WO2008034379A1 - Method, system and device for replacing copyright object in digital copyright management system - Google Patents

Abstract

A method and system for exchanging version object in digital version managing system are provided to solve the problem of that the prior art of DRM can not complete exchanging version object in one interactive process. The method comprises: the digital version management proxy module of client sends one version exchange request message carrying at least one original version object information and at least one target version object information to the version center, the version center, based on received version exchange request message, decides to exchange version objects and generates version exchange response message, the version center sends version exchange response message to the digit version management proxy module, the digit version management proxy module, based on received version exchange response message, replaces the original version object, or keeps the original version object.

Description

 Method, system and device for retrieving version M" in digital rights management system

 The present invention relates to the field of digital network communications, and in particular, to a digital rights management technology. Background of the invention

 DRM (Digital Rights Management) is a technology that appears in network communication to prevent illegal use of digital content. Content providers and operators can manage the use of downloaded content by users through DRM technology, effectively preventing piracy and protecting the rights of content providers/developers. At present, a lot of research work has been carried out internationally for DRM. Among them, the mobile DRM standard developed by OM A (Open Mobile Alliance) has been widely supported and recognized.

 The OMA DRM system includes a Content Issuer (CI), a Rights Issuer (RI), and a DRM Agent Module (DRM Agent). The CI is responsible for sending the encrypted digital content product DCF (DRM Content Format) to the user, and the user downloads the DCF to the DRM Agent on the terminal device. If the user wants to use the downloaded digital content, the DCF's Rights Object (RO) must be requested from the RI. The RO includes the key of the decrypted DCF and the rights management information of the digital information, such as the number of uses, the duration of use, and the like. After the RO completes the authentication and registration process between the terminal and the RI, it is transmitted to the terminal by the RI.

 At the same time, the need for users to exchange for RO has become a common problem. The user exchanges RO for a change of the original RO or multiple original ROs in exchange for one target RO or multiple target ROs, one original RO or multiple original ROs in exchange for one or more of the original ROs. .

The current solution to RO in DRM technology is divided into two processes, first withdrawal Sell the original RO and re-request the new target RO.

 The revocation process includes: Step 1: The client sends a copyright revocation message to the RI. Step 2: After receiving the revocation message, the RI updates the revocation record of the RO and sends a RO revocation report to the client if the user agrees to cancel the revocation report; Step 3, the client The local original copyright is deleted after receiving the revocation report.

 The request process includes: Step 1: The client sends an RO request message to the RI to request the required target copyright; Step 2, after the RI authenticates the DRM Agent of the client, sends a response message; Step 3: The client receives the response according to the response The message installs the target RO.

 The existing DRM technology has the following problems: It takes at least two interaction processes to exchange copyright objects, and it is not possible to exchange copyright objects in one interaction. Summary of the invention

 In order to solve the technical problem that the existing DRM technology cannot complete the exchange of the rights object in an interaction process, the method, system and device for retrieving the rights object in the digital rights management system are provided in one or more embodiments of the present invention. The exchange of copyright objects is completed during an interaction.

 In order to solve the above technical problem, the present invention adopts the following technical solutions:

 A method for retrieving a copyright object in a digital rights management system, comprising: receiving, by a digital rights management agent module of a client, a copyright exchange request message carrying at least one original rights object information and at least one target rights object information; The copyright exchange request message determines whether a rights object exchange is performed, and generates a copyright exchange response message; and sends the copyright exchange response message to the client, notifying the client's digital rights management agent module to replace the original rights object, or retaining the original rights object.

A method for retrieving a copyright object in a digital rights management system, comprising: submitting at least one original copyright object information and at least one target rights object information to a copyright center a copyright exchange request message; receiving a copyright exchange response message from the copyright center; replacing the original rights object or retaining the original rights object according to the received copyright exchange response message.

 A digital copyright management system, comprising: a copyright center, determining whether to perform a copyright exchange according to the received copyright exchange request message, and transmitting the processing result in the form of a copyright exchange response message; the digital rights management agent module is disposed at the client And transmitting the copyright exchange exchange request, and receiving the copyright exchange response message; replacing the original copyright object according to the received copyright exchange response message, or retaining the original copyright object.

