CN101355569A - Control method, apparatus and system for downloading digital content - Google Patents
Control method, apparatus and system for downloading digital content Download PDFInfo
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- CN101355569A CN101355569A CNA2008102221592A CN200810222159A CN101355569A CN 101355569 A CN101355569 A CN 101355569A CN A2008102221592 A CNA2008102221592 A CN A2008102221592A CN 200810222159 A CN200810222159 A CN 200810222159A CN 101355569 A CN101355569 A CN 101355569A
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Abstract
The invention discloses a method, a device and a system for controlling the downloading of a digital content and for controlling the number of clients downloading the digital content so as to avoid that the digital content is unloaded at will by a large number of clients. The method for controlling the downloading of the digital content comprises the following steps that: a server receives the digital content downloading request sent by the client and acquires the mark of the digital content which is required by the client to be downloaded; the server determines whether or not to provide the digital content to the client according to the copied digital mark corresponding to the mark of the digital content, wherein the copied digital mark is used for recording the current number of times capable of downloading the digital content; and when the digital content is determined to be provided for the client, the server sends a certification of authentication for allowing the downloading of the digital content to the client.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of digital content download control method, Apparatus and system.
Background technology
Along with development of internet technology and universal, the quantity of digital contents such as audio frequency, video, picture, document is more and more, uses also more and more widely the propagation of digital content and shared become convenient and quick.But, because digital content has the characteristics duplicating and propagate of being easy to, cause the digital content illegal circulation, make the digital content of utilizing great amount of cost and manpower to make be easy under unauthorized situation by bootlegging and propagation, thereby digital content right people's interests have been damