JP4857511B2 - Reproduction apparatus and method, recording medium, and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a playback apparatus and method, a recording medium, and a program. For example, the playback apparatus and method are suitable for use when summarizing and playing back video and audio such as a television program recorded on an information recording medium. , A recording medium, and a program.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it relates to an apparatus for recording and reproducing video and audio (hereinafter referred to as program content) such as a television program on a hard disk drive or the like, and features relating to the contents of the program content when recording the program content (For example, as a period of high importance in terms of content, for example, a period in which a character string such as subtitles is displayed on the screen for the first few seconds when the video scene of the program content is switched, For example, a silent period of program content audio, a period in which the same scene continues, a period of commercial messages inserted in the middle of the program content, etc., and is recorded and played as a feature point file. Sometimes, based on the recorded feature point file, The period during which the program content is less important in terms of content (commercial messages, periods in which video and audio are redundant, etc.) is skipped and the program content is useful for understanding the content of the program content (number of video scenes at the beginning) There is a technology that reproduces only the second). Hereinafter, such a reproduction method is described as digest reproduction.
[0003]
[Problems to be solved by the invention]
By the way, there is no particular problem as long as the video and audio obtained by digest reproduction of the recorded program content are only viewed. However, when recording digested video and audio is considered, even if the copy control information for the program content is “Copy freely” and the program content is allowed to be copied, A problem may arise in that the identity of the program content cannot be maintained.
[0004]
Therefore, it is desirable to limit the recording of digested video and audio, but there has been a problem that such technology has not been established.
[0005]
The present invention has been made in view of such circumstances, and an object thereof is to maintain the identity of program content that is a copyrighted work by prohibiting recording of digested video and audio. To do.
[0006]
[Means for Solving the Problems]
The playback apparatus of the present invention plays back based on playback means for playing back content data from an information recording medium, and playback control information that is recorded in the information recording medium in association with the content data and includes a period to skip during digest playback. a reproduction control means for digest reproduction content data recorded by controlling the means to the information recording medium, to re-generated content data, see contains a copy protection means for applying copy protect processing, copy protect means, Copy protection processing is performed on content data that is normally reproduced and is copy-capable, and content data that is digest-reproduced and is copy-capable.
The playback apparatus of the present invention can further include an update means for updating the playback control information in response to a user operation when content data is normally played back from the information recording medium.
[0007]
The copy protect means can insert a macrovision signal into a blanking interval of an analog video signal obtained as a result of digest reproduction of content data .
[0009]
The copy protect means can divide digitally encoded data obtained as a result of digest reproduction of content data into IEEE 1394 isochronous packets and encrypt the payload portion of the packets.
[0010]
The copy protect means can encrypt the payload portion of the IEEE1394 isochronous packet based on the DTCP standard.
[0011]
The reproduction method of the present invention comprises a reproduction control step for controlling the reproduction means based on the reproduction control information recorded on the information recording medium in association with the content data to perform digest reproduction of the content data recorded on the information recording medium; , to re-generated content data, see contains a copy protection step of performing a copy protect processing, copy protection steps have been normally reproduced, without applying the copy protection process for the content data that is capable copied Then, copy protection processing is performed on the content data that has been digest reproduced and can be copied .
[0012]
Recording medium of the present invention is based on the reproduction control information recorded on the information recording medium in association with the content data, the reproduction control step of the digest reproducing content data recorded on the information recording medium controls the reproduction means If, with respect to re-generated content data, see contains a copy protection step of performing a copy protect processing, copy protection steps have been normal reproduction, subjected to copy protection processing for the content data that is capable copied First, a program for causing the computer of the playback apparatus to execute a copy protection process on the content data that can be copied and reproduced by the digest is recorded.
[0013]
A program according to the present invention comprises a reproduction control step for controlling the reproduction means based on the reproduction control information recorded on the information recording medium in association with the content data to perform digest reproduction of the content data recorded on the information recording medium; to re-generated content data, see contains a copy protection step of performing a copy protect processing, copy protection steps have been normally reproduced, without applying the copy protection process for the content data that is a copy-permitted, The reproduction apparatus computer is caused to execute a copy protection process on the digested content data that can be copied .
[0014]
Content In the present invention, which on the basis of the reproduction control information recorded on the information recording medium in association with the content data, content data recording and reproducing means is controlled in the information recording medium is a digest reproduction has been played back Copy protection processing is performed on the data. At this time, copy protection processing is not performed on content data that is normally reproduced and enabled to be copied, and copy protection processing is performed on content data that is digest-reproduced and is copy-capable. .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A configuration example of a recording / reproducing apparatus to which the present invention is applied will be described with reference to FIG. This recording / reproducing apparatus receives a desired program content from an input RF signal such as a television broadcast, encodes it, records it on a hard disk drive (HDD) 9, and reproduces the recorded program content normally or digestly. Is.
[0016]
The control unit 1 controls the drive 3 to read a control program recorded on a recording medium 4 made of a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and read the control program and operation input unit 2, the entire recording / reproducing apparatus is controlled via a control line (not shown) based on a user operation command input from 2.
[0017]
Further, the control unit 1 generates a feature point file based on the detection result of the feature points supplied from the feature point detection unit 7 at the time of recording, and associates the data with the digital encoded data in which the program content is encoded. The data is recorded on the hard disk drive 9. The control unit 1 also updates the feature point file based on the digest playback edit point setting information input from the operation input unit 2 during normal playback, and converts the program content into digitally encoded data encoded. The data is recorded in the data hard disk drive 9 in association with each other. Further, the control unit 1 reads out the feature point file recorded in the hard disk drive 9 during the digest reproduction, and skips without reproducing any part of the total reproduction time of the recorded digital encoded data. The reproduction pattern indicating which part is reproduced is determined.
[0018]
The operation input unit 2 includes a remote controller and its receiving unit (both not shown). For example, a channel selection operation for selecting a receiving channel, an operation for instructing recording, an operation for instructing normal reproduction, a digest An operation for instructing reproduction is received from the user, and a corresponding operation command is supplied to the control unit 1. The operation input unit 2 accepts a user operation for setting an edit point for digest playback (indicating a period during which playback is skipped during digest playback, etc.) while viewing the program content during normal playback. The setting information is output to the control unit 1.
[0019]
The tuner 5 extracts the program content of the channel selected by the user from the input RF signal of the television broadcast based on the control from the control unit 1, and the MPEG (Moving Picture Experts Group) encoder / decoder 6 and the features thereof. Output to the point detector 7.
[0020]
The MPEG encoder / decoder 6 encodes the program content input from the tuner 5 according to, for example, the MPEG2 system, and outputs the obtained digitally encoded data to the hard disk drive 9 via the buffer 8. The MPEG encoder / decoder 6 decodes digitally encoded data read from the hard disk drive 9 and input via the buffer 8, and outputs an analog audio signal of the obtained program content to the subsequent stage, thereby obtaining the obtained program. The analog video signal of the content is output to the analog video signal protect unit 10. The MPEG encoder / decoder 6 can also output the digital encoded data input via the buffer 8 as it is to the digital signal protector 11 without decoding it. Whether the MPEG encoder / decoder 6 outputs an analog video signal and an analog audio signal or digitally encoded data may be selected by the user or connected to the subsequent stage of the recording / reproducing apparatus. The control unit 1 may select according to the device to be performed.
[0021]
The feature point detection unit 7 detects feature points of the program content input from the tuner 5 and outputs the detection result to the control unit 1. As a method for detecting feature points of the program content, for example, when a video scene of the program content is switched or when a character string such as a subtitle is displayed on the screen, it is detected as a highly important part. Further, for example, a silent period of the program content, a commercial message inserted in the middle of the program content, or the like is detected as a low importance part.
[0022]
The buffer 8 buffers the digital code data from the MPEG encoder / decoder 6 so as not to overflow at the time of writing in the hard disk drive 9. The buffer 8 buffers the digital code data read from the hard disk drive 9 so as not to overflow when encoded by the MPEG encoder / decoder 6.
[0023]
The hard disk drive 9 stores digitally encoded data input from the MPEG encoder / decoder 6 via the buffer 8 in accordance with control from the control unit 1. Further, the hard disk drive 9 reads the stored digital encoded data according to the control from the control unit 1 and outputs it to the MPEG encoder / decoder 6 via the buffer 8.
[0024]
The analog video signal protect unit 10 performs a macro on the analog video signal of the program content supplied from the MPEG encoder / decoder 6 according to the control from the control unit 1 during the digest reproduction, for example, in the vertical blanking interval. Predetermined copy protection information such as a vision signal (a signal for restricting recording processing in a recording apparatus connected at a later stage) is inserted.
[0025]
The digital signal protector 11 inserts copy protect information into the digitally encoded data of the program content supplied from the MPEG encoder / decoder 6 according to the control from the control unit 1 during digest reproduction, and IEEE (Institute of Institute) Electrical and Electronics Engineers) Outputs to subsequent devices via 1394 bus. Specifically, the digital encoded data of the program content is divided into IEEE1394 isochronous packets, and the encryption mode (EMI: Encryption Mode Indicator) defined in, for example, 5C DTCP (Digital Transmission Content Protection) is added to the header of the IEEE1394 isochronous packet. ) Is set. The encryption mode will be described later with reference to FIGS. 4 and 5.
[0026]
Note that the copy protection process for the digested program content by the analog video signal protector 10 or the digital signal protector 11 during digest playback is performed even if the copy control information of the original program content is “Copy freely”. Executed.
[0027]
Next, recording processing of the recording / reproducing apparatus will be described with reference to the flowchart of FIG. This recording process is started when the operation input unit 2 receives an operation instructing the start of recording from the user and outputs a corresponding command to the control unit 1. The MPEG encoder / decoder 6 and the feature point detection unit 7 are in a state in which program content corresponding to the user's channel selection is input from the tuner 5.
[0028]
In step S <b> 1, the feature point detection unit 7 starts detecting feature points of the program content input from the tuner 5.
[0029]
In step S 2, the MPEG encoder / decoder 6 encodes the program content input from the tuner 5 to generate digitally encoded data, and outputs it to the hard disk drive 9 via the buffer 8. The hard disk drive 9 starts storing the input digital encoded data.
[0030]
In step S3, the feature point detector 7 determines whether or not a feature point of the program content has been detected. If it is determined that a feature point has been detected, the process proceeds to step S4. In step S <b> 4, the feature point detection unit 7 notifies the control unit 1 of information on the detected feature point (temporal position, importance thereof, etc.). The control unit 1 updates the feature point file stored in the hard disk drive 9 by adding and storing the feature point information notified from the feature point detection unit 7. If it is determined in step S3 that no feature point has been detected, the process in step S4 is skipped.
[0031]
In step S5, the control unit 1 determines whether or not an operation for instructing the end of recording from the user has been performed. If it is determined that an operation for instructing termination has not been performed, the process returns to step S3, and the subsequent processes are repeated. Thereafter, when it is determined in step S5 that an operation for instructing termination has been performed, the process proceeds to step S6.
[0032]
In step S6, the feature point detector 7 stops detecting feature points of the program content. The MPEG encoder / decoder 5 finishes encoding the program content. Accordingly, the storage of the digital encoded data in the hard disk drive 9 is also terminated.
[0033]
By the recording process described above, the hard disk drive 9 stores the digitally encoded data of the program content and the corresponding feature point file.
[0034]
Next, playback processing of the recording / playback apparatus will be described with reference to the flowchart of FIG. In this reproduction process, the operation input unit 2 accepts an operation for selecting digitally encoded data to be reproduced from the user and an operation for instructing the start of reproduction (normal reproduction) or digest reproduction, and controls the corresponding command. It is started when it is output to part 1.
[0035]
In step S11, the control unit 1 determines whether the instruction from the user is digest playback, that is, whether the playback mode is digest playback. If it is determined that the playback mode is digest playback, the process proceeds to step S12.
[0036]
In step S12, the control unit 1 reads the feature point file corresponding to the selected digitally encoded data from the hard disk drive 9, and does not reproduce any part of the total reproduction time of the selected digitally encoded data. A playback pattern indicating which portion is to be skipped and played back is determined. For example, skipping the playback of commercial messages and redundant scenes, and helping to understand the contents of the program content, such as the first few seconds when the video scene is switched and the period during which subtitles are displayed The playback pattern is determined so that only the part with high importance is played back.
[0037]
In step S <b> 13, the hard disk drive 9 reads out the portion corresponding to the reproduction pattern determined by the control unit 1 from the stored digitally encoded data, and outputs it to the MPEG encoder / decoder 5 via the buffer 8. The MPEG encoder / decoder 5 decodes the digitally encoded data input via the buffer 8 in accordance with the reproduction pattern determined by the control unit 1, and converts the obtained analog video signal of the program content into the analog video signal protection unit 10 The analog audio signal thus obtained is delayed by the processing of the analog video signal protector 10 for the analog video signal and output to the subsequent stage.
[0038]
In step S <b> 14, the analog video signal protector 10 inserts predetermined copy protection information such as a macrovision signal into the analog video signal of the program content and outputs it to the subsequent stage in accordance with the control from the controller 1.
[0039]
If it is determined in step S11 that the playback mode is not digest playback, the process proceeds to step S15. In step S15, normal reproduction is performed. That is, the hard disk drive 9 reads the selected digitally encoded data and outputs it to the MPEG encoder / decoder 5 via the buffer 8. The MPEG encoder / decoder 5 decodes the digitally encoded data input through the buffer 8 in accordance with the control from the control unit 1 and outputs an analog video signal of the obtained program content to the analog video signal protect unit 10 Then, the obtained analog audio signal is output to the subsequent stage. At this time, the analog video signal protector 10 outputs the input analog video signal as it is to the subsequent stage. If an operation for setting an edit point is performed by the user during normal reproduction, the feature point file recorded in the hard disk drive 9 is updated in accordance with the operation.
[0040]
Incidentally, in step S13, the MPEG encoder / decoder 5 may output the digitally encoded data input via the buffer 8 to the digital signal protector 11 as it is. In this case, in step S14, the digital signal protector 11 divides the digitally encoded data of the program content into IEEE1394 isochronous packets based on the control from the controller 1, and is defined in the header of the IEEE1394 isochronous packet in 5C DTCP. By setting the encryption mode (EMI) to “11”, the digitally encoded data that has been digest-reproduced is set to “Copy-Never” and output to the subsequent stage. It should be noted that by setting the encryption mode (EMI) to “01”, the digitally reproduced data that has been digest-reproduced may be set to “No-more-copies” and output to the subsequent stage. This is the end of the description of the playback process.
[0041]
Here, the encryption mode set in the header of the IEEE1394 isochronous packet will be described with reference to FIG. 4 and FIG. FIG. 4 shows the format of an IEEE1394 isochronous packet. In the 16-bit area Data Length, the data length of the packet is stored. In the 2-bit area Tag, a label “00” relating to the format of the packet is stored. In the 6-bit area Channel, a value indicating a channel in the IEEE1394 bus is stored. A 4-bit area Tcode stores a value indicating the type of packet and the type of transaction. In the 4-bit area Sy, application-specific control information is stored. Information for detecting an error in the header is stored in the 32-bit area Header CRC. The area Data Field stores divided program digital encoded data. The 32-bit area Data CRC stores information for error detection of data stored in the area Data Field.
[0042]
In 5C DTCP, a 2-bit area EMI and a 1-bit area O / E are provided in a 4-bit area Sy. The encryption mode is stored in the area EMI. The area O / E stores key switching information used for encryption.
[0043]
FIG. 5 shows encryption mode values stored in the area EMI. The value “00” of the encryption mode indicates “Copy-freely”, that is, it is permitted to freely copy the data. The value “01” of the encryption mode indicates “No-more-copies”, that is, the data is the original first-generation copy, and copying beyond this is prohibited. The value “10” of the encryption mode indicates “Copy-one-generation”, that is, it is permitted to copy only one generation of the data. The value “11” of the encryption mode indicates “Copy-Never”, that is, the data is prohibited from being copied.
[0044]
As described above, according to the recording / playback apparatus to which the present invention is applied, when the recorded program content is normally played back, that is, when the program content is output as it is without being copy-protected and is played back as a digest, the original program content is Even if the copy control information is “Copy freely”, it is output with copy protection. Therefore, it is possible to prevent the digested program content from being recorded in a subsequent device.
[0045]
By the way, the series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a recording medium 4 shown in FIG.
[0046]
The recording medium 4 is distributed to provide a program to the user separately from the computer, and includes a magnetic disk (including a floppy disk) on which the program is recorded, an optical disk (CD-ROM (Compact Disc-Read Only Memory). ), DVD (including Digital Versatile Disc), magneto-optical disc (including MD (Mini Disc)), or packaged media consisting of semiconductor memory, etc. It is composed of a ROM, hard disk, etc., where the program is recorded.
[0047]
In the present specification, the step of describing the program recorded in the recording medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series, either in parallel or individually. The process to be executed is also included.
[0048]
【Effect of the invention】
As described above, according to this onset bright, it is possible to retain the identity of the program content is a remarkable crop.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining recording processing by the recording / reproducing apparatus of FIG. 1;
FIG. 3 is a flowchart for explaining playback processing by the recording / playback apparatus of FIG. 1;
FIG. 4 is a diagram showing a format of an IEEE1394 isochronous packet.
FIG. 5 is a diagram illustrating the meaning of an encryption code (EMI) value.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Control part, 2 Operation input part, 4 Recording medium, 6 MPEG encoder / decoder, 7 Feature point detection part, 9 Hard disk drive, 10 Analog video signal protection part, 11 Digital signal protection part

Claims (8)

In a playback device for playing back content data recorded on an information recording medium,
Reproducing means for reproducing the content data from the information recording medium;
Wherein recorded on the information recording medium in association with the content data, based on the playback control information including a period to be skipped during the digest playback, the content data recorded on the information recording medium by controlling said reproducing means Playback control means for digest playback,
Copy protection means for applying copy protection processing to the reproduced content data,
The copy protection means includes
The copy protection processing is not performed on the content data that is normally reproduced and made copyable,
A playback apparatus that performs the copy protection process on the content data that has been digest-reproduced and is capable of being copied. The playback apparatus according to claim 1, further comprising updating means for updating the playback control information in response to a user operation when the content data is normally played back from the information recording medium. The playback apparatus according to claim 1, wherein the copy protect means inserts a macrovision signal into a blanking section of an analog video signal obtained as a result of the digest playback of the content data. The reproducing apparatus according to claim 1, wherein the copy protect means divides digitally encoded data obtained as a result of the digest reproduction of the content data into IEEE1394 isochronous packets and encrypts a payload portion of the packets. The reproducing apparatus according to claim 4, wherein the copy protect means encrypts a payload portion of the IEEE1394 isochronous packet based on a DTCP standard. In a reproducing method of a reproducing apparatus provided with reproducing means for reproducing content data recorded on an information recording medium,
A reproduction control step of the content data in association with, based on the playback control information recorded on the information recording medium, thereby the digest by controlling the reproducing means the content data recorded on the information recording medium reproducing,
A copy protection step for applying copy protection processing to the reproduced content data,
The copy protection step includes
The copy protection processing is not performed on the content data that is normally reproduced and made copyable,
A reproduction method in which the copy protection processing is performed on the content data that has been digest-reproduced and can be copied. A program for controlling a playback device including playback means for playing back content data recorded on an information recording medium,
A reproduction control step of the content data in association with, based on the playback control information recorded on the information recording medium, thereby the digest by controlling the reproducing means the content data recorded on the information recording medium reproducing,
A copy protection step for applying copy protection processing to the reproduced content data,
The copy protection step includes
The copy protection processing is not performed on the content data that is normally reproduced and made copyable,
A recording medium on which a program for causing a computer of a playback device to execute the copy protection process on the content data that has been digest-reproduced and made copyable is recorded. A program for controlling a playback device including playback means for playing back content data recorded on an information recording medium,
A reproduction control step of the content data in association with, based on the playback control information recorded on the information recording medium, thereby the digest by controlling the reproducing means the content data recorded on the information recording medium reproducing,
A copy protection step for applying copy protection processing to the reproduced content data,
The copy protection step includes
The copy protection processing is not performed on the content data that is normally reproduced and made copyable,
A program that causes a computer of a playback apparatus to execute a process for performing the copy protection process on the content data that has been digest-reproduced and is made copyable.

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