 A copyright center, comprising a first copyright exchange message receiving unit, configured to receive a copyright exchange request message sent by a client and carrying at least one original rights object information and at least one target rights object information, and the copyright exchange request message is received Sending to the first copyright exchange processing unit; the first copyright exchange processing unit determines whether to perform the copyright exchange according to the copyright exchange request message received by the first copyright message receiving unit, and sends the processing result to the first in the form of a copyright exchange response message a copyright exchange message sending unit; a first copyright exchange message sending unit, configured to send the copyright exchange response message to the client.

 A digital rights management agent module of a client, comprising: a second copyright exchange message sending unit, a second copyright exchange processing unit, and a second copyright exchange message receiving unit; and a second copyright exchange message sending unit is configured to send a copyright exchange to the copyright center The request message; the response message is forwarded to the second copyright exchange message receiving unit; and the second copyright exchange processing unit replaces the original rights object with the target rights object or retains the original rights object according to the copyright exchange response message.

In the embodiment of the present invention, the copyright exchange request message sent by the digital rights management agent module of the client to the copyright center includes the original copyright object information, and the target copyright object information to be exchanged indicates that the target copyright needs to be exchanged; the copyright center requests according to the copyright exchange. The message judges whether the condition of the exchange is met, if it meets, it provides a new target copyright object, and updates the local a database, the target copyright object is sent to the digital rights management agent module with a copyright exchange response message carrying the status information of the exchange success; the digital rights proxy module of the client replaces the local original with the new target rights object according to the received response message The rights object or the permission item in the original rights object is changed with the replacement target permission item. The exchange of the entire copyright object is completed in an interaction process, without the need to revoke the original copyright object as in the prior art, and then request a new target copyright object, after two interaction processes, thereby overcoming the existing DRM technology. The technical problem of retrieving the target copyright in an interaction process. Moreover, only one interaction process is needed, the process is simplified, the network burden is reduced, and the degree of freedom of user selection is increased, and the user can flexibly exchange for the copyright object, and there is no phenomenon that only the re-request is not re-requested, and the problem is overcome. The problem of wasting resources. BRIEF DESCRIPTION OF THE DRAWINGS

 1 is a block diagram showing the structure of a digital copyright management system of the present invention;

 2 is a schematic structural diagram of a copyright center in the digital rights management system shown in FIG. 1; FIG. 3 is a schematic diagram showing a structure of a digital rights management agent module in the digital rights management system shown in FIG.

 4 is a flow chart showing a first embodiment of a method for retrieving a copyright object in a digital rights management system of the present invention;

 Figure 5 is a flow chart showing a second embodiment of a method for retrieving a rights object in a digital rights management system of the present invention;

 6 is a flowchart of processing a original copyright object by a digital rights management agent module in a method for exchanging rights objects in a digital rights management system shown in FIG. 4 or FIG. 5;

 Figure 7 is a schematic diagram of an interface between a user and a portal;

 Figure 8 is a schematic diagram of Aimed RO Info List parameter values;

Figure 9 is a schematic diagram of the value of the Trade RO Info List parameter parsed by the DRM agent. Mode for carrying out the invention

 The technical solution of the present invention will be further explained below with reference to the accompanying drawings.

 Referring to Figure 1, a digital rights management system of the present invention is illustrated. The DRM system includes a content center 101, a copyright center 102, and a DRM agent module 104 in the client 103.

 Referring to FIG. 2, the copyright center 102 further includes a first copyright exchange message receiving unit 201, a first copyright exchange message transmitting unit 202, a first copyright exchange processing unit 203, and an index creating unit 204.

 Referring to FIG. 3, the DRM agent module 104 further includes: a second copyright exchange message receiving unit 301, a second copyright exchange message transmitting unit 302, and a second copyright exchange processing unit 303.

 The second copyright exchange message sending unit 302 sends a copyright exchange request message to the first copyright exchange message receiving unit 201, and the first copyright exchange processing unit 203 determines whether to proceed according to the copyright exchange request message received by the first copyright message receiving unit 201. The copyright exchange, and the processing result is sent to the second copyright exchange message receiving unit 301 through the first copyright exchange message transmitting unit 202 in the form of a copyright exchange response message, and the second copyright exchange processing unit 303 according to the second copyright exchange message receiving unit 301 The received copyright exchange response message replaces the original copyright object with the target rights object or retains the original rights object.

