KR20070105273A - Apparatus and method for transforming drm algorithm of streaming data - Google Patents

Abstract

A device and a method for changing a DRM algorithm of streaming data are provided to enable various DRM client terminals to use a streaming service encoded through various DRMs freely by changing the DRM algorithm stored in the streaming data into a different DRM algorithm if necessary. A plurality of parsers with an N-level receive and parse the streaming data. The plurality of packetizers with the N-level generate the streaming data by packetizing the parsed streaming data. A decoder decodes the data encoded by the n-th level parser among the N parsers according to a first DRM algorithm by connecting to the n-th parser. An encoder encodes the decoded data according to a second DRM algorithm by connecting to the m-th level packetizer among the N packetizers. A path manager manages a path based on m and n to enable the streaming data to be parsed/packetized by the minimum number of parsers and packetizers.

Description

Apparatus and Method for transforming DRM algorithm of Streaming Data

1 is a block diagram showing an apparatus for changing a DRM algorithm for download data in the prior art.

2 is a block diagram of an embodiment of an apparatus for changing a DRM algorithm according to the present invention;

3 is a diagram illustrating a detailed embodiment of the DRM changer in FIG. 2;

4 is a diagram illustrating an embodiment of a DRM change unit of MPEG-2 streaming data.

FIG. 5 is a diagram illustrating a detailed embodiment of the DRM changer in FIG. 2; FIG.

6 is a flowchart of a method of changing a DRM algorithm of streaming data according to FIG. 2;

The present invention relates to an apparatus and method for changing a DRM algorithm, and more particularly, to an apparatus and method for changing a DRM algorithm for changing a DRM algorithm applied to streaming data into another DRM algorithm.

Digital Rights Management (DRM) is a protection technology for the safe distribution, illegal copying and unauthorized use of digital content distributed through the network.

For example, data provided from a content provider (including content data) is subject to a certain DRM algorithm (e.g., a DRM1 algorithm), while a user terminal consuming the data does not support the DRM1 algorithm and other DRM algorithms (e.g., In the case of supporting only the DRM2 algorithm, it is necessary to change the DRM1 algorithm applied to the data to the DRM2 algorithm while the data is distributed (downloaded or streamed) through the network.

1 is a block diagram showing a conventional DRM algorithm change apparatus for download data.

As shown in FIG. 1, the conventional DRM algorithm changing method for download data includes a DRM1 decryption unit 101 and a DRM2 encryption unit 103.

The DRM1 decryption unit 101 decrypts the data C1 encrypted by the DRM1 algorithm and converts the data C1 into original data C0.

The DRM2 encryption unit 103 encrypts the original data C0 converted from the DRM1 decryption unit 101 by the DRM2 algorithm, and converts the original data C0 into encrypted data C2.

As described above, according to the related art of applying DRM to the downloadable data, the output of the decryption unit (for example, the decryption unit 101 of FIG. 1) is an encryption unit (for example, the encryption unit 103 of FIG. 1). It is easy to change the DRM algorithm (e.g., DRM1 in FIG. 1) applied to the downloadable data to another DRM algorithm (e.g., DRM2 in FIG. 1).

However, streaming data, unlike downloadable data, is not easy to change the DRM algorithm. The streaming data is data generated through a plurality of packetizing processes and restored to original data through a plurality of parsing processes.

For example, in the case of MPEG-2, MPEG-2 ES (Elementary Stream) is generated when packetizing original data (video signal and audio signal) in step 1, and MPEG-2 ES (Elementary Stream) in step 2 Packetize the packetized element stream (PES), and packetize the packetized element stream (PES) in step 3 to generate the MPEG-2 TS (Transport Stream). Packetizing the stream generates network packet data (UDP, RTP packets). Parsing the network packet data (UDP, RTP packet) in the reverse order finally generates the original data.

The DRM algorithm applied to the streaming data may encrypt and decrypt intermediate data (eg, ES, PES, TS, etc.) generated during some of the plurality of packetizing / parsing processes. Is performed.

The problem is that the intermediate data that is subject to DRM encryption and decryption depends on the DRM algorithm. That is, in the case of streaming data, unlike in the case of downloadable data, the output of the decoding unit according to the first DRM algorithm (in the above example, if DRM1 is applied in step 2, the output is in the form of PES), It cannot be used as the input of the encryption part (in the example above, the input is TS form if DRM2 is applied in step 3).

Of course, similar to the technique of changing the DRM algorithm for the downloadable data, all parsing and DRM1 decryption are performed to restore the original data, and then all packetizing and DRM2 encryption are applied to the streaming data. It is possible to change the DRM algorithm.

However, the process of performing all parsing processes for streaming data and changing all packetizing processes again for the DRM change is inefficient, and it is not preferable in that the process is not necessary for the DRM algorithm change.

Therefore, in the case of streaming data, a DRM algorithm change technique that is different from a DRM algorithm change technique applied to downloadable data is required.

SUMMARY OF THE INVENTION The present invention has been proposed to meet the above demands, and an object thereof is to provide an apparatus and method for changing a DRM algorithm of streaming data by freely changing a DRM algorithm stored in the streaming data as necessary.

According to an aspect of the present invention, there is provided a DRM change apparatus for converting a first DRM algorithm applied to streaming data into a second DRM algorithm, comprising: N levels of parsing means for receiving and parsing the streaming data; The N levels of packetizing means for packetizing the data parsed by the parsing means to generate the streaming data; Decoding means connected to an nth level (n is an integer less than or equal to N) parsing means of the N level parsing means for decoding data parsed by the nth level parsing means according to the first DRM algorithm; Encryption means for encrypting data decrypted by said decrypting means in accordance with said second DRM algorithm, connected to a packetizing means of an mth level (m is an integer equal to or less than N) of said N level packetizing means; And a path management means for managing a path such that the streaming data is parsed and packetized by a minimum number of the parsing means and the packetizing means based on the n and m values.

According to an aspect of the present invention, there is provided a DRM change method for converting a first DRM algorithm applied to streaming data into a second DRM algorithm, comprising: N levels of parsing for receiving and parsing the streaming data; Packetizing the N levels to generate the streaming data by packetizing the data parsed by the parsing step; A decoding step of decoding data parsed by an nth level (n is an integer less than or equal to N) among the N levels of parsing according to the first DRM algorithm; Data decrypted by the decryption step such that data encrypted according to the second DRM algorithm is packetized by a packetizing step of an mth level (m is an integer less than or equal to N) of the N level packetizing steps Encrypting the data according to the second DRM algorithm; And a path management step of parsing and packetizing the streaming data by the minimum number of parsing and packetizing steps based on the n and m values.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an embodiment of an apparatus for changing a DRM algorithm according to the present invention.

As shown in FIG. 2, the apparatus for changing a DRM algorithm according to an embodiment of the present invention includes a recognizer 201, a parsing-packetizing manager 203, a DRM manager 205, a path manager 207, And a DRM change unit 209.

The recognition unit 201 is the format information of the streaming data input and output to the DRM changing apparatus according to the present invention, the DRM algorithm (DRM1 algorithm) information applied to the streaming data, and the DRM algorithm (DRM2 algorithm) to be changed. Recognize the information. The streaming format information and the DRM algorithm information may be obtained through various routes. For example, it may be obtained directly from an administrator or a user, may be obtained from a content provider system or a user terminal through a query, or may be directly obtained from information included in streaming data (eg, header information). have.

The parsing-packetizing manager 203 stores and manages parsers and packetizers according to various streaming formats (eg, MPEG-2, Internet Streaming Media Alliance (ISMA)), and recognizes the packet recognizer 201. A corresponding parser and packager are provided based on the streaming format information recognized by the user.

The DRM manager 205 stores and manages decoders and encoders according to various DRM algorithms, and provides a DRM1 decoder and DRM2 encoder according to the DRM algorithm information recognized by the recognizer 201.

