JP2020191588A - Playback device, playback method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously reproduce video data even if there is video data which cannot be read normally due to being set in a locked state, and to stop continuous reproduction when the video data is destroyed. To do so. SOLUTION: A reproducibility determination unit for determining whether the video data read from a recording medium is reproducible video data, and determining whether the video data determined to be non-reproducible is the video data to be locked. It has a protected video determination unit and a video reproduction unit that controls the reproduction of the video data, and the video reproduction unit receives the video data determined to be impossible to reproduce when the video data is continuously reproduced. If it is determined that the data is locked, the substitute data is reproduced instead of the video data, and if it is determined that the data is not locked, the video data and the alternative data are not reproduced. [Selection diagram] Fig. 1

Description

The present invention relates to a reproduction device, a reproduction method, and a program.

In a video recording / playback device such as a video camera, video data is recorded on a recording medium such as a portable memory card. Therefore, there is a risk that the video data may be leaked to the outside due to the loss or theft of the recording medium. As a countermeasure against the outflow of video data, a technique for invalidating data reading from a recording medium by setting the recording medium in a locked state has attracted attention (Patent Document 1).

The security lock of the recording medium to which this technology is applied is set or released by, for example, the user using NFC (Near Field Communication) built in the smartphone and the installed software. The recording medium set in the locked state can normally read the newly written video data as long as it is connected to the imaging device and mounted until it is unmounted. However, when the recording medium is unmounted from the imaging device, the value of 0xFF is always output when reading the video data written earlier, and the video data cannot be read normally until the locked state is released.

Video data that cannot be normally read from the recording medium cannot be normally displayed on the display device. As a countermeasure against this, there is known a technique of not displaying a video when the format of the read video data is uninterpretable (Patent Document 2). According to such a technique, the video data recorded on the recording medium set in the locked state can be processed so as not to be displayed by the playback device.

Japanese Unexamined Patent Publication No. 2017-146989 Japanese Unexamined Patent Publication No. 2008-2586999

There is a playback device having a slide show function for continuously playing back a plurality of video data recorded on a recording medium or the like. In a playback device having a slide show function, if the video data is destroyed due to failure to save the video data on a recording medium or the like, continuous playback of the video data is stopped in order to notify the user to that effect. Some playback devices have a function. Here, for example, when the video data recorded on the recording medium set in the locked state is continuously reproduced, the video data that cannot be normally read from the recording medium is recognized as the destroyed video data. As a result, it is conceivable that the continuous playback operation may be stopped by the video data that is only protected for security and is not damaged.

Further, according to the technique described in Patent Document 2, even if the video data cannot be read normally due to being set in the locked state or the video data is broken, the video data is not reproduced in the same manner. become. In this case, even if there is destroyed video data, it is not possible to notify the user to that effect.

The present invention has been made in view of such circumstances, and is a case where continuous playback is continued even if there is video data that cannot be read normally due to being set in the locked state, and the video data is destroyed. The purpose is to be able to stop continuous playback.

According to the playback device according to the present invention, reproduction is impossible by the first determination means for determining whether or not the video data read from the recording medium is reproducible video data, and the first determination means. When the second determination means for determining whether or not the determined video data is the video data to be locked in the recording medium and the plurality of video data recorded in the recording medium are continuously reproduced. With respect to the video data determined to be unreproducible by the first determination means, when the second determination means determines that the video data is the lock target, the substitute data is reproduced instead of the video data. However, it is characterized by having a control means for controlling not to reproduce the video data and the alternative data when it is determined by the second determination means that the data is not the lock target.

According to the present invention, even if there is video data that cannot be read normally from the recording medium, if the video data cannot be read normally because it is set to the locked state, continuous playback is continued and the video data is destroyed. In the case of video data, continuous playback can be stopped.

It is a figure which shows the structural example of the reproduction apparatus in embodiment of this invention. It is a figure explaining the operation example of the reproduction apparatus in 1st Embodiment. It is a figure which shows the example of the format of video data. It is a flowchart which shows the operation example of the reproduction apparatus in 1st Embodiment. It is a figure explaining the operation example of the reproduction apparatus in 2nd Embodiment. It is a flowchart which shows the operation example of the reproduction apparatus in 2nd Embodiment. It is a figure which shows the computer function which can realize the reproduction apparatus in this embodiment.

