CN101179557A

Movatterモバイル変換

Info

Publication number: CN101179557A
Application number: CNA2006101382757A
Authority: CN
Inventors: 周志鹏; 周皓隽; 陈大港; 党沛; 冯雯洁; 李益民; 张仁宙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-11-10
Filing date: 2006-11-10
Publication date: 2008-05-14
Anticipated expiration: 2026-11-10
Also published as: CN101179557B

Abstract

本发明公开了获取内容许可信息的方法及系统，包括：许可信息请求设备利用内容对应的内容标识，向许可信息提供设备请求许可信息，许可信息提供设备在自身存储的许可信息中查找与接收到的内容标识匹配的一个或一个以上许可信息，并返回给许可信息请求设备；许可信息请求设备从当前拥有的与CID匹配的许可信息中选择一个或一个以上许可信息，并对所选定的许可信息进行相应操作。本发明通过内容标识从许可存储设备中获取与该内容标识对应的许可信息，提高了处理效率及用户体验，保证了许可请求设备在内容标识对应的所有许可中进行选择，达到了最优选择的目的。之外，本发明通过内容标识获取了许可证对应的标识，改进了现有获取内容许可信息的方案。

The invention discloses a method and system for obtaining content license information, comprising: a license information requesting device uses a content identifier corresponding to the content to request license information from a license information providing device, and the license information providing device searches and receives the license information in its own stored license information. The content identifier matches one or more license information, and returns to the license information requesting device; the license information requesting device selects one or more license information from the current license information that matches the CID, and the selected license information information and act accordingly. The present invention obtains the license information corresponding to the content ID from the license storage device through the content ID, improves processing efficiency and user experience, ensures that the license requesting device can select among all the licenses corresponding to the content ID, and achieves optimal selection. Purpose. In addition, the present invention obtains the identification corresponding to the license through the content identification, which improves the existing solution for obtaining content license information.

Description

Translated fromChinese

获取内容许可信息的方法及系统Method and system for acquiring content license information

技术领域technical field

本发明涉及数字版权管理(DRM，Digital Rights Management)技术，尤指一种获取内容许可信息的方法及系统。The present invention relates to digital rights management (DRM, Digital Rights Management) technology, especially a method and system for obtaining content license information.

背景技术Background technique

DRM主要通过权利限制和内容保护方案控制数字内容的使用，以保护数字内容所有者的合法权益。为了简便，下文将数字内容简称为内容。DRM mainly controls the use of digital content through rights restriction and content protection schemes to protect the legitimate rights and interests of digital content owners. For simplicity, digital content is referred to as content for short below.

内容的发行者(CI，Content Issuer)将内容进行加密，在用户需要使用内容时，购买加密的内容数据包并下载到终端设备上，授权发行者(RI，RightsIssuer)负责分发与内容相对应的许可证，该许可证包括内容解密密钥及对应内容的权限。终端设备只有同时拥有内容数据包和许可证，才能正常使用所购买的内容。本文将许可证中的对应内容的权限可称之为许可，与许可表达相关的信息统称之为许可信息。The content issuer (CI, Content Issuer) encrypts the content. When the user needs to use the content, purchase the encrypted content data package and download it to the terminal device. The authorized issuer (RI, RightsIssuer) is responsible for distributing the content corresponding to the content. A license, which includes a content decryption key and permissions for the corresponding content. Only when the terminal device has both the content data package and the license can it normally use the purchased content. In this paper, the authority of the corresponding content in the license can be called the license, and the information related to the expression of the license is collectively called the license information.

DRM终端设备利用设备的公钥解密得到许可证密钥，进而通过获得的许可证中的内容解密密钥解密内容，并根据获得的许可证中的权限信息控制用户对内容的具体使用。The DRM terminal device uses the public key of the device to decrypt to obtain the license key, and then decrypts the content through the content decryption key in the obtained license, and controls the specific use of the content by the user according to the permission information in the obtained license.

以开放移动联盟(OMA，Open Mobile Alliance)DRM标准为例，许可证采用权限对象(RO，Rights Object)的方式表示，RO中包含有权利、限制、密钥、签名等信息。对同一内容，可以制作包含不同权限的多个不同的RO。比如，对于某一文档文件，有的RO中设置有浏览、打印权利及对该RO的转移(MOVE)、复制(COPY)等权利，有的RO中只设置浏览权利等。Taking the Open Mobile Alliance (OMA, Open Mobile Alliance) DRM standard as an example, the license is expressed in the form of a Rights Object (RO, Rights Object), and the RO contains information such as rights, restrictions, keys, and signatures. For the same content, multiple different ROs with different permissions can be created. For example, for a certain document file, some ROs are set with browsing and printing rights, rights of transferring (MOVE), copying (COPY) to the RO, and some ROs are only set with browsing rights, etc.

RO可分为有状态RO和无状态RO。有状态RO中包含有对某种权利进行限制的信息，比如次数(count)、时间(包括时间段、累计时间等)等状态限制信息；而对于无状态RO中包含的所有权利均不做状态限制，无状态RO中所含权利均属于非消耗类权利，即对该权利的使用不会影响后续的使用。比如：如果某RO中包含有打印的权利及对打印次数的限制，那么，该RO为有状态RO；如果某RO中包含有打印、浏览等权利，而对这些权利均无状态限制，那么，该RO为无状态RO。RO can be divided into stateful RO and stateless RO. A stateful RO contains information that restricts a certain right, such as the number of times (count), time (including time period, cumulative time, etc.) and other state restriction information; while all rights contained in a stateless RO do not state Restriction, the rights contained in the stateless RO are all non-consumable rights, that is, the use of this right will not affect the subsequent use. For example: if a certain RO contains printing rights and restrictions on the number of printing times, then the RO is a stateful RO; if a certain RO contains printing, browsing and other rights, and there are no state restrictions on these rights, then, This RO is a stateless RO.

OMA DRM标准组织发布了安全可移动的媒介存储装置(SRM，SecureRemovable Media)的框架标准。SRM可以存储内容或许可证，SRM包含一个SRM代理(SRM Agent)，用以实现对SRM上存储内容或许可证的管理及保护其它DRM设备对其的合法访问。SRM既可以是一个安全存储卡，也可以是一个智能卡。需要请求内容或许可的终端设备，可以通过物理接口访问SRM并获取其中存储的内容或许可证。SRM标准规定，SRM卡应支持对SRM上许可实现完全的读取、删除、更新等操作。DRM代理(DRM Agent，或称为DRM终端)与SRM Agent之间可以实现许可的转移或复制(COPY)，DRM终端也可消费SRM上存储的权限，但SRM不能消费自身存有的权限。在OMA DRM标准中定义了MOVE操作，一个DRM设备将其上的某RO中的权限转移给另一DRM设备，转移完成后，接收设备即可使用接收的权限，而移出设备删除转移出的权限。在OMA DRM标准中定义了复制(COPY)操作，一个DRM设备将其上的某RO中的权限拷贝给另一DRM设备，复制目的设备即可使用接收的权限，而复制源设备上的原权限保持不变。The OMA DRM standard organization released the framework standard for Secure Removable Media Storage (SRM, Secure Removable Media). SRM can store content or license, and SRM includes an SRM agent (SRM Agent), which is used to realize the management of stored content or license on SRM and protect the legal access of other DRM devices to it. SRM can be either a secure memory card or a smart card. End devices that need to request content or licenses can access the SRM through a physical interface and obtain the content or licenses stored therein. The SRM standard stipulates that the SRM card should support operations such as complete reading, deleting, and updating of licenses on the SRM. The transfer or copy (COPY) of the license can be realized between the DRM agent (DRM Agent, or DRM terminal) and the SRM Agent, and the DRM terminal can also consume the permissions stored on the SRM, but the SRM cannot consume the permissions stored by itself. The MOVE operation is defined in the OMA DRM standard. A DRM device transfers the rights in a certain RO on it to another DRM device. After the transfer is completed, the receiving device can use the received rights, and the moving device deletes the transferred rights. . The copy (COPY) operation is defined in the OMA DRM standard. A DRM device copies the rights in a certain RO on it to another DRM device. The copy destination device can use the received rights, and copy the original rights on the source device. constant.

