KR20100069476A - Method and system for providing broadcasting service using contents for vod encrypted by individual key - Google Patents

Abstract

PURPOSE: A broadcasting service providing method and system using the contents encrypted to the individual key for the VOD(Video On Demand) are provided so that by providing the broadcast service based on the encrypted contents for VOD as described above, the security of the contents is intensification made. CONSTITUTION: The license management(120) refers to the schedule information about the contents data encrypted to the individual key from the contents schedule information. The license of coding contents data is created. The contents database(140) stores coding contents data and license. The contents data source(130) transmits license and coding contents data corresponding to license with the user terminal.

Description

Method and system for providing broadcasting service using contents for video encrypted with individual key {METHOD AND SYSTEM FOR PROVIDING BROADCASTING SERVICE USING CONTENTS FOR VOD ENCRYPTED BY INDIVIDUAL KEY}

The present invention relates to a method and a system for providing a broadcast service using content for video on demand (VOD), and more particularly, a license is generated in advance by using a schedule of content for VOD provided to a broadcast and transmitted to a user terminal. The present invention relates to a method and a system for transmitting a content for VOD encrypted by a broadcast service.

In general, a broadcast type service is provided only to a user who has a right to use, for example, a service subscriber, and various encryption methods are used to prevent the leakage of content to an unauthorized user.

In general, the broadcast providing system includes a content providing server providing content to a user and a user terminal receiving the content and outputting the content to a screen.

The content providing server encrypts the provided content to the user terminal in order to prevent the content from being exposed to a user who does not have permission to use the content, and transmits a decryption key for decrypting the encrypted content only to the user terminal having permission to use the content. do.

Therefore, the user terminal with the use right receives the encrypted content and the decryption key to decrypt and output the encrypted content.

In the case of providing a broadcast service using contents of various types of files according to the related art, after streaming an unencrypted file, a CAS (Conditional Access System) or Live DRM (Live Digital Right Management) is used. In addition, real-time encryption of the provided content is applied.

However, according to the conventional technology, in order to provide a video on demand (VoD) and a broadcast service together, two types of contents, encrypted content and unencrypted content, must be managed. As a result, an operation burden increases due to an increase in the number of contents to be managed, and there is a risk of content leakage because unencrypted contents exist in the content providing server.

In order to reduce the operational burden and enhance the security of contents by preventing the leakage of unencrypted contents, a broadcast type service may be provided using encrypted VOD contents, but in this case, issuance of a license key for the encrypted VOD contents, etc. This increases the load on the server.

In other words, in the case of a general VOD content providing service that provides VOD content only to the user terminal that requested the content, even if the issue of the license key and the provision of the encrypted VOD content are performed at the same time, the service does not have a load problem on operation processing in the server. Is possible.

 However, when broadcasting a VOD content encrypted with an individual key in a broadcast service provided to a plurality of user terminals, the license manager must issue a license key in real time to a plurality of user terminals. Since the number of licenses issued per hour is extremely limited, in order to provide services in this way, the license server must be increased in proportion to the number of users, resulting in an increase in equipment and operating costs.

An embodiment of the present invention uses the encrypted VOD content to provide a broadcast service to prevent the leakage of the original to enhance the content security and reduce the cost due to redundant storage and management, broadcast schedule information, that is, content schedule information Providing a license for decrypting the encrypted VOD content in advance by using a scheme, and transmitting the generated license to the user terminal before transmitting the encrypted VOD content to the user terminal, to provide a broadcast service using the VOD content In order to provide a smooth broadcasting service without additional server for license issuance.

As a technical means for achieving the above-described technical problem, the first aspect of the present invention (a) receiving the content schedule information for the content data provided to at least one user terminal for performing the broadcast reception, (b) When the received content schedule information includes a schedule for content data encrypted with an individual key, generating a license for each user terminal for the encrypted content data; and (c) converting the encrypted content data into the encrypted content. Transmitting the license in advance to the user terminal to be received before transmitting the data to the user terminal to which the data is received, wherein the license is stored in a database of the user terminal and used to decrypt the content encrypted with the individual key. For VOD encrypted with private key It can provide a method for providing broadcast services using the content.