 The index creation unit 204 is configured to create an exchange index information group (specifically, an exchange index table) to store the processing result and the exchange identifier processed by the first copyright exchange unit. And the first copyright exchange message sending unit 202 is further configured to send, according to the exchange index information group, a trigger message carrying the exchange identifier to the second copyright exchange message receiving unit 301, where the second copyright exchange message sending unit 302 further uses The copyright acquisition message carrying the exchange identifier is transmitted to the first copyright exchange message receiving unit 201.

 Referring to FIG. 4, a flow chart of a first embodiment of a method for retrieving a rights object in a digital rights management system of the present invention is illustrated.

Step S401, the DRM agent module of the client sends a RO Trade Request to the RI. The right to exchange a request message, requesting to exchange the RO of another media content or change the RO of the existing media content. Refer to Table 1, the parameters included in the message: Device ID (client device label), RI ID (copyright center ID) that issued the original copyright, Device nonce (client device temporary), Request Time (client DRM current time) ), Original RO Info List, Aimed RO Info List, Certificate chain, Extensions, and Signature (Signature of DRM client to local messages) ).

 RO Trade Request message parameters

 Parameter Required (M)/Optional (0) Description

 Device ID M identifies the requested client device

 ROD M identifies the RI that issued the original copyright

 Device nonce M device selected nonce, preventing replay attacks

Request Time M DMM current time measured by the device

 Original RO Info List M identifies a list of original rights object information, including one or more Original RO Info

 Aimed RO Info List M identifies a list of target rights object information, including one or more Aimed RO Info

 Certificate chain 0 Certificate chain required to verify device signature

 Extensions 0 message extension, see OMA DRM2.0 TS specification

Signature M device signature of RO Trade Request message Table 2 Original RO Info parameters

 Parameter Required (M)/Optional (0) Description

 RO ID O Original RO ID, an Original RO Info, including RO ID, does not include Protected Original RO

Protected Original RO 0 Encrypted complete original RO, one Original RO Info, including Protected

 Original RO, does not include RO ID

 Rights State 0 The remaining copyright status information of the original copyright, ie

 The current state of the original RO permission of the DRM Agent. Original RO Info must include this parameter when the original RO is stateful. This parameter is used with RO ID or Protected Original RO. Original RO Info List includes at least one Original RO Info (original copyright object information) to satisfy the user. At least one original RO is exchanged for a target RO requirement. Referring to Table 2, Original RO Info includes the original RO ID (original copyright object identifier) or Protected Original RO (encrypted original RO). If the RO is in a state, the DRM agent module is required to submit the remaining copyright status information of the original RO ( State ), for example: Allow 5 ROs to be used, and 2 usage rights are left when the user changes.

 The Aimed RO Info List includes at least one Aimed RO Info to satisfy the user to exchange more than one target RO at the same time. Referring to Table 3, Aimed RO Info includes Selected RO (target RO information selected by the user) or Aimed Rights (for the same media content, change the target permission items in the original RO, such as: change a time period, etc.). If the original RO is exchanged for a target RO, the Aimed RO Info also includes the Original RO ID (all original RO IDs that are in exchange for the target RO).

 Aimed RO Info parameters

 Parameter Required (M)/Optional Description

 (0)

 Selected RO 0 Target RO information selected, including target

RO ID. In an Aimed RO Info, including Selected RO does not include Aimed Rights

Aimed Rights 0 changes the target permission item information in the original RO for the same media content, including the original RO ID that was changed, and Aimed RO Info, including Aimed Rights, does not include Selected RO

 Original RO 0 is the ID ID of the original RO that is in exchange for the target RO. In an Aimed RO Info, this parameter can be multiple, satisfying the requirement of multiple original ROs in exchange for a target RO. This parameter must be associated with Selected RO or In the Aimed Rights step S402, the copyright center determines whether to perform the rights object exchange according to the received RO Trade Request message.

 Among them, the simplest judgment conditions can include:

 The RI verifies the identity of the client and the legality and correctness of the original RO related information. The original RO related information includes whether the owner of the original RO is the client submitting the exchange request, or the holder of the client; whether the remaining copyright of the original RO is Consistent with the Rights State parameter in the exchange request (this parameter is included in Original RO Info). If the verification is passed, the copyright exchange request is accepted, otherwise the copyright exchange is rejected.