The DRM1 decoder decrypts the streaming data by the DRM1 algorithm during some parsing of a plurality of parsing processes in which the streaming data (encrypted by the DRM1 algorithm) inputted to the DRM changing unit 209 is parsed. The streaming data is encrypted by the DRM2 algorithm in some packetizing processes of packetizing the streaming data decrypted by the DRM1 decoder as the streaming data received from the parser.

For example, in the MPEG-2 format, User Datagram Protocol (UDP) is parsed into a transport stream (TS), TS is parsed into a packetized element stream (PES), PES is parsed into an elementary stream (ES), ES is parsed as original data. At this time, the DRM1 decoder can decrypt UDP by the DRM1 algorithm, and the DRM2 encryptor can encrypt the PES by the DRM2 algorithm.

On the other hand, the DRM manager 205 outputs the provided DRM1 decoder and DRM2 encryptor information to the path manager 207. The DRM1 decoder information is information on which intermediate data (eg, ES, PES, TS, etc.) of the DRM1 decoder is output during a plurality of parsing processes, for decoding. The DRM2 encryptor information is information on which intermediate data among the intermediate data output during the plurality of packetizing processes is encrypted by the DRM2 encryptor. The DRM encryption process and the decryption process linked to the parsing and packetizing process for each streaming format are determined by the DRM algorithm.

The path manager 207 is configured to provide a DRM1 decoder and a DRM2 encoder provided from the DRM manager 205 to change the DRM algorithm applied to the streaming data while parsing the streaming data into the intermediate data without parsing the streaming data up to the original data. Based on the information of the parser, the parser generates information on which state the intermediate data should be delivered to the packetizer, that is, route information. Path information generation is described later.

The DRM changing unit 209 is a parser and a packetizer provided from the parsing-packetizing manager 203, and includes a plurality of parsers for performing a plurality of parsing processes and a plurality of packets for performing a plurality of packetizing processes. It includes a packetizer of. In addition, the DRM1 decoder and the DRM2 encryptor provided from the DRM management unit 205 are combined with some of the plurality of parsers and some of the packetizers of the plurality of packetizers, respectively.

Since the DRM encryption process and the decoding process linked to the parsing and packetizing process for each streaming format are determined by a DRM algorithm, it is determined whether the DRM1 decoder is combined with a plurality of parsers among the plurality of parsers. It is determined according to which intermediate data among intermediate data to be outputted is decoded. Similarly, which packetizer of the plurality of packetizers is combined with the DRM2 encryptor depends on which intermediate data of the intermediate data output during the plurality of packetizing processes is encrypted. Is determined.

Further, in the DRM changing unit 209, intermediate data suitable for being encrypted by the DRM2 encoder as intermediate data decrypted by the DRM1 decoder based on the path information generated by the path management unit 207 are provided. From the parser of the parser that calculates the intermediate data, the intermediate data is transferred to a corresponding packetizer capable of packetizing the intermediate data.

Accordingly, the streaming data encrypted by the DRM1 algorithm, which is input to the DRM changing unit 209, is partially parsed by the plurality of parsers according to the path information generated by the path management unit 207 and the DRM1. After decrypted by the decoder, it is delivered to the corresponding packetizer, packetized again, and encrypted and output by the DRM2 encryptor. Thus, the DRM algorithm applied to the streaming data is changed from DRM1 to DRM2.

FIG. 3 is a detailed block diagram of the DRM changing unit 209 in FIG. 2.

As shown in FIG. 3, the DRM changing unit 209 may include a plurality of parsers (parser 1, parser 2, ..., parser Npar, ..., provided from the parsing-packaging management unit 203). Parser N) and a plurality of packetizers (Packetizer 1, Packetizer 2, ..., Packetizer Npac, ..., Packetizer N). Streaming data that is not considered DRM is parsed into original data through N parsers, and the original data is packetized into streaming data through N packetizers. In general, since the parsing (reverse packetizing) process and the packetizing process are performed in reverse order, the number N of parsers and the number N of packetizers are the same.

In short, N parsers parsing streaming data from original data are sequentially parsing the streaming data, and since each of the N packetizers corresponds to each of the N level parsers, N parsers and packet tie are provided. Can be represented by me.

 Meanwhile, the embodiment shown in FIG. 3 is a case in which a DRM1 decoder is coupled to an Nparth parser among N parsers, and a DRM2 coder is coupled to an Npac th packetizer among N packetizers, where Npar is smaller than Npac. The case is shown. Here, Npar refers to the Npar-th level when sequentially parsing a parser parsed from the streaming data into the original data, and Npac refers to the Npac-th level.

Streaming data encrypted by the DRM1 algorithm, which is input to the DRM changing unit 209, is parsed until the parsing process performed by the Npar-th parser.

After parsing the Npar-th parser, the Npar-th parser passes intermediate data on which the Npar-th parsing is performed to the DRM1 decoder. The DRM1 decoder performs decoding on the intermediate data received from the Npar-th parser according to the DRM1 algorithm, and returns the decoded intermediate data to the Npar-th parser. As a result, the streaming data is decrypted according to the DRM1 algorithm.

The intermediate data decoded according to the DRM1 algorithm, returned from the DRM1 decoder to the Npar-th parser, is parsed up to a parsing process performed by the parser corresponding to the Npac-th packetizer, that is, the Npac-th parser.

After the Npac-th parser performs parsing, the Npac-th parser delivers the intermediate data on which the Npac-th parsing is performed to the corresponding packetizer, that is, the Npac-th packetizer.

The reason that the Npac-th parser can deliver intermediate data to the Npac-th packetizer is because of the path information generated by the path manager 207.

The path manager 207 extracts Npar from the information of the DRM1 decoder provided from the DRM manager 205 by deciding which intermediate data among the intermediate data output from the plurality of parsing processes is decoded.

In addition, the path manager 207 confirms which intermediate data among the intermediate data output from the plurality of packetizing processes is encrypted from the information of the DRM2 encryptor provided from the DRM management unit 205 to Npac. Extract

In addition, the path manager 207 compares the extracted Npar and Npac to generate path information so that intermediate data generated from a parser having a larger variable is transferred to a corresponding packetizer.

As a generalized case, the path management unit 207 transfers the path information so that the Ntr-th parsing means of the plurality of parsing means delivers the data decrypted by the decoding means to the Ntr-th packetizing means corresponding to the Ntr-th parsing means. When Npar is smaller than Npac as shown in FIG. 3, Ntr is equal to Npac.

3 shows that Npar is less than Npac, the path manager 207 is based on information of the DRM1 decoder and DRM2 encoder provided from the DRM manager 205, and the Npac-th parser is Npac. Path information may be generated to transmit the intermediate data on which the first parsing is performed to the corresponding packetizer, that is, the Npac-th packetizer, and the Npac-th parser may deliver the intermediate data to the Npac-th packetizer according to the path information.

The Npac-th parsed intermediate data, passed from the Npac-th parser to the Npac-th packetizer, is transferred to the DRM2 encryptor, and the DRM2 encryptor performs encryption according to the DRM2 algorithm on the intermediate data where the Npac-th parsed is performed. The encrypted data is returned to the Npac th packetizer. The streaming data is thus encrypted according to the DRM2 algorithm.

Packetizing is again performed on intermediate data encrypted according to the DRM2 algorithm, which is returned from the DRM2 encoder to the Npac-th packetizer.

FIG. 4 is a diagram illustrating an embodiment of a DRM changer of MPEG-2 streaming data, and illustrates a case where streaming data is in MPEG-2 format.