In the first aspect of the present invention, the step (b) comprises the steps of (b1) searching for a user terminal to which the encrypted content data is to be received, and (b2) processing the license so that it is available only to the searched user terminal. It may include.

In addition, in the first aspect of the present invention, the content schedule information may be received and updated at predetermined intervals.

In addition, a second aspect of the present invention provides a license management unit for retrieving schedule information for content data encrypted with an individual key from content schedule information, and generating a license for retrieved encrypted content data, for encrypted content data and the encrypted content data. A content database storing a generated license and a content data transmitting unit for transmitting the generated license and encrypted content data corresponding to the license to a user terminal receiving the encrypted content data, wherein the license is provided to each user terminal. Uniquely generated, and stored in a database of the user terminal in advance before transmission of the encrypted content data and used to decrypt the encrypted content data with the individual key. A broadcast service providing system using the VOD content can be provided.

According to the above-mentioned problem solving means of the present invention, before the encrypted content data for VOD is transmitted to the user terminal, each user terminal has a license including decryption information for the content data for VOD encrypted using the content schedule information. It generates in advance and transmits it to each user terminal in advance, and afterwards provides the encrypted VOD content data to each user terminal according to the content schedule, thereby reducing the redundant storage and management cost of the content and multiple users It also solves the problem of issuing a real-time license for the network, and it is not necessary to expand the license server for this type of broadcasting service.

In addition, according to the above-described problem solving means of the present invention, since the broadcast service is provided using the encrypted VOD content, it is possible to prevent the unencrypted content from leaking to the outside to cause a security problem.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

1 is a block diagram illustrating a configuration of a broadcast service providing system using VOD contents encrypted with an individual key according to an embodiment of the present invention.

The broadcast service providing system according to an embodiment of the present invention includes a content providing server group 100 and a user terminal 200.

The content providing server group 100 includes a schedule receiving unit 110, a license managing unit 120, a content data transmitting unit 130, and a content database 140.

The schedule receiving unit 110 receives a broadcast schedule, that is, a schedule of content provided by a broadcast service, from a schedule providing server (not shown), and stores the received content schedule in the content database 140. The content schedule may include information about broadcast content provided to the user terminal 200.

The schedule providing server (not shown) may exist separately from the content providing server group 100 or may be included in the content providing server group 100.

When the license manager 120 receives a content schedule from the schedule receiver 110, the license manager 120 determines whether an encrypted VOD content is newly added to the received content schedule. If there is an encrypted VOD content added to the content schedule, the license manager 120 generates a license corresponding to the added VOD content and transmits it to the content database 140 to store the license.

The license generated by the license manager 120 includes a license key capable of decrypting a corresponding VOD content. In addition, a license is generated separately for each user terminal and encrypted so that it can be decrypted by the user's or unique identification information of the user terminal. That is, the license is individually encrypted for each user terminal.

In addition, the license manager 120 identifies a user terminal that has a use right for the encrypted VOD contents but has not yet received a corresponding license, and obtains the contents data of the user terminal and the license information that are the targets of receiving the license. The transmission unit 130 transmits the license corresponding to the VOD contents to the user terminal by the content data transmission unit 130.

The content data transmitter 130 transmits the content data stored in the content database 140 to the user terminal 200 when the user terminal 200 requests or sets the content schedule information in advance.

In addition, the content data transmission unit 130 receives the license and the information of the user terminal from the license management unit 120, and receives a license corresponding to the received information from the content database 140 to the user terminal corresponding to the received information send.

The content database 140 stores the encrypted VOD content and the encrypted VOD content. The information of the encrypted VOD content includes information on whether the content is encrypted and information on individual keys used for encryption.

In addition, the content database 140 stores information of the user terminal, for example, identification information of the user terminal, unique information for generating a license, and information on whether to receive content. In addition, the content database 140 stores the content schedule received from the schedule receiving unit 110 and the license generated by the license manager 120.

The user terminal 200 includes a data receiver 210, a user terminal database 220, a decoder 230, and a content playback unit 240.

