KR101098762B1 - Method and apparatus of providing contents list - Google Patents

Abstract

The present invention provides a method of providing a contents list, wherein at least one of metadata and a license key ID is extracted from a header of a content file, and at least one of the extracted metadata and the extracted license key ID is provided. If one is stored in the database and the content file is a file protected by DRM (digital rights management) technology, the license file ID is used to retrieve the license from the license file to obtain DRM information for the content file, and the stored metadata And a content list including at least one of the obtained DRM information.

Description

Method and apparatus for providing a list of contents {Method and apparatus of providing contents list}

The present invention relates to digital rights management (DRM), and more particularly, to a method and apparatus for providing a list of contents protected by DRM technology.

DRM technology is a technology that continuously manages and protects the rights of intellectual property of digital contents by using encryption technology. In other words, DRM technology is a technology for securely delivering various contents from a content provider to a user, and preventing the user who receives the contents from being illegally distributed. DRM technology protects information throughout the entire process of creating, distributing, using, and disposing of digital content, and protects the rights and uses of users' rights, both online and offline.

SUMMARY OF THE INVENTION Problems to be Solved by the Invention The present invention provides a method and apparatus for providing a content list capable of improving the speed of retrieving a content list, a computer-readable recording medium recording a program for executing the content list providing method, and providing the content list. It is to provide a content reproduction apparatus including a device.

According to another aspect of the present invention, there is provided a method for providing a content list, the method including: extracting at least one of metadata and a license key ID from a header of a content file; Storing at least one of the extracted metadata and the extracted license key ID in a database; If the content file is a file protected by DRM technology, retrieving a license from a license file using the stored license key ID to obtain DRM information about the content file; And providing a user with a content list including at least one of the stored metadata and the obtained DRM information.

The task may also include extracting at least one of metadata and a license key ID from a header of a content file; Storing at least one of the extracted metadata and the extracted license key ID in a database; If the content file is a file protected by DRM technology, retrieving a license from a license file using the stored license key ID to obtain DRM information about the content file; And providing a content list including at least one of the stored metadata and the obtained DRM information to a user. The method may be achieved by a computer-readable recording medium having recorded thereon a program for executing the content list providing method. .

In addition, the content list providing apparatus according to the present invention for solving the above problems is a storage unit for storing a content file and a license file; A header parser which parses a header of the content file and extracts at least one of metadata and a license key ID; A database for storing at least one of the extracted metadata and the extracted license key ID; A search unit for obtaining DRM information on the content file by searching for a license in the license file using the stored license key ID when the content file is a file protected by a DRM technology; And a display unit for providing a user with a content list including at least one of the stored metadata and the obtained DRM information.

In addition, the content reproduction apparatus according to the present invention for solving the above problems storage unit for storing the content file and the license file; A header parser which parses a header of the content file and extracts at least one of metadata and a license key ID; A database for storing at least one of the extracted metadata and the extracted license key ID; A search unit for obtaining DRM information on the content file by searching for a license in the license file using the stored license key ID when the content file is a file protected by a DRM technology; A display unit providing a user with a content list including at least one of the stored metadata and the obtained DRM information; A decryption unit to decrypt the contents using the license; And a playback unit for playing the decrypted content.

According to the present invention, metadata and license key IDs are extracted by parsing the header of a content file protected with DRM technology, and the extracted metadata and license key IDs are stored in a database, so that the database is later provided when the content list is provided. DRM information may be obtained using the stored license key ID. Accordingly, when providing the content list, it is not necessary to access the content file and parse the header of the content file in order to extract the license key ID, thereby improving the speed of retrieving the content list.

In addition, by parsing the header, the extracted license key ID is converted into binary data, and the converted license key ID is stored in a database, thereby reducing the amount of memory allocated to store the license key ID.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a block diagram schematically illustrating a communication system according to an embodiment of the present invention.

Referring to FIG. 1, the communication system 1 includes first and second terminals 10 and 20, a host 30, a communication network 40, and a server 50. The first and second terminals 10 and 20 receive a content file and a license file provided from the server 50 and supply them to the user. Here, the first and second terminals 10 and 20 may be portable devices such as a mobile phone, an MP3 player, personal digital assistants (PDA), a portable multimedia player (PMP), and the like.

The second terminal 20 receives a content file and a license file directly from the server 50 through the communication network 40 in an OTA (on the air) manner. Here, the communication network 40 may be a wired or wireless network. Meanwhile, the first terminal 10 receives a content file and a license file stored in the host 30 in a sideloading manner. Specifically, the first terminal 10 provides a content file and a license file through the universal serial bus (USB) from the host 30 according to, for example, a media transfer protocol (MTP) that is a standard for transferring media files. Receive. Here, the host 30, like the second terminal 20, directly receives a content file and a license file from the server 50 through the communication network 40.

