JP2006324990A - Metadata reception device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metadata reception device and method which prevents unauthorized use of metadata by taking the metadata as a work to perform control processing like alteration detection and is capable of securing convenience of the metadata in the reception device. <P>SOLUTION: A metadata processing part 22 converts received metadata to a prescribed data format and records it into a metadata DB 25 together with information for alteration detection of the metadata in the converted data format, which is generated by a metadata alteration detection information calculating part 232. When metadata are utilized by an indication to reproduce a content utilizing the metadata, or the like, the calculating part 232 generates information for alteration detection of the metadata for use, which is read out from the metadata DB 25 by metadata processing part 22. The metadata processing part 22 compares recorded information for alteration detection of metadata with generated information for alteration detection to detect alteration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a metadata receiving apparatus and method for receiving metadata related to digital content in digital broadcasting, broadband distribution, and the like.

  Conventionally, the distribution of digital content by digital broadcasting deals with information such as program name, program overview, broadcast date and time, performer information, etc. as content metadata of the broadcasted program, etc., and these information is electronic program guide (EPG). : Electronic Program Guide) service provided to viewers. Another metadata is segment metadata of indexing information in a program. This in-program segment metadata is data given to each scene in the program, and information indicating the contents of each scene, for example, scene position information that is elapsed time information from the beginning of the program, the time width of the scene, etc. Contains information.

  In recent years, storage-type broadcast services, such as server-type broadcast services, have a conventional view such as digest viewing that extracts only important scenes on the receiving device side, and multi-scenarios that change scenarios according to the viewer's selection. The use method for more attractive viewing than passive program viewing is being studied. It is considered to use the segment metadata for the usage control. Therefore, content creators including metadata creators have a desire to view metadata as a copyrighted work and protect it in the same way as content.

  For example, as a conventional digital broadcasting system, an information distribution apparatus, a reception apparatus, and an information distribution apparatus that can provide a communication method in which a copy protection technique can be extended not only to IEEE 1394 but also to digital content distribution on a network such as the Internet, and the like. A communication method is disclosed (for example, see Patent Document 1). In addition, a content protection system that prevents falsification of information for preventing unauthorized reproduction on other terminals and prevents unauthorized reproduction of content is disclosed (for example, see Patent Document 2). Further, a metadata transmission / reception method, a transmission / reception device, and a metadata transmission / reception program that can be shared by both the transmission / reception of metadata formats such as an index within a program, have a high metadata security level, and can protect the metadata. Is disclosed (for example, see Patent Document 3).

JP 2000-287192 A JP 2000-324096 A JP 2003-152696 A

  However, even if the techniques of Patent Documents 1 and 2 are used, the metadata may be tampered with illegally, and the metadata added to the content cannot be protected and distributed.

When the metadata is tampered with,
(1) In broadcast wave or communication, during transmission before being received (2) There are two cases after recording in the receiving device. When the metadata is used without being illegally used, a mechanism for preventing unauthorized use is also required for the tampering at the timing of (2) until the content is used using the metadata. Patent Document 3 discloses a method for realizing metadata protection until the content is used by using a method that uses a common format on both the transmission side and the reception side. If it is restricted to the format defined on the transmission side up to this format, functions that should originally be implemented may be restricted at the discretion of the receiving device manufacturer, and this is not preferable in view of the convenience of the receiving device.

  Metadata used as a conventional EPG service is merely additional information, and has not been used for control processing such as falsification detection and use suppression in the use of content such as reproduction. Therefore, processing such as detection of falsification of metadata and suppression of use of falsified metadata has not been implemented in the receiving apparatus.

  The present invention has been made in view of the above-described conventional circumstances, and prevents unauthorized use of metadata as a copyrighted work by performing control processing such as falsification detection, and metadata in a receiving apparatus. An object of the present invention is to provide a metadata receiving apparatus and method capable of ensuring the convenience of the above.

  A metadata receiving apparatus according to the present invention is a metadata receiving apparatus that receives metadata including falsification detection data related to content, wherein the metadata receiving apparatus receives the metadata, and the received metadata is converted into a predetermined data format. Conversion means for converting to the first data, first falsification detection information generating means for generating falsification detection information of the metadata in the converted data format, the converted metadata and the falsification detection information generated are recorded. Recording means to read out, when using the metadata, reading out the metadata to be used from the recording means, and generating falsification detection information for the read metadata, and The metadata falsification detection information recorded in the recording means and the second falsification detection information generation means are generated. Comprising a a first alteration detecting means for detecting tampering by comparing the falsification detection information.

