KR20090006055A - Method for protecting content and method for processing information - Google Patents

Abstract

A method for protecting contents and a method for processing information are provided not to apply the revocation process of specific contents by using revocable application information when transmitting the contents that any user is able to see without the restriction of a device or a domain. A CMP module includes an acquisition module(10), a consumption module(40), an export module(50), a storage module(20) and a processing module(30). The acquisition module, the processing module and the export module have a point concept in which the connection to the outside exists, and the storage module and the processing module have internal entity concept. The acquisition module converts the contents and the content related information flowing from the outside to a CMP system into a format which can be used in the CMP system. The acquisition module generates a CMP content license for the use of the CMP content by using CMPI information and content related information received from the outside. The CMP content license is bound to be related to corresponding CMP content. At this time, the CMP content license can be embedded to the CMP content or can exist separated from the CMP content.

Description

{METHOD FOR PROTECTING CONTENT AND METHOD FOR PROCESSING INFORMATION}

The present invention relates to a content protection method and an information processing method. The present invention relates to a content protection and information processing technology capable of controlling whether or not content revocation processing is performed using revocation application information included in a specific information signal received from the outside. .

Recently, with the popularization of wired and wireless Internet, intelligentization and networking of home appliances, digital convergence that creates new types of services through the convergence of different digital services is accelerating. Digital convergence provides the opportunity for service providers to generate new revenue and expand their business, while at the same time providing users with user-oriented services to meet the complex and diversified needs.

As a result of this digital convergence, the existing broadcasting service has been expanded to various types of digital broadcasting services by expanding its scope to content services through wired and wireless networks. Digital broadcasting may provide high quality broadcasting content through a wired network or a wireless network, and may further provide an extended concept of service through linkage with a digital home environment. For example, a content sharing service that stores a broadcast content using a personal recorder or the like and then moves it to another device in a digital home environment for use can be a representative example.

However, for such a content sharing service, a security system that can prevent illegal use or leakage of content is required. In particular, when sharing content, it is beyond the scope of protection such as a CAS (Conditional Access System) for protecting content at the point of broadcast content transmission, so that content can be continuously protected in a local area such as a digital home environment. Should be

Therefore, recently, content protection management systems have been proposed to continuously protect the content when the broadcast content is stored in a digital home environment or a personal recorder, and technologies that can support the content protection management systems such as content handling, Technologies related to license creation and management, domain management, and revocation application and processing are being actively researched.

Technical challenge

An object of the present invention is to provide a technique for controlling whether to apply content revocation processing according to revocation application information input through a specific information signal from the outside.

Technical solution

In order to solve the technical problem of the present invention, the present invention provides a content protection method in one aspect. The content protection method includes receiving revocation application information from an external system, determining a revocation process mode based on the revocation application information, and distributing content to a device on a domain corresponding to an internal system. Mapping the revocation information based on the revocation process mode.

In order to solve the above technical problem, the present invention provides a content protection method in another aspect. The content protection method may include generating revocation application information based on a content attribute and transmitting the revocation application information to control distribution of the content based on the revocation application information. In this case, a revocation process mode may be determined based on the revocation application information, and the revocation information may be mapped based on the revocation process mode.

In order to solve the above technical problem, the present invention provides a content protection method in another aspect. The content protection method may include receiving distributed content based on revocation information and using the content according to preset authority information. In this case, the revocation information may be mapped based on a reporting process mode, and the revocation processing mode may be based on revocation application information.

In order to solve the above technical problem, the present invention provides an information processing method in another aspect. The information processing method is an information processing method using a content management and protection system, the method comprising: receiving service related information including revocation application information of content from the outside and content for the content according to the revocation application information; Applying or not applying revocation processing. In this case, the service related information may be received in the form of a free to air (FTA) broadcast signal.

The revocation application information may be set to any one of a first value indicating not to apply the content revocation processing and a second value indicating to apply the content revocation processing.

When the revocation application information is set to the first value, applying or not applying the content revocation processing to prevent the content revocation processing from applying the specific information included in the content license associated with the content. Setting to a specific value. In this case, the specific information may be a revocation list index list associated with the content.

The information processing method may further include receiving external content, receiving a plurality of information related to the external content, and converting the external content into the content that can be managed and protected by the content management and protection system. The method may further include generating a content license associated with the content using a plurality of pieces of information related to the external content.

In this case, the plurality of pieces of information may include content management and protection information including maintenance rule information for protecting and managing the content in the content management and protection system, and general content protection information for content providing service. Service-related information and revocation-related information for preventing the content from being used in a device without proper authority.

The content management and protection information includes duplication and movement control information for controlling duplication and movement of content, consumption control information for controlling consumption of content, delivery control information for controlling content transfer between devices in a domain; It may include at least one of output control information for controlling the output of the content and additional control information of the content.

The content license includes content license identification information including information for identifying the content license, content license creator information including information for identifying a creator who generated the content license, and compliance / Compliance domain identification information, including compliance / loveness scheme information indicating a loveness scheme, revocation information associated with the content, identification information of a licensed domain in which the content can be used, and It may include at least one of descrambling information and the content management and protection information.

The revocation information may include a list of revocation list indexes. In this case, the revocation index may be numeric information that increases by a predetermined value each time a new revocation list is issued.

Favorable effect

As described above, according to the present invention, it is possible to control whether content revocation processing is applied to revocation application information input through a specific information signal and an FTA broadcast signal from the outside. In particular, the revocation application information may be used to prevent the content revocation processing of the specific content from being applied. Therefore, it can be easily used for transmitting contents that should be viewed by anyone without being restricted by devices or domains such as emergency messages and announcements.

1 is a schematic block diagram illustrating a concept of a content management and protection (CMP) system.

2 is a conceptual diagram illustrating a functional configuration of the CMP module illustrated in FIG. 1.

3 is an exemplary diagram for describing a format of a CMP content license.

4 is a flowchart illustrating a flow of an information processing method according to a preferred embodiment of the present invention.

<Explanation of symbols on the main parts of the drawing>

CD: CMP device

CM: CMP Module

10: acquisition module

20: storage module

30: processing module

40: consumption module

50: export module

Embodiment for Invention

Hereinafter, preferred 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. In the preferred embodiment of the present invention described below, specific technical terms are used for clarity of content. However, the invention is not limited to the particular term selected, and it is to be understood that each specific term includes all technical synonyms that operate in a similar manner to achieve a similar purpose.

1 is a schematic block diagram illustrating the concept of a content management and protection system.

As shown in FIG. 1, a content management and protection (CMP) system 200 forms a domain 5. The domain 5 is a set of authorized CMP devices (CDs) and may mean an area in which reliability is ensured for legitimate use of content. It may be possible for CMP devices (CDs) registered in the domain 5 to mutually move and use content within the range of permitted rights. Such a domain 5 may be implemented in a local environment, for example a digital home environment.

The CMP device CD may refer to a device having a CMP module CM. The CMP module CM performs a function of protecting and managing content flowing into the CMP system 100 from the outside. For example, the CMP module CM may convert the content flowing into the CMP system 100 into a predetermined content form, for example, CMP content, and generate a CMP content license of a specific format that can use the CMP content. . In addition, the generated CMP content can be protected and managed by controlling the use of the CMP content based on the CMP content license.

The CMP device (CD) may include content and CMP information (CMPI: Content Management and Protection Information, or CMPI) associated with the content through a wireless network, a wired network, or a storage medium, and various content related information associated with the content. And the like. The above information may be transmitted to the CMP device (CD) through a predetermined format, route and channel, respectively.

The CMPI may mean usage rule information for protecting and managing CMP content in the CMP system 100.