Further, the determining condition may further include: determining whether to agree to the copyright exchange transaction, and calculating the difference in exchange for the RO. A configuration file can be set on the RI server side, and the following parameters are saved: When the difference is greater than Max_Dfr, the RO is not allowed to be replaced. According to this rule, RI judges whether or not to agree to the copyright exchange transaction. In addition, the calculation of the RO spread can refer to the relevant business strategies and regulations of the operator/content provider. Further, the determining condition may further include: the RI providing the target rights object, and updating the local RO database. If the Aimed RO Info in the RO Trade Request message submits the Selected RO that the user has previously selected, the RI extracts the RO from the database. If Aimed RO Info submits the user's copyright change right to the original RO, namely Aimed Rights, RI generates a target RO or target permission item based on the Aimed Rights and updates the local database. If the target rights object is provided or the local RO database is updated, the copyright exchange is rejected.

 If the copyright exchange request is accepted through the above judgment, the RI creates a copyright exchange response message in which the status information is exchanged successfully. Otherwise, a status information is created for the exchange of the failed copyright exchange response message, which may further include the reason why the RO exchange failed.

Step S403, the RI sends a RO Trade Response message carrying the status information to the DRM agent module. Refer to Table 4, the parameters included in the message: Status, Device ID, RI ID of the issued target copyright, Device nonce, Trade RO Info List, Certificate chain, OCSP Response ), Extensions, and Signature ₀

 RO Trade Response message parameters

 Required (M) / Optional (0)

 Parameter Status=Success Status^Success Description

 Status M M processes the status report of the RO Request message

Device ID M client device ID, same as the Device ID in the RO Trade Request message RI ID M identifies the issuing target

 RO RI

 Device nonce M device selected nonce to prevent replay attacks. This value must be the same as Device nonce in the RO Trade Request message.

 Trade RO Info M In exchange for the target of the exchange List copyright list, including one or more Trade RO Info

 Certificate 0 Verify the certificate chain required by the device signature chain

 OCSP 0 indicates whether the certificate chain is

Response is valid

 Extensions 0 message extension, see

 OMA DRM2.0 TS specification

 Signature M RI on RO Trade

The signature of the Response message, in the Trade RO Info List, includes at least one Trade RO Info to meet the user's requirement to exchange more than one target RO at the same time. Reference table 5, The Trade RO Info includes the encrypted target RO ( Protected Aimed RO) that the user wants or the encrypted replacement target item (Replace Item) generated by Aimed Rights. If the 'Original RO ID' is included in the Aimed RO Info parameter in the RO Trade Request message, the 'Original RO ID' must also be included in the Trade RO Info, and the two are identical, or the latter includes all IDs in the former.

 Trade RO Info parameters

 Parameter Required (M)/Optional Description

 (0)

 Protected Aimed 0 Encrypted full target RO, a Trade RO RO Info including Protected Aimed

 RO, does not include Replace Item

Replace Item 0 Encrypted replacement target permission item, including new RO ID, and replacement original RO ID, including Replace Item in a Trade RO Info, excluding Protected Aimed RO

 Original RO ID 0 is the original that was handed in in exchange for the target RO

The ID of the RO. If the Original RO ID is included in the Aimed RO Info in the RO Trade Request message, this parameter must also be included in the 'J Trade RO Info, and the Original RO ID includes the Original RO ID in the Aimed RO Info, or The Original RO ID is the same as the Original RO ID in Aimed RO Info. Step S404, the RO Trade Response message received by the DRM agent module, processing the original copyright object, and the processing procedure thereof is as shown in FIG.

 In step S601, the DRM agent module detects the status information Status, and if Status is successful, S602 is performed, otherwise, S605 is performed.

 In step S602, the DRM agent module detects Trade RO Info in the RO Trade Response, and if the parameter included in the Trade RO Info is Protected Aimed RO, step S603 is performed; if the parameter included in the Trade RO Info is Replace Item Then, step S604 is performed.

 In step S603, the DRM agent module installs Protected Aimed RO, and deletes all the original copyright objects according to the Original RO ID, and ends.

 In step S604, the DRM agent module replaces the permission item in the corresponding original copyright object with the permission information in the Replace Item according to the original RO ID in the Replace Item. And replace the original RO ID with the new target RO ID in the Replace Item. If Trade RO Info also includes the parameter Original RO ID, the DRM Agent module also deletes all other original rights objects corresponding to these IDs, and ends.

 In step S605, the DRM agent module retains the original rights object and ends.

 Referring to Figure 5, a flow chart of a second embodiment of the present invention is illustrated.

 In step S501, the DRM agent module of the client sends a RO Trade Request message to the RI, requesting to exchange the RO of another media content or changing the RO of the existing media content.