  With this configuration, it is possible to protect the metadata from falsification and prevent unauthorized use while ensuring convenience such as a format change in the receiving apparatus.

  In the metadata receiving apparatus of the present invention, the receiving means receives metadata encrypted so as to be decryptable with the first key information, and decrypts the encrypted metadata with the first key information. Metadata decoding means is further provided.

  With this configuration, the portion from the metadata transmitting device to the receiving device is encrypted by a method that can be decrypted with a decryption key (first key information) that is commonly provided by the receiving devices having the right to receive, for example. As a result, it is possible to prevent metadata from being leaked to a receiving apparatus or the like that does not have the right to receive.

  In the metadata receiving apparatus of the present invention, the receiving means can decrypt the metadata encrypted so as to be decrypted by the first key information and the second key information multiplexed on the metadata. The decryption key information decrypting means for receiving the encrypted first key information and decrypting the first key information with the second key information, and the decrypted first key information Metadata decrypting means for decrypting the encrypted metadata.

  With this configuration, the second key information is encrypted with a key that is individually held by the receiver and transmitted, so that metadata that can be decrypted only by a specific receiver can be distributed, and the distribution method is free. You can raise the degree.

  In the metadata receiving apparatus of the present invention, after the receiving unit is divided into TSP (transport stream packet) which is a minimum unit constituting a transport stream as the encrypted metadata. The TSP filter means for receiving the signal in which the data portion of the TSP is encrypted and extracting the TSP from the received signal is further provided, and the metadata decryption means includes the encrypted data in the extracted TSP. Is decrypted using the first key information.

  With this configuration, for example, in a metadata transmission apparatus that transmits metadata, metadata encryption / compatibility compatible with the limited reception method (B-CAS method) for content protection used in current BS digital broadcasting is provided. Thus, the broadcaster can perform metadata encryption processing using an existing content encryption device without preparing a new device for metadata encryption.

  In the metadata reception device of the present invention, the reception unit receives the falsification detection data of the received metadata, and generates falsification detection information for the received metadata. It further comprises information generation means, and second falsification detection means for detecting falsification by comparing the received falsification detection data with the generated falsification detection information.

  This configuration introduces a mechanism for transmitting only original metadata between the transmission device and the reception device by detecting tampering between the transmission device that transmits the metadata and the metadata reception device of the present invention. It becomes possible.

  The metadata receiving device of the present invention further includes an export processing unit that encrypts and exports the metadata to another metadata receiving device, and the second falsification detection information generating unit includes the export processing unit. When exporting the metadata, the metadata to be exported is read from the recording means, and the falsification detection information of the read metadata is generated. The first falsification detection means is recorded in the recording means. The falsification detection information of the existing metadata is compared with the falsification detection information generated by the second falsification detection information generating means to detect falsification.

  With this configuration, the falsification detection function also works when exporting metadata to another metadata receiving apparatus, so that it is possible to guarantee that the metadata has not been changed from the production time.

  The metadata receiving apparatus of the present invention further includes import processing means for importing metadata from other metadata receiving apparatuses.

  With this configuration, since the falsification detection function works even when importing metadata from another metadata receiving apparatus, it is possible to prevent the use of content using the falsified metadata.

  The metadata reception method of the present invention is a metadata reception method for receiving metadata including falsification detection data relating to content, the step of receiving the metadata, and converting the received metadata into a predetermined data format. A step of converting, a step of generating metadata falsification detection information in the converted data format, a step of recording the converted metadata and the generated falsification detection information in a recording means, and the metadata Reading out the metadata to be used from the recording means, and generating the falsification detection information of the read metadata; and falsification detection information of the metadata recorded in the recording means; Comparing the generated falsification detection information to detect falsification.

  With this method, the receiving device can protect the metadata from falsification and prevent unauthorized use while ensuring convenience such as a format change.

  According to the present invention, by performing control processing such as falsification detection as metadata as a copyrighted work, it is prevented from being illegally used in the entire process from transmission of metadata to reception / use, and at the receiving device. A metadata receiving apparatus and method capable of ensuring the convenience of metadata can be provided.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration example of a metadata transmission system according to the first embodiment of the present invention. As shown in FIG. 1, in the metadata transmission system of the present embodiment, metadata is distributed from the metadata transmission system 1 to the metadata reception device 2 by broadcasting or communication.

