JP2003272288A - Information processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor for limiting the number of reproduction times of digital contents to thereby contribute to protection of the digital contents. <P>SOLUTION: An error insertion position control section 52 controls a position of attaching error information depending on deterioration control information acquired from encoded data stored in an encoded data storage section 20 by a deterioration control information acquisition section 51. An error attachment control section 55 controls production of the error information by an error generating section 56 depending on the number of reproduction times of the encoded data acquired by a section 54 for counting the number of times of reproduction. An error composite section 57 inserts the error information to the encoded data decoded and supplied from an encoding analysis section 53 and a re-encoded data recording section 59 stores encoded data re-encoded by a re-encoding section 58 into an encoded data stored section 20. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Information processing devices that handle content, especially digital
Information processing devices that can restrict the use of content
About. 2. Description of the Related Art At present, digital content such as music, images, etc.
Digital content recording
・ Hard disk drive (HDD), DV for transmission etc.
There are recording media such as HS, DVD-RAM, DVD-RW
Or communication broadcasting means such as satellite broadcasting. Conventionally, digital content has been illegally copied.
As a method of protecting from cable TV, for example,
Network, digital content, etc.
From the distribution source to the transmitting station (or relay station)
Digital content in the primary distribution of content
Are distributed as digital signals and transmitted from the transmitting station (relay station).
Digital content is used for secondary distribution to
A method of converting a signal into a analog signal and distributing the signal is known. In such a method, the secondary distributed
There is further distribution because tenz is an analog signal
Or, when recording is repeated, the signal deteriorates each time. Sandals
If the content was recorded with analog signals,
Unlimited content, as the quality gradually degrades
Distribution can be suppressed, and the content can be protected.
Also, if the analog signal is coded again and the digital signal is
Signal is degraded when re-encoding
Therefore, assuming this deterioration,
Or you can restrict copying. [0005] In addition, digital broadcasting by satellite broadcasting or the like.
For services that provide content for a fee, etc.
Digital content with scrambled transmission
And only descramble users who have paid
Key to allow descrambling.
In this way, digital contents are protected. [0006] However, the above-mentioned problems
In the method using scramble, once a malicious user
The scramble is released and the digital content is
When the contents are restored, the restored digital content
Content can be copied and redistributed indefinitely.
U. [0007] Thus, once the digital
Unlimited use of tents without further deterioration
Conventional content protection methods
Disruption and redelivery could not be reliably prevented. [0008] Digital data is analog data.
Unlike storage, it does not degrade when stored. Provisional
Even if deterioration occurs, it is added in advance
The original data can be restored with the error correction information.
Can be. For this reason, digital content is distributed.
Hardly degrades when copying, allowing unlimited copying
is there. As a result, once copied digital content
Is available semi-permanently and unconditionally.
U. The present invention has been made in view of the above-mentioned problems.
Digital content according to the number of uses.
Of digital content by deteriorating
To provide an information processing device capable of limiting the number of times of life
The purpose is to. [0010] To solve the above-mentioned problems,
For example, the information processing apparatus according to the present invention uses an encoded
Coded data to obtain coded data for digital content
Data acquisition means and encoding obtained by the encoded data acquisition means.
A coded data storage means for storing data;
Temporarily stores the encoded data stored in the data storage means.
From the held reproduction data holding means and the reproduced data holding means
Decoding and replaying to decode and play back the read encoded data
Generating means, at least encoded data storing means and reproduced data.
Coded data from one of the data holding means
An error level is added to the encoded data every time the encoded data is reproduced.
Adds error information that increases the number of packets and stores encoded data
Means for adding cumulative error information stored in the means.
And features. In this information processing apparatus, the cumulative error information
The adding means includes an encoded data storage means and a reproduction data holding means.
In the encoded data obtained from one of the stages,
Error information that increases the error rate each time the data is played back
And stores it in the encoded data storage means. This gives
The error rate of encoded data increases each time encoded data is reproduced.