As shown in FIG. 4, the DRM changing unit 209 includes four parsers (parser 1, parser 2, parser 3, and parser 4) and four packetizers (packetizer 1, packetizer 2, and packet). A riser 3 and a packetizer 4). Parser 1 (401) parses User Datagram Protocol (UDP) into a transport stream (TS), parser 2 403 parses TS into a packetized element stream (PES), and parser 3 (407) parses PES into ES ( Parse 4 parses the ES into original data (eg, video signal, audio signal). Packetizer 1 (415) packetizes TS to UDP, Packetizer 2 (413) packetizes PES to TS, Packetizer 3 (409) packetizes ES to PES Packetizer 4 packetizes the original data to the ES.

The four parsers and four packetizers are provided by the parsing-packetizing management unit 203 by the streaming format information (MPEG-2) recognized by the recognition unit 201.

On the other hand, in the embodiment shown in Figure 4 is a DRM1 decoder 405 is coupled to parser 2 (403) of the four parsers, DRM2 encoder 411 to the packetizer 3 (409) of the four packetizers Are combined.

The DRM1 decoder 405 and the DRM2 encryptor 411 are provided by the DRM management unit 205 by the DRM algorithm information recognized by the recognition unit 201.

Streaming data encrypted by the DRM1 algorithm, which is input to the DRM changing unit 209, is parsed until a parsing process performed by the parser 2 403.

The parser 2 403 performs parsing, and then transfers the PES on which the second parsing is performed, to the DRM1 decoder 405. The DRM1 decoder 405 performs decoding on the PES received from the parser 2 403 according to the DRM1 algorithm, and returns the decoded PES to the parser 2 403. As a result, the streaming data is decrypted according to the DRM1 algorithm.

The PES returned from the DRM1 decoder 405 to the parser 2 403 is parsed up to the parsing process performed by the parser corresponding to the packetizer 3 409, that is, the parser 3 407.

Parser 3 (407) performs parsing, and then delivers the third parsed ES to the corresponding packetizer, that is, packetizer 3 (409).

The parser 3 407 can deliver the ES to the packetizer 3 409 because of the path information generated by the path manager 207.

The path manager 207 checks whether the DRM1 decoder 405 performs decoding on the intermediate data PES output from a plurality of parsing processes from the information of the DRM1 decoder provided from the DRM manager 205.

In addition, the path manager 207 checks whether the DRM2 encryptor 411 performs encryption on the intermediate data ES output from the plurality of packetizing processes, based on the information of the DRM2 encryptor provided from the DRM manager 205.

The path management unit 207, based on the information of the DRM1 decoder 405 and the DRM2 encryptor 411 provided from the DRM management unit 205, the parser 3 (407) corresponding to the ES that the third parsing is performed. The path information is generated to be transmitted to the riser, that is, the packetizer 3 (409), and the parser 3 (407) can deliver the intermediate data ES to the packetizer 3 (409) according to the path information.

The third parsed ES is transferred to the DRM2 encryptor 411, and the DRM2 encryptor 411 performs encryption according to the DRM2 algorithm on the third parsed ES, and then encrypts the encrypted data with the packetizer3. Return to (409). The streaming data is thus encrypted according to the DRM2 algorithm.

The ES encrypted according to the DRM2 algorithm, returned from the DRM2 encryptor 411 to Packetizer 3 (409), is generated as final streaming data through packetizing.

FIG. 5 is a detailed configuration diagram of the DRM changing unit 209 in FIG. 2, which is the same as the embodiment illustrated in FIG. 3 except that Npar is larger than Npac.

As a generalized case, the path management unit 207 transfers the path information so that the Ntr-th parsing means of the plurality of parsing means delivers the data decrypted by the decoding means to the Ntr-th packetizing means corresponding to the Ntr-th parsing means. When Npar is greater than Npac as shown in FIG. 5, Ntr is equal to Npar.

Streaming data encrypted by the DRM1 algorithm, which is input to the DRM changing unit 209, is parsed until the parsing process performed by the Npar-th parser.

After parsing the Npar-th parser, the Npar-th parser passes intermediate data on which the Npar-th parsing is performed to the DRM1 decoder. The DRM1 decoder performs decoding on the intermediate data received from the Npar-th parser according to the DRM1 algorithm, and returns the decoded intermediate data to the Npar-th parser. As a result, the streaming data is decrypted according to the DRM1 algorithm.

