method according to Embodiment 2 of the present invention.

FIG. 4 is a block diagram showing a recording / reproducing method of transmission information according to Embodiment 3 of the present invention.

FIG. 5 is a block diagram showing a recording / reproducing method of transmission information according to Embodiment 4 of the present invention.

FIG. 6 is a flowchart illustrating the operation of the fourth embodiment.

FIG. 7 is a diagram showing a recording data block.

FIG. 8 is a diagram showing a configuration of transmission data.

FIG. 9 is a diagram illustrating a conventional copy guard system.

[Explanation of symbols]

Reference Signs List 1 antenna, 2 receiver, 3 and 5 changeover switch, 4 recording and reproducing device, 6 comparator, 7 output terminal, 9
Time information adder, 10 transmitter, 12 transmitting antenna, 51 clock.

Claims (7)

[Claims] 1. A transmitting means for adding time information to information such as an image, a sound, and data, and transmitting the information; a receiving means for receiving information and time information from the transmitting means; Recording / reproducing means for recording / reproducing time information, and comparing means for comparing current time information with time information reproduced by the recording / reproducing means, wherein the comparing means comprises current time information and time reproduced When the difference from the information exceeds the information usage time limit, the reproduction output of the recording / reproduction means is stopped. 2. The recording / reproducing method for transmission information according to claim 1, wherein the use time limit is set in advance in the comparing means. 3. The use time limit is set on the transmission means side,
2. The recording / reproducing method for transmission information according to claim 1, wherein the transmission information is transmitted to a receiving means. 4. The receiver according to claim 1, further comprising clock means for correcting the time based on the time information transmitted from the transmitting side, and using the time of the clock means as current time information.
4. A recording / reproducing method for transmission information according to claim 3. 5. When the difference between the current time information and the reproduced time information exceeds the information use restriction time, the comparing means stops the reproduction output of the recording / reproducing apparatus,
5. The recording / reproducing method for transmission information according to claim 1, wherein an instruction is issued to record the non-reproducible information on a recording medium. 6. The non-reproducible information is recorded for each data block.
Recording / reproducing method of the described transmission information. 7. The recording / reproducing system for transmission information according to claim 5, wherein the non-reproducible information is recorded at a predetermined location on a recording medium for each information source.