Add. In the above invention, the encoded data
Becomes MPEG (MovingPictureExpertGroup) coding method
Therefore, it is encoded, and the deterioration control information is at least
GOV (Group of VOP [VideoObje
ctPlane] s) or IVOP (IntraVOPs), P in GOV
VOP (PredictedVOPs), BVOP (Bi-directional I
nterpolatedVOPs) as error information
It is preferable to include information indicating a portion to be added. DESCRIPTION OF THE PREFERRED EMBODIMENTS (Structure) The present invention
-Delivered via information processing networks such as the Internet
It can be applied to information processing devices that use content.
Wear. An information processing apparatus according to an embodiment of the present invention
Processor (MPU), memory, hard disk drive
Auxiliary storage device such as Eve (HDD), optical disk drive, etc.
Keyboard, network interface (NI
C) and other input devices, display devices, image signal output
Personal computer with an output device such as an interface
It consists of a computer, a workstation, and so on. This information processing apparatus is, for example, as shown in FIG.
To obtain content data supplied from outside
Encoded data acquisition unit 10 and encoded data acquisition unit
Encoded data storage for storing the encoded data from 10
20 and stored in the encoded data storage unit 20.
Playback data storage unit 30 for temporarily holding encoded data
And the encoded data stored in the reproduction data storage unit 30.
A decoding / playback unit 40 for decoding and playing back the data;
To the encoded data stored in the data storage unit 20.
Adds error information that is accumulated each time encoded data is reproduced.
Cumulative error information adding unit 50,
And a control unit 60 for controlling the operation. Note that the configuration shown in FIG.
Can be implemented as hardware.
For executing the information processing program according to the above with an MPU
It can also be realized as software. Information processing according to the present invention
Processing programs are, for example, magnetic tapes, flexible
Magnetic recording media such as disks, magneto-optical disks, CD-ROMs
Recording media such as optical disk recording media or flash surfaces
It is stored in a medium, and is used to configure the above-mentioned information processing apparatus.
Memory and read by MPU.
Wear. As a result, the functions shown in FIG.
Can be. The coded data acquisition unit 10 includes an external device or the like.
Input unit 11 for inputting content from
Encoding unit 12 that encodes the content by the processing of
Have. Further, the encoded data storage unit 20 includes, for example,
Supplementary note provided in the above information processing device such as HDD
It can be realized as a predetermined area in the storage device. The reproduction data storage unit 30 stores, for example,
It is realized by using a predetermined area in the memory
High-speed reading of encoded data from the data storage unit 20
It is used as a buffer to convert. The decoding / reproducing unit 40 performs processing such as decompression.
The encoded data stored in the reproduction data storage unit 30 is
A decoding unit 41 for decoding data, and a
Format required by external devices, etc.
(For example, an analog composite video signal)
And a reproducing unit 42 for generating and outputting. The above-mentioned cumulative error information adding section 50
Is the encoded data read from the encoded data storage 20.
Error information that increases the error rate for each playback.
In addition, it is fed back to the encoded data storage unit 20. The accumulative error information adding unit 50 has a code
From the encoded data stored in the encoded data storage unit 20
A deterioration control information acquisition unit 51 for acquiring deterioration control information;
Error insertion position control to control the position where error information is inserted
Unit 52 and an encoding analysis unit 53 for decoding encoded data
And a number-of-reproductions counter for counting the number of reproductions of the encoded data
54, an error addition control unit for controlling addition of error information
55, an error generation unit 56 for generating error information,
Error information that combines error information with the encoded data
The encoding unit 57 encodes the decoded encoded data again.
A re-encoding unit 58 for storing encoded data in an encoded data storage unit
20 and a re-encoded data recording section 59 for storing the
You. The control unit 60 is, for example, the MPU described above.
Executes predetermined processing in the information processing program
Therefore, the operation of the entire information processing apparatus is
Control. The input section 11 of the encoded data acquisition section 10
Is an arbitrary content that can be recorded in the encoded data storage unit 20.
Content is supplied. For example, the input unit 11
Computer connected to an information processing network such as
Is an input device including the communication processing unit. Thus, the information processing
When connecting to a physical network, the input unit 11
Modem (MODE) corresponding to the processing network method
M), Home Line Terminating Unit (DSU), Network Controller (NC)
U), communication control unit (CCU), communication control processing unit (C
A data line termination (DCE) such as a CP) is provided.
You. The container supplied to the input unit 11
The format of the components is generally analog signals or compression codes.
It is often unencrypted digital data.
For example, for video, analog video signal, uncompressed
Digital data. However, the input unit 1
Digital data (encoded data) encoded in 1
Even if they are supplied, for example,
A plurality of encoding modules corresponding to the
1 is provided with a plurality of decoding modules,
11 corresponds to the encoding format of the encoded data supplied to
Select a module in the encoding unit 12 and the decoding unit 41
This can be dealt with. The contents supplied to the input unit 11 are
If the signal is a log signal, the input unit 11 performs A / D conversion,
After performing processing such as pre-filtering, the supplied
The log signal is converted into digital data,
To supply. The content supplied to the input unit 11 is a code
If the data is encoded data, the control unit 60
The encoding format is checked, and the encoding module corresponding to the encoding unit 12 is checked.
Switch to the rule. At this time, the control unit 60
Switch to a decoding module that also supports decoding section 41
Let it. The corresponding coding module is selected
And the content supplied to the input unit 11, the encoding unit 1
2, a predetermined process is performed and the encoded data storage unit 2
0 is supplied. On the other hand, the analog signal is
Converted digital data or encoded from the beginning
The digital data supplied to the input unit 11 without being
For example, a predetermined encoding preset in the encoding unit 12
Encoded data storage unit 2 encoded by the module
0 is supplied. The encoding module in the encoding unit 12
The encoding format according to the rule in the encoded data storage unit 20 is
Entropy coding that does not limit recording capacity
It is not particularly limited. Hereinafter, as an example, the encoding unit 12
MPEG (MovingPicture Expert Gro
up) when using the MPEG-4 system specified in
explain about. In the MPEG-4 system, a frame within a frame
An image is converted to multiple objects, such as background images, structures, people, etc.
Image (VOP: Video Object Plane)
And can be handled. Each object (VOP) is a frame
Coding (IVOP: Intra VOPs), inter-frame coding
(PVOP: Predicted VOPs), bidirectional predictive coding
(BVOP: Bi-directional VOPs)
Have been. Thus, for example, the background image is constant and the
In the case where only a structure or a person moves, for example, as shown in FIG.
Like the background image and the structure, person, etc.
And perform predictive coding to obtain the overall data
Data amount can be reduced. The encoded VOP is, for example, shown in FIG.
Is hierarchically blocked. For example, a predetermined VOP
GOV (Group of VOPs) is composed of
V constitutes a VOL (Video Object Layer). The coded data thus configured is
Encoding via an information processing network such as the Internet
The data is distributed to the data acquisition unit 10. Encoded data acquisition unit 1
0 indicates that the supplied encoded data is stored in the encoded data storage 2
Supply 0. The encoded data storage section 20 stores encoded data.
Encoded data supplied from the encoding unit 12 of the acquisition unit 10
Is stored. Recording used for this encoded data storage unit 20
The medium is capable of permanently recording digital data.
If there is no particular limitation, the following, as an example,
The case where an HDD is used will be described. The reproduction data storage unit 30 stores the encoded data format.
Temporarily stores digital data recorded in storage unit 20
It is used as a buffer. A sign as encoded data
The digital computer stored in the encoded data storage unit 20
When reproducing the tents, the control unit 60
The coded data required for reproduction is stored in the coded data storage 2
0 and sequentially stored in the reproduction data storage unit 30.
Stored occasionally. The reproduction data storage unit 30 includes a decoding unit
When there is a request from 41, the stored code
The decrypted data is read and supplied to the decoding unit 41. The decoding section 41 is provided in the reproduction data storage section 30.
The encoded data acquired from the encoding unit 12
Decoding and playback by decoding processing corresponding to the encoding format
To the unit 42. The reproducing section 42 is decoded by the decoding section 41.
Digitalized content using a display device
I do. As this display device. Generally moving image content
If it is, CRT or liquid crystal provided in the information processing device
Output devices such as displays correspond. Or information
Image signal output interface provided in the processing device
May be output via the. (Deterioration operation) By the way, this information processing apparatus
Then, the encoded data stored in the encoded data storage unit 20
Coded data is degraded every time
You. This deterioration operation is performed, for example, by referring to FIG. 4 (S1 to S1).
0) and the flowchart shown in FIG. 5 (S11 to S18).
It is executed according to. The number-of-reproductions counting section 54 stores encoded data.
Embedded in the encoded data held in the section 20 in advance
To get the description (play count information)
(S1) The acquired number of times of reproduction is transmitted to the error addition control unit 55.
Notify and set the number of playbacks to 1 for the next re-encoding.
Increase (S8). The error addition control unit 55 has a preset
Depending on the number of plays to start adding error information and the number of plays
Storage area for storing the error rate. Ella
-The additional control unit 55 performs recording when reproducing encoded data.
The number of times of reproduction and the number of times of reproduction stored in the storage area
The obtained number of times of reproduction is compared (S2), and the obtained number of times of reproduction is obtained.
Is greater than or equal to the number of plays stored in the storage area,
-The error rate of the error information generated by the
Set. Further, the error addition control section 55 performs the deterioration operation.
The start is instructed to the error generation unit 56. The error generation unit 56 includes an error addition control unit 5
Error rate set by 5 and error addition control
Error information (error data) in response to a start instruction from the
(S3), and generates the error information
The signal is supplied to the forming unit 57 and the re-encoding unit 58. The deterioration control information acquisition unit 51 is a unit for storing encoded data.
Encoding stored in encoded data storage unit 20
Obtain deterioration control information included in the data (S
4). The degradation control information includes
Error information is cumulatively added to
The information for determining whether or not the information is written is described. This deterioration control information is stored in a predetermined data block.
Each GOV is described, for example, in the above-mentioned GOV unit, and
Addition of error information by changing deterioration control information
You can control. Or, in this deterioration control information
Of the IVOP, PVOP, and BVOP in the GOV
Either or a combination of these or all of these
To identify the degraded part so that it degrades
Information may be included. Normally, IVOP, PVO included in GOV
When error information is added to P and BVOP, BV
Deterioration of PVOP over OP, IVOP over PVOP
Giving it increases the deterioration given in the time direction
From narrower to wider as needed
Can give cumulative degradation to encoded data.
Wear. Also, a header part and a data part of the encoded data
And request degradation for one or both of them.
Information for deterioration is described in the deterioration control information.
May be. According to such information, the header
By performing cumulative deterioration operations, the encoded data
Can bring a life to the body. Or, on the contrary,
By performing cumulative deterioration operations on the data
Use limits can be created in terms of quality. Also, the encoded data including the header part and the data part
By performing cumulative deterioration operations on the entire data,
Both when the degradation operation is performed independently on the header and data parts
Is expected to obtain the effect of the
It is possible to realize more various deterioration operations by operating
it can. As described above, the encoded data (digital
Deterioration control for the parts that the content creator degrades in advance
By specifying in the information, the part intended by the producer
Only the minute can be degraded, and more flexible degradation control
Can be realized. Incidentally, the degradation control information in the encoded data
Is degraded in the user area in the encoded data
If control information is included, the deterioration control information acquisition unit
Reference numeral 51 denotes deterioration control information from the user area by a predetermined method.
To get. Also, digital watermarks are used in encoded data.
If the deterioration control information is embedded by
The information acquisition unit 51 is a device that supports embedding of a digital watermark.
Deterioration control information is obtained by the method. Deterioration control information is an example
For example, in the user area in the encoded data or in the IVOP
Embedded. Thus, as digital watermark information
By including the degradation control information, malicious users
Makes it difficult to obtain the deterioration control information. Therefore,
It is difficult to prevent the deterioration of encoded data,
Can make unlimited use of content difficult
You. The above-mentioned deterioration control information is obtained by a predetermined method.