DRM终端设备在需要使用某个内容时，需要获取该内容的使用权限。图1是在OMA SRM标准草案中，DRM终端从SRM上获取内容使用权限的流程图，如图1所示，该流程包括以下步骤：When a DRM terminal device needs to use a certain content, it needs to obtain the usage permission of the content. Figure 1 is a flow chart of the DRM terminal obtaining content usage rights from the SRM in the draft OMA SRM standard. As shown in Figure 1, the process includes the following steps:

步骤100：DRM代理向SRM代理发送权限请求消息(Rights_Retrieval_Message_request)，该权限请求消息中携带有请求获取的RO的标识符(RID)信息。Step 100: the DRM agent sends a rights request message (Rights_Retrieval_Message_request) to the SRM agent, and the rights request message carries the identifier (RID) information of the requested RO.

本步骤中，权限请求消息中携带的RID为一个，如果DRM终端需要使用的内容对应有多个RO，那么，需要发送多次权限请求消息来获取不同RID对应的RO。In this step, one RID is carried in the permission request message. If the content to be used by the DRM terminal corresponds to multiple ROs, multiple permission request messages need to be sent to obtain ROs corresponding to different RIDs.

步骤101～步骤102：SRM代理在自身存储的RO中，查找与接收到的RID匹配的RO，并将相应的RO携带在权限响应消息(Rights_Retrieval_Message_response)中返回给DRM代理。Step 101-Step 102: The SRM agent searches for the RO that matches the received RID among the ROs stored in itself, and returns the corresponding RO to the DRM agent in a rights response message (Rights_Retrieval_Message_response).

本步骤中，如果SRM代理不能找到与接收到的RID匹配的RO，则将权限请求响应消息中的错误码设置为“未找到RO”后返回给DRM代理。In this step, if the SRM agent cannot find the RO matching the received RID, it sets the error code in the permission request response message to "RO not found" and returns it to the DRM agent.

步骤103：DRM代理从当前拥有的RO中选择一个RO。Step 103: the DRM agent selects an RO from currently owned ROs.

本步骤中，DRM代理按照预先设置的选择策略，从自身存储有的RO(如果存在)及从SRM代理接收到的RO中选择一个RO。当然如果DRM代理中不存在RO且从SRM代理上返回的只有一个RO，则可以无需选择，直接使用该获得的RO即可。In this step, the DRM agent selects an RO from the RO stored in itself (if it exists) and the RO received from the SRM agent according to a preset selection policy. Of course, if there is no RO in the DRM agent and there is only one RO returned from the SRM agent, the obtained RO can be used directly without selection.

这里，选择策略可以是按照RO的有效期，和/或RO中所包含权限等信息来设置。比如设置选择策略为选择RO中为当前可使用次数权限最少的，假设DRM代理中自身存在一RO1，RO1中包含的使用次数为无限制、接收到的来自SRM代理的RO2中包含的使用次数权限为五次、接收到的来自SRM代理的RO3中包含的使用次数权限为十次，则DRM代理选择当前可使用次数最少的RO2。Here, the selection policy may be set according to the validity period of the RO, and/or information such as rights contained in the RO. For example, set the selection strategy to select the RO with the least permission for the current number of uses. Suppose there is a RO1 in the DRM agent itself, and the number of uses contained in RO1 is unlimited, and the number of uses included in RO2 received from the SRM agent. five times, and the RO3 received from the SRM agent contains ten usage times, then the DRM agent selects the RO2 with the least number of usages currently available.

步骤104～步骤106：如果DRM代理选择使用从SRM代理返回的某个RO，则向SRM代理发送锁定请求消息(Rights_Lock_Message_request)，指定锁定选定的RO；SRM代理锁定相应的RO，并向DRM代理返回权限锁定响应消息(Rights_Lock_Message_response)。Steps 104 to 106: If the DRM agent chooses to use a certain RO returned from the SRM agent, then send a lock request message (Rights_Lock_Message_request) to the SRM agent, specifying to lock the selected RO; the SRM agent locks the corresponding RO, and sends a request to the DRM agent Returns the rights lock response message (Rights_Lock_Message_response).

被锁定的RO只有被解锁后才能再次被其它DRM终端使用。DRM代理收到SRM已将选定的RO锁定的权限锁定响应消息后，即在后续利用所选定的RO来使用对应的内容。The locked RO can be used by other DRM terminals only after being unlocked. After receiving the rights lock response message that the SRM has locked the selected RO, the DRM agent uses the selected RO to use the corresponding content.

从上述现有获取内容访问权限的方法来看，DRM代理是通过已获知的内容所对应的多个RO的RID，向SRM代理请求RO的，但是，现有标准中并没有提供DRM是如何获取RID的方法，使得图1所示的方案不完整。而且，由于DRM代理通过RID向SRM代理请求RO，如果DRM代理已知在SRM上存有自身所需内容的多个RO，并且已知这些RO的RID信息，那么，DRM代理会通过多次发送权限请求消息，以分别从SRM中索取各RO。很显然，这种多次索取的方法，过程较繁索，降低了获取内容许可信息的效率。From the above-mentioned existing methods of obtaining content access rights, the DRM agent requests the RO from the SRM agent through the RIDs of multiple ROs corresponding to the known content. However, the existing standards do not provide how to obtain the DRM The method of RID makes the scheme shown in Fig. 1 incomplete. Moreover, since the DRM agent requests ROs from the SRM agent through the RID, if the DRM agent knows that there are multiple ROs with the content it needs on the SRM, and the RID information of these ROs is known, then the DRM agent will send Rights Request message to request ROs from SRM respectively. Obviously, this method of requesting multiple times is a complicated process, which reduces the efficiency of obtaining content license information.

另外，在步骤101～步骤102中，SRM代理是将匹配的RO的完整信息返回了DRM代理，其实，DRM代理为了实现对多个RO进行选择，只需获取用以进行选择的信息如使用次数权限等。因此，现有将多个RO及其状态信息完整地发送给DRM代理，造成了信息的冗余，增加了消息的长度。即增加了交互消息中信息冗余。In addition, in steps 101 to 102, the SRM agent returns the complete information of the matching RO to the DRM agent. In fact, in order to realize the selection of multiple ROs, the DRM agent only needs to obtain the information used for selection, such as the number of times of use. permissions etc. Therefore, currently, multiple ROs and their state information are completely sent to the DRM agent, resulting in redundancy of information and increasing the length of the message. That is, information redundancy in the interactive message is increased.