The data receiver 210 receives content data or a license from the content providing server group 100. The data receiving unit 210 stores the received license in the user terminal database 220 and transmits the received content data to the decryption unit 230 or the content reproducing unit 240 according to whether the content is encrypted.

That is, when the received content data is encrypted VOD content data, the data receiver 210 transmits the received content data to the decryption unit 230. In addition, when the received content data is unencrypted content data, the data receiving unit 210 transmits the received content data to the content reproducing unit 240.

The user terminal database 220 receives a license from the data receiver 210 and stores it. As described above, the license is encrypted and transmitted to the user terminal 200, and the user terminal database 220 stores user identification information as a decryption key capable of decrypting the encrypted license.

The decryption unit 230 receives the encrypted VOD content data from the data receiving unit 210 and retrieves a license corresponding to the received VOD content data from the user terminal database 220. The decryption unit 230 decrypts the encrypted VOD content data using the retrieved license.

That is, the decryption unit 230 decrypts the encrypted license using the user identification information stored in the user terminal database 220 and obtains a license key included in the license. The decryption unit 230 decrypts the encrypted VOD content data using the obtained license key and transmits the decrypted content data to the content reproducing unit 240.

If the license corresponding to the encrypted VOD content data is not stored in the user terminal database 220, the decryption unit 230 requests the content providing server group 100 for a license corresponding to the encrypted VOD content data. And decrypts the encrypted VOD content data using the same.

The content player 240 reproduces the unencrypted content data received from the data receiver 210 or the decrypted content data received from the decryptor 230 and outputs the same to a display device (not shown).

2 is a flowchart illustrating a flow of generating and transmitting a license by a content providing server in a broadcast service providing method using content for VOD encrypted with an individual key according to an embodiment of the present invention.

In step S110, a content schedule is received from a schedule providing server (not shown). The content schedule may include information on broadcast content, for example, identification information of broadcast content, broadcast schedule information, and the like.

In step S120, the content schedule received in step S110 is analyzed to determine whether a new content schedule has been added to the existing content schedule. That is, the content providing server group analyzes the received content schedule to determine whether a schedule for providing new content has been added.

In step S130, when it is determined in step S120 that a new content schedule is added, it is determined whether encrypted content data for VOD exists in the added content schedule.

The content data provided by the content providing server group is not necessarily provided encrypted, but may be provided to the user terminal in an unencrypted state. In the case of the unencrypted content data, since a license for decryption is not required, the content providing server group may determine whether to generate a license by determining whether the encrypted content data exists in the added content schedule.

In step S140, when it is determined that the encrypted VOD content data exists in the added schedule in step S130, the user terminal that is the target of receiving the added encrypted VOD content data is identified.

That is, whether or not to receive the encrypted VOD content data may be preset for one or more user terminals, and the user terminal configured to receive the encrypted VOD content data is previously determined.

In step S150, a license is generated for the user terminal determined to be the target of receiving the VOD content data encrypted in step S140. As described above, the license for the encrypted VOD content data includes a decryption key capable of decrypting the encrypted content.

In addition, the license is generated by encrypting each user terminal separately. The encrypted license may be decrypted by decryption information unique to each user terminal, for example, user identification information. Thus, one or more encrypted licenses may be generated for each user terminal.

In step S160, one or more licenses generated in step S150 are transmitted to each user terminal identified in step S140.

In one embodiment of the present invention described above, the reception and confirmation of the schedule in the step (S110 to S120) may be performed in real time or may be performed every predetermined period. That is, it is possible to check whether or not the added schedule by receiving and confirming the content schedule in real time, or by checking and receiving the content schedule every preset period.

In addition, the generation and transfer of the license in the above-described steps (S150 to S160) is performed before transmitting the content data to the user terminal. Therefore, it is possible to prevent the load of the license manager that occurs when a license is generated while simultaneously transmitting content data to the user terminal.

The generation and transmission of such a license may be sequentially performed on a plurality of encrypted VOD content data by queue type management, that is, a first in, first out (FIFO) method.