The CMPI includes copy and movement control information for controlling copy and movement of CMP content, and consumption control information for controlling consumption of CMP content. Propagation control information for controlling propagation of CMP content between CMP devices in a domain, output control information for controlling output of CMP content, and additional control of CMP content Information (Ancillary Control Information) and the like.

The content related information may include service related information of contents, revocation related information, information related to compliance / robustness regime (hereinafter referred to as C / R system), and the like.

The service related information may mean generic content protection information for a content providing service. The content service related information may be transmitted from the service provider side to the CMP device in the form of a Free to Air (FTA) broadcast signal. The service related information may include revocation application information, scrambling indication information, remote access control information, and the like.

Revocation-related information includes information for making content unavailable to fraudulent devices, unauthorized devices, and the like. For example, the revocation information may include a revocation list (hereinafter, abbreviated as RL) or RL related information. The revocation related information may be transmitted to a CMP device (CD) from a service provider side or a server for managing CMP revocation.

The C / R system related information may mean information related to the policy application rule of the service provider for the content. Such C / R system-related information may include information of a C / R system of a content protection system applied to the content, such as Conditional Access (CA) or Digital Rights Management (DRM). The C / R scheme related information may be transmitted from the service provider side or the content protection system server to the device.

FIG. 2 is a conceptual diagram illustrating a functional configuration of the CMP module CM shown in FIG. 1.

As shown in FIG. 2, the CMP module CM includes an acquisition module 10, a consumption module 40, an export module 50, and a storage module. 20 and a processing module 30 may be included. In this case, the acquisition module 10, the consumption module 40, and the export module 50 may have a concept of a contact point in which a connection with the outside exists, and the storage module 20 and the processing module 30 may be In this case, it may have a concept of an internal entity.

The acquisition module 10 converts content and content related information introduced into the CMP system 100 from the outside into a form that can be commonly used in the CMP system 100.

For example, the acquisition module 10 may receive content transmitted from the outside, and scramble the received content into a form defined in the CMP system 100 to convert the content into CMP content CC. The CMP content CC may refer to content in a form that can be protected and managed under the CMP system 100. In addition, the acquisition module 10 generates a CMP content license (CCL) for use of the CMP content (CC) using the CMPI information and the content related information received from the outside.

The content transmitted from the outside to the CMP device (CD) may be clean content received through a trusted transmission scheme, and scrambled content protected by a reliable content protection system such as a CAS or DRM system. It may be. In the latter case, the content is received by the CMP device (CD) and then descrambled through a CAS module or DRM module (existing outside of the CMP module) provided in the CMP device (CD) and converted into a form of clean content. And then sent to the acquisition module 10. In this case, a key for descrambling the content may be obtained by processing content related information associated with the content by processing an Entitle Control Message (ECM) / Entitlement Management Message (EMM).

Meanwhile, the CMP content license CCL generated by the acquisition module 10 is bound to be associated with the corresponding CMP content CC. In this case, the CMP content license (CCL) may be included in the embedded form in the CMP content (CC) or may exist in a separated form from the CMP content (CC).

3 is an exemplary diagram for describing a format of such a CMP content license (CCL).

As shown in FIG. 3, the CMP Content License (CCL) includes a CMP Content License Identification Information Field 62, and a CMP Content License Creator Information Field 63. , C / R Regime Information Field (64), Revocation Information Field (65), Authorized Domain Identification Information Field (66), D. It may include a scrambling information field 67, a CMPI field 68, a CMP content license management data field 69, and the like.

The CMP content license identification information field 62 is a field into which the CMP content license identification information is inserted. The CMP content license identification information may refer to unique identification information for identifying the corresponding CMP content license.

The CMP content license creator information field 63 is a field into which CMP content license creator information that can identify a creator who generated a CMP content license (CCL) is inserted. For example, the CMP content license creator information may refer to identification information of the CMP module (CM) that generated the corresponding CMP content license (CCL).

The C / R scheme information field 64 is a field into which C / R scheme information associated with the corresponding CMP content CC is inserted. In this case, the C / R scheme information may refer to information for identifying a C / R scheme associated with the CMP content (CC).

The C / R scheme may mean a policy rule of a service provider side or a content protection system (eg, CAS or DRM) for the content. In such a C / R scheme, a plurality (eg, eight, etc.) may be associated with one CMP content CC. That is, a plurality of different policy rules determined by the service provider may be applied to one CMP content CC. The C / R scheme information may consist of a plurality of bits that may be set to '1' or '0', for example, to identify the C / R scheme associated with the CMP content.

The revocation information field 65 is a field into which revocation information of the corresponding CMP content CC is inserted. The revocation information includes information for finding an RL including information on a CMP device (or a CMP module) or a domain that restricts use of the corresponding CMP content (CC).

For example, the revocation information may mean an RL index list. At this point, the RL index revocation information field may include an RL index list that is a list of RL indexes. In this case, the RL index is information included in the RL and may be a number that increases by 1 whenever a new RL is issued. In other words, the RL index may refer to information for identifying the most recently issued RL. The RL index list is a list of RL indexes that allows the most recent RL to be found when using CMP content. On the other hand, if there is no need to apply RL when using content, the RL index list may be set to '0', for example. Can be set.

Authorized domain identification information field 66 is a field into which domain identification information is inserted. The domain identification information may refer to identification information of the domain 5 through which CPM content can be commonly used. If the CPM content CC can be used without being limited to the scope of the domain 5, the domain identification information may be set to '0', for example.

The descrambling information field 67 is a field into which descrambling information of the CMP content CC is inserted. The descrambling information may include information of a descrambler, descrambling key information, etc. which descrambled the CMP content CC.

The CMPI field 68 is a field into which the CMPI is inserted. The CMPI may refer to usage rules information for protecting and managing the CMP content CC in the CMP system 100. As mentioned above, the CMPI may include duplication and movement control information, consumption control information, delivery control information, output control information, additional control information, and the like of the CMP content CC.

The CMP content license management data information field 69 is a field into which the CMP content license management data information is inserted. The CMP Content License Management Data Information field 69 contains length information of the CMP Content License (CCL), issuer information that last issued the CMP Content License (CCL) (e.g., certificate information of the CMP module that last issued the CMP Content License). And the like).

The information contained in the CMP content license (CCL) is a license that controls the use rights of the content when performing the functions of the consumption module 40, the export module 50, the storage module 20, and the processing module 30 of the content. Can be used as information.

The consumption module 40 performs a function of consuming the CMP content CC, such as playing the CMP content CC sound or visually or outputting it through a digital or analog interface. For example, the consumption module may extract the descrambling key from the CMP content license (CCL) to consume the CMP content (CC), descramble the CMP content (CC), decode and output the decoded content, and output the decoded content to analog information. You can also convert and output or play. The consumption of the CMP content CC may be controlled according to consumption control information, output control information, etc. included in the CMPI of the CMP content license CCL.

The export module 50 may perform a function of exporting the CMP content CC to another CMP device. In order to export the CMP content CC, the control information included in the CMPI of the CMP content license CCL, C / R scheme information, revocation information, etc. of the CMP content license CCL may be considered. For example, even if the control information of the CMPI is allowed to be exported for a specific CMP content CC, the content may not be exported unless approved in the C / R system information.

The storage module 20 may perform a function of storing the CMP content CC in the CMP device CD. The storage of the CMP content CC may be controlled according to copy and movement control information included in the CMPI of the CMP content license CCL.

The processing module 30 may perform a function of processing the CMP content CC. For example, the processing module 30 may convert the CMP content CC into another compressed format, video resolution, video frame rate, and audio sampling rate. Transcoding, applying video or audio effects, inserting optional data or content elements, extracting still images from video streams, and the like.

FIG. 4 is a flowchart illustrating a flow of an information processing method according to an exemplary embodiment of the present invention, and illustrates a process of processing whether to apply RL according to revocation application information received by being included in service-related information of content.

Referring to FIG. 4, the CMP device may receive service related information of content from the outside (step S1). For example, the CMP device may receive an FTA broadcast signal from the service provider side. The service related information may include revocation application information, scrambling execution designation information, remote access control information, and the like.

The revocation application information is information indicating whether to apply a content revocation process for content. In this case, the content revocation process may refer to a process of checking a revocation list associated with the CMP content to prohibit access to a device (or a CMP module) or a domain present in the revocation list when the CMP content is accessed. have.

Such revocation application information may be one bit of information set to a specific value, for example, a first value (assuming '1' in this embodiment) or a second value (assuming '0' in this embodiment). In this case, when the revocation application information is set to '1', it may be instructed not to apply the content revocation processing, and when the revocation application information is set to '0', it may be instructed to apply the content revocation processing. have.

Meanwhile, the CMP module may convert the content into CMP content and generate a CMP content license associated with the CMP content.

After receiving the service related information, the CMP module extracts the revocation application information included in the service related information (step S2), and the extracted revocation application information is set to a first value (for example, '1'). Check whether it is set to a second value (eg, '0') (step S3).

At this time, when the revocation application information is set to the first value, the CMP module sets the specific information of the CMP content license to information indicating not to apply content revocation processing. For example, the CMP module sets the revocation information of the CMP content license, that is, the RL index list to '0', if the revocation application information is set to a value of '1' indicating not to apply the content revocation processing. (S4). Then, since the RL index list is '0' when using the CMP content, the content revocation process is not applied (step S5).

On the other hand, when the revocation application information is set to the second value, since the content revocation processing should be performed normally, the CMP module does not need to perform a special setting process. In this case, the revocation information of the CMP content license, that is, the RL index list, includes a list of RL indexes. Accordingly, when the content revocation process is performed, the RL index list may be viewed, and the most recently issued RL may be found to perform revocation processing (step S6).

As such, the content revocation processing of the specific content may not be applied by using the revocation application information transmitted through the FTA broadcast signal. This process can be used to transmit content that should be viewed by anyone without being restricted by the device or domain such as an emergency message or an announcement.

Meanwhile, the information on whether to perform scrambling included in the service related information may mean information indicating whether to apply scrambling for the purpose of content protection when generating CMP content. For example, the scrambling indication information may be 1 bit information set to a predetermined value, for example, '1' or '0'. In this case, when the information indicating whether to perform scrambling is set to '1', it indicates that the scrambling of the content is not to be performed, and when it is set to '0', it may be indicated to perform scrambling of the content.

Such scrambling indication information may be inserted into a specific field of the CMPI of the CMP content license associated with the corresponding content, for example, an additional control information insertion field.

In addition, the remote access control information included in the service related information may mean control information used to prevent unauthorized redistribution of content. The remote access control information may be two bits of information that may be set to four values, for example, '0', '1', '2', and '3'. For example, '0' may indicate that remote access is possible through the Internet or another transmission network, and that '1' to '3' may indicate that strict remote access is required in stages.

Such scrambling remote access control information may be inserted into a specific field of the CMPI of the CMP content license associated with the corresponding content, for example, a specific field of the delivery control information.

Hereinafter, a process of applying a revocation when delivering content from a service provider such as a broadcasting station to a CMP device and distributing the content to another CMP device (hereinafter referred to as an end point device) in the domain will be described.

First, a broadcasting station generates revocation application information for indicating whether to apply revocation of specific content. In this case, the revocation application information may be generated based on the property of the content. For example, since information such as an emergency message is preferably made available to all devices without applying revocation processing, revocation application information including information indicating not to apply revocation information may be generated.

Subsequently, the broadcasting station may transmit the revocation application information to the CMP device through, for example, a proto air signal. The CMP device may receive the revocation application information, and may apply or not apply the revocation processing for using the corresponding content according to the indication of the revocation application information.

For example, the CMP device may receive the revocation application information and determine the revocation process mode based on the revocation application information. Revocation information may be mapped based on the revocation process mode to distribute content to other devices in the domain. In this case, when the revocation process mode indicates an application mode, the revocation information may be mapped to restrict the export of content based on preset revocation information. When the revocation process mode indicates a non-application mode, The revocation information may be mapped so that the export of content is not limited based on preset revocation information. The attribute of the revocation application information may be based on at least one of content and device, and may be one of one-time and non-one-time. If the attribute is non-one-time, the CMP device may store the revocation application information.

Meanwhile, the endpoint device may receive the distributed content based on the revocation information from the CMP device, and then use the content according to preset authority information. In this case, the revocation information may be mapped based on a reporting process mode, and the revocation processing mode may be based on revocation application information.

Although the present invention has been described above with reference to its preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be practiced with modification. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

Claims (22)

Receiving revocation application information from an external system; Determining a revocation process mode based on the revocation application information; And Mapping revocation information based on the revocation process mode to distribute content to a device on a domain corresponding to an internal system. The method of claim 1, wherein the attribute of the revocation application information is based on at least one of a content and a device. The method of claim 1, wherein the attribute of the revocation application information is one of one-time and non-one-time, and when the attribute is non-one-time, the revocation application information is stored. The method of claim 1, wherein when the revocation process mode indicates an application mode, the mapping of the revocation information may include revocation information so that export of content is restricted based on preset revocation information. And mapping the content. The method of claim 1, wherein when the revocation process mode indicates a non-application mode, the mapping of the revocation information may include mapping the revocation information so that the export of content is not restricted based on preset revocation information. And protecting the content. The method of claim 1, wherein the revocation information includes information of a revocation list index list. Generating revocation application information based on the content attribute; And Transmitting the revocation application information to control distribution of the content based on the revocation application information, And a revocation process mode is determined based on the revocation application information, and the revocation information is mapped based on the revocation process mode. 8. The method of claim 7, wherein the attribute of the revocation application information is based on at least one of content and device. The method of claim 7, wherein the attribute of the revocation application information is one of one-time and non-one-time, and when the attribute is non-one-time, the revocation application information is stored. The method of claim 7, wherein when the revocation process mode indicates an application mode, the revocation information is mapped such that export of the content is limited based on preset revocation information. . 18. The method of claim 17, wherein when the revocation process mode indicates a non-application mode, the revocation information is mapped so that the export of the content is not restricted based on preset revocation information. The method of claim 1, wherein the revocation information includes information of a revocation list index list. Receiving the distributed content based on the revocation information; And And using the content according to preset rights information, wherein the revocation information is mapped based on a reproducing process mode, and the revocation process mode is based on revocation application information. The method of claim 13, wherein the attribute of the revocation application information is based on at least one of a content and a device. The method of claim 13, wherein the attribute of the revocation application information is one of one-time and non-one-time, and the revocation application information is stored when the attribute is non-one-time. The method of claim 13, wherein when the revocation process mode indicates an application mode, the revocation information is mapped such that export of the content is limited based on preset revocation information. . The method of claim 13, wherein when the revocation process mode indicates a non-application mode, the revocation information is mapped so that the export of the content is not restricted based on preset revocation information. The method of claim 13, wherein the revocation information includes information of a revocation list index list. In the information processing method using a content management and protection system, Receiving service related information including revocation application information of the content from the outside; And And applying or not applying content revocation processing to the content according to the revocation application information. 20. The apparatus of claim 19, wherein the revocation application information is set to one of a first value indicating not to apply the content revocation processing and a second value indicating to apply the content revocation processing. An information processing method characterized by the above-mentioned. The method of claim 20, wherein the revocation application information is set to the first value. Applying or not applying the content revocation processing, And setting specific information included in a content license associated with the content to a specific value not to apply the content revocation processing. 22. The method of claim 21, wherein the specific information is a revocation list index list associated with the content.

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