KR20090018476A - Apparatus and method for playing digital rights management contents - Google Patents

Abstract

An apparatus and a method for efficiently reproducing DRM contents by using a multimedia processor and a baseband processor are provided to prevent the degradation of the screen quality of the DRM contents and to perform the decoding and reproducing operation of the DRM contents through the multimedia processor. A DRM(Digital Rights Management) contents reproducing apparatus comprises a multimedia processor(24) and a baseband processor(21). The multimedia processor includes a rights object communications unit(25), an encoding/decoding part(26) and a contents analysis section(27). The multimedia processor requests the rights object required for the regeneration of the DRM contents to the predetermined baseband processor according to the request of the DRM contents. The baseband processor comprises a rights object manager(22) and a rights object storage(23).

Description

DRM content playback device and method thereof {APPARATUS AND METHOD FOR PLAYING DIGITAL RIGHTS MANAGEMENT CONTENTS}

The present invention relates to an apparatus and method for reproducing content to which DRM (Digital Rights Management) technology is applied. More particularly, the present invention relates to an apparatus and method for efficiently reproducing DRM content without interruption or screen quality degradation. do.

DRM (Digital Rights Management) technology is a digital rights management technology that, in consultation, simply prevents illegal copying of content, and broadly represents a technology and service system for ensuring transparency and reliability throughout the entire digital content lifecycle.

Recently, the contents protected by the DRM technology (hereinafter referred to as DRM contents) include various multimedia contents such as VOD, movies, and flashes, and the size thereof is rapidly increasing. Accordingly, resources required for playing DRM content are also increasing.

In addition, since the DRM content is transmitted and received online such as the Internet, it can be easily reproduced by an illegal user without proper rights. In order to protect the DRM content from illegal copying, it is preferable that the DRM content is transmitted and received through an encryption / decryption process.

However, as the piracy technology is developed, the encryption and decryption technology to defend it is more complicated, and the resources for performing it are increasing. For example, the use of complex encryption / decryption algorithms such as the Advanced Encryption Standard (AES) to play DRM content increases the resources required.

On the other hand, management of the reproduction and usage restriction of the encrypted DRM content is performed by software called a DRM client mounted in the portable terminal. In general, the DRM client is executed by a single processor provided in the portable terminal. In addition to the playback of DRM content, the single processor of the portable terminal should perform the basic functions of the portable terminal such as signal processing and graphic processing necessary for wireless communication.

As a result, since the limited resources of the mobile terminal can be divided and allocated to performing various functions, the resources allocated to the playback of the DRM content are very limited. As a result, a complex encryption / decryption technique is applied and a problem occurs such that a break occurs when the DRM content is rapidly increasing in capacity, or the quality of the reproduced content screen is degraded.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, an efficient DRM that prevents the phenomenon of dropping or degradation of the screen quality when playing a large amount of DRM content despite the limited resources of the portable terminal The present invention provides an apparatus and method for reproducing a content.

In order to achieve the above object, the present invention proposes a DRM content reproducing apparatus and method for distributing and decoding DRM content, which is a function of a DRM client performed in a single processor of a mobile terminal, and applying rights to two processors.

More specifically, according to an aspect of the present invention, the above object is, in the DRM content playback device, in response to the request for the playback of the DRM content, request a rights object required for playing the DRM content to a predetermined baseband processor; A multimedia processor for decoding and playing the DRM content by using the writes object received in response to the request; And a baseband processor configured to transmit the corresponding writes object to the multimedia processor according to a request for providing the writes object.

In this case, the multimedia processor, the content analysis unit for transmitting the identification information of the DRM content and the write object object acquisition address obtained by analyzing the DRM content to the baseband processor; An encryption and decryption unit that decrypts the DRM content by using an encryption key included in the received writes object; And a writes object communication unit configured to transmit identification information of the DRM content and the write object acquisition address to the baseband processor, and to transmit the received writes object to the encryption / decryption unit.

