JP2003111044A - Contents data converter, and recording and reproducing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect an access point capable of starting reproduction of contents so as to prevent reproduction from other points than the point and properly apply accounting processing to reproduction of the contents. SOLUTION: An attached information generating means 2 generates attached information including position data of the access point capable of reproduction start, an access point protection means 3 applies processing of protecting the access point with respect to contents data and outputs multiplexed attached information. Further, when a reproduction site reproduces the contents, the reproduction side can reproduces the contents from the access point only. Moreover, accounting processing can be attained altogether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content data conversion device for converting content data, and a recording / reproduction system for recording the converted content data and reproducing it in consideration of billing.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Patent Laid-Open No.
The computer system and the content protection method proposed in 0-311114 make it possible to protect the content from unauthorized use even when the content is recorded in an open recording medium such as a hard disk drive, and to use the digital content. It is possible to achieve both protection. FIG. 9 is a configuration diagram representative of this technique, and 910 is a personal computer. In the personal computer 910, when the secure manager 911 uses the recording media 914 and 915 having the media ID, the media ID of each recording medium in which the content is recorded.
Use to manage content encryption and decryption. On the other hand, when using the HDD 913 that does not have a media ID, the secure manager 911 acquires a system-specific device ID via the BIOS and uses the device ID to encrypt the content to be recorded in the HDD 913. Manages decryption. This technique is based on the viewpoint of protecting and managing contents recorded on various recording media in content units, particularly when managed by a computer system.

As a conventional technique, Japanese Patent Laid-Open No. 2000-
The playback management method and playback device proposed in 207834 allow viewing of programs with restrictions on recording, etc., to be freely performed after being correctly charged.
When receiving data transmitted through a predetermined network and recording the received data in the data storage, management information regarding the number of times of reproduction of this data is added and stored, and the received data recorded in the data storage is reproduced. At this time, the management information added to the received data is read, and the stored received data is reproduced based on the number of times of reproduction indicated by the management information, and the read management information is updated and stored. It was done like this.

Further, there are many conventional encryption methods for protecting contents. In FIG.
A block cipher, which is one of typical encryption methods, will be described. The block cipher mode in FIG. 10 is Ciph.
This is an adaptive mode called er Feed Back (hereinafter referred to as CFB). Here, the i-th plaintext block is Mi and the cipher block is Ci. First, an initial value is set in the shift register 921 and is encrypted by the encryption means 922 using the key 923. Cipher block Ci is obtained by taking the left r bits of this output and taking the XOR (exclusive OR) with the r bits of plaintext Mi. The left r bits of this Ci are added to the right side of the shift register 921, the left r bits of the shift register are removed, and the data in the shift register 921 is used for encryption of the next plaintext block. The above is a description of the CFB mode, which is an example of a block cipher, but there are many other encryption methods, and such an encryption technique is used to protect contents from unauthorized copying. There is.

[0005]

As described above, in the conventional recording / reproducing system, with respect to reproduction or management of the content that is transmitted or recorded in the recording medium, processing for each content, that is, one content is performed. It was a system for collectively encrypting, reproducing, and charging. Generally, in one content, it is intended by the copyright holder, creator, etc.
Although there are some access points that allow playback to start, the conventional recording / playback system does not have means for protecting the access point and preventing playback from any other position. Moreover, there has not been provided a mechanism for more advanced content protection and billing management, such as billing by an appropriate billing method.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to protect the access point of the contents and to charge the contents data by an appropriate charging system. An object of the present invention is to provide a conversion device and a recording / reproducing system using the same.

[0007]

In order to solve the above-mentioned problems, the present invention (claim 1) provides, in a content data conversion device for converting content data, information on an access point capable of starting reproduction of the content data. Attached information generating means for generating attached information including: and access point protection processing for enabling the content data to be reproduced only from the access point, and the attached information generated by the attached information generating means. And an access point protection means for adding information.