Step S502: After receiving the foregoing RO Trade Request message, the RI allocates a Trade ID (Exchange ID) to the exchange, and creates an exchange index information group that records the correspondence between the current exchange identifier and the processing result. Specifically, the exchange index information group may be an exchange index table with the Trade ID as shown in Table 6, and sent to the DRM agent module to carry the Trade ID Trigger message.

 The Trigger message can also carry a parameter indicating the time, which is used to instruct the client to request the copyright object at a later time.

 Table 6 Exchange index table maintained by RI

步骤 S503 ,版权中心根据接收到的 RO Trade Request消息判断是否 进行版权对象交换， 其判断条件与第一个具体实施例的步骤 S402 中的 判断条件相同， 并将处理产生的 RO Trade Response消息保存到交换索 引表中。

Step S503: The copyright center determines, according to the received RO Trade Request message, whether to perform the rights object exchange, the judgment condition is the same as the judgment condition in step S402 of the first embodiment, and saves the RO Trade Response message generated by the process to Exchange the index table.

 Step S504, the DRM agent module sends an RO Obtain message carrying the Trade ID to the RI.

 The DRM agent module can send the RO Obtain message at the time specified in the Trigger message.

 Step S505: The RI verification end extracts the RO Trade Response message from the exchange index table according to the Trade ID, and then sends the RO Trade Response message back to the client DRM agent module.

 Step S507: The DRM agent module processes the original rights object according to the received RO Trade Response message, and the processing procedure is the same as the process of step S404 of the first embodiment.

In this embodiment, the Trade ID in step S502 may be generated by the digital rights management agent module, and then step S502 includes: the copyright center checks the copyright exchange. Determining the uniqueness of the exchange identifier in the message, and creating an exchange index information group with the exchange identifier, and no longer sending a trigger message to the DRM agent module.

 In order to further understand the present invention, a third specific embodiment is proposed for a method for retrieving a copyright object in a digital copyright management system provided by the present invention.

A mobile user currently has 10 original ROs, denoted as RO^R0 ₂ , R0 ₃ , R0 ₄ , R0 ₅ , R0 ₆ , R0 ₇ , R0 ₈ , R0 ₉ , RO ₁₀ , whose identifiers are 1, 2, 3 , 4, 5, 6, 7, 8, 9, 10. The user wishes to exchange RC R0 ₂ , R0 ₃ , R0 ₄ , R0 ₅ , R0 ₆ , R0 ₇ , R0 ₈ for the target rights object RO ^a identified as ^a , and use R0 ₉ and RC. In exchange for the target copyright object RO ^b identified as b, where RO ^b is a change to the copyright item of R0 ₉ and the usage time is extended.

 The user first logs in to the RI Portal (portal) interface to fill in the information related to the RO, and submits the relevant information to the RI. Referring to FIG. 7, it is a schematic diagram of a user interaction interface with a portal, where the original information includes an original ROID, an original RI ID, and an original copyright state. And other information; in the target information, including selected Aimed RO and other options such as Aimed Rights Description for editing, the definition of the license operation and operation constraints can be found in OMA DRM2. .0 is defined in the TS specification. The user can select the required RO in the content center webpage, the RI Portal or the super distribution, or the RO of the different media content or the same media content, and the ID of the RO and the RI that issues the target RO. The ID is filled in to the interface. If the user only wants to make minor changes to the original RO, the target copyright object description item can be selected, and the permission information to be changed can be edited.

In this embodiment, the user first fills in the original copyright object identifiers 1, 2, 3, 4, 5, 6, 7, 8 in the "original information" column on the interface shown in FIG. "Select single option in the column" to select the target copyright object information, ,, and fill in the "target copyright object identifier, as a, complete the filling of a target copyright information.

 On the filling interface of the next target copyright information (as shown in Figure 7), the original copyright object identifiers 9, 10 are filled in the "Original Information" column. In the "Target Information" column, select the single option "Target Rights Object Description", fill in the "Original Rights Object ID," and enter the right of the user in the "Operation License" and "Operation Constraints" fields. Description of the item. For example, the "lifetime" of "play" is changed to "September 1 to September 10".