If the encoded data cannot be obtained, the control unit 60
It is determined that the reproduction is impossible, and the reproduction process ends. When the deterioration control information is obtained as described above,
The deterioration control information acquisition unit 51 outputs the acquired deterioration control information.
To the error insertion position control unit 52. The error insertion position control section 52 performs the deterioration control information.
Based on the deterioration control information notified from the information acquisition unit 51,
Which of the encoded data obtained from the reproduction data storage unit 30
It is determined whether error information is added to the portion (S5).
According to the determination result, the encoding analysis unit 53 and the re-encoding unit 58
Supply encoded data to any of the
Make a request. The result of the determination is that the encoded data including the header
If there is a degradation request for the whole, the error insertion position
The control unit 52 stores the code acquired from the reproduction data storage unit 30
The encoded data is supplied to the re-encoding unit 58. Also, the judgment result
Is the entire header part in the encoded data or header information
Is a degradation request for the entire data section that does not include
Indicates that the error insertion position control unit 52
When a degradation request is made to the header or data
The encoded data acquired from the reproduction data storage unit 30 is
It is supplied to the encoding analysis unit 53. Alternatively, the judgment result is
GOV of data section not including header information of encoded data
IVOP, PVOP, BVOP in whole or GOV
Inferior to any or a combination or all of
If the request is a conversion request, the error insertion position control unit 52
A degradation request is sent to the encoding analysis unit 53, and the reproduced data is
The encoded data obtained from the storage unit 30 is
Supply 3 The encoding analysis unit 53 controls the error insertion position.
Analyzes the encoding format of the encoded data supplied from the unit 52
At the same time, the error insertion position control unit 52 instructs
The part to which error information is added, for example, the entire header, data
Data part or GOV part or IVO in GOV
Any of P, PVOP, BVOP or a combination thereof
Or all of them, etc., and errors in the specified parts
It requests the error synthesizing unit 57 to add information. The error synthesizing unit 57 determines whether the encoding analysis unit 53
Specified portion (deteriorated) in the encoded data supplied from
Area), the error supplied from the error
-Add information. The degraded area specified by the coding analysis unit 53
Is the header part of the encoded data,
The generating unit 57 is configured to output the error information acquired from the error generating unit 56.
Is added only to the header part, and for the other parts,
Protect without performing the deterioration operation. Similarly, if the degraded area is the data area or the head
Data part, both the GOV part (S12)
Or IVOP, PVOP, BVOP in GOV
(S14) or its combination (S16) or its
Even in the case of all (S18), the error synthesis unit 57
Error information is added only to the specified degraded area, otherwise
Is protected without performing the deterioration operation. [0059] Thereby, the information indicated by the deterioration control information is obtained.
Error information can be added to the
The creation of digital content (encoded data)
The part intended by the adult can be degraded. The header of the encoded data is decoded by the decoding unit 41.
If the signal has deteriorated to the extent that it cannot be corrected,
The data portion of the data cannot be reproduced. this
The header part to prevent deterioration.
For example, if other data parts have repeatedly deteriorated,
Even if the image quality during playback is extremely reduced,
The reproduction of the coded data itself can be performed. That is,
Switch between the header section and the data section.
As a result, the encoding quality is
How to set the actual life of the data
It is possible to switch between the method of setting the life of the body. When error information is added as described above,
The error synthesizing unit 57 encodes encoded data to which error information has been added.
Is supplied to the re-encoding unit 58. Note that the deterioration control information acquisition unit 51
When deterioration control information in encoded data cannot be obtained due to factors
Or the encoding analysis unit 53 performs encoding for some reason.
Cannot distinguish between data header and data
In such cases, the encoded data
Is degraded to the point that it cannot be played,
Add degraded data randomly to the entire coded data
You may make it so. This allows playback of encoded data
It can be reliably prevented. As described above, the error insertion position control unit 52
Alternatively, encoded data is supplied from the error synthesis unit 57.