After parsing the Npar-th parser, the Npar-th parser delivers the intermediate data on which the Npar-th parsing is performed to the corresponding packetizer, that is, the Npar-th packetizer.

The Npar-th parser can deliver intermediate data to the Npar-th packetizer because of the path information generated by the path manager 207.

The path manager 207 extracts Npar from the information of the DRM1 decoder provided from the DRM manager 205 by deciding which intermediate data among the intermediate data output from the plurality of parsing processes is decoded.

In addition, the path manager 207 confirms which intermediate data among the intermediate data output from the plurality of packetizing processes is encrypted from the information of the DRM2 encryptor provided from the DRM management unit 205 to Npac. Extract

In addition, the path manager 207 compares the extracted Npar and Npac to generate path information so that intermediate data generated from a parser having a larger variable is transferred to a corresponding packetizer.

In an embodiment illustrated in FIG. 5, when Npar is larger than Npac, the path manager 207 may use the Npar-th parser as the Npar based on the information of the DRM1 decoder and the DRM2 encoder provided from the DRM manager 205. Path information is generated to deliver the intermediate data on which the first parsing is performed to the corresponding packetizer, that is, the Npar-th packetizer, and the Npar-th parser can deliver the intermediate data to the Npar-th packetizer according to the path information.

Npar-parsed intermediate data transferred from the Npar-th parser to the Npar-th packetizer is packetized until the packetizing process performed in the Npac-th packetizer.

Intermediate data that has been packetized until the packetizing process performed by the Npac th packetizer is transferred to the DRM2 encryptor, and the DRM2 encryptor has performed packetizing until the packetizing process performed by the Npac th packetizer. After encrypting the intermediate data according to the DRM2 algorithm, the encrypted data is returned to the Npac-th packetizer. The streaming data is thus encrypted according to the DRM2 algorithm.

The DRM2 encryptor performs encryption according to the DRM2 algorithm on the intermediate data on which packetizing is performed until the packetizing process performed in the Npac th packetizer, and then converts the encrypted data into the Npac th packet tie. Return to me. The streaming data is thus encrypted according to the DRM2 algorithm.

Packetizing is again performed on intermediate data encrypted according to the DRM2 algorithm, which is returned from the DRM2 encoder to the Npac-th packetizer.

6 is a flowchart of a method of changing a DRM algorithm of streaming data according to FIG. 2.

As illustrated in FIG. 6, the recognizer 201 recognizes a streaming format and each DRM algorithm of a DRM1-based streaming service and a DRM2-based streaming service to be changed (601).

The parsing-packetizing manager 203 stores and manages parsers and packetizers according to various streaming formats (eg, MPEG-2 and ISMA), and the streaming format information recognized by the recognizer 201. A corresponding parser and packager is provided based on 603.

The DRM manager 205 provides the provided DRM1 decoder and DRM2 encoder information (607).

The path management unit 207, based on the information of the DRM1 decoder and the DRM2 encryptor provided from the DRM management unit 205, information on which state the intermediate data should be transmitted to the packetizer, that is, the path Generate information (607).

Streaming data, which is encrypted by the DRM1 algorithm, inputted to the DRM changing unit 209, is partially parsed by the plurality of parsers according to the path information generated by the path management unit 207, and is then transmitted to the DRM1 decoder. After decryption (609), it is forwarded to the corresponding packetizer and packetized again, and then encrypted and output by the DRM2 encryptor (611). Thus, the DRM algorithm applied to the streaming data is changed from DRM1 to DRM2.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention has an effect that a streaming service encrypted with various DRMs can be freely used in various DRM client terminals.

On the data provider's side, it is possible to provide data regardless of the user's DRM system without disclosing its own DRM system, and it is not necessary to apply DRM in various formats to the data, thereby generating more profits and reducing costs. It works.