  The metadata transmission system 1 generates metadata defined as a transmission format from content information, adds metadata for falsification detection, and a content transmission unit 14 that transmits content in the MPEG2-TS format. , Key information generating means 10 for generating key information for decrypting metadata, and a key for a CAS (Conditional Access System) function which is a conditional access system that allows only a device with a viewing contract to decrypt and view metadata. A key information management unit 15 for managing information, a carousel sending unit 16 that repeatedly transmits metadata from the metadata generation unit 11, and metadata transmitted from the carousel sending unit 16 for broadcasting data such as content data Using the key information obtained from the multiplexed transmission processing unit 13 and the key information management unit 15 And an encryption processing unit 12 that encrypts metadata in the data output from the multiplexed transmission processing unit 13.

  The encryption processing unit 12 manages the TSP (transport stream packet) of the metadata to be encrypted from the TS (transport stream) output from the multiplexed transmission processing unit 13 by the key information management unit 15. The key information is encrypted using a decryption key that can be decrypted with a decryption key that is shared by the receiving apparatuses having the right to receive. At this time, the content TSP may also be encrypted.

  As a result, in a receiving apparatus that does not have the right to receive, for example, an unauthorized receiving apparatus that ignores falsification detection information and uses content using falsified metadata, the normally sent metadata is decrypted. Therefore, it is possible to prevent metadata from leaking to a receiving device that is not intended by the metadata producer. Note that the receiving device having the right to receive is a receiving device that can acquire the right to use the content through the regular route, and is equipped with a CAS function for realizing this function. As a result, the right to use the content can be distributed only to a receiving apparatus that implements a means for preventing unauthorized use after metadata recording.

  The multiplexing / transmission processing unit 13 multiplexes the content output from the content transmission unit 14 and the metadata output from the carousel transmission unit 16. By data transmission from the carousel sending unit 16, carousel transmission for repeatedly transmitting the divided TSP data portions of a plurality of blocks is executed. This makes it possible to encrypt and send metadata compatible with the conditional access system (B-CAS: BS-Conditional Access System) used to protect content used in current BS digital broadcasting. Even if a new device is not prepared for metadata encryption, metadata encryption processing can be performed using an existing content encryption device.

  Also, the encryption processing unit 12 encrypts key information for decrypting the encrypted metadata so that it can be decrypted with key information (second key information) different from the key information, and multiplex / send Along with the metadata multiplexed by the processing unit 13, metadata decryption key information encrypted with another key may be sent to the receiving device 2.

  Thus, by sending the second key information to a specific receiver, it becomes possible to control the receiver that can decrypt the metadata. For example, when charging for the reception of the metadata, it is not so. In some cases, it may be possible to distinguish key information for decrypting metadata. When charging for metadata, by distributing the key information that can be decrypted only to the receiving device that purchased the metadata using the CAS function, and encrypting the metadata using the encryption key that can be decrypted with the key, Even if it is a regular receiving apparatus, a receiving apparatus that has not performed the metadata purchase process can realize a metadata transmitting / receiving apparatus that disables decoding of the metadata.

  The receiving device 2 includes a tuner unit 20 that receives multiplexed data such as content transmitted by broadcast waves, and a TS (Transport Stream) packet that extracts TSP from the multiplexed data and separates it into content data and metadata. Filter unit 21, security module (CAS) 23 that decrypts the separated metadata and performs tampering detection check, metadata DB 25 that records metadata in which tampering is not detected, and content that records content data The data 26 and the decrypted metadata are converted into a form that can be easily used and recorded in the metadata DB 25, or the metadata processing unit 22 that extracts the metadata when necessary and confirms the validity, and the metadata. And a playback processing unit 24 that decrypts and uses the received content data. The security module 23 also includes a key processing / decryption processing unit 231 and a metadata falsification detection information calculation unit 232.

  The tuner unit 20 is an example of a receiving unit, the TS packet filter unit 21 is an example of a TSP filter unit, and the metadata processing unit 22 is a conversion unit, a first tampering detection unit, and a second tampering detection unit. The key processing / decryption processing unit 231 is an example of a metadata decryption unit and a decryption key information decryption unit, and the metadata alteration detection information calculation unit 232 includes first to third alteration detection information generation units. The metadata DB 25 is an example of a recording unit.