The Portal converts the content of the above interface into a RO Trade Request message and submits it to the RI process. Referring to FIG. 8, it is a schematic diagram of the Aimed RO Info List, including two Aimed RO Info, and one Aimed RO Info includes Selected RO, that is, the identifier is a. RO ^a , and the identifiers of the original rights objects RO R0 ₂ , R0 ₃ , R0 ₄ , R0 ₅ , R0 ₆ , R0 ₇ , R0 ₈ in exchange for the target RO 1, 2, 3, 4, 5, 6, 7, 8 , another Aimed RO Info includes Aimed Rights (for the same media content, change the license operation in the target permission item in R0 ₉ with the identifier 9 to form a new target copyright object RO ^b identified as b, the identifier b can be subsequently Assigned by RI ;), where Aimed Rights includes the changed rights object identifier 9 and the operation permission option. Aimed RO Info also includes the identifiers 9, 10 of the original copyright objects R0 ₉ and R0 _{1 ()} that are in exchange for the exchange of RO ^b .

 After processing the RO Trade Request message, the RI sends a RO Trade Response message to the client, and includes parameters such as: Status, Device ID, RI ID of the target copyright, Device nonce, Trade RO Info List, and the like. Certificate chain ^ OCSP Response ^ Extensions and Signature.

Wherein, Trade RO Info List, with reference to FIG. 9, is a schematic diagram Trade RO Info List, comprising two Trade RO Info, which comprises a Trade RO Info Protected Aimed RO, i.e., identified as a target of the encrypted rights object complete ^a the RO Another Trade RO Info includes Replace Item, which is an encrypted target permission item generated according to Aimed Rights, including: new copyright object identifier b, changed copyright object identifier 9 and permissions (usage period) From September 1st to September 10th, there are also the identifiers 9, 10 of the original copyright objects R0 ₉ and R0 _1Q in exchange for the target copyright object RO ^b .

The DRM agent module parses the Trade RO Info according to the received RO Trade Response message, wherein the first Trade RO Info includes Protected Aimed RO, which is an encrypted RO ^a , and the target of the DRM agent module installation identifier is a. The copyright object RO ^a , and delete the original copyright objects RC R0 ₂ , R0 ₃ , R0 ₄ , R0 ₅ , R0 ₆ , R0 ₇ , R0 ₈ corresponding to the identifiers 1, 2, 3, 4, 5, 6, 7, ₈ .

The second Trade RO Info includes Replace Item, and the DRM agent module replaces the permission item in R0 ₉ with the permission information in the Replace Item according to the copyright object identified by the Replaced RO ID. And the original object identifier 9 is replaced with the new target rights object identifier b, and the original copyright object RO with the identifier 10 of the RO ^b is deleted, and it is determined that R0 ₉ does not exist locally, otherwise the R0 _{9 is} deleted and ends.

 In all of the above embodiments, the message interaction in exchange for the rights object may be implemented by an HTTP (Hyper Text Transfer Protocol) or a ROAP (Effective Object Acquistion Protocol) protocol.

It can be seen from the above that in the method and system for retrieving a copyright object in a digital rights management system provided by the present invention, the copyright exchange request message sent by the digital rights management agent module of the client to the copyright center includes the original copyright object information, In exchange for the target copyright object information, indicating that the target copyright needs to be exchanged; the copyright center judges whether the eligible condition is met according to the copyright exchange request message, provides a new target copyright object if it is met, and updates the database, and exchanges the target copyright object with the target. The copyright exchange response message of the successful status information is sent to the digital rights management agent module; the digital rights proxy module of the client replaces the local original copyright object with the new target rights object or uses the target permission item to be replaced according to the received response message. Change the permission item in the original copyright object. The exchange of the entire copyright object is completed in one interaction process, without the need to revoke the original copyright object as in the prior art, and then To request a new target rights object, after two interaction processes, the technical problem that the existing DRM technology cannot complete the exchange of the target copyright in one interaction process is overcome. Moreover, the technical solution of the present invention only needs one interaction process, which simplifies the process, reduces the network burden, and increases the degree of freedom for the user to select the copyright, and the user can flexibly exchange the required copyright object, and does not appear to retreat only. The phenomenon of re-requesting, resources are no longer wasted.

 In the second specific embodiment of the present invention, the technical solution of the present invention first identifies the current exchange by using the Trade ID, and then the RI processes the RO Trade Request message, and saves the generated RO Trade Response message in the exchange index table, and waits until the user When the RI has been processed, the client sends the RO Obtain message to extract the RO Trade Response message in exchange for the copyright object. This not only solves the technical problem that the prior art cannot complete the exchange of the target copyright in an interaction process, but also the RI. The client is more flexible in handling copyright exchanges, making the system more optimized.