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

(First Embodiment)
The first embodiment of the present invention will be described.
FIG. 1 is a block diagram showing a configuration example of the reproduction device 100 according to the embodiment of the present invention. The playback device 100 in the present embodiment includes a drive unit 102, a read control unit 103, a memory 104, a playback enable / fail determination unit 105, a video reproduction unit 106, a display unit 107, a protected video determination unit 108, and an alternative video generation unit 109.

The playback device 100 reproduces the video data recorded on the recording medium 100. The playback device 100 has a function of continuously playing back a plurality of video data recorded on the recording medium 100, like a so-called slide show function. In the first embodiment, when the playback device 100 continuously reproduces a plurality of video data recorded on the recording medium 100 and the normal video data cannot be read from the recording medium 100, the playback device 100 operates as follows. To do. When the playback device 100 is set to the locked state and the video data cannot be read normally, the playback device 100 displays the number (number of cases) of the video data, continues continuous playback of the video data, and is destroyed. If it is video data, continuous playback of the video data is stopped.

For example, it is assumed that the video data of the read video group 200 as shown in FIG. 2A is recorded on the recording medium 100. The read-out video group 200 includes videos 1 to 5, which are video data that can be read normally. Further, the read video group 200 includes locks 1 to 9, which are video data that cannot be read because they are locked targets, and destroyed data (destroy data) that cannot be read normally due to destruction of the data format or the like. .. As shown by the arrows in FIG. 2A, the video data includes video 1, lock 1, lock 2, lock 3, lock 4, lock 5, lock 6, lock 7, lock 8, lock 9, video 2, and video. It is assumed that the reading is performed in the order of 3. destruction data, video 4, and video 5.

Here, for example, in a playback device that stops continuous playback of video data when normal video data cannot be read from the recording medium, the video data of lock 1 cannot be read after the video 1 is played, so that the video data is continuously played there. Playback stops. Since the video data of lock 1 is video data that cannot be read normally because it is set to the locked state and is not destroyed video data, it is not desirable to stop continuous playback of the video data. is there.

Further, for example, in a playback device that does not display a video when normal video data cannot be read from the recording medium, video 1, video 2, video 3, video 4, and video 5 that can read normal video data from the recording medium. It is played continuously in order. In this case, since the continuous reproduction of the video data is not stopped by the destruction data, it is not possible to realize the user notification for recognizing the existence of the destruction data even though the destruction data is included.

On the other hand, in the playback device 100 according to the first embodiment, as shown in FIG. 2B as an example of the playback image 201, the video 1, the alternative video 202, the video 2, and the video 3 are displayed in this order. , Since the destruction data cannot be read, continuous playback is stopped there. The alternative video 202 has a function of indicating the number (number of cases) of video data that cannot be read because it is locked between the video 1 and the video 2, and in this example, it is displayed that the number of locks is 9. doing.

As described above, when the video data cannot be read normally, the playback device 100 in the first embodiment cannot read the video data because it is a lock target or because it is destroyed data. Is determined and the playback method is switched. Then, when the video data is set to the locked state and cannot be read normally, the playback device 100 displays the number (number of cases) of the locked target and continues the continuous playback of the video data. If the video data is destroyed, the continuous playback of the video data is stopped.

Returning to FIG. 1, video data is recorded on the recording medium 101. The drive unit 102 acquires video data from the recording medium 101, and the read control unit 103 decodes the video data acquired by the drive unit 102. The decoded video data is stored in the memory 104. The playability determination unit 105 analyzes the video data stored in the memory 104. The reproducibility determination unit 105 determines whether or not the video data stored in the memory 104 is correctly reproducible video data. Since the method of determining whether the video data can be reproduced correctly is realized by various techniques, any technique may be used.

For example, if the video data is not configured according to a predetermined format, the playability determination unit 105 determines that the video data cannot be reproduced. There are various formats of video data, and FIG. 3 shows an example. In the format 300 illustrated in FIG. 3, the video data has a header 310, moving image data 320, audio data 330, and a checksum 340.

The header 310 has a header size 311, version information 312, thumbnail data 313, and other data 314 such as data size. The other data 314 includes, for example, the sizes of the moving image data 320 and the audio data 330, their offset addresses, and the like. The moving image data 320 is actual video information, and it is possible to acquire the starting address in the memory of the area where the moving image data is recorded from the offset address value from the beginning of the header. Similarly, the voice data 330 can also acquire the start address in the memory of the area where the voice data is recorded from the offset address value from the beginning of the header. The checksum 340 stores the checksum value of the entire data calculated at the time of recording the video data, and the data consistency can be determined by recalculating at the time of reading the video data.

Whether or not the video data can be reproduced correctly can be determined by the presence or absence of an abnormality in such a format. In the present embodiment, for example, a method of determining whether the head data of the moving image data and the audio data exists in various offset portions, a method of determining whether the checksum calculation result is correct, and determining whether the header size is correct. Use the method. Using these methods, the reproducibility determination unit 105 determines whether or not the video data is read according to a predetermined format. Here, since there are generally various formats and determination methods, any method may be used.

When the reproducibility determination unit 105 determines that the video data can be reproduced correctly, the video data is reproduced by the video reproduction unit 106 and displayed on the display unit 107. On the other hand, when the reproducibility determination unit 105 determines that the video data cannot be reproduced, the protection image determination unit 108 may or may not be able to read the video data normally because the video data is set to the locked state. Is determined.

Here, when the recording medium is set to the security mode, it is possible to write data, but there are some restrictions on reading the saved data. When the security card is locked with the security mode set, it is possible to read the recorded data from the time the power is turned on to the time it is turned off, but it is already saved on the security card before the power is turned on. The data that was being used cannot be read. Specifically, the security card can perform the process of reading data, but under the control of the controller of the security card, all the data recorded in the data recording area of the recording medium is read out as data of 0xFF. The security card (recording medium) has a data recording area and a management information recording area. For image content whose reading is restricted on the recording medium, the data in the data recording area is read at 0xFF, but the system information (FAT, directory entry, etc.) recorded in the management information recording area can be read as usual. it can. That is, even when the security card is locked, it cannot read information about the file recorded on the security card (file name, file attribute, file size, modification date, creation date, data recording position, etc.). it can. When reading the video data that is read-restricted, that is, that is set in the locked state, the video data cannot be read correctly because it is read with the data of 0xFF as described above. In the recording medium of the present embodiment, when the video data set in the locked state is read, all 0xFF data is read out, but the present invention is also applicable to a recording medium in which all 0x00 data is read out. .. Further, for example, the present invention can be applied to a recording medium in which data of fixed patterns of 0x55 and 0xAA are repeatedly read out from video data set in a locked state.

Therefore, in the present embodiment, the protected video determination unit 108 determines that the video data cannot be reproduced by the reproduction enablement determination unit 105 based on the determination conditions shown in (1) and (2) below, for example. Determines whether or not the video data is set to the locked state.
(1) All the same data such as 0xFF and 0x00 are continuously read out by a certain amount or more.
(2) Fixed pattern data is repeatedly read out by a certain amount or more like a pattern in which 0x55 and 0xAA are alternately continuous.
When any of these patterns is applied, the protected video determination unit 408 determines that the video data is the lock target that could not be read normally because it is set to the locked state.

When it is determined that the video data determined to be unplayable is the video data to be locked, the video is not played back, and the playback device 100 starts counting the number of video data to be locked. .. Then, after the start of counting, when the video data determined to be correctly playable is read out, the counting of the number of consecutive video data to be locked in a predetermined order of the plurality of video data is stopped. The alternative video generation unit 109 generates alternative data that can display the number of video data to be locked (number of locks) based on the counted number of video data. The video reproduction unit 106 reproduces alternative data capable of displaying the number of locks, and then reproduces the video data determined to be correctly reproducible.

For example, in the case of the read video group 200 shown in FIG. 2A, the video data of locks 1 to 9 is continuously determined to be the video data to be locked, and the video data is not reproduced during that time. When the video data of the video 2 is read out, the playback device 100 stops counting the number of video data to be locked, and the alternative video generation unit 109 stops counting the number of video data to be locked, and as illustrated as the alternative video 202, the number of video data to be locked Generate alternative data that can display (number of locks). The video reproduction unit 106 reproduces the video 2 after reproducing the alternative data capable of displaying the number of locks. After that, the playback device 100 continues the continuous playback operation, and as shown as the playback image 201 in FIG. 2B, the playback device 100 sequentially reproduces the video 3 and then reads the destruction data. Stop the operation.

Next, the operation of the reproduction device 100 in the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an example of continuous reproduction processing of video data in the reproduction device 100 according to the first embodiment.

When the continuous playback process is started, in step S401, the playback device 100 initializes the lock counter variable indicating the number of video data to be locked (the number of locks) to 0. In step S402, the reproduction device 100 searches the recording medium 101 for the video data to be reproduced next. Next, in step S403, the reproduction device 100 determines whether or not there is video data to be reproduced next. As a result of the determination, if it is determined that there is video data to be reproduced next (YES), the process proceeds to step S404, and if it is determined that there is no video data to be reproduced next (NO), the continuous reproduction process is terminated.

In step S404, the reproducibility determination unit 105 of the reproduction device 100 determines whether or not the video data is correctly reproducible video data as described above. When the reproduction possibility determination unit 105 determines that the video data cannot be reproduced (NO), the process proceeds to step S405, and when the reproduction possibility determination unit 105 determines that the video data can be reproduced (YES). ), The process proceeds to step S407.

In step S405, the protected video determination unit 108 of the playback device 100 determines whether or not the video data is the video data to be locked as described above. When the protected video determination unit 108 determines that the video data is the video data to be locked (YES), the process proceeds to step S406. On the other hand, when the protected video determination unit 108 determines that the video data is not the video data to be locked (NO), it is regarded as the destroyed video data and the continuous playback process is terminated.

In step S406, the reproduction device 100 increments the lock counter variable by one, and the process returns to step S402.

In step S407, which proceeds when it is determined in step S404 that the video data can be reproduced, the reproduction device 100 confirms the value of the lock counter variable. If the value of the lock counter variable is 0 (YES), the process proceeds to step S408, and if the value of the lock counter variable is not 0 (NO), the process proceeds to step S410.

In step S408, the reproduction device 100 reads out the video data determined to be reproducible, decodes it, and displays the video in step S409. After that, the process returns to step S402.

In step S410, which proceeds when the lock counter variable is not 0 in step S407, the alternative video generation unit 109 of the playback device 100 displays the value of the lock counter variable as the number of locks, fixed video data (for example, video data of the substitute video 202). ) Is generated. Then, in step S411, the reproduction device 100 initializes the lock counter variable to 0.

Next, in step S412, the playback device 100 reads out the fixed video data displaying the number of locks generated in step S410, and displays the video in step S413. After displaying the fixed video data in which the number of locks is displayed in step S413, the process proceeds to step S408, the playback device 100 reads the video data to be reproduced searched in step S402, and displays the video in step S409. Do. After that, the process returns to step S402.

According to the first embodiment, when the video data cannot be normally read from the recording medium 101, it is determined whether the video data is the locked target video data or the destroyed data, and the video data reproduction method is performed. You can switch. As a result, when playing back a plurality of video data continuously, if the video data cannot be read normally because it is set to the locked state, the continuous playback of the video data is continued and the destroyed video data is used. In some cases, it is possible to stop the continuous playback of the video data.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
Since the configuration of the reproduction device 100 in the second embodiment is the same as that of the reproduction device 100 in the first embodiment shown in FIG. 1, the description thereof will be omitted. In the second embodiment, when the video data is continuously reproduced, if the video data to be reproduced first is the video data to be locked, the playback device 100 does not reproduce the video data until the reproducible video data is read. To.

For example, it is assumed that the video data of the read video group 500 as shown in FIG. 5A is recorded on the recording medium 100. The read video group 500 includes videos 1 to 4, which are video data that can be read normally. Further, the read video group 500 includes locks 1 to 10, which are video data that cannot be read because they are locked targets, and destroyed data (destroy data) that cannot be read normally due to destruction of the data format or the like. .. The video data includes lock 1, lock 2, lock 3, lock 4, lock 5, lock 6, lock 7, lock 8, lock 9, lock 10, video 1, and video as shown by arrows in FIG. 5 (A). 2. It is assumed that the destruction data, the video 3, and the video 4 are read in this order.

At this time, if the reproduction device 100 performs the continuous reproduction process from the lock 1, the normal video data cannot be read out for the locks 1 to 10 and the destruction data. In the first embodiment, the video data of the locks 1 to 10 is regarded as the video data to be locked by the protected video determination unit 108, and the video data displaying the number of locks is reproduced. In the second embodiment described below, when the start of continuous playback is the video data to be locked, the video data of the video 502 displaying the number of locks is shown as in the playback image 501 illustrated in FIG. 5 (B). Does not play. In this example, the video data of the video 1 that can be played first is played. After that, the reproduction device 100 continues the continuous reproduction, sequentially reproduces the video 2, and then stops the continuous reproduction operation at the point where the destruction data is read out.

Next, the operation of the reproduction device 100 in the second embodiment will be described with reference to FIG. FIG. 6 is a flowchart showing an example of continuous reproduction processing of video data in the reproduction device 100 in the second embodiment.

When the continuous playback process is started, in step S601, the playback device 100 has a lock counter variable indicating the number of video data to be locked (number of locks) and the number of video data actually played back after starting the continuous playback process. Initializes the playback counter variable that indicates to 0. In step S602, the reproduction device 100 searches the recording medium 101 for the video data to be reproduced next. In step S603, the reproduction device 100 determines whether or not there is video data to be reproduced next. As a result of the determination, if it is determined that there is video data to be reproduced next (YES), the process proceeds to step S604, and if it is determined that there is no video data to be reproduced next (NO), the continuous reproduction process is terminated.

In step S604, the reproducibility determination unit 105 of the reproduction device 100 determines whether or not the video data is correctly reproducible video data as described above. When the reproduction possibility determination unit 105 determines that the video data cannot be reproduced (NO), the process proceeds to step S605, and when the reproduction possibility determination unit 105 determines that the video data can be reproduced (YES). ), The process proceeds to step S607.

In step S605, the protected video determination unit 108 of the playback device 100 determines whether or not the video data is the video data to be locked as described above. When the protected video determination unit 108 determines that the video data is the video data to be locked (YES), the process proceeds to step S606. On the other hand, when the protected video determination unit 108 determines that the video data is not the video data to be locked (NO), it is regarded as the destroyed video data and the continuous playback process is terminated.

In step S606, the reproduction device 100 increments the lock counter variable by one, and the process returns to step S602.

In step S607, which proceeds when it is determined in step S604 that the video data can be reproduced, the reproduction device 100 confirms the value of the lock counter variable. If the value of the lock counter variable is 0 (YES), the process proceeds to step S608, and if the value of the lock counter variable is not 0 (NO), the process proceeds to step S611.

In step S608, the reproduction device 100 reads out and decodes the video data determined to be reproducible. Then, in step S609, the reproduction device 100 increments the reproduction counter variable by one and initializes the lock counter variable to zero. Subsequently, in step S610, the playback device 100 displays the video of the read video data, and the process returns to step S602.

In step S611, which proceeds when the lock counter variable is not 0 in step S607, the reproduction device 100 confirms the value of the reproduction counter variable. When the value of the playback counter variable is 0 (YES), it is considered that the video data to be played first in the continuous playback processing is the video data to be locked, and the processing after step S608 described above is performed without displaying the number of locks. I do. If the value of the reproduction counter variable is not 0 (NO), the process proceeds to step S612.

In step S612, the alternative video generation unit 109 of the playback device 100 generates fixed video data in which the value of the lock counter variable is displayed as the number of locks. Then, in step S613, the reproduction device 100 initializes the lock counter variable to 0.

Next, in step S614, the playback device 100 reads out the fixed video data displaying the number of locks generated in step S612, and displays the video in step S615. After displaying the fixed video data in which the number of locks is displayed in step S615, the processes after step S608 described above are performed.

According to the second embodiment, as in the first embodiment, when the video data is continuously played back, if the video data cannot be read normally because it is set to the locked state, the continuous playback is continued. However, if the video data is destroyed, continuous playback can be stopped.

(Other Embodiments of the present invention)
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

For example, the reproduction device shown in the first and second embodiments has a computer function as shown in FIG. 7, and the operation in the first and second embodiments is performed by the CPU 701. FIG. 7 is a diagram showing a configuration example of a computer function capable of realizing the playback device according to the present embodiment. A CPU (Central Processing Unit) 701, a storage unit 702, a RAM (Random Access Memory) 703, a display control unit 704, an input unit 705, and a media slot 706 are connected to the internal bus 200. Each part connected to the internal bus 700 is configured so that data can be input and output from each other via the internal bus 700.

The CPU 701 controls each part of the reproduction device 100. The storage unit 702 stores various programs, data, and the like for operating the CPU 701. The CPU 701 executes various processes by, for example, using the RAM 703 as a work memory and executing the processes according to the program stored in the storage unit 702. For example, the CPU 701 realizes the above-mentioned flowchart processing and various functions by executing the processing according to the program.

The display control unit 704 outputs a display signal for displaying a video, various information, and the like on the display 708. For example, the CPU 701 supplies the display control signal generated according to the program to the display control unit 704, and the display control unit 704 generates a display signal based on the display control signal and outputs the display signal to the display 708. For example, the display control unit 704 causes the display 708 to display a composite image of the image data read from the recording medium 707 or the like based on the display control signal generated by the CPU 701.

The input unit 705 accepts a user operation, generates a control signal according to the operation, and supplies the control signal to the CPU 701. For example, the input unit 705 has an electronic dial, a touch panel, or the like as an input means for receiving a user operation. The CPU 701 controls each unit of the reproduction device 100 according to a program based on a control signal generated by the input unit 705 in response to a user operation. A recording medium 707 can be mounted in the media slot 706, and data is read from the mounted recording medium 707 and data is written to the recording medium 707 based on the control of the CPU 701.

It should be noted that the above-described embodiments are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

100: Playback device 101: Recording medium 102: Drive unit 103: Read control unit 104: Memory 105: Playability determination unit 106: Video reproduction unit 107: Display unit 108: Protected image determination unit 109: Alternative video generation unit

Claims (9)

A first determination means for determining whether or not the video data read from the recording medium is reproducible video data,
A second determination means for determining whether or not the video data determined to be unreproducible by the first determination means is the video data to be locked in the recording medium.
When a plurality of video data recorded on the recording medium are continuously reproduced, the video data determined to be unreproducible by the first determination means is locked by the second determination means. If it is determined to be the target, the alternative data instead of the video data is reproduced, and if it is determined by the second determination means that the data is not the lock target, the video data and the alternative data are reproduced. A reproduction device characterized by having a control means for controlling not to perform the operation. The first aspect of claim 1, wherein the control means controls to reproduce the alternative data including information indicating the number of video data determined to be the lock target by the second determination means. Playback device. It has a counting means for counting the number of video data determined to be the lock target by the second determination means.
The counting means counts consecutive video data to be locked in a predetermined order of the plurality of video data.
The reproduction device according to claim 2, wherein the control means controls to reproduce the alternative data including information indicating the number of the video data to be locked counted by the counting means. When the control means has not reproduced any video data determined to be reproducible by the first determination means after starting the process related to reproduction, the control means is said by the second determination means. The reproduction device according to any one of claims 1 to 3, wherein the alternative data is controlled so as not to be reproduced even when it is determined that the data is locked. Claims 1 to 3 characterized in that the control means controls to reproduce the alternative data after reproducing at least one video data determined to be reproducible by the first determination means. The reproduction device according to any one of the above. The first determination means according to any one of claims 1 to 5, wherein it is determined that the video data read from the recording medium cannot be reproduced unless it conforms to a predetermined format. Playback device. The second determination means determines that the video data to be locked is the video data to be locked when the same data or data of a predetermined pattern is continuous for a certain amount or more in the video data read from the recording medium. The reproduction device according to any one of claims 1 to 6, which is characterized. The first determination step of determining whether or not the video data read from the recording medium is reproducible video data, and
A second determination step of determining whether or not the video data determined to be unreproducible in the first determination step is the video data to be locked in the recording medium.
When a plurality of video data recorded on the recording medium are continuously reproduced, the video data determined to be unreproducible in the first determination step is subjected to the second determination step. When it is determined that it is the lock target, the substitute data is reproduced instead of the video data, and when it is determined that the lock target is not the lock target in the second determination step, the video data and the substitute data are reproduced. A reproduction method characterized by having a control step for controlling the reproduction of the data. The first determination step of determining whether or not the video data read from the recording medium is reproducible video data, and
A second determination step for determining whether or not the video data determined to be unreproducible in the first determination step is the video data to be locked in the recording medium.
When a plurality of video data recorded on the recording medium are continuously reproduced, the video data determined to be unreproducible in the first determination step is determined in the second determination step. If it is determined that it is the lock target, the substitute data is reproduced instead of the video data, and if it is determined that the lock target is not the lock target in the second determination step, the video data and the substitute data are reproduced. A program that causes a computer to perform control steps that control the playback of data.

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