  The TS packet filter unit 21 separates metadata and metadata decryption key information from the multiplexed data received from the transmission system 1. The security module 23 decrypts key information that is license information for decrypting the metadata, uses the decrypted key information to perform a decryption process of the metadata, and the received meta data. A metadata falsification detection information calculation unit 232 that executes data falsification detection processing and generates metadata falsification detection information in a recording format.

  FIG. 2 is a flowchart illustrating a metadata transmission process procedure according to the first embodiment of this invention. First, when started, metadata generation processing is performed in step S1 on the transmission system 1 side. The metadata generation unit 11 extracts the metadata of the corresponding content from the information attached to the content information, and the reception device 2 generates the metadata in a recognizable format such as an XML (Extensible Markup Language) file format. Next, in step S2, the metadata generation unit 11 generates falsification detection data for the generated metadata using a hash function or the like, and adds the data to the metadata.

  Next, in step S3, the carousel transmission unit 16 converts the metadata into MPEG2-TS (Moving Picture Experts Group 2 Transport Stream) format, and in step S4, the multiplexing transmission processing unit 13 exchanges with other TSs. Multiplexed and sent out. In step S5, the metadata TS thus extracted is extracted by the encryption processing unit 12 and the corresponding TSP is encrypted. Thereafter, in step S6, the transmission ends.

  FIG. 3 is a flowchart illustrating a metadata reception process procedure according to the first embodiment of this invention. First, when started, in step S10, when the transmitted data is received by the receiving device 2, the TS packet filter unit 21 separates the data types of content data and metadata.

  The separated metadata is decrypted by the key processing / decryption processing unit 231 in the security module 23. When the encrypted metadata decryption key information is transmitted from the transmission system 1, first, the second key information is used to decrypt the metadata decryption key information, and the decryption is further performed. The received encrypted metadata is decrypted using the key information for metadata decryption.

  Next, in step S <b> 11, falsification detection information is generated by the metadata falsification detection information calculation unit 232 for the data portion obtained by decoding. Next, in step S12, the falsification detection information generated by the metadata processing unit 22 is compared with the falsification detection information in the received metadata. If they do not match (NO), in step S14. , Discard the received metadata.

  If the falsification of the metadata is not detected and is coincident with both falsification detection information (YES), in step S13, the metadata processing unit 22 records the metadata in the metadata DB 25, and the metadata. The falsification detection information in the data format recorded in the DB 25 is calculated and generated by the metadata falsification detection information calculation unit 232, recorded in association with the metadata DB 25, and the process ends.

  FIG. 4 is a flowchart for explaining content use processing using metadata according to the first embodiment of this invention. In step S20, when there is an instruction to use content using metadata in the reproduction processing unit 24, in step S21, the metadata processing unit 22 uses the metadata of the corresponding content from the metadata DB 25 and the receiving device 2. The generated falsification detection information is extracted.

  Next, in step S22, the falsification detection information calculation unit 232 calculates falsification detection information for the extracted metadata, and the metadata processing unit 22 records the falsification detection information of the extracted metadata. Compare and check the falsification detection information. If the result of the comparison check indicates that falsification is not detected and the falsification detection information matches (YES) in step S23, the metadata processing unit 22 permits the use of the content using the metadata in step S24. Then, the metadata is passed to the reproduction processing unit 24. The reproduction processing unit 24 reads the encrypted content data from the content data storage unit 26, and decrypts and reproduces the content data in each processing / decryption processing unit 231. In step S23, if the result of the comparison check indicates that they do not match (NO), in step S25, the reproduction processing unit 24 is disabled from using the content using the metadata, and the process ends.

  As described above, according to the metadata transmission system of the first embodiment of the present invention, the function of calculating the falsification detection information in the format for recording metadata in the receiving device 2 and recording it together with the metadata is provided. By providing, the metadata in the receiving device 2 can be recorded in a free format, so that the convenience in the receiving device 2 can be secured, and further, from the time of metadata recording to the time of using the content using the metadata. It becomes possible to detect falsification when the metadata is falsified, and it is possible to prevent the use of content in the falsified metadata.