2 is a block diagram illustrating the first terminal of FIG. 1 in more detail. Referring to FIG. 2, the first terminal 10 includes an input unit 11, a header parser 12, a converter 13, Database 14, storage 15, searcher 16, display 17, decoder 18 and playback 19. Hereinafter, an operation of each block included in the first terminal 10 will be described in detail, and a method of providing a content list in the first terminal 10 will be described in detail. However, the technical concept of the present invention is not only the first terminal 10 receiving the content file and the license file in a sideloading manner, but also the second terminal 20 and the host 30 receiving the content file and the license file in an OTA manner. Can also be applied.

The input unit 11 receives at least one of a content file and a license file transmitted from the server 30. Here, the content file is a file that stores content (for example, audio / video) to be played, and the content may be paid content protected by DRM technology or free content not protected by DRM technology. In addition, the license file is an encrypted file that stores a plurality of licenses, and the license represents a public key-based certificate that includes a content key capable of decrypting DRM information and paid content protected by DRM technology. In addition, the DRM information indicates the usage right, the number of times, the available period of use of the content protected by the DRM technology.

When the content file is a file protected by the DRM technology, the input unit 11 receives the content file and the license file. At this time, the content file and the license file may be input to the input unit 11 at the same time, or may be input to the input unit 11 with a time difference. On the other hand, if the content file is not a file protected by the DRM technology, the input unit 11 may receive only the content file without a separate license file. Here, the content file and the license file may be input according to the MTP.

The header parsing unit 12 parses the header of the content file input to the input unit 11 and extracts metadata from the header. Here, the metadata is attribute information about various data stored in the content file, and the location and contents of the various data stored in the content file, information on the creator, usage conditions, usage history, and the like are recorded. In addition, when the content file input to the input unit 11 is a file protected by the DRM technology, the header parsing unit 12 further extracts the license key ID from the header by parsing the header of the content file. Here, the license key ID indicates an identification value for searching for a corresponding license in a license file in which a plurality of licenses are stored.

The converting unit 13 converts the license key ID extracted from the header parsing unit 12 into binary data. At this time, the conversion unit 13 may reduce the size of the license key ID by converting the extracted license key ID into a binary data. For example, the license key ID composed of a string may have a size of up to 24 bytes, and the license key ID converted into binary data may have a size of up to 16 bytes. As a result, the size of memory allocated to storing the license key ID can be reduced, and the search speed can be improved.

In detail, the conversion unit 13 may perform base64 decoding on the extracted license key ID to convert the license key ID formed of a character string into binary data. In this case, base64 decoding means that the base64 encoded string is interpreted as 6 bits of binary data per character to produce an 8-bit array (binary data). In other words, base64 encoding converts 256 to 64 digits, and base64 decoding converts 64 to 256 digits. However, the present invention is not limited thereto, and the conversion unit 13 may convert the license key ID using another conversion method.

The database 14 stores at least one of metadata and license key ID. In one embodiment of the present invention, the first terminal 10 may include a conversion unit 13, the database 14 is the extracted metadata and the license key converted into binary data in the conversion unit 13 You can save the ID. On the other hand, in another embodiment of the present invention, the first terminal 10 may not include the conversion unit 13, the database 14 may store the license key ID consisting of the extracted metadata and character string. .

The storage unit 15 includes a license file storage unit 151 and a content file storage unit 152. The license file storage unit 151 receives and stores a license file from the input unit 11, and the content file storage unit 152 receives and stores a content file from the input unit 11.

When the content file is a file protected by DRM technology, the search unit 16 searches for a license in the license file stored in the license file storage unit 151 using the license key ID stored in the database 14. Obtain DRM information.

The display unit 17 provides the user with a content list including at least one of metadata stored in the database 14 and DRM information obtained from the searcher 16. Specifically, the display unit 17 may be implemented as a graphical user interface (GUI) for implementing an interface between the user and the first terminal 10 through a graphic.

For example, when the content file is a file protected by the DRM technology, the display unit 17 may indicate that the file is protected by the DRM technology by using a lock display based on the obtained DRM information. In addition, when the content file is a file protected by the DRM technology, the display unit 17 may add the usage right, the number of times, the available period of the file to the content list based on the obtained DRM information. Meanwhile, the display unit 17 may add only metadata to the content list when the content file is not a file protected by the DRM technology.

When a user wants to search or play content stored in the first terminal 10, the user may select desired content by searching a list of contents stored in the first terminal 10. When the content file is not a file protected by the DRM technology, the display unit 17 provides the user with a content list including metadata stored in the database 14. On the other hand, if the content file is a file protected by DRM technology, the display unit 17 may display a content list including DRM information indicating that the file is a file protected by DRM technology as well as metadata stored in the database 14. Should be provided to

When a conventional terminal receives a content list retrieval request from a user, the terminal extracts a license key ID by parsing a header of the content file by accessing the content file, and retrieves a license from the license file using the extracted license key ID. Obtained. However, in recent years, as the storage capacity of the terminal has increased, the number of contents that can be stored has also increased greatly. Accordingly, the number of contents included in the contents list has greatly increased. At this time, the contents of each content file is stored by accessing and parsing the header to extract the license key ID, and when obtaining the DRM information using the extracted license key ID takes a long time to provide the content list Of convenience falls.

In addition, in the case of a file protected by the DRM technology, since the DRM information may change over time depending on the number of times the file is played, the DRM information may need to be obtained again every time the content list is searched or re-searched. In this case, when the DRM information is obtained by accessing the content file and parsing the header of the content file every time the content list is searched or re-searched, it takes a long time to provide the content list.

However, according to the embodiment of the present invention, the header parsing unit 12 parses the header of the content file to extract metadata and also extracts a license key ID, and the database 14 extracts the extracted metadata and license key. Save your ID. Accordingly, when a request for providing a content list is received from the user, that is, when searching or re-searching the content list, the search unit 16 may obtain DRM information using the license key ID stored in the database 14. In this case, since the search unit 16 does not have to access the content file storage unit 152 to parse the header of the content file to extract the license key ID, the search speed of the content list is greatly improved.

When the content file is a file protected by the DRM technology, the decryption unit 18 decrypts the content file stored in the content file storage unit 152 using the license file stored in the license file storage unit 151.

The playback unit 19 plays back the content file decrypted by the decryption unit 18 when the content file is a file protected by the DRM technology, and the content storage unit 152 when the content file is not a file protected by the DRM technology. Play the content file stored in). Here, the decoded content may be audio or video.

In one embodiment of the invention, the input unit 11, header parser 12, converter 13, database 14, storage unit 15, the search unit 16 and the display unit 17 is a content list It can be used as a providing device. In another embodiment of the present invention, the input unit 11, the header parsing unit 12, the conversion unit 13, the database 14, the storage unit 15, the search unit 16, the display unit 17, the decoding unit ( 18 and the playback unit 19 can be used as a content playback device.

3 is a flowchart illustrating a content list providing method according to an embodiment of the present invention.

Referring to FIG. 3, the method for providing a content list according to the present exemplary embodiment includes steps processed in time series in the first terminal 10 illustrated in FIG. 2. Therefore, even if omitted below, the contents described above with respect to the first terminal 10 illustrated in FIG. 2 also apply to the method for providing a content list according to the present embodiment. In addition, as described above, in another embodiment of the present invention, the content list providing method may be applied to the second terminal 20 and the host 30.

In step 31, the header parsing unit 12 extracts at least one of metadata and a license key ID from the header of the content file. As such, the header parsing unit 12 extracts the metadata and the license key ID from the header of the content file when the content file is input, so that the search unit 16 extracts the license key ID when providing the content list later. In order to do this, the header of the content file does not need to be parsed separately.

In step 32, the database 14 stores at least one of the extracted metadata and the license key ID.

In operation 33, when the content file is a file protected by DRM technology, the search unit 16 searches for a license in the license file stored in the license file storage unit 151 using the license key ID stored in the database 14. Acquire DRM information about the content file. As such, the searcher 16 may use the license key ID stored in the database 14 without accessing the content file stored in the content file storage 152 to obtain the DRM information. As a result, the time required to provide the content list is greatly reduced from the terminal's point of view, and the time required to retrieve the content list is greatly reduced from the user's point of view.

In operation 34, the display unit 17 provides the user with a content list including at least one of metadata stored in the database 14 and DRM information in the searcher 16. Thus, among the contents included in the content list, the file protected by the DRM technology displays metadata and DRM information, and the file not protected by the DRM technology displays only the metadata.

4 is a flow chart illustrating in more detail the steps of extracting the metadata and license key ID of FIG. 3.

Referring to FIG. 4, the extracting of the metadata and the license key ID according to the present embodiment may include an input unit 11, a header parser 12, and a converter included in the first terminal 10 shown in FIG. 2. It consists of the steps processed in time series in (13). Therefore, even if omitted below, the contents described above with respect to the input unit 11, the header parsing unit 12, and the conversion unit 13 shown in FIG. The same applies to the extraction step.

In operation 311, the input unit 11 receives a content file. Here, the received content file may be paid content protected by DRM technology or may be free content not protected by DRM technology.

In step 312, the header parsing unit 12 parses a header of the content file.

In step 313, the header parser 12 extracts metadata from the header of the content file.

In step 314, the header parsing unit 12 determines whether the content file is a content file protected by the DRM technology. If it is determined that the content file is a content file protected by the DRM technology, step 314 is performed, otherwise step 32 is performed.

In step 315, the header parsing unit 12 extracts a license key ID from the header of the content file.

In operation 316, the conversion unit 13 converts the license key ID formed of the character string into binary data. Specifically, the conversion unit 13 may perform base64 decoding on the license key ID to convert the license key ID formed of a character string into binary data. However, in another embodiment of the present invention, the conversion unit 13 may not perform step 316. In this case, the database 14 stores a license key ID consisting of metadata and character strings.

FIG. 5 is a flowchart illustrating the operation of obtaining DRM information of FIG. 3 in more detail.

Referring to FIG. 5, the obtaining of the DRM information according to the present exemplary embodiment includes steps processed in time series by the search unit 16 included in the first terminal 10 illustrated in FIG. 2. Therefore, even if omitted below, the above description of the search unit 16 shown in FIG. 2 is applied to the step of acquiring the DRM information according to the present embodiment.

In operation 331, the search unit 16 accesses the database 14. For example, when a search request for a content list is received from a user, the search unit 16 accesses the database 14.

In operation 332, the searcher 16 determines whether the content file is a content file protected by a DRM technology. As a result of the determination, if the content file is a content file protected by the DRM technology, step 333 is performed. Otherwise, step 34 is performed.

In operation 333, the searcher 16 extracts a license key ID from the database 14.

In operation 334, the search unit 16 obtains DRM information by searching for a license in a license file stored in the license file storage unit 151 using the license key ID.

In operation 335, the searcher 16 outputs the metadata stored in the database 14 and the acquired DRM information to the display unit 17. As a result, the display unit 17 may provide the user with a content list including metadata and DRM information.

In operation 336, the searcher 16 outputs the metadata stored in the database 14 to the display unit 17.

Steps 331 to 336 are repeated as many times as the number of contents included in the content list.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications will fall within the scope of the invention.

In addition, the apparatus according to the present invention can be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and also include a carrier wave (for example, transmission through the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

1 is a block diagram schematically illustrating a communication system in an embodiment of the present invention.

FIG. 2 is a block diagram illustrating the first terminal of FIG. 1 in more detail.

3 is a flowchart illustrating a content list providing method according to an embodiment of the present invention.

4 is a flow chart illustrating in more detail the steps of extracting the metadata and license key ID of FIG. 3.

FIG. 5 is a flowchart illustrating the operation of obtaining DRM information of FIG. 3 in more detail.

Claims (12)

In the method of providing a list of contents protected by digital rights management (DRM) technology, In the storage unit, storing the input license file and the content file; Extracting at least one of metadata and a license key ID from a header of the content file in a header parser; Converting, by the conversion unit, the extracted license key ID into binary data; Storing at least one of the extracted metadata and the converted license key ID in a database; In the searching unit, when the content file is a file protected by DRM technology, obtaining DRM information on the content file by searching for a license in the license file using the stored license key ID; And And providing, by the display unit, a content list including at least one of the stored metadata and the obtained DRM information to a user. delete The method of claim 1, Converting the extracted license key ID to binary data, And performing base64 decoding on the extracted license key ID to convert the license key ID into a binary data. The method of claim 1, Extracting at least one of metadata and a license key ID from the header of the content file, In the header parsing unit, parsing a header of the content file to extract the metadata from the header; Determining, by the header parsing unit, whether the content file is a file protected by a DRM technology; And And extracting, by the header parsing unit, the license key ID from the header of the content file when the content file is a file protected by a DRM technology. The method of claim 1, The DRM information, the content list providing method characterized in that it comprises at least one of the usage rights, the number of times and the available period for the content file. delete A storage unit which stores a content file and a license file; A header parser which parses a header of the content file and extracts at least one of metadata and a license key ID; A converting unit converting the extracted license key ID into binary data; A database storing at least one of the extracted metadata and the converted license key ID; A search unit for obtaining DRM information on the content file by searching for a license in the license file using the stored license key ID when the content file is a file protected by a DRM technology; And And a display unit for providing a user with a content list including at least one of the stored metadata and the obtained DRM information. delete The method of claim 7, wherein And the DRM information includes at least one of a usage right, a usage count, and an available period for the content file. A storage unit which stores a content file and a license file; A header parser which parses a header of the content file and extracts at least one of metadata and a license key ID; A converting unit converting the extracted license key ID into binary data; A database storing at least one of the extracted metadata and the converted license key ID; A search unit for obtaining DRM information on the content file by searching for a license in the license file using the stored license key ID when the content file is a file protected by a DRM technology; A display unit for providing a user with a content list including at least one of the stored metadata and the obtained DRM information; A decryption unit to decrypt the contents using the license; And And a playback unit for playing the decrypted content. delete The method of claim 10, The DRM information includes at least one of a usage right, a usage count, and an available period for the content file.

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