From the user's perspective, if you acquire the right to use without installing a new DRM client, you can use the data you want regardless of DRM. In addition, once a user purchases a right to use the data, the data can be transferred to various terminals and played back. Therefore, even if different DRM clients are installed, the user does not need to purchase a new right by paying a double cost. .

Claims (16)

In the DRM change device for changing the first DRM algorithm applied to the streaming data to the second DRM algorithm, N levels of parsing means for receiving and parsing the streaming data; The N levels of packetizing means for packetizing the data parsed by the parsing means to generate the streaming data; Decoding means connected to an nth level (n is an integer less than or equal to N) parsing means of the N level parsing means for decoding data parsed by the nth level parsing means according to the first DRM algorithm; Encryption means for encrypting data decrypted by said decrypting means in accordance with said second DRM algorithm, connected to a packetizing means of an mth level (m is an integer equal to or less than N) of said N level packetizing means; And Path management means for managing a path such that the streaming data is parsed and packetized by a minimum number of the parsing means and the packetizing means based on the n and m values DRM change device comprising a. The method of claim 1, The route management means Allow the streaming data to be parsed and packetized by parsing means and packetizing means corresponding to the level of the larger value of the n and m values. DRM change device. The method of claim 1, The nth level is Determined based on the first DRM algorithm, The mth level Determined based on the second DRM algorithm DRM change device. The method of claim 1, Recognition means for recognizing streaming format information of the streaming data DRM change device further comprising. The method of claim 4, wherein Parsing-packetizing management means for storing parsing means and packetizing means according to various streaming formats More, The N levels of parsing means and packetizing means Provided by the parsing-packetizing management means based on the streaming format information recognized by the recognition means. DRM change device. The method of claim 1, Recognition means for recognizing the first DRM algorithm and the second DRM algorithm information DRM change device further comprising. The method of claim 6, DRM management means for storing encryption means and decryption means according to various DRM algorithms More, Decryption means and encryption means of the DRM change device Provided by the DRM management means based on the first DRM algorithm and the second DRM algorithm information recognized by the recognition means among encryption means and decryption means stored by the DRM management means. DRM change device. The method of claim 7, wherein The route management means Generating the path information based on the information of the decryption means and encryption means provided by the DRM management means; DRM change device. In the DRM change method for changing the first DRM algorithm applied to the streaming data to the second DRM algorithm, N levels of parsing to receive and parse the streaming data; Packetizing the N levels to generate the streaming data by packetizing the data parsed by the parsing step; A decoding step of decoding data parsed by an nth level (n is an integer less than or equal to N) among the N levels of parsing according to the first DRM algorithm; Data decrypted by the decryption step such that data encrypted according to the second DRM algorithm is packetized by a packetizing step of an mth level (m is an integer less than or equal to N) of the N level packetizing steps Encrypting the data according to the second DRM algorithm; And A path management step of causing the streaming data to be parsed and packetized by a minimum number of the parsing and packetizing steps based on the n and m values DRM change method comprising a. The method of claim 9, The path management step Allow the streaming data to be parsed and packetized by a parsing step and a packetizing step corresponding to a level of a larger value among the n and m values. How to change DRM. The method of claim 9, The nth level is Determined based on the first DRM algorithm, The mth level Determined based on the second DRM algorithm How to change DRM. The method of claim 9, A recognition step of recognizing a streaming format of the streaming data DRM change method further comprising. The method of claim 12, The N levels of parsing and packetizing Specified based on the streaming format information recognized by the recognition step How to change DRM. The method of claim 9, Recognizing step of recognizing the first DRM algorithm and the second DRM algorithm information DRM change method further comprising. The method of claim 14, The decryption step and the encryption step Specified based on the first DRM algorithm and second DRM algorithm information recognized by the recognition step How to change DRM. The method of claim 15, The path management step Generating the path information based on the decryption step and the encryption step specified based on the first DRM algorithm and the second DRM algorithm information; How to change DRM.

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