  In addition, the metadata transmission system 1 has a function for encrypting metadata by adding metadata falsification detection information, and performing metadata decryption processing and falsification detection processing on the receiving device 2 side in the security module In this way, it is possible to prevent the reception of metadata by unauthorized receiving devices that are not subject to reception, and to prevent the accumulation of tampered metadata in authorized receivers that are subject to reception if the metadata is altered during transmission. It becomes possible.

(Second Embodiment)
FIG. 5 is a block diagram illustrating a configuration example of the metadata transmission system according to the second embodiment of this invention. In addition to the receiving device 2 in FIG. 1, the receiving device 3 includes an export processing unit 31 that converts metadata into an exportable format, and an encryption processing unit 233 that encrypts metadata stored in the security module 23. A receiving device with an export function. The export processing unit 31 is an example of an export processing unit.

  The receiving device 4 is a receiving device with an import function having an import processing unit 32 for recognizing and importing the exported metadata in addition to the receiving device 2 of FIG. Others include the same components as the configuration example of FIG. The import processing unit 32 is an example of import processing means.

  With this configuration, since the falsification detection function also works for the export of metadata, it can be ensured that the exported metadata is not changed from the metadata at the time of production. Moreover, you may attach the usage conditions regarding export, such as restricting metadata export in conjunction with the content usage conditions.

  FIG. 6 is a flowchart illustrating a metadata transmission processing procedure by the export function according to the second embodiment of this invention. First, when started, in step S30, the export receiving unit 3 causes the export processing unit 31 to extract metadata of the corresponding content from the metadata DB 25. Next, in step S31, for the extracted metadata, the falsification detection information is calculated by the falsification detection information calculation unit 232, and the falsification detection information recorded in the extracted metadata and the falsification detection information recorded. Check the comparison. If tampering is detected in step S32 (NO), the export process is stopped in step S34. If there is no falsification (YES), in step S33, the metadata is converted into a format that can be recognized on the import side. The format recognizable on the import side is, for example, a metadata format generated by the metadata generation unit 11 in the transmission system 1 of FIG. Next, in step S35, the metadata falsification detection information calculation unit 232 calculates and generates falsification detection information in the data format to be exported, and adds it to the metadata to be exported. Next, in step S36, the encryption processing unit 233 encrypts the metadata by a method that can be decrypted by a decryption key that is commonly provided in the receiving device 4 having the right to import metadata. Here, the encryption key used is, for example, the encryption key used in the encryption processing unit 12 of the transmission system in FIG. In step S37, the export metadata generated in this way is exported to the import-side receiving device 4 via a bridge medium, a connection cable, or wirelessly as shown by E in the figure, and ends. Of course, the corresponding contents may be exported at this time.

  FIG. 7 is a flowchart illustrating a metadata reception processing procedure by the import function according to the second embodiment of this invention. First, when started, the import side receiving device 4 receives the data exported from the receiving device 3 by the import processing unit 32 in step S40. The received metadata is decrypted by the key processing / decryption processing unit 231 in the security module 23. Next, in step S41, the falsification detection information is generated by the metadata falsification detection information calculation unit 232 for the data portion obtained by decoding. Next, in step S42, if the received falsification detection information and the recorded falsification detection information do not match (NO), the received metadata is discarded in step S44. If the falsification detection information matches without detection of falsification (YES), the metadata processing unit 22 records the metadata in the metadata DB 25 and the data recorded in the metadata DB 25 in step S43. The falsification detection information in the format is calculated and generated by the metadata falsification detection information calculation unit 232, recorded in accordance with the metadata DB 25, and the process ends.

  As described above, according to the metadata transmission system of the second exemplary embodiment of the present invention, it is possible to prevent falsified metadata from being output to the outside of the receiving apparatus by providing a falsification check function even during export processing. It becomes possible. Moreover, it is possible to prevent the metadata that has been exported by encrypting the metadata from being imported to an unauthorized receiving device that is not a reception target. In addition, by performing the falsification check process similar to that when receiving metadata from the transmission system during the import process, it is possible to prevent the falsified metadata from being recorded in the regular receiving device to be received. .

  In the above description, an example of a configuration in which metadata is transmitted using a broadcast wave has been described. However, other transmission methods such as communication can be similarly implemented.

  The metadata receiving apparatus and method of the present invention can prevent unauthorized use of metadata as a copyrighted work by performing control processing such as falsification detection, and can ensure the convenience of metadata in the receiving apparatus. This is useful for a device that receives digital content metadata in digital broadcasting and broadband distribution.

FIG. 1 is a block diagram illustrating an example of the configuration of a metadata transmission system according to a first embodiment of this invention. The flowchart explaining the procedure of the metadata transmission processing of the first embodiment of the present invention The flowchart explaining the procedure of the metadata reception process of the 1st Embodiment of this invention The flowchart explaining the content utilization process procedure using the metadata of the 1st Embodiment of this invention FIG. 6 is a block diagram illustrating an example of the configuration of a metadata transmission system according to a second embodiment of this invention. The flowchart explaining the procedure of the metadata transmission process by the export function of the 2nd Embodiment of this invention The flowchart explaining the procedure of the metadata reception process by the import function of the 2nd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission system 2 Receiving apparatus 10 Key information production | generation means 11 Metadata production | generation part 12 Encryption processing part 13 Multiplex transmission processing part 14 Content transmission part 15 Key information management part 16 Carousel transmission part 20 Tuner part 21 TS packet filter part 23 Security Module 25 metadata DB
26 Content Data 22 Metadata Processing Unit 24 Playback Processing Unit 231 Key Processing / Decryption Processing Unit 232 Tampering Detection Information Calculation Unit

Claims (8)

A metadata receiving device that receives metadata including falsification detection data related to content,
Receiving means for receiving the metadata;
Conversion means for converting the received metadata into a predetermined data format;
First falsification detection information generating means for generating falsification detection information of metadata in the converted data format;
Recording means for recording the converted metadata and the generated falsification detection information;
A second falsification detection information generating unit that reads out the converted metadata from the recording unit and generates falsification detection information of the read metadata when using the metadata;
First falsification detection means for detecting falsification by comparing the falsification detection information of metadata recorded in the recording means with the falsification detection information generated by the second falsification detection information generation means When,
A metadata receiving apparatus. The metadata receiving device according to claim 1,
Receive metadata encrypted so that it can be decrypted with the first key information,
A metadata receiving device further comprising metadata decrypting means for decrypting the encrypted metadata with first key information. The metadata receiving device according to claim 1,
Receiving metadata encrypted to be decrypted by the first key information, and the first key information encrypted to be decrypted by the second key information multiplexed on the metadata;
Decryption key information decryption means for decrypting the first key information with the second key information;
Metadata decrypting means for decrypting the encrypted metadata with the decrypted first key information;
A metadata receiving device further comprising: The metadata receiving device according to claim 2 or 3,
As the encrypted metadata, a signal in which the data portion of the TSP is encrypted after being divided into TSP (Transport Stream Packet) which is a minimum unit constituting the transport stream is received,
TSP filter means for extracting TSP from the received signal is further provided,
The metadata decryption unit is a metadata reception device that decrypts encrypted data in the extracted TSP using first key information. The metadata receiving device according to any one of claims 1 to 4, wherein
Receiving the falsification detection data of the received metadata;
Third falsification detection information generating means for generating falsification detection information for the received metadata;
A second falsification detecting means for detecting falsification by comparing the received falsification detection data with the generated falsification detection information;
A metadata receiving device further comprising: The metadata receiving device according to any one of claims 1 to 5,
It further comprises an export processing means for encrypting and exporting the metadata to another metadata receiving device,
The second falsification detection information generation unit reads out the exported metadata from the recording unit and generates the falsification detection information of the read metadata when the export processing unit exports the metadata. And
The first falsification detection unit compares the metadata falsification detection information recorded in the recording unit with the falsification detection information generated by the second falsification detection information generation unit and performs falsification. Metadata receiving device to detect. The metadata receiving device according to any one of claims 1 to 6,
A metadata receiving apparatus further comprising import processing means for importing metadata from another metadata receiving apparatus. A metadata receiving method for receiving metadata about content,
Receiving the metadata;
Converting the received metadata into a predetermined data format;
Generating metadata falsification detection information in the converted data format;
Recording the converted metadata and the generated falsification detection information in a recording unit;
Reading the metadata to be used from the recording means when using the metadata, and generating falsification detection information of the read metadata;
Comparing the falsification detection information of the metadata recorded in the recording means with the generated falsification detection information to detect falsification;
A method for receiving metadata.

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