此外，DRM代理对于SRM上存有的RO的信息并不一定完全了解，其可能并不掌握SRM中自身需要使用的内容所对应的所有RO的RID，这样，很可能不能完全获取SRM代理中对应该内容的所有的RO，假设SRM代理中存在一个RO即将过有效期，而本次DRM代理未索取该RO，就可能会造成该RO失效，对用户造成了经济损失。In addition, the DRM agent does not necessarily fully understand the information of the ROs stored in the SRM, and it may not know the RIDs of all the ROs corresponding to the content that it needs to use in the SRM. For all the ROs that should contain content, assuming that there is an RO in the SRM agent that is about to expire, and the DRM agent does not claim the RO this time, it may cause the RO to become invalid and cause economic losses to the user.

发明内容Contents of the invention

有鉴于此，本发明的主要目的在于提供一种获取内容许可信息的方法，能够提高获取内容许可信息的效率。In view of this, the main purpose of the present invention is to provide a method for obtaining content license information, which can improve the efficiency of obtaining content license information.

本发明的另一目的在于提供一种获取内容许可信息的方法，能够改进现有获取内容许可信息的方案。Another object of the present invention is to provide a method for obtaining content license information, which can improve the existing solution for obtaining content license information.

本发明的又一目的在于提供两种获取内容许可信息的系统，能够提高获取内容许可信息的效率。Another object of the present invention is to provide two systems for obtaining content license information, which can improve the efficiency of obtaining content license information.

为达到上述目的，本发明的技术方案具体是这样实现的：In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

一种获取内容许可信息的方法，该方法包括以下步骤：A method for obtaining content license information, the method includes the following steps:

A.许可信息请求设备利用内容对应的内容标识CID，向许可信息提供设备请求许可信息；A. The license information requesting device uses the content identifier CID corresponding to the content to request license information from the license information providing device;

B.许可信息提供设备在自身存储的许可信息中查找与接收到的CID匹配的一个或一个以上许可信息，并返回给许可信息请求设备；B. The license information providing device searches the license information stored in itself for one or more license information matching the received CID, and returns it to the license information requesting device;

C.许可信息请求设备从当前拥有的与CID匹配的许可信息中选择一个或一个以上许可信息，并对所选定的许可信息进行相应操作。C. License information request The device selects one or more license information from the current license information that matches the CID, and performs corresponding operations on the selected license information.

步骤C中所述选择的方法为：所述许可信息请求设备按照预先设置的选择策略或通过用户选择，从自身当前拥有的许可信息中选择一个或一个以上许可信息。The selection method in step C is: the license information requesting device selects one or more pieces of license information from the license information it currently owns according to a preset selection strategy or through user selection.

步骤A中还包括，所述许可信息请求设备将表示是否要求许可信息提供设备进行选择的选择标识，以及选择条件发送给许可信息提供设备；Step A also includes that the license information requesting device sends a selection flag indicating whether to require the license information providing device to make a selection, and the selection condition to the license information providing device;

若所述选择标识显示要求进行选择，步骤B中所述返回许可信息之前，该方法还包括：所述许可信息提供设备按照接收到的选择条件，在与CID匹配的所有许可信息中选择满足所述选择条件的许可信息，再按照预先设置的选择策略或通过用户选择，从中选择一个或一个以上许可信息。If the selection sign shows that a selection is required, before returning the license information in step B, the method further includes: the license information providing device selects all license information matching the CID according to the received selection condition According to the permission information of the above selection conditions, one or more pieces of permission information are selected according to the preset selection strategy or selected by the user.

步骤A中还包括，所述许可信息请求设备将表示是否要求许可信息提供设备进行选择的选择标识发送给许可信息提供设备；Step A also includes that the license information requesting device sends a selection identifier indicating whether to require the license information providing device to make a selection to the license information providing device;

若所述选择标识显示要求进行选择，步骤B中所述返回许可信息之前，该方法还包括：所述许可信息提供设备按照自身预先设置的选择策略或通过用户选择，从与CID匹配的所有许可信息中选择一个或一个以上许可信息。If the selection sign shows that a selection is required, before returning the license information in step B, the method further includes: the license information providing device selects from all licenses matching the CID according to its preset selection strategy or through user selection. Select one or more license information in the information.

在所述许可信息提供设备中预先配置是否进行自动选择的选择标识；Pre-configuring in the license information providing device a selection flag indicating whether to perform automatic selection;

若所述选择标识显示要求进行选择，步骤B中所述返回许可信息之前，该方法还包括：所述许可信息提供设备按照自身预先设置的选择策略，从与CID匹配的所有许可信息中选择一个或一个以上许可信息。If the selection sign shows that a selection is required, before returning the license information in step B, the method further includes: the license information providing device selects one from all license information matching the CID according to its preset selection strategy. or more than one license information.

步骤A中还包括，所述许可信息请求设备将选择条件发送给许可信息提供设备；Step A also includes that the license information requesting device sends the selection condition to the license information providing device;

步骤B中所述返回许可信息之前，该方法还包括：所述许可信息提供设备从与CID匹配的所有许可信息中选择出符合所述选择条件的许可信息，再按照自身预先设置的选择策略或通过用户选择，从符合所述选择条件的许可信息中选取一个或一个以上许可信息。Before returning the license information in step B, the method further includes: the license information providing device selects the license information that meets the selection condition from all the license information that matches the CID, and then selects the license information according to its preset selection strategy or Select one or more pieces of license information from the license information meeting the selection condition through user selection.

步骤B中所述返回许可信息之前，该方法还包括：Before returning the license information described in step B, the method further includes:

所述许可信息提供设备按照预先设置的选择策略或通过用户选择，从与CID匹配的所有许可信息中选择一个或一个以上许可信息。The license information providing device selects one or more pieces of license information from all license information matching the CID according to a preset selection strategy or through user selection.

所述许可信息为许可证及其状态信息，或者许可证的标识信息及其状态信息。The permission information is the license and its state information, or the identification information of the license and its state information.

所述状态信息包括全部或部分权限信息。The state information includes all or part of permission information.

所述许可信息请求设备为终端、服务器或安全存储设备；所述许可信息提供设备为终端、服务器或安全存储设备。The permission information requesting device is a terminal, a server or a safe storage device; the permission information providing device is a terminal, a server or a safe storage device.

所述终端为数字版权管理DRM终端设备，所述安全存储设备为安全可移动的媒介存储装置SRM。The terminal is a digital rights management DRM terminal device, and the safe storage device is a safe removable media storage device SRM.

步骤C中所述操作为：所述许可信息请求设备请求许可信息提供设备转移或复制所述选定的许可信息；The operation in step C is: the license information requesting device requests the license information providing device to transfer or copy the selected license information;

或者，所述许可信息请求设备向许可信息提供设备请求消费所述选定的许可权限。Alternatively, the license information requesting device requests the license information providing device to consume the selected license right.

I.许可信息请求设备利用内容对应的内容标识CID，向许可信息提供设备请求与所述CID对应的许可证标识信息，许可信息提供设备将对应的一个或一个以上许可证标识返回给许可信息请求设备；I. The license information requesting device uses the content identification CID corresponding to the content to request the license identification information corresponding to the CID from the license information providing device, and the license information providing device returns one or more corresponding license identifications to the license information requesting device equipment;

II.许可信息请求设备向许可信息提供设备请求一个或一个以上与获得的许可证的标识信息对应的许可，许可信息提供设备将对应的许可返回给许可信息请求设备；II. The license information requesting device requests one or more licenses corresponding to the obtained license identification information from the license information providing device, and the license information providing device returns the corresponding license to the license information requesting device;

III.所述许可信息请求设备从当前拥有的许可信息中选择一个或一个以上许可信息，并对所选定的许可信息进行相应操作。III. The license information requesting device selects one or more license information from currently owned license information, and performs corresponding operations on the selected license information.