According to the present invention (claim 2), in a recording / reproducing system for receiving or recording the content data converted by the content data conversion device according to claim 1, and reproducing the content data, the accessory for acquiring the accessory information. An information acquisition unit and a restoration unit that starts reproduction from the access point included in the attached information and restores the original content data from the access point-protected content data are provided.

According to the present invention (claim 3), in the content data conversion device according to claim 1, the access point protection means has two access sections between the access points or between the access point and the content end.
Key information generating means for generating key information and information indicating which data section is to be converted using the key information for each data section divided into two or more data sections; Data conversion means for converting the content data of each data section using the key information and adding the attached information generated by the attached information generating means.

The present invention (claim 4) is the recording / reproducing system according to claim 2, wherein the restoring means obtains the key information, and the key obtained by the key information obtaining means. The data reverse conversion means for reversely converting the data in each data section using the information to obtain the original content data is provided.

According to the present invention (claim 5), in the content data conversion device according to claim 3, the key information generated from a certain section data is converted into the section data existing immediately after the section data. It is used.

According to the present invention (claim 6), in the recording / reproducing system according to claim 4, the key information generated from a certain section data is used for data conversion of the section data existing immediately after the section data. It is a thing.

The present invention (claim 7) is the content data conversion device according to claim 3 or 5, wherein the information generated by the key information generating means further includes data for error correction for the key information. Is included.

According to the present invention (claim 8), in the recording / reproducing system according to claim 4 or 6, the key information acquisition means is generated by the key information generation means of the content data conversion device according to claim 7. The key information is reproduced by using the error correction data for the key information.

Further, the present invention (Claim 9) is, in the content data conversion apparatus according to any one of Claims 1 or 3, 5, and 7, the attached information indicates that the content is a chargeable content. It includes billing information and passing point data for billing processing.

The present invention (Claim 10) includes Claim 2.
Alternatively, the recording / reproducing system according to any one of 4, 6, and 8 further includes a billing information processing unit, wherein the billing information processing unit obtains billing information from the attached information, and the reproducible access to the content. By reproducing from the points, the type of the passing point data and the number of detections are counted, and these data are used for billing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Embodiment 1 of the present invention, which corresponds to the inventions of claims 1 to 8, will be described below with reference to FIGS. 1 to 6. 1 is a block diagram of a content data converter according to a first embodiment of the present invention, and FIG. 2 is a block diagram of a recording / reproducing system using the same.

The content data conversion apparatus shown in FIG. 1 is provided with a content data input terminal 1 to which a content is input, and information attached to the content, for example, that the content is protected by an access point (hereinafter referred to as AP), and its access. Attached information generating means 2 for generating attached information including position data of points, and A for content data
The access point protection means 3 performs a process of protecting P, and the access point protection means 3 includes a data conversion means 31 and a key information generation means 32.

The recording / reproducing system of FIG. 2 records and reproduces AP-protected content data on a recording medium and reproduces the recorded content, and auxiliary information for acquiring additional information from the content data. An acquisition unit 5, a restoration unit 6 that restores the original content data from the AP-protected content data, a data reverse conversion unit 61 that constitutes the restoration unit 6, a key information acquisition unit 62, and outputs the restored content data. And a content data output terminal 7.

Next, the operations of the content data converter and the recording / reproducing system according to the first embodiment will be described. The attached information generating means 2 generates an AP data collection in which data, which is the number of bytes from the beginning of the content, is collected as the access point position information of the content input from the content data input terminal 1, the reproduction start of which is permitted. To do. FIG. 5 shows an example of AP. In FIG.
(A) shows one content to which attached information is added, and the content data is, for example, a program stream, a transport stream, etc., of a program composed of a compressed video stream or audio stream. A stream and a stream containing data related thereto are used in a digital recording medium or a digital broadcasting system. Further, FIG. 5B shows an example of an AP group provided in the content. AP0 is the beginning of the content, AP9 is the end of the content, and AP1 and AP2 are APs provided in the middle of the content. The attached information also includes information that the content is AP protected, and the side that reproduces the content can recognize that the content is AP protected by this information.

The access point protection means 3 is a data conversion means 31 and a key information generation means 3 which will be described below.
It is composed of two. The key information generating means 32 divides the input content data into, for example, every 128 bytes, and generates key information for each section data.

The data converting means 31 adds (multiplexes) the attached information to the content, or the key information of the preceding section data sent from the key information generating means 32 and the section sent now. The exclusive OR operation with the data is performed and the result is output. The additional information can be added to the content by an existing method, for example, by finding a free area of the content data and adding it, or by adding an area that can be added by changing the data rate. Can be made easier.

Next, the operations of the key information generating means 32 and the data converting means 31 will be described with reference to FIGS. 3 and 5. FIG. 3 is a detailed diagram of the configurations of the key information generating means 32 and the data converting means 31. In FIG. 3, the data dividing unit 312 outputs section data obtained by dividing the multiplexed content data into 128-byte data, and the arithmetic unit 313 performs an exclusive OR with the key information output by the key information generating unit 32. After performing the calculation and outputting, the key information generating means 32 holds the section data output by the data dividing section 312 as the key information for the next section data. By repeating the above operation for each section data up to the next AP, the AP of the content data is protected.
However, when the section data of the content data is the section data immediately after the content or immediately after the AP, the key information is reset to zero. For example, A in FIG.
The section from P1 to AP2 is 128 as shown in FIG.
It is divided into section data of A0 and A1 to An for each byte, and the key information of A0 immediately after AP1 is zero, and the calculator 313 performs an exclusive OR operation of this and A0 and outputs it. The key information generating means 32 uses the section data A0.
Is held as key information for the next section data A1. For the next section data A1, the calculator 313 sets A
1 and A0 which is the key information output by the key information generating means 32.
The key information generating means 32 holds the A1 as the key information of the next section data A2 while performing the exclusive OR operation with and outputting. By repeating the above operation for each section data up to the section data An (immediately before AP2),
AP protection of content data is performed, and as a result,
The signals S0, S1 to Sn shown in FIG. 5D are output.
By the way, if the interval up to the next AP is not an integral multiple of 128 bytes, there is no problem if the content data is stuffed with invalid bytes so that it becomes an integral multiple of 128 bytes. Also, the multiplexer 31
1 (MUX 311) adds (multiplexes) the attached information from the attached information generating means 2 to the content data and outputs it.

The recording / reproducing means 4 records or reproduces the content protected by the access point on a recording medium (not shown). The attached information acquisition unit 5 obtains the attached information from the content reproduced by the recording / reproduction unit 4, and detects whether or not the content is protected by an access point. The restoration unit 6 is composed of a data reverse conversion unit 61 and a key information acquisition unit 62, which will be described below. The data reverse conversion means 61 uses the key information sent from the key information acquisition means 62 to restore the original section data. The key information acquisition means 62 obtains key information from the section data sent from the data reverse conversion means 61.

The operations of the data reverse conversion means 61 and the key information acquisition means 62 will be described with reference to FIGS. 4 and 5. FIG. 4 shows the key information acquisition means 62 and the data reverse conversion means 61.
3 is a diagram showing a detailed configuration of FIG. In FIG. 4, the demultiplexer 611 (DEMUX 611) is added to the content data to the attached information acquisition means 5 (multiplex).
The divided attached information is separated and output, and the data dividing means 61
2 outputs the section data obtained by dividing the input content data into data of 128 bytes, and the computing unit 613
The key information acquisition unit 62 performs an exclusive OR operation with the key information output by the key information acquisition unit 62, and outputs the result.
Holds this as key information for restoring the next section data. The above operation is performed by the following A for each section data.
By repeating the process up to P, the AP protection of the content is canceled and the correct content data of the original data is restored. With such a method, for example, AP protection of S0, S1 ... Sn shown in FIG.
The section data of A1 ... An is restored and output.