Then, the re-encoding unit 58 checks the supplied encoded data
The re-encoding processing is performed, and the
Supply. The error insertion position control unit 52
Data is supplied, that is, the encoded data including the header
When the addition of error information to the entire
Is obtained from the error generating unit 56 by the re-encoding unit 58
Error information is added over the entire encoded data to degrade
An operation is performed (S6). Further, the re-encoding unit 58
In order to prepare for deterioration control of the
The acquired deterioration control information is transmitted via the error insertion position control unit 52.
Error information according to the obtained deterioration control information.
Information is further added to the encoded data to which the
(S7). Further, it is embedded in the previous encoded data in advance.
To update the rare play count information,
New reproduction number information is obtained from the
New playback number information is embedded in the data. Work in this way
The generated encoded data is stored in the re-encoded data recording section 59.
Supplied. On the other hand, the encoded data
Is supplied, the notified encoded data already contains
Since the error information is added, the re-encoding unit 58
No deterioration operation is performed. In this case, the re-encoding unit 58
Acquires deterioration control information to prepare for the next deterioration control.
The deterioration control information acquired by the unit 51 is stored in an error insertion position control unit.
52, and according to the obtained deterioration control information,
Deterioration control for encoded data with error information added
Information is added (S7). Further, it is embedded in the previous encoded data in advance.
To update the rare play count information,
New reproduction number information is obtained from the
New playback number information is embedded in the data. Work in this way
The generated encoded data is stored in the re-encoded data recording section 59.
Supplied. The re-encoded data recording section 59 adds an error
According to the conditions set in the control unit 55, the re-encoding unit 5
8 stores the re-encoded data supplied from the encoded data storage unit
20 (S9). (Effect) As described above, according to this embodiment,
Digital information (encoded data)
Data) according to the deterioration control information added in advance.
Deterioration of encoded data every time encoded data is reproduced
Can be. That is, in this information processing apparatus,
The encoded data stored in the encoded data storage
Error rate increases with each reproduction of the encoded data.
Is controlled as follows. Therefore, in this information processing device,
In general, digital data (encoding
Data), every time digital data is used
The deterioration is accumulated, and gradually the decoding unit 41 or the reproducing unit 42
The error correction function provided in
Results in an unacceptable level of degradation. As a result, the digital controller once created
It is possible to prevent unlimited use of tents,
It can contribute to the protection of digital contents.
This allows content providers to use traditional selling methods
Can contribute to legitimate profits,
Maintain incentives for content producers
Can be contributed to. (Modification) As described above, the preferred embodiment of the present invention
However, the technical idea of the present invention is not limited to this.
The encoded data storage unit 2 is not
The encoded data held at 0 is used to reproduce the encoded data.
It suffices to have a means for deteriorating each time. The position at which the error information is inserted as described above is
When the control is not performed, for example, as shown in FIG.
The number of reproductions of the encoded data detected by the raw frequency counting unit 74
In response, error addition control section 75 adds the
Can be configured to control the addition of error information.
Wear. In this case, for example, the error addition control unit 75
Is a record that holds the number of playbacks to start adding error information.
Storage area, and the number of playbacks and
The number of reproductions obtained by the live number counting unit 74 is compared with the
The number of reproductions acquired by the number counting section 74 is the error addition control section.
If the number of playbacks is equal to or greater than the
Error information generated by the error generation unit 76
Set. As described above, the number of times of reproduction of the encoded data is monitored.
And set the error rate according to the number of playbacks
This makes it possible, for example, to
Error information at an error rate that makes playback impossible.
In this case, the number of playbacks of the encoded data itself is controlled.
Can be limited. In the above description, the code of the encoded data
Explanation on the case of using MPEG-4 as the encoding format
However, MPEG-2 was used as the encoding format of the encoded data.
Is used, the above-mentioned GO
Use GOP (GroupOf Pictures) instead of V
Can be used instead of the above-mentioned IVOP, PVOP, BVOP
(I, P, B). is there
Or construct these instead of VOPs or pictures
Degradation operation is performed for each macroblock
Good. The coded data acquisition unit 10 also determines
Embedded in the encoded data the identifier that allows the decoding
The decryption / reproduction unit 40 has an identifier embedding unit.
Identification that confirms that the discriminator is included in the encoded data
Child confirmation unit, if the identifier is included in the encoded data
An identifier control decoding unit that performs only decoding may be provided.
This degrades the identifier embedded in the encoded data
Playback of encoded data can be performed while not
You can do so. The present invention relates to the information processing apparatus described above.
Includes programs to implement functions on computers.
It is a thing. This program reads from a recording medium
Downloaded to a computer or via a communication network.
Transmitted over the network and captured by the computer.
You may. According to the present invention, cumulative error information adding means is provided.
Error in the encoded data every time the encoded data is reproduced.
-Encoded data with error information that increases the rate
By storing it in the storage means, every time encoded data is reproduced
The encoded data stored in the encoded data storage means.
The error rate of the data increases. For this reason, it usually deteriorates.
Digital content (encoded data)
Deterioration accumulates each time the digital content is played.
Can be stacked. This degradation limits the limits of error correction
Beyond that, digital content can be played
Gone. Therefore, according to the present invention, the encoded data storage
Control the number of times digital content stored in
Digital content can be restricted
can do. This enables digital content
Can be protected. In the present invention, the error information adding means
Indicates the part of the encoded data to which error information is added.
Error information according to the degradation control information
By controlling the position of the
Only the part can be degraded. This allows
Deterioration control for parts that digital content creators want to protect
If specified in the information, the encoded data that the producer wants to protect
Only the part in the data can be degraded.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating functions of an information processing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a VOP in digital content handled by the information processing apparatus. FIG. 3 is a diagram showing an example of a data structure of digital content handled by the information processing apparatus. FIG. 4 is a flowchart showing a digital content reproduction process by the information processing apparatus. FIG. 5 is a flowchart showing deterioration control processing for digital content by the information processing apparatus. FIG. 6 is a block diagram showing another configuration example of the information processing apparatus according to the present invention. [Description of Code] 10: encoded data acquisition unit, 11: input unit, 12: encoding unit, 20: encoded data storage unit, 30: reproduced data storage unit, 40: decoding / reproduction unit, 41: decoding Unit, 42 reproducing unit, 50 cumulative error information adding unit, 51 deterioration control information acquiring unit, 52 error insertion position control unit, 53 encoding analysis unit, 54 reproduction number counting unit, 55 error addition Control section, 56: error generation section, 57: error synthesis section, 58
... Re-encoding unit, 59 ... Re-encoded data recording unit

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 5C052 AA01 AB02 AB03 AB05 AB09                       CC01 CC06 CC11 DD04 DD10                 5C053 FA13 GA11 GB06 GB37 GB40                       JA21 KA20 LA14                 5D044 AB07 BC01 BC04 CC04 DE50                       GK12 GK20 HL11

Claims (1)

Claims: 1. An encoded data acquisition unit for acquiring encoded data of encoded digital content, and encoded data for storing the encoded data acquired by the encoded data acquisition unit. Storage means; reproduction data holding means for temporarily holding the encoded data stored in the encoded data storage means; and decoding / decoding for decoding and reproducing the encoded data read from the reproduction data holding means. A reproducing unit, the encoded data is acquired from at least one of the encoded data storage unit and the reproduced data holding unit, and an error in which the acquired encoded data has an error rate that increases the error rate every time the encoded data is reproduced. Cumulative error information adding means for adding information to the encoded data storage means, and storing the accumulated error information in the encoded data storage means. Degradation information including information indicating a portion of the encoded data to which the error information is to be added; the cumulative error information adding means includes: an error generating means for generating the error information; Deterioration control information obtaining means for obtaining the deterioration control information in the coded data obtained from the data storage means; and coded data obtained from at least one of the coded data storage means and the reproduced data holding means, An error insertion position control unit that controls a position in the encoded data to which the error information is added based on the acquired deterioration control information; and a position in the encoded data specified by the error insertion position control unit. An information processing apparatus comprising: an error adding unit that adds the error information generated by the error generating unit.