The baseband processor may further include a writes object storage unit for storing at least one writes object necessary for decoding DRM contents having different formats; And a writes object manager for transmitting the stored writes object to the multimedia processor when the writes object corresponding to the identification information of the DRM content is stored in the storage unit.

Meanwhile, according to another aspect of the present invention, in the method for reproducing digital rights management (DRM) content, the multimedia processor identifies information and Drite contents of DRM content included in the DRM content in response to a DRM content reproduction request. (Rights Object) acquiring the acquisition address and transmitting to the predetermined baseband processor; If the baseband processor stores the writes object corresponding to the identification information of the DRM content, transmitting the stored writes object to the multimedia processor; And decrypting and playing the DRM content by using the encryption key included in the stored writes object.

As described above, according to the present invention, there is provided an efficient DRM content player and a method for preventing the dropping or the deterioration of the screen quality during DRM content playback despite the limited resources of the portable terminal.

That is, by deciphering and playing the DRM content through a multimedia processor, and applying each function to a separate processor to perform the rights management function of the DRM content through a baseband processor, It is possible to prevent the playback of DRM content or the degradation of the screen quality that occurs when all the functions are performed.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention; In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may obscure the gist of the present invention, the detailed description will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a diagram showing the configuration of a DRM content player according to the present invention.

As shown in FIG. 1, the DRM content player according to the present invention includes a wireless communication unit 20, a baseband processor 21, a multimedia processor 24, and a storage unit 28.

The wireless communication unit 20 modulates and transmits a signal processed by the baseband processor 21, or demodulates a signal received by the DRM content player and transmits the signal to the baseband processor 21.

The storage unit 28 stores the decoded DRM content and a control program necessary for the operation of the portable terminal.

The multimedia processor 24 includes a writes object communication unit 25, an encryption and decryption unit 26, and a content analysis unit 27.

The content analyzer 27 determines DRM content identification (ID) and a writes object acquisition address in the DRM content according to the DRM content reproduction request. At this time, the write object acquisition address indicates an address of a server or the like which stores the write object which is not stored in the baseband processor 21. Thereafter, the content analyzer 27 transmits the identified DRM content identification information and the writes object acquisition address to the writes object communication unit 25. In this case, when the usage of the write object is set, the content analyzer 27 transmits the write object consumption request information to the write object object communication unit 25 together with the DRM content identification information and the write object acquisition address. Here, the write object consumption request information indicates information for requesting consumption of the write object as limiting the use of the write object.

The writes object communication unit 25 includes the DRM content identification information, the write object acquisition address or the DRM content identification information, the write object acquisition address, and the write object consumption request information in the write object request message to the baseband processor 21, In response to the write object request message, the write object response message received from the baseband processor 21 is transmitted to the decryption unit 26.

On the other hand, the writes object communication unit 25 transmits the writes object request message to the baseband processor 21, and if the writes object response message is not received for a predetermined time, the writes object re-request message is generated to generate the baseband processor 21. To transmit. In this case, the write object re-request message is a message for causing the baseband processor 21 to acquire the write object from the write object acquisition address, and preferably includes the DRM content identification information and the write object acquisition address.

The writes object communication unit 25 transmits the writes object re-response message received from the baseband processor 21 to the encryption / decryption unit 26 in response to the writes object re-request message. The writes object communication unit 25 preferably displays the authority information on the display device (not shown) when the rights object response message or the rights object re-response message includes authority information such as the number of times of usage of the righteous object and usage time. .

The encryption / decryption unit 26 decrypts and reproduces the encrypted data of the DRM content by using the writes object included in the writes object response message or the writes object re-response message. That is, the encryption / decryption unit 26 decrypts and reproduces the encrypted data of the DRM content by using the encryption key included in the writes object. Here, the encryption / decryption unit 26 decrypts the encrypted data of the DRM content through an encryption module according to the format of the DRM content, and for this purpose, it is preferable to include a plurality of encryption modules according to the format of the DRM content.

The baseband processor 21 includes a writes object manager 22 and a writes object storage unit 23.

The writes object manager 22 includes the stored writes object in the writes object response message when the writes object corresponding to the DRM content identification information included in the writes object request message is stored in the writes object storage 23. To 24). At this time, the writes object includes an encryption key necessary for decryption for reproduction of the DRM content, authorization information such as writes object use count information and use time information. That is, the write object response message includes an encryption key required for decryption for reproduction of the DRM content and authorization information that defines the restriction on the use of the DRM content.

If the write object object 22 includes consumption request information, the write object manager 22 consumes the write object according to the type of restriction of the write object. That is, the writes object manager 22 decreases the writes object usage count by a set number, for example, "1", if the type of restriction on the writes object is related to the usage count of the writes object. The information is reflected in the authority information and stored in the writes object storage unit 23.

On the other hand, the writes object manager 22 stores the write object usage start time information in the writes object storage unit 23 by reflecting the light object usage start time information in the writes object authority information, when the type of restriction of the writes object is related to the usage time limitation of the writes object. do. Therefore, the Writes object is used for a certain usage time from the usage restriction start time. In this case, the usage limit start time of the writes object may be a time for receiving the writes object consumption request information.

On the other hand, the writes object manager 22 does not have a writes object corresponding to the DRM content identification information included in the writes object request message in the writes object storage unit 23, or the writes object re-request message in the multimedia processor 24. If is received, in order to obtain a writes object corresponding to the DRM content identification information, and transmits a writes object acquisition message to the writes object acquisition address.

When the Rights Object Acquisition Response message is received in response to the Rights Object Acquisition message from the Rights Object Acquisition Address, the Rights Object Manager 22 transfers the Rights object included in the Rights Object Acquisition Response message to the Rights Object Response message or the Rights Object Re-response message. It is included and transmitted to the multimedia processor 24. Here, the writes object manager 22 preferably provides the writes object to the multimedia processor 24 and stores the writes object in the writes object storage unit 23.

The write object storage unit 23 stores a plurality of write objects including encryption keys and authorization information necessary for decryption for reproduction of the DRM content.

As described above, the DRM content reproducing apparatus according to the present invention performs the function of each of the DRM clients to perform decoding and playback of the DRM content, which is a function of the DRM client, in the multimedia processor, and to perform rights management among the DRM client functions in the baseband processor. By applying the distributed to a separate processor, it is possible to prevent the playback of the DRM content or the degradation of the screen quality that occurs when performing all the functions of the DRM client in a single processor.

2 is a flowchart illustrating a DRM content playback method of the DRM content playback apparatus according to the present invention.

The DRM content playback method of the DRM content player shown in FIG. 2 may be performed by the multimedia processor of the DRM content player shown in FIG. 1. Therefore, the description of the DRM content playback method of the DRM content playback apparatus will be made mainly by the multimedia processor.

As the DRM content reproduction request is received, the multimedia processor determines the DRM content identification information (ID) and the write object object acquisition address from the DRM content requested for reproduction (S10 and S11). In this case, the write object acquisition address indicates an address of a server or the like storing a write object that is not stored in the DRM content player.

The multimedia processor includes the identified DRM content identification information and the write object acquisition address in the write object request message and transmits it to the base band processor (S12). In this case, when the use of the write object is set, the multimedia processor may include the write object consumption request information together with the DRM content identification information and the write object acquisition address in the write object request message and transmit the same to the base band processor. Here, the write object consumption request information is for limiting the use of the write object, and represents information for requesting consumption of the write object.

Thereafter, the multimedia processor checks whether the write object is received from the baseband processor in response to the write object request message (S13). When the multimedia object receives the writes object from the baseband processor, the multimedia processor decrypts and encrypts the encrypted data of the DRM content using the received writes object (S14, S15). In this case, the multimedia processor preferably selects an encryption module according to the format of the DRM content to decrypt the encrypted data of the DRM content.

On the other hand, if the writes object is not received from the baseband processor within the set time, the multimedia processor transmits the identified DRM content identification information and the writes object acquisition address to the baseband processor (S16).

Thereafter, the multimedia processor performs steps S14 and S15 or performs step S16 according to whether or not the right object is received from the baseband processor in step S13.

3 is a flowchart illustrating a method of providing a lights object in the DRM content player according to the present invention.

The method of providing a writes object of the DRM content player shown in FIG. 3 may be performed by the baseband processor of the DRM content player shown in FIG. 1. Therefore, the description of the method of providing the righteous object of the DRM content player will be made based on the baseband processor.

When the baseband processor receives the write object request message from the multimedia processor (S20), the baseband processor searches the stored write object and checks whether the write object corresponds to the DRM content identification information included in the write object request message (S21). S22). The baseband processor transmits the writes object corresponding to the DRM content identification information to the multimedia processor when the writes object corresponding to the DRM content identification information is stored (S23).

On the other hand, if the writes object corresponding to the DRM content is not stored, the baseband processor requests the writes object from the writes object acquisition address included in the writes object request message (S24). When the baseband processor receives the writes object requested from the write object acquisition address, the baseband processor transmits the received writes object to the multimedia processor (S25). In this case, the baseband processor may store the storage device provided with the received lights object, for example, the lights object storage shown in FIG. 1.

On the other hand, when the baseband processor receives a write object object request message from the multimedia processor, the baseband processor requests a write object corresponding to DRM content identification information from the write object object address, and transmits the received object to the multimedia processor according to the request. . That is, the baseband processor provides a writes object to the multimedia processor in response to the write object request message, and then, if a write object re-request message is received from the multimedia processor, requests the writes object from the write object acquisition address.

The baseband processor transmits the received write object to the multimedia processor when the write object is received from the write object acquisition address. At this time, the write object request request message generated by the multimedia processor is generated when the write object received in response to the write object request message from the baseband processor is not received by the multimedia processor for a predetermined time.

If the write object request message includes the write object consumption request information, the baseband processor reflects and stores the appropriate consumption result according to the restriction type of the write object in the authority information of the write object.

As described above, the decoding and playing of the DRM content among the functions of the DRM client is performed through the DRM content playing method of the multimedia processor as shown in FIG. 2, and the rights management of the DRM content among the functions of the DRM client is illustrated in FIG. 3. As shown in the figure, it can be seen that the data is performed through the method of providing the lights object of the baseband processor. That is, by distributing the functions of the DRM client to the baseband processor and the multimedia processor, respectively, it is possible to prevent the disconnection of the DRM content or the degradation of the screen quality that occurs when the DRM client performs all the functions of the DRM client.

1 is a diagram showing the configuration of a DRM content playback apparatus according to the present invention;

2 is a flowchart illustrating a DRM content playback method of the DRM content playback apparatus according to the present invention.

3 is a flowchart illustrating a method of providing a lights object in the DRM content player according to the present invention.

<Description of the symbols for the main parts of the drawings>

21: Baseband Processor 22: Rights Object Manager

23: lights object storage unit 24: multimedia processor

25: lights object communication unit 26: encryption and decryption unit

27: content analysis unit

Claims (18)

In the DRM (Digital Rights Management) content playback device, A multimedia processor for requesting a Rights Object required for playing the DRM content to a predetermined baseband processor according to a request for playing the DRM content, and decoding and playing the DRM content using the received object according to the request. ; Wow And a baseband processor configured to transmit the corresponding writes object to the multimedia processor according to the request for providing the writes object. The method of claim 1, The Rights object is And at least one of an encryption key required for decryption during reproduction of the DRM content, the number of use of the righteous object, and authorization information defined for the use time. The method of claim 1, The multimedia processor, A content analyzer configured to analyze the DRM content and transmit identification information of the DRM content and a write object object acquisition address to the baseband processor; An encryption and decryption unit that decrypts the DRM content by using an encryption key included in the received writes object; And And a writes object communication unit for transmitting the identification information of the DRM content and the write object acquisition address to the baseband processor and transmitting the received write object to the encryption / decryption unit. The method of claim 3, The baseband processor, A writes object storage unit for storing at least one writes object necessary for decoding DRM contents having different formats; Wow And a writes object manager for transmitting the stored writes object to the multimedia processor when the writes object corresponding to the identification information of the DRM content is stored in the storage unit. The method of claim 4, wherein The writes object manager, If a writes object corresponding to the identification information of the DRM content is not stored in the storage unit, a writes object for the reproduction of the DRM content is requested to the writes object acquisition address, and the writes object received at the writes object acquisition address is requested. DRM content playback device for transmitting to the multimedia processor. The method of claim 3, The writes object communication unit, After the identification information of the DRM content and the write object acquisition address are transmitted to the baseband processor, if the write object is not received from the base band processor within a predetermined time, the identification information and the write object acquisition address of the DRM content are stored in the base band processor. Transmitting to the band processor to request retransmission of a writes object. The method of claim 6, The baseband processor, And requesting a writes object from the writes object acquisition address in response to the re-transmission request of the writes object, and transmitting the writes object received from the writes object acquisition address to the multimedia processor. The method of claim 3, The encryption and decryption unit, And a plurality of encryption modules according to the format of the DRM contents, and selecting an encryption module suitable for the format of the DRM contents to decrypt the corresponding DRM contents. The method of claim 3, The content analysis unit, If it is set to limit the number of times of usage of the righteous object, transmitting the righteous object consumption request information to the righteous object communication unit together with identification information of the DRM content and a righteous object acquisition address; And the writes object communication unit requests the writes object by transmitting the writes object consumption request information, identification information of the DRM content, and a writes object acquisition address to the baseband processor. The method of claim 9, The baseband processor, And receiving the right object consumption request information and changing the frequency of use or setting a start time limit for use according to a limit type of the right object corresponding to the identification information of the DRM content. In the method of playing DRM (Digital Rights Management) content, Determining, by the multimedia processor, the identification information and the Rights Object acquisition address of the DRM content included in the DRM content according to a request for playing the DRM content, and transmitting the identification information to a predetermined baseband processor; If the baseband processor stores the writes object corresponding to the identification information of the DRM content, transmitting the stored writes object to the multimedia processor; And And decoding, by the multimedia processor, the DRM content by using an encryption key included in the stored writes object. The method of claim 11, The Rights object is And at least one of an encryption key required for decryption when the DRM content is played back, the number of times the righteous object is used, and authorization information defined for the usage time. The method of claim 11, The baseband processor, If the writes object corresponding to the identification information of the DRM content is not stored, a writes object for playing the DRM content is requested to the writes object acquisition address, and the writes object received from the writes object acquisition address is converted into the multimedia processor. DRM content playback method further comprising the step of transmitting to. The method of claim 11, The multimedia processor, After the identification information of the DRM content and the write object acquisition address are transmitted to the baseband processor, if the baseband processor does not receive the write object within a predetermined time, the identification information and the write object acquisition address of the DRM content are stored in the base band processor. Transmitting to the band processor to request retransmission of the writes object. The method of claim 14, The baseband processor, And requesting a writes object from the writes object acquisition address in response to the re-transmission request of the writes object, and transmitting the writes object received from the writes object acquisition address to the multimedia processor. The method of claim 11, Decrypting and playing the DRM content by using an encryption key included in the stored writes object, Selecting an encryption module suitable for the format of the DRM content and performing decryption of the corresponding DRM content. The method of claim 11, The multimedia processor, If the number of times of use of the write object is set to limit, the DRM content playback further comprises the step of requesting a writes object by sending the writes object consumption request information along with the identification information of the DRM content and a write object acquisition address; Way. The method of claim 17, The baseband processor, And receiving the right object consumption request information and changing the number of times of use or setting a start time limit according to a limit type of the right object corresponding to the identification information of the DRM content.

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