The content data output terminal 7 outputs the content data and transfers it to, for example, a decoding means (not shown) connected in the subsequent stage. As described above, according to the first embodiment, in the content data conversion device for converting content data, the auxiliary information generating means for generating information on the access point capable of starting reproduction of the content data, and the content data And an access point protection unit for performing an access point protection process for enabling reproduction only from the access point and for adding the attached information generated by the attached information generation unit. In a recording / reproducing system that receives or records converted content data and reproduces it, an accessory information acquisition unit that acquires the accessory information and a content that is started to be reproduced from an access point in the accessory information and is protected by the access point Original content data from data Since a restoring means for the original for, and converts the data of the content, to protect the access point to enable start playback, during playback, it is possible to realize a system that can not be reproduced only from the access point.

In addition, in the content data conversion apparatus according to the first embodiment, the access point protection means further divides the data between the access points or between the access point and the content end into two or more data sections. Key information generation means for generating key information for each section and information indicating which data section is converted using the key information, and each data section using the key information for the content data. With the data conversion means for converting the content data and adding the additional information generated by the additional information generating means, it is possible to effectively protect the access point of the content.

Further, in the recording / reproducing system according to the first embodiment, the restoring means further uses the key information obtaining means for obtaining the key information and the key information obtained by the key information obtaining means for each data. Inversely transform the data in the interval,
Since the data reverse conversion means for obtaining the original content data is provided, the content protected by the access point by the data conversion using the key information can be reproduced from the access point. Further, in the first embodiment, the key information generated from a certain section data is used for the data conversion of the section data existing immediately after the section data, so that the access point is protected according to the arrangement of the data sections. be able to. In the above, 1
Content data was divided every 28 bytes, but 128
It may be divided into bytes other than bytes.

Further, in the key information generating means 32, the input content data may be converted (reversed conversion) by using a particular determined algorithm or function.
Further, immediately after the arithmetic unit 313 or immediately after the output of the MUX 311, an encryption unit (not shown) is arranged to encrypt and output the content data, and immediately before the input of the data dividing unit 612 or the arithmetic unit. Immediately before the input of 613, a decryption means (not shown) for decrypting it may be arranged.

The length of the key information may or may not match the section data length. Also, the arithmetic unit 3
The calculation by 13 or the like may be performed only for a specific portion of the predetermined section data.

Further, in the above, the key information is reset to zero immediately after the AP, but the key information is not zero,
The value may be a predetermined value or a value determined by a specific procedure, and for example, existing authentication,
It may be secret key information generated from a public key used in the encryption method. Further, the key information to be processed for the next section data may be generated from the key information thus generated. In that case, the section data is after was treated with the key information, may also be used to generate the key information for the next section data, or information indicating whether the key information beforehand to for which section data May be provided as the additional information, and the key information may be processed based on this information to restore the section data.

Further, in this recording / reproducing system, the error correction data of the key information is generated by the existing method, the error correction data is added to the contents as shown in FIG. 6, and at the time of reproduction, The error correction data may be used to generate key information, the AP protection may be canceled, and the original content data may be restored. The insertion of the error correction data into the content and the insertion of the information indicating that the error correction data and the like are inserted into the content are performed in the same manner as the addition of the additional information.
This makes it possible to prevent an error from being propagated when the content data is restored during reproduction.

In addition, in the protection of the AP, a part or all of the content before or after the AP protection is further encrypted by the conventional encryption method. Good. Further, the protection of the access point described above is an example, and another method may be used as long as the access point is protected.

(Second Embodiment) A second embodiment of the present invention, which corresponds to the ninth and tenth aspects of the present invention, will be described below with reference to FIGS. 7 and 8. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted below. FIG. 7 is a configuration diagram of the recording / reproducing system according to the second embodiment. In FIG. 7, in the case where the recording / reproducing system according to the second embodiment is charged for viewing the AP-protected content and is reproduced. A billing information processing means 8 for performing billing information processing is provided.

Next, the operation of the recording / reproducing system in the second embodiment will be described. First, the attached information generating means 2 inserts the unique data detected at the time of reproduction into the content before AP protection. The unique data is inserted, for example, at the positions of TP0, TP1 and TP2 shown in FIG. After that, AP protection processing is performed on the content in which the unique data is inserted.

In reproducing the content, the unique information is detected and acquired by the auxiliary information acquisition means 5, and the billing information processing means 8 determines the type and the number of times of the detected unique data, for example, an internal nonvolatile memory or the like. To record.

The type of the unique data and the number of times serve as parameters for determining the charging fee, and the type and the number of times of the unique data, that is, the charging information are viewed through, for example, a wired line (not shown). It is sent to a management center or the like (not shown) that manages it, and processing such as viewing fee billing is performed.

As described above, in the second embodiment, the additional information added in the content data conversion device, which indicates that the attached information is the content to be charged, and the passing point data for the charging process, are provided. Since this is included, it is possible to perform an appropriate billing process by using the access point described in the first embodiment and further newly using the passing data.

In the second embodiment, the peculiar data is inserted in the attached information, but in addition to this, information indicating that the content is a charging target is added to the recording / reproducing system to charge the charging target content. You may make it clear that it is. In that case, the insertion of the information may be performed before or after the AP protection is performed.

[0040]

As described above, the content data conversion apparatus according to the first aspect of the present invention is the content data conversion apparatus for converting content data, and includes the information of the access point from which the reproduction of the content data can be started. An adjunct information generating means for generating adjunct information, and an access point protection process for allowing the content data to be reproduced only from the access point, and the adjunct information generated by the adjunct information generating means. Since the access point protection means for performing addition is provided, there is an effect that the access point of the content can be protected.

Further, a recording / reproducing system according to a second aspect of the invention is a recording / reproducing system which receives or records the content data converted by the content data converting apparatus according to the first aspect and reproduces the content data, thereby acquiring the attached information. The access point protected content is provided with the attached information acquiring means and the restoring means for starting the reproduction from the access point included in the attached information and restoring the original content data from the access point protected content data. However, there is an effect that it can be played back from the access point.

According to a third aspect of the present invention, in the content data converting apparatus according to the first aspect, the access point protection means has two access sections between the access points or between the access point and the content end. Key information generating means for generating key information and information indicating which data section is to be converted using the key information for each data section divided into two or more data sections; , The data conversion means for converting the content data of each data section using the key information and adding the attached information generated by the attached information generating means, so that the access point of the content is protected. There is an effect that can be.

According to a fourth aspect of the present invention, in the recording / reproducing system according to the second aspect, the restoring means obtains the key information by the key information obtaining means and the key information obtaining means. Since the data in each data section is inversely converted by using the key information to obtain the original content data, it is possible to reproduce the content protected by the access point from the access point. effective.

According to a fifth aspect of the present invention, in the content data converting apparatus according to the third aspect, the key information generated from certain section data is used as data of section data existing immediately after the section data. Since it is used for conversion, there is an effect that access points can be protected according to the arrangement of data sections.

According to a sixth aspect of the present invention, there is provided a recording / reproducing system according to the fourth aspect, wherein the key information generated from a certain section data is converted into the section data existing immediately after the section data. Since it is used, there is an effect that access points can be protected according to the arrangement of data sections.

Further, the content data conversion device according to claim 7 is the content data conversion device according to claim 3 or 5, wherein the information generated by the key information generation means further includes error correction for the key information. Since it was decided to include the data of the above, it is possible to accurately reproduce the key information and restore the content data even if an error occurs in the data in the process from the protection of the access point to the reproduction of the content data. There is an effect that can be done.

The recording / reproducing system according to claim 8 is the recording / reproducing system according to claim 4 or 6, wherein the key information acquisition means is the key information generating means of the content data conversion apparatus according to claim 7. Since the key information is reproduced using the data for error correction with respect to the generated key information, even when an error occurs in the data in the process from the protection of the access point to the reproduction of the content data, There is an effect that the key information can be accurately reproduced and the content data can be restored.

The content data converter according to a ninth aspect is the content data converter according to any one of the first, third, fifth, and seventh aspects, wherein the attached information is content to be charged. Since the billing information indicating such things and the passing point data for billing processing are included, there is an effect that it becomes possible to perform billing for the reproduction of the protected content by the access point.

A recording / reproducing system according to a tenth aspect of the present invention is the recording / reproducing system according to any one of the second or fourth, sixth, and eighth aspects, further comprising a charge information processing means, and the charge information processing means. Obtains billing information from the attached information, counts the type of the passing point data and the number of detections by playing the content from the reproducible access point, and uses the data for billing. Therefore, there is an effect that the access point can be charged for the reproduction of the protected content.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a content data conversion device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a recording / reproducing system according to the first embodiment of the present invention.

FIG. 3 is a partial configuration diagram of a content data conversion device according to the first embodiment of the present invention.

FIG. 4 is a partial configuration diagram of the recording / reproducing system according to the first embodiment of the present invention.

FIG. 5 is a diagram showing content data and access points according to the first embodiment of the present invention.

FIG. 6 is a diagram showing content data and error correction data according to the first embodiment of the present invention.

FIG. 7 is a configuration diagram of a recording / reproducing system according to a second embodiment of the present invention.

FIG. 8 is a diagram showing content data and passage data according to the second embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional example.

FIG. 10 is a configuration diagram of a conventional example.

[Explanation of symbols]

1 Content data input terminal 2 Additional information generation means 3 Access point protection measures 31 Data conversion means 32 means for generating key information 4 Recording / reproducing means 5 Additional information acquisition means 6 Restoration means 61 data reverse conversion means 62 Key information acquisition means 7 Content data output terminal 8 Billing information processing means

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Claims (10)

[Claims] 1. A content data conversion device for converting content data, which includes: auxiliary information generating means for generating additional information including information on an access point from which reproduction of the content data can be started; Content data comprising access point protection means for performing access point protection processing for enabling reproduction only from the access point, and for adding the accessory information generated by the accessory information generation means. Converter. 2. A recording / reproducing system for receiving or recording the content data converted by the content data conversion apparatus according to claim 1, and reproducing the content data, the auxiliary information acquiring unit for acquiring the additional information, and the additional information. A recording / reproducing system comprising: a reproduction unit that starts reproduction from an access point included in the above and restores the original content data from the content data protected by the access point. 3. The content data conversion device according to claim 1, wherein the access point protection unit divides a section between access points or between an access point and a content end into two or more data sections for each data section. A key information generating means for generating key information and information indicating which data section is to be converted using the key information; and, for the content data, the content of each data section using the key information. While converting the data,
A content data conversion device, comprising: a data conversion unit that adds the additional information generated by the additional information generation unit. 4. The recording / reproducing system according to claim 2, wherein the restoration unit uses a key information acquisition unit that acquires the key information, and a key information acquired by the key information acquisition unit. A recording / reproducing system comprising: a data reverse conversion means for reversely converting data to obtain original content data. 5. The content data conversion device according to claim 3, wherein key information generated from certain section data is used for data conversion of section data existing immediately after the section data. Converter. 6. The recording / reproducing system according to claim 4, wherein the key information generated from certain section data is used for data conversion of section data existing immediately after the section data. . 7. The content data conversion device according to claim 3 or 5, wherein the information generated by the key information generation means further includes data for error correction with respect to the key information. Data converter. 8. The recording / reproducing system according to claim 4 or 6, wherein the key information acquisition unit is for correcting an error in the key information generated by the key information generation unit of the content data conversion apparatus according to claim 7. The recording / reproducing system is characterized in that the key information is reproduced using the data of. 9. The content data conversion device according to claim 1, wherein the attached information is billing information indicating that the content is billable content, and a billing process. A content data conversion device characterized by including passage point data for. 10. The recording / reproducing system according to claim 2, or 4, 6, or 8, further comprising: billing information processing means, wherein the billing information processing means obtains billing information from the attached information. However, by reproducing the content from the reproducible access point, the type of the passing point data and the number of times of detection are counted, and the data is used for billing. Playback system.