3 is a flowchart illustrating a method of reproducing content data in a user terminal in a broadcast service providing method using VOD content encrypted with an individual key according to an embodiment of the present invention.

In step S210, the license is received from the content providing server and stored. The stored license corresponds to encrypted VOD content data that has not yet been received from the content providing server. That is, the user terminal receives a license for decryption in advance before receiving the encrypted VOD content data from the content providing server.

In step S220, the content data is received from the content providing server. The content data may be received in a download manner as well as in a streaming manner.

In step S230, it is determined whether the content data received in step S220 is encrypted content. The content data received in step S220 includes not only encrypted VOD content but also unencrypted content data. The determination of whether the encrypted content data may be performed through a protocol previously agreed between the content providing servers.

In step S240, when it is determined in step S230 that the encrypted VOD content data is received, the license corresponding to the received encrypted VOD content data is searched for and received using the retrieved license. The decrypted content data for VOD.

As described above, the license received from the content providing server is in an encrypted state and may be decrypted by unique decryption information of the user terminal, for example, user identification information. In addition, the decryption information of the license may be stored in advance by the user terminal through a storage medium such as a smart card or a memory.

The license includes a license key, and the license key includes decryption information for decrypting encrypted content data for VOD. Therefore, the VOD content data encrypted by the license decrypted by the decryption information of the user terminal can be decrypted.

In step S250, the content data decoded in step S240 is reproduced and output to a display device such as a television or a monitor.

As described above, since the user terminal decrypts and reproduces the encrypted VOD content received from the content providing server using a license previously received, the user terminal does not need to receive the license again after receiving the encrypted VOD content data. Therefore, real-time broadcasting service may be possible.

One embodiment of the present invention can also be implemented in the form of a recording medium containing instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a block diagram showing the configuration of a broadcast service providing system using VOD contents encrypted with an individual key according to an embodiment of the present invention;

2 is a flowchart illustrating a flow of generating and transmitting a license by a content providing server in a broadcast service providing method using content for VOD encrypted with an individual key according to an embodiment of the present invention.

3 is a flowchart illustrating a method of reproducing content data in a user terminal in a broadcast service providing method using content for VOD encrypted with an individual key according to an embodiment of the present invention.

Claims (8)

In the broadcast service providing method using the content for VOD encrypted with an individual key, (a) receiving content schedule information on content data provided to at least one user terminal performing the broadcast reception; (b) generating a license for each user terminal for the encrypted content data when the received content schedule information includes a schedule for content data encrypted with an individual key; and (c) transmitting the license to the user terminal that is the reception target before transmitting the encrypted content data to the user terminal that is the reception target of the encrypted content data; Including, And the license is stored in a database of a user terminal and used to decrypt the content encrypted with the individual key. The method of claim 1, Step (b) is (b1) searching for a user terminal to which the encrypted content data is received; and (b2) processing the license to be available only to the retrieved user terminal Broadcast service providing method comprising a. The method of claim 2, The license is encrypted data, and can be decrypted by user terminal information previously stored in the user terminal. The method of claim 1, The content schedule information may be received at predetermined intervals and updated. In the broadcast service providing system using the content for VOD encrypted with an individual key, License management unit for retrieving the schedule information for the content data encrypted with the individual key from the content schedule information, and generates a license for the retrieved encrypted content data, A content database for storing encrypted content data and a license generated for the encrypted content data; The content data transmission unit for transmitting the generated license and the encrypted content data corresponding to the license to a user terminal receiving the encrypted content data. Including, And the license is uniquely generated for each user terminal and stored in a database of the user terminal in advance before transmission of the encrypted content data and used to decrypt the encrypted content data with the individual key. The method of claim 5, And the license manager detects a user terminal to which the retrieved encrypted content data is received and generates the license only for the identified user terminal. The method of claim 5, The content schedule information is updated at predetermined intervals, The license management unit further generates a license based on the updated content schedule information, and transmits the additionally generated license to a corresponding user terminal. The method of claim 6, The user terminal, A decryption unit for decrypting the encrypted license using the unique information of the user terminal and decrypting the encrypted content data using the decryption information included in the license Broadcast service service providing system comprising a.

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