还包括：步骤I中，所述许可信息提供设备同时向许可信息请求设备返回与CID对应的一个或一个以上许可证中的许可状态信息，许可信息请求设备按照预先设置的选择策略或通过用户选择，选择一个或一个以上的许可证；It also includes: in step I, the license information providing device returns the license status information in one or more licenses corresponding to the CID to the license information requesting device at the same time, and the license information requesting device follows a preset selection policy or selects the license information through the user. , select one or more licenses;

步骤II中许可信息请求设备向许可信息提供设备请求与所选择的许可证的标识信息对应的许可。In step II, the license information requesting device requests a license corresponding to the identification information of the selected license from the license information providing device.

该方法还包括：步骤I中，所述许可信息请求设备将选择条件发送给许可信息提供设备；The method also includes: in step I, the license information requesting device sends the selection condition to the license information providing device;

步骤II中所述返回许可之前，该方法还包括：所述许可信息提供设备按照来自许可信息请求设备的选择条件，从与所述许可证的标识信息对应的许可中选择出符合该选择条件的许可。Before returning the license in step II, the method further includes: the license information providing device selects the license that meets the selection condition from the licenses corresponding to the identification information of the license according to the selection condition from the license information requesting device. license.

步骤II中所述返回许可之前，该方法还包括：Before returning the license as described in step II, the method also includes:

所述许可信息提供设备按照预先设置的选择条件或通过用户选择，从选定的许可中选择一个或一个以上许可。The license information providing device selects one or more licenses from the selected licenses according to preset selection conditions or through user selection.

步骤III中所述操作为：所述许可信息请求设备请求许可信息提供设备转移或复制所述选定的许可信息；The operation in step III is: the license information requesting device requests the license information providing device to transfer or copy the selected license information;

或者，所述许可信息请求设备向许可信息提供设备请求消费所述选定的许可信息。Alternatively, the license information requesting device requests the license information providing device to consume the selected license information.

一种获取内容许可信息的系统，该系统包括：许可信息请求设备和许可信息提供设备，其中：A system for acquiring content license information, the system comprising: a license information requesting device and a license information providing device, wherein:

许可信息请求设备，用于向许可信息提供设备发送携带有内容对应的CID的许可信息检索请求，接收来自许可提供设备的许可信息，并从当前拥有的许可信息中选择一个或一个以上许可信息，对所选定的许可信息进行相应操作；The license information requesting device is configured to send a license information retrieval request carrying a CID corresponding to the content to the license information providing device, receive license information from the license providing device, and select one or more license information from currently owned license information, Perform corresponding operations on the selected license information;

许可信息提供设备，用于接收来自许可信息请求设备的许可信息检索请求，向许可信息请求设备返回与接收到的CID匹配的许可信息。The license information providing device is configured to receive the license information retrieval request from the license information requesting device, and return the license information matching the received CID to the license information requesting device.

所述许可信息请求设备为DRM终端设备，所述许可信息提供设备为SRM设备。The license information requesting device is a DRM terminal device, and the license information providing device is an SRM device.

许可信息请求设备，用于向许可信息提供设备发送携带有内容对应的CID的许可信息检索请求，接收来自许可提供设备的许可证标识信息，向许可信息提供设备请求与获得的许可证的标识信息对应的许可，接收来自许可信息提供设备返回的许可信息，并从当前拥有的许可信息中选择一个或一个以上许可，并对所选定的许可信息进行相应操作；The license information requesting device is configured to send the license information retrieval request carrying the CID corresponding to the content to the license information providing device, receive the license identification information from the license providing device, and provide the license information providing device with the identification information of the license requested and obtained For the corresponding license, receive the license information returned from the license information providing device, select one or more licenses from the currently owned license information, and perform corresponding operations on the selected license information;

许可信息提供设备，用于接收来自许可信息请求设备的许可信息检索请求，向许可信息请求设备返回与接收到的CID匹配的许可证标识信息，接收来自许可信息请求设备的许可证的标识信息，向许可信息请求设备返回的许可信息。a license information providing device, configured to receive a license information retrieval request from a license information requesting device, return license identification information matching the received CID to the license information requesting device, and receive license identification information from the license information requesting device, The license information returned by the license information request device.

由上述技术方案可见，本发明通过内容标识从许可信息提供设备中获取与该内容标识对应的许可信息，减少了原有方案中索取许可的消息交互次数，减少了设备负担，提高了处理效率及用户体验。而且，保证了许可请求设备在内容标识对应的所有许可中进行选择，防止了遗漏选择的风险，达到了最优选择的目的。之外，本发明通过内容标识获取对应许可证的标识，改进了现有获取内容许可信息的方案。It can be seen from the above technical solution that the present invention obtains the license information corresponding to the content ID from the license information providing device through the content ID, which reduces the number of message interactions for requesting licenses in the original solution, reduces the burden on the equipment, and improves the processing efficiency and efficiency. user experience. Moreover, it is ensured that the license requesting device selects from all the licenses corresponding to the content identifier, avoiding the risk of missing selection, and achieving the purpose of optimal selection. In addition, the present invention obtains the identification of the corresponding license through the content identification, which improves the existing solution for obtaining content license information.

附图说明Description of drawings

图1是现有技术DRM代理从SRM上获取内容许可信息的流程图；Fig. 1 is the flowchart of prior art DRM agent obtaining content licensing information from SRM;

图2是本发明方法的流程图；Fig. 2 is a flow chart of the inventive method;

图3是本发明实施例一的流程图；Fig. 3 is a flowchart of Embodiment 1 of the present invention;

图4是本发明实施例二的流程图；Fig. 4 is the flowchart of the second embodiment of the present invention;

图5是本发明实施例三的流程图；Fig. 5 is a flowchart of Embodiment 3 of the present invention;

图6是本发明实施例四的流程图。Fig. 6 is a flow chart of Embodiment 4 of the present invention.

具体实施方式Detailed ways

本发明的核心思想是：许可信息请求设备利用内容对应的内容标识，向许可信息提供设备请求许可信息，许可信息提供设备在自身存储的许可信息中，查找与接收到的内容标识匹配的一个或一个以上许可信息并返回给许可信息请求设备；许可信息请求设备从当前拥有的许可信息中选择一个或一个以上许可信息，并对所选定的许可信息进行相应操作。The core idea of the present invention is: the license information requesting device uses the content ID corresponding to the content to request license information from the license information providing device, and the license information providing device searches for a license information that matches the received content ID in the license information stored by itself or More than one piece of license information is returned to the license information requesting device; the license information requesting device selects one or more pieces of license information from the currently owned license information, and performs corresponding operations on the selected license information.

为使本发明的目的、技术方案及优点更加清楚明白，以下参照附图并举较佳实施例，对本发明进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

图2是本发明方法的流程图，如图2所示，本发明获取许可访问权限的方法包括以下步骤：Fig. 2 is the flowchart of the method of the present invention, as shown in Fig. 2, the method for obtaining permission access authority of the present invention comprises the following steps:

步骤200：许可信息请求设备向许可信息提供设备发送许可信息检索请求，该许可信息检索请求中携带有许可信息请求设备需要使用的内容对应的内容标识(CID)。Step 200: The license information requesting device sends a license information retrieval request to the license information providing device, and the license information retrieval request carries a content identifier (CID) corresponding to the content to be used by the license information requesting device.

许可信息请求设备为终端、服务器或安全存储设备等需要为内容请求许可信息的设备；所述许可信息提供设备为终端、服务器或安全存储设备等存储有内容许可信息的设备。比如在OMA SRM标准草案中，许可信息请求设备可以是DRM终端设备，许可信息提供设备可以是SRM设备。The license information requesting device is a device that needs to request license information for content, such as a terminal, server, or secure storage device; the license information providing device is a device that stores content license information, such as a terminal, server, or secure storage device. For example, in the OMA SRM standard draft, the license information requesting device can be a DRM terminal device, and the license information providing device can be an SRM device.

步骤201～步骤202：许可信息提供设备在自身存储的许可信息中，查找与接收到的CID匹配的许可信息，并将匹配的一个或一个以上许可信息携带在许可检索响应消息中返回给许可信息请求设备。Steps 201 to 202: The license information providing device searches for the license information that matches the received CID in the license information stored by itself, and returns one or more matching license information in the license retrieval response message to the license information Request equipment.

本步骤中，如果许可信息提供设备不能找到与接收到的CID匹配的许可信息，可以向许可信息请求设备返回失败响应。In this step, if the license information providing device cannot find the license information matching the received CID, it may return a failure response to the license information requesting device.

步骤203：许可信息请求设备从当前拥有的与CID_A对应的许可信息中选择一个或一个以上许可信息。Step 203: The license information requesting device selects one or more pieces of license information from the current license information corresponding to CID_A.

本步骤中，许可信息请求设备按照预先设置的选择策略自动选择或是提示由用户选择，从自身当前拥有的许可信息，包括存储有的许可信息(如果存在)及从许可信息提供设备接收到的许可信息中选择一个或一个以上许可信息。当然如果许可信息请求设备中不存在许可信息，且从许可信息提供设备返回的只有一个许可信息，则可以无需选择，直接使用该获得的许可信息即可。In this step, the license information requesting device automatically selects according to a preset selection policy or prompts the user to select, from the license information currently owned by itself, including the stored license information (if it exists) and the license information received from the license information providing device. Select one or more license information in License Information. Of course, if there is no license information in the license information requesting device, and there is only one license information returned from the license information providing device, the obtained license information can be directly used without selection.

这里，自动选择时所采用的选择策略的设置方法与现有方法相同，比如针对某内容对应的多个许可信息，按照下述顺序进行选择：Here, the setting method of the selection strategy used in automatic selection is the same as the existing method. For example, for multiple license information corresponding to a certain content, the selection is performed in the following order:

1、无状态的许可信息；2、所有权限有日期限制的许可信息；3、对于多个有日期限制的许可信息，其结束日期最近的优先使用等。1. Stateless license information; 2. License information with date limits for all permissions; 3. For multiple date-limited license information, the one with the latest end date will be used first.

具体策略实现这里不再赘述。The implementation of specific strategies will not be repeated here.

步骤204：许可信息请求设备对所选定的许可信息进行相应操作。Step 204: The license information requesting device performs corresponding operations on the selected license information.

本步骤中的操作包括：请求许可信息提供设备MOVE或复制该选定的许可信息、或者许可请求设备向许可信息提供设备请求消费该许可信息等。The operations in this step include: requesting the license information providing device to MOVE or copy the selected license information, or the license requesting device to request the license information providing device to consume the license information, etc.

需要说明的是，步骤204许可信息请求设备可能同时操作所选择的一个以上许可，如一次要求MOVE多个许可。It should be noted that, in step 204, the license information requesting device may operate more than one selected license at the same time, such as requesting MOVE multiple licenses at a time.

从图2所示的本发明获取内容许可信息的方法可以看出，许可信息请求设备是通过内容所对应的内容标识，向许可信息提供设备请求该内容对应的所有许可信息，这样，许可信息请求设备可以通过发起一次请求，从许可信息提供设备中获取与该内容对应的全部许可信息。显然，本发明方法减少了索取的次数，使得请求过程简单，从而提高了获取内容许可信息的效率。It can be seen from the method for obtaining content license information of the present invention shown in FIG. 2 that the license information requesting device requests all license information corresponding to the content from the license information providing device through the content identification corresponding to the content. In this way, the license information request The device may obtain all license information corresponding to the content from the license information providing device by initiating a request. Apparently, the method of the present invention reduces the number of requests, makes the request process simple, and thus improves the efficiency of obtaining content license information.

下面以OMA SRM标准系统为例，详细描述本发明方法的具体实现方式。Taking the OMA SRM standard system as an example, the specific implementation of the method of the present invention will be described in detail below.

在OMA DRM标准系统中，许可信息请求设备为DRM代理，许可信息提供设备为SRM代理。假设，在SRM代理中存储有内容如电影A的两个RO即RO2和RO3及各RO状态信息，两个RO中均限制了电影A的播放次数，但是RO2中的有效期还有2天到期，而RO3中的有效期还有200天到期。同时假设，RO2包含权限有：MOVE权限，当前还可MOVE2次，当前可播放次数为5次；RO3包含权限有：当前可播放次数为10次。电影A的内容标识为CID_A，且DRM代理中已存储有电影A的内容文件。In the OMA DRM standard system, the license information requesting device is a DRM agent, and the license information providing device is an SRM agent. Assume that two ROs of movie A, namely RO2 and RO3, and the state information of each RO are stored in the SRM agent. The number of times movie A can be played is limited in both ROs, but the validity period in RO2 expires in 2 days. , and the validity period in RO3 expires in 200 days. At the same time, it is assumed that RO2 includes permissions: MOVE permission, currently can MOVE 2 times, and the current playable times is 5; RO3 includes permissions: the current playable times is 10 times. The content identifier of movie A is CID_A, and the content file of movie A has been stored in the DRM agent.

如果DRM代理希望播放电影A，有两种方式，一种是从SRM代理处转移一个RO到本地后再消费，另一种是直接消费存储于SRM中RO的权限。If the DRM agent wants to play movie A, there are two ways, one is to transfer an RO from the SRM agent to the local and then consume it, and the other is to directly consume the rights of the RO stored in the SRM.

图3是本发明将SRM中的RO执行MOVE操作转移至DRM代理中消费的实施例一的流程图，如图3所示，本实施例一包括以下步骤：Fig. 3 is the flow chart of embodiment 1 that the present invention transfers RO in SRM to execute MOVE operation and consumes in DRM agent, as shown in Fig. 3, present embodiment 1 comprises the following steps:

步骤300：DRM代理向SRM代理发送许可检索请求，该许可检索请求中携带有DRM代理需要使用的内容即电影A对应的内容标识(CID_A)。Step 300: The DRM agent sends a license retrieval request to the SRM agent, and the license retrieval request carries the content to be used by the DRM agent, that is, the content identifier (CID_A) corresponding to movie A.

步骤30 1～步骤302：SRM代理在自身存储的RO中，查找与接收到的CID A匹配的RO，并将匹配的所有RO即RO2和RO3及各自的状态信息携带在许可检索响应消息中返回给DRM代理。Step 301-Step 302: The SRM agent searches for ROs that match the received CIDA in its own stored ROs, and returns all matching ROs, namely RO2 and RO3 and their respective status information, in the license retrieval response message to the DRM agent.

本步骤中，RO2的状态信息包括：有效期为还有2天到期、MOVE权限、播放权限、当前允许播放次数5次；RO3的状态信息包括：有效期为还有200天到期、播放权限、当前允许播放次数10次。In this step, the status information of RO2 includes: the validity period expires in 2 days, MOVE permission, playback permission, and the current allowed playback times 5 times; the status information of RO3 includes: the validity period expires in 200 days, playback permission, Currently allowed to play 10 times.

步骤303：DRM代理从当前拥有的与CID A对应的许可中选择一个许可。Step 303: the DRM agent selects a license from currently owned licenses corresponding to CIDA.

本实施例中，假设DRM代理中不存在与电影A对应的RO，因此DRM代理在RO2和RO3中进行选择。In this embodiment, it is assumed that there is no RO corresponding to movie A in the DRM agent, so the DRM agent selects from RO2 and RO3.

假设用户指示DRM代理，选择具有MOVE权限且即将过期的RO，因为RO2当前具有MOVE权限，其有效期即将到期，因此DRM代理选择将RO2转移到本地后消费。Assume that the user instructs the DRM agent to select an RO that has MOVE authority and is about to expire, because RO2 currently has the MOVE authority and its validity period is about to expire, so the DRM agent chooses to transfer RO2 to the local area for consumption.

步骤304：DRM代理向SRM代理请求转移选定的RO2。Step 304: The DRM agent requests the SRM agent to transfer the selected RO2.

步骤305：SRM代理收到来自DRM代理的转移RO2请求，假设允许将RO2转移给DRM代理，则删除自身存储的RO2。Step 305: The SRM agent receives the RO2 transfer request from the DRM agent, and if RO2 is allowed to be transferred to the DRM agent, deletes the RO2 stored by itself.

步骤306：SRM代理向DRM代理发送转移确认消息。Step 306: the SRM agent sends a transfer confirmation message to the DRM agent.

如果SRM代理是允许将RO2转移给DRM代理，则转移确认消息中携带有转移成功信息；如果SRM代理是不允许将RO2转移给DRM代理，则转移确认消息中携带有不允许安装信息。If the SRM agent is allowed to transfer RO2 to the DRM agent, the transfer confirmation message carries transfer success information; if the SRM agent does not allow RO2 to be transferred to the DRM agent, then the transfer confirmation message carries installation disallowed information.

若DRM代理收到SRM不允许转移RO2的转移确认消息，DRM代理可按照步骤304的方式进一步向SRM发送转移其它与电影A相对应的具有转移权限的RO的请求。If the DRM agent receives the transfer confirmation message that the SRM does not allow the transfer of RO2, the DRM agent may further send a request to the SRM to transfer other ROs corresponding to movie A that have transfer rights in the manner of step 304 .

步骤307：DRM代理收到SRM代理的转移成功确认消息后，将RO2安装在本地。Step 307: The DRM agent installs the RO2 locally after receiving the transfer success confirmation message from the SRM agent.

这样，DRM代理就可以消费RO2中的权限了。In this way, the DRM agent can consume the rights in RO2.

本实施例还可以进一步包括步骤308，如下：This embodiment may further include step 308, as follows:

步骤308：DRM代理将暂时不使用的RO3删除。Step 308: The DRM agent deletes the temporarily unused RO3.

需要说明的是，步骤305中的删除操作与步骤306可互换次序；步骤307中的安装操作与步骤308可互换次序。It should be noted that the delete operation in step 305 and step 306 can be interchanged in order; the installation operation in step 307 and step 308 can be interchanged in order.

需要说明的是，步骤303中，DRM代理也可选择一个以上许可。若是选择了SRM代理传来的多个许可，例如选择RO2及RO3，在步骤304中可以请求转移RO2及RO3。It should be noted that, in step 303, the DRM agent may also select more than one license. If multiple licenses from the SRM agent are selected, for example RO2 and RO3 are selected, in step 304 transfer of RO2 and RO3 can be requested.

图4是本发明DRM代理直接消费存储于SRM代理中RO的权限的实施例二的流程图，如图4所示，本实施例包括以下步骤：Fig. 4 is the flow chart of the second embodiment of the DRM agent of the present invention directly consuming the rights stored in the RO in the SRM agent. As shown in Fig. 4, this embodiment includes the following steps:

步骤400：DRM代理向SRM代理发送许可检索请求，该许可检索请求中携带有DRM代理需要使用的内容即电影A对应的内容标识(CID_A)。Step 400: The DRM agent sends a license retrieval request to the SRM agent, and the license retrieval request carries the content to be used by the DRM agent, that is, the content identifier (CID_A) corresponding to movie A.

步骤401～步骤402：SRM代理在自身存储的RO中，查找与接收到的CID_A匹配的RO，并将匹配的RO2的标识信息、RO3的标识信息，以及RO2和RO3的状态信息携带在许可检索响应消息中返回给DRM代理。Step 401 to Step 402: The SRM agent searches for the RO that matches the received CID_A among the ROs stored by itself, and carries the matching identification information of RO2, RO3, and status information of RO2 and RO3 in the license retrieval Returned to the DRM agent in the response message.

从本步骤可以看出，许可信息提供设备仅仅是将匹配的许可信息中的部分信息，比如RO的标识信息及其状态信息返回给许可信息请求设备，与现有返回的RO及其状态信息的完整信息相比，降低了信息的冗余，减小了消息的长度，即降低了交互消息中信息冗余。It can be seen from this step that the license information providing device only returns part of the matching license information, such as the identification information of the RO and its status information, to the license information requesting device, which is different from the existing returned RO and its status information. Compared with complete information, the redundancy of information is reduced, and the length of the message is reduced, that is, the redundancy of information in the interactive message is reduced.

步骤403：DRM代理从当前拥有的与CID_A对应的许可中选择一个许可。Step 403: The DRM agent selects a license from currently owned licenses corresponding to CID_A.

假设DRM中预先设置的选择策略是，选择即将过期的RO，因为RO2的有效期即将到期，因此DRM代理选择消费RO2。Assume that the preset selection strategy in the DRM is to select the RO that is about to expire, because the validity period of RO2 is about to expire, so the DRM agent chooses to consume RO2.

步骤404：DRM代理向SRM代理请求消费选定的RO2。Step 404: The DRM agent requests the SRM agent to consume the selected RO2.

步骤405：SRM代理收到来自DRM代理的消费RO2请求，假设允许消费RO2，则锁定自身存储的RO2。Step 405: The SRM agent receives the RO2 consumption request from the DRM agent, and if RO2 consumption is allowed, the SRM agent locks the RO2 stored by itself.

步骤406：SRM代理向DRM代理发送锁定确认消息。Step 406: the SRM agent sends a locking confirmation message to the DRM agent.

如果SRM代理是允许锁定RO2，则锁定确认消息中携带有锁定成功信息，以及RO2或RO2当前的状态信息；如果SRM代理是不允许锁定RO2，则锁定确认消息中携带有锁定失败信息。If the SRM agent is allowed to lock RO2, the lock confirmation message carries lock success information and RO2 or RO2 current status information; if the SRM agent does not allow locking RO2, the lock confirmation message carries lock failure information.

步骤407：DRM代理收到SRM代理的携带有锁定成功信息的锁定确认消息后，便可通过SRM消费RO2中的权限了，即可以播放电影A。Step 407: After the DRM agent receives the locking confirmation message carrying the locking success information from the SRM agent, the DRM agent can consume the rights in RO2 through the SRM, that is, the movie A can be played.

步骤408：在DRM代理消费RO2的权限的过程中，或者在停止消费RO2中的权限后，DRM代理会将RO2当前的状态信息携带在更新状态请求消息中发送给SRM代理，以保证SRM维护RO2当前的状态信息。Step 408: During the process of consuming the rights of RO2 by the DRM agent, or after stopping the consumption of rights in RO2, the DRM agent will carry the current state information of RO2 in the update status request message and send it to the SRM agent to ensure that the SRM maintains RO2 Current status information.

步骤409～步骤410：SRM代理根据接收到的状态信息更新自身存储的RO2的状态信息，并向DRM代理返回更新确认。Steps 409 to 410: The SRM agent updates the state information of RO2 stored by itself according to the received state information, and returns an update confirmation to the DRM agent.

需要说明的是，与实施例一类似，若步骤406中，DRM代理收到来自SRM代理的锁定确认中携带的是锁定失败信息，那么，DRM代理可按照步骤404的方式向SRM代理请求消费RO3中的权限；如果步骤406中，DRM代理收到来自SRM代理的锁定确认中携带的是锁定成功信息，那么，DRM可以删除自身暂时不使用的RO3。It should be noted that, similar to Embodiment 1, if in step 406, the lock confirmation from the SRM agent received by the DRM agent carries lock failure information, then the DRM agent may request the SRM agent to consume RO3 in the manner of step 404 In step 406, if in step 406, the lock confirmation from the SRM agent carried by the DRM agent is lock success information, then the DRM can delete the RO3 that it does not use temporarily.

从实施例以和实施例二的方法来看，对内容对应的许可的选择是由DRM代理来完成的，本发明也可以采用SRM代理先对内容对应的许可进行选择，然后将选定的许可返回给DRM代理。下面结合实施例进行具体描述。From the perspective of the embodiment and the method of embodiment two, the selection of the license corresponding to the content is completed by the DRM agent, and the present invention can also use the SRM agent to first select the license corresponding to the content, and then use the selected license Return to DRM agent. The following is a specific description in conjunction with the embodiments.

图5是本发明实施例三的流程图，如图5所示，本实施例三包括以下步骤：Fig. 5 is a flow chart of the third embodiment of the present invention. As shown in Fig. 5, the third embodiment includes the following steps:

步骤500：DRM代理向SRM代理发送许可检索请求，该许可检索请求中携带有DRM代理需要使用的内容即电影A对应的内容标识(CID_A)、选择标识和选择条件。Step 500: The DRM agent sends a license retrieval request to the SRM agent, and the license retrieval request carries the content to be used by the DRM agent, that is, the content identifier (CID_A) corresponding to movie A, selection identifier and selection condition.

本步骤中，选择标识用于表示是否需要SRM代理对CID_A对应的RO进行选择，比如该标识的取值为0表示不需要，为1表示需要进行选择，本实施例中假设选择标识为1。In this step, the selection flag is used to indicate whether the SRM agent needs to select the RO corresponding to CID_A. For example, if the value of the flag is 0, it means that it is not needed, and if it is 1, it means that it needs to be selected. In this embodiment, it is assumed that the selection flag is 1.

另外，也可以在SRM代理中配置是否进行自动选择的选择标识，比如设置选择标识为进行自动选择，则SRM代理在收到许可检索请求后，在检索RO后，许可信息提供设备按照自身预先设置的选择策略对检索出的RO进行选择。In addition, it is also possible to configure the selection flag of whether to perform automatic selection in the SRM agent. For example, if the selection flag is set to perform automatic selection, after the SRM agent receives the license retrieval request and retrieves the RO, the license information providing device will set it according to its own preset The selection strategy of is used to select the retrieved ROs.

之外，还可以是DRM代理将表示是否要求许可信息提供设备进行选择的选择标识发送给SRM代理，若所述选择标识显示要求进行选择，那么，SRM代理在收到许可检索请求后，按照自身预先设置的选择策略，在检索RO后对检索出的RO进行选择。此外，DRM代理还可以将选择条件发送给SRM代理，要求SRM代理从符合条件的许可中进行选择后，再按照自身预先设置的选择策略，在检索RO后对检索出的RO进行选择。In addition, it may also be that the DRM agent sends the selection identifier indicating whether to require the license information providing device to select to the SRM agent, and if the selection identifier indicates that a selection is required, then the SRM agent, after receiving the license retrieval request, according to its own The preset selection strategy selects the retrieved ROs after the ROs are retrieved. In addition, the DRM agent can also send the selection conditions to the SRM agent, requiring the SRM agent to select from qualified licenses, and then select the retrieved ROs after retrieving the ROs according to its preset selection strategy.

这里，选择条件可以是要求返回具有某种权限如MOVE权限，和/或返回的RO的最大数量等。选择条件的设置取决于实际需要，这里并不用于限定本发明。Here, the selection condition may be that the return has a certain authority, such as the MOVE authority, and/or the maximum number of returned ROs. The setting of selection conditions depends on actual needs, and is not used to limit the present invention.

步骤501～步骤502：SRM代理在自身存储的RO中，查找与接收到的CID A匹配的RO，并按照接收到的选择条件，在匹配的所有RO中选择满足选择条件的RO，并将选定的RO及其状态信息携带在许可检索响应消息中返回给DRM代理。Steps 501 to 502: The SRM agent searches for ROs that match the received CIDA in its own stored ROs, and according to the received selection conditions, selects the RO that satisfies the selection conditions from all matched ROs, and selects The specified RO and its state information are carried in the license retrieval response message and returned to the DRM agent.

本步骤中，假设DRM代理发送给SRM代理的选择条件是，选择具有MOVE权限且即将过期的RO，因为RO2当前具有MOVE权限，其有效期即将到期，因此SRM代理选择将RO2返给DRM代理。In this step, it is assumed that the selection condition sent by the DRM agent to the SRM agent is to select an RO that has MOVE authority and is about to expire, because RO2 currently has the MOVE authority and its validity period is about to expire, so the SRM agent chooses to return RO2 to the DRM agent.

RO2的状态信息包括：有效期为还有2天到期、MOVE权限、播放权限、当前允许播放次数5次。The status information of RO2 includes: the validity period is 2 days before expiration, MOVE permission, playback permission, and the current allowed playback times are 5 times.

步骤503：DRM代理从当前拥有的与CID_A对应的RO中选择RO。Step 503: The DRM agent selects an RO from currently owned ROs corresponding to CID_A.

本实施例中，假设DRM代理中存储有一个对应电影A的RO1，且RO1为无限期但有播放次数限制的RO，那么，本步骤中，DRM代理在RO1和RO2中进一步选择。由于RO2有效期即将到期，因此DRM代理选择将RO2转移到本地后消费。In this embodiment, assuming that there is an RO1 corresponding to movie A stored in the DRM agent, and RO1 is an RO with an indefinite period of time but with a limited play times, then, in this step, the DRM agent further selects between RO1 and RO2. Since the validity period of RO2 is about to expire, the DRM agent chooses to transfer RO2 to the local area for consumption.

步骤504：DRM代理向SRM代理请求转移选定的RO2。Step 504: The DRM agent requests the SRM agent to transfer the selected RO2.

步骤505：SRM代理收到来自DRM代理的转移RO2请求，假设允许将RO2转移给DRM代理，则删除自身存储的RO2。Step 505: The SRM agent receives the RO2 transfer request from the DRM agent, and if RO2 is allowed to be transferred to the DRM agent, deletes the RO2 stored by itself.

步骤506：SRM代理向DRM代理发送转移确认消息。Step 506: the SRM agent sends a transfer confirmation message to the DRM agent.

步骤507：DRM代理收到SRM代理的转移成功确认消息后，将RO2安装在本地。Step 507: The DRM agent installs RO2 locally after receiving the transfer success confirmation message from the SRM agent.

本实施例中，假设步骤501～步骤502中，SRM代理还选择了RO3，则该方法还可以进一步包括步骤508，如下：In this embodiment, assuming that in steps 501 to 502, the SRM agent also selects RO3, the method may further include step 508, as follows:

步骤508：DRM代理将从SRM代理接收到的暂时不使用的RO3删除。Step 508: The DRM agent deletes the temporarily unused RO3 received from the SRM agent.

实施例三与图3所示的实施例一之间的不同点在于，实施例一中，SRM代理将对应CID_A的所有RO发送给DRM代理，由DRM代理统一进行选择，而实施例三则是在SRM，先对与CID_A对应的RO进行选择，再将符合选择条件及选择策略的RO返回给DRM代理。The difference between Embodiment 3 and Embodiment 1 shown in FIG. 3 is that in Embodiment 1, the SRM agent sends all ROs corresponding to CID_A to the DRM agent, and the DRM agent makes a unified selection, while in Embodiment 3 it is In SRM, first select the RO corresponding to CID_A, and then return the RO that meets the selection conditions and selection strategy to the DRM agent.

上述实施例一至实施例三均是通过内容标识，向DRM代理请求对应的许可的，为了能够兼容现有通过RO的标识请求RO的方法，本发明还提供了SRM获取RID的方法，以改进并完善现有OMA SRM标准草案提供的图1所示的流程。The above-mentioned embodiments 1 to 3 all request the corresponding license from the DRM agent through the content identification. In order to be compatible with the existing method of requesting the RO through the identification of the RO, the present invention also provides a method for the SRM to obtain the RID, so as to improve and Improve the process shown in Figure 1 provided by the existing OMA SRM standard draft.

图6是本发明实施例四的流程图，如图6所示，包括以下步骤：Fig. 6 is a flow chart of Embodiment 4 of the present invention, as shown in Fig. 6, including the following steps:

步骤600：DRM代理在获取需要使用的内容对应的内容标识后，向SRM代理发送携带有该内容标识的许可检索请求。Step 600: After the DRM agent acquires the content identifier corresponding to the content to be used, it sends a license retrieval request carrying the content identifier to the SRM agent.

步骤601：SRM代理将存于SRM中的对应于该内容标识的许可证的标识信息，携带在许可检索响应中返回给SRM代理。Step 601: The SRM agent returns the identification information of the license corresponding to the content ID stored in the SRM to the SRM agent in a license retrieval response.

可选的，本步骤中，SRM代理还可以同时向DRM代理返回与CID对应的各许可证中各许可的状态信息。Optionally, in this step, the SRM agent may also return the status information of each license in each license corresponding to the CID to the DRM agent at the same time.

步骤602：DRM代理将接收到的许可证的标识信息，携带在许可索取响应中发送给SRM代理。Step 602: The DRM agent carries the received license identification information in the license request response and sends it to the SRM agent.

如果步骤601中返回与CID对应的各许可证中各许可的状态信息，则本步骤中，DRM代理可按照预先设置的选择策略或通过用户选择，选择一个或一个以上的许可证，再将选定的许可证的标识信息，携带在许可索取响应中发送给SRM代理。If the status information of each license in each license corresponding to the CID is returned in step 601, then in this step, the DRM agent can select one or more licenses according to a preset selection policy or by user selection, and then select The identification information of the specified license is carried in the license request response and sent to the SRM agent.

步骤603：SRM代理将与接收到的许可证的标识信息对应的许可信息携带在许可索取响应中返回给DRM代理。Step 603: The SRM agent returns the license information corresponding to the received license identification information in the license request response to the DRM agent.

步骤604：DRM代理从自身当前拥有的与内容标识对应的许可中按照预先设置的选择策略或是提醒用户选择一个许可。Step 604: The DRM agent selects a license according to a preset selection strategy or reminds the user from the licenses corresponding to the content identifier currently owned by itself.

步骤605：DRM代理对所选定的许可进行相应操作。Step 605: The DRM agent performs corresponding operations on the selected license.

同样，对内容标识对应的许可的选择也可以在SRM代理中实现，这里不再重述。Similarly, the selection of the license corresponding to the content identifier can also be implemented in the SRM agent, which will not be repeated here.

从上述本发明获取内容许可信息的方法可以看出，本发明通过内容标识从许可存储设备中获取与该内容标识对应的许可信息，减少了原有方案中索取许可的消息交互次数，减少了设备负担，提高了处理效率及用户体验。It can be seen from the above-mentioned method of obtaining content license information in the present invention that the present invention obtains the license information corresponding to the content ID from the license storage device through the content ID, which reduces the number of message interactions for requesting licenses in the original solution and reduces the number of devices. burden, improving processing efficiency and user experience.

而且，保证了许可请求设备在内容标识对应的所有许可中进行选择，防止了遗漏选择的风险，达到了最优选择的目的。Moreover, it is ensured that the license requesting device selects from all the licenses corresponding to the content identifier, avoiding the risk of missing selection, and achieving the purpose of optimal selection.

之外，本发明通过内容标识获取了许可证对应的标识，改进了现有获取内容许可信息的方案。In addition, the present invention obtains the identification corresponding to the license through the content identification, which improves the existing solution for obtaining content license information.

针对上述本发明方法，本发明还提供一种获取内容许可信息的系统，该系统包括许可信息请求设备和许可信息提供设备。With respect to the above method of the present invention, the present invention also provides a system for obtaining content license information, the system includes a license information requesting device and a license information providing device.

其中，许可信息请求设备，用于向许可信息提供设备发送携带有许可信息请求设备需要使用的内容对应的CID的许可信息检索请求，接收来自许可设备的许可信息，并从自身当前拥有的许可信息中选择一个许可信息，对所选定的许可信息进行相应操作。Wherein, the license information requesting device is configured to send a license information retrieval request carrying a CID corresponding to the content to be used by the license information requesting device to the license information providing device, receive the license information from the licensing device, and obtain the license information from the license information it currently owns. Select a license information in , and perform corresponding operations on the selected license information.

许可信息提供设备，用于接收来自许可信息请求设备的许可信息检索请求，向许可信息请求设备返回与接收到的CID匹配的许可信息。许可响应设备为一个或一个以上。The license information providing device is configured to receive the license information retrieval request from the license information requesting device, and return the license information matching the received CID to the license information requesting device. There are one or more license response devices.

以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围，凡在本发明的精神和原则之内所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall include Within the protection scope of the present invention.