 The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings are also considered. It is the scope of protection of the present invention.

Claims

Claim A method for exchanging a copyright object in a digital rights management system, the method comprising:  Receiving, by the digital rights management agent module of the client, a copyright exchange request message carrying at least one original copyright object information and at least one target rights object information;  Determining whether to perform a copyright object exchange according to the received copyright exchange request message, and generating a copyright exchange response message;  The copyright exchange response message is sent to the client, and the digital rights management agent module of the client is notified to replace or retain the original copyright object.  2. The method of claim 1 wherein:  After receiving the copyright exchange request message and determining whether to perform the rights object exchange, the method further includes: the copyright center creates an exchange index information group with the current exchange identifier; after generating the copyright exchange response message, and sending the copyright exchange to the client The response message further includes: saving the generated copyright exchange response message into the exchange index information group; receiving a copyright acquisition message carrying the exchange identifier from the client; and exchanging index information according to the copyright acquisition message The corresponding copyright exchange response message is retrieved from the group.  3. The method according to claim 2, wherein the exchange identifier is generated by the digital rights management agent module of the client and carried in the copyright exchange request message;  The creating an exchange index information group with the current exchange identifier includes: the copyright center checking the uniqueness of the exchange identifier in the copyright exchange request message, and creating an exchange index information group with the exchange identifier .  4. The method of claim 2, wherein the exchange identifier is generated by a copyright center;  The creating an exchange index information group with the current exchange identifier includes: the copyright center creates an exchange index information group with the current exchange identifier, and sends the digital rights management agent module to carry the exchange identifier Trigger a message. The method according to claim 3 or 4, wherein the exchange index letter The interest group includes: exchange identifier, client identifier, and information save item.  The method according to claim 1 or 2, wherein the original copyright object information comprises: an original copyright object identifier or an encrypted original copyright object, the original copyright object being used for redeeming a target copyright object;  The target rights object information includes: the selected target rights object information or the target rights item, wherein the selected target rights object information is a complete target rights object or a target rights object identifier selected by the client, and the target rights item is Change the permission information for an original copyright object.  7. The method according to claim 6, wherein the original copyright object information further comprises: remaining copyright status information;  The target rights object information further includes: at least one original rights object identifier, the original rights object identifier being used to identify an original rights object that is exchanged for the target rights object.  8. The method of claim 6, wherein the target rights item comprises a changed original rights object identifier.  9. The method according to claim 1 or 2, wherein the determining whether to perform the rights object exchange comprises:  Verify the validity and correctness of the client identity and the information of the original copyright object. If the verification is successful, it is determined to exchange the rights object, otherwise the copyright exchange is rejected.  The method according to claim 9, wherein the determining further comprises: calculating a difference between the target copyright object and the original copyright object, and if the difference is greater than a preset exchange threshold of the copyright center, the copyright center rejects Copyright exchange.  The method according to claim 9, wherein the determining further comprises: providing a target rights object according to the target rights object information, and updating the local rights object database, if the target rights object is provided or the database is updated, the copyright center Reject the copyright exchange request.  The method according to claim 1 or 2, wherein the copyright exchange response message includes at least one exchange copyright object information. 13. The method of claim 12, wherein the exchange of rights objects The information includes: Encrypted full target rights object or encrypted replacement target rights item.  14. The method according to claim 13, wherein the replacement target authority item is generated according to a target authority item in the copyright exchange request message, and includes a target rights object identifier and an original rights object identifier of the changed authority.  The method according to claim 13, wherein the parameter for exchanging rights object information further comprises: at least one original rights object identifier.  16. The method according to claim 15, wherein the original rights object identifier comprises an original rights object identifier in the target rights object information, or the original rights object identifier and the original rights object in the target rights object information The logo is consistent.  17. A method for exchanging a rights object in a digital rights management system, the method comprising:  Submitting, to the copyright center, a copyright exchange request message carrying at least one original copyright object information and at least one target rights object information;  Receiving a copyright exchange response message from a copyright center;  The original copyright object is replaced or the original copyright object is retained in accordance with the received copyright exchange response message.  18. The method according to claim 17, wherein the replacing the original copyright object or retaining the original copyright object according to the received copyright exchange response message comprises:  The digital rights management agent module detects status information in the copyright exchange response message, and if the status information is successful, replaces the original rights object with the target rights object according to the copyright exchange response message; otherwise, the digital rights management agent The module retains the original copyright object.  19. The method of claim 18, wherein the digital rights management proxy module replaces the original rights object with the target rights object according to the copyright exchange response message, including: The digital rights management agent module detects the exchange rights object information in the copyright exchange response message, and if the exchange rights object information is an encrypted full target rights object, install the encrypted full target rights object, and delete all corresponding Original copyright object; The exchange rights object information is an encrypted replacement target rights item, and the rights item in the corresponding original rights object is automatically replaced according to the replacement target rights item, and the original rights object identifier is replaced with a new target rights object identifier. , and delete all original copyright objects that have been exchanged.  20. A digital rights management system, comprising:  The copyright center determines whether to perform copyright exchange according to the received copyright exchange request message, and sends the processing result in the form of a copyright exchange response message;  a digital rights management agent module, configured to send, by the client, the copyright exchange exchange request, and receive the copyright exchange response message; replace the original copyright object according to the received copyright exchange response message, or retain the original copyright Object.  The system according to claim 20, wherein the copyright center comprises: a first copyright exchange message receiving unit, configured to receive, by the client, at least one original copyright object information and at least one target rights object a copyright exchange request message of the information; a first copyright exchange processing unit, configured to determine, according to the copyright exchange request message, whether to perform a copyright exchange, and generate a copyright exchange response message according to the processing result; a first copyright exchange message sending unit, configured to The copyright exchange response message is sent to the client.  The system according to claim 21, wherein the digital rights management agent module comprises: a second copyright exchange message sending unit for transmitting a copyright exchange request message to the copyright center; and a second copyright exchange message receiving unit Receiving a copyright exchange response message returned by the copyright center; the second copyright exchange processing unit replaces the original copyright object with the target copyright object or retains the original copyright object according to the copyright exchange response message;  The second copyright exchange message sending unit is configured to send a copyright exchange request message to the first copyright exchange message receiving unit; the first copyright exchange processing unit determines whether to perform copyright according to the copyright exchange request message received by the first copyright message receiving unit. Exchanging, and transmitting the processing result in the form of a copyright exchange response message to the second copyright exchange message receiving unit through the first copyright exchange message sending unit; The second copyright exchange processing unit replaces the original copyright object with the target copyright object or retains the original copyright according to the copyright exchange response message received by the second copyright exchange message receiving unit Object.  The system according to claim 21 or 22, wherein the copyright center further comprises:  An index creation unit is configured to create an exchange index information group to store the processing result and the exchange identifier processed by the first copyright exchange processing unit.  The system according to claim 23, wherein the first copyright exchange message sending unit is further configured to send, according to the exchange index information group, a second copyright exchange message receiving unit that carries the exchange identifier Trigger message  The second copyright exchange message sending unit is further configured to send the copyright acquisition message carrying the exchange identifier to the first copyright exchange message receiving unit.  25. A copyright center, characterized in that the copyright center comprises:  a first copyright exchange message receiving unit, configured to receive, by the client, a copyright exchange request carrying the at least one original rights object information and the at least one target rights object information, and the first copyright exchange processing unit is configured to perform the copyright exchange request according to the The message determines whether a copyright exchange is performed, and generates a copyright exchange response message according to the processing result;  And a first copyright exchange message sending unit, configured to send the copyright exchange response message to the client.  The copyright center according to claim 25, the copyright center further comprising: an index creation unit, configured to allocate an exchange identifier for the exchange or determine the uniqueness of the exchange identifier sent by the digital rights management agent module; An exchange index information group is created to store the exchange identifier and the processing result processed by the first copyright exchange processing unit.  The copyright center according to claim 26, wherein the first copyright exchange message sending unit is further configured to send, according to the exchange index information group, a trigger message carrying the exchange identifier;  The first copyright exchange message receiving unit is further configured to receive a copyright acquisition message carrying the exchange identifier. 28. A client-side digital rights management agent module, characterized in that digital rights are The management agent module includes:  The second copyright exchange message sending unit is configured to send a copyright exchange request to the copyright center,  The second copyright exchange message receiving unit is configured to receive a copyright exchange response message returned by the copyright center;  The second copyright exchange processing unit replaces the original copyright object with the target copyright object or retains the original copyright object in accordance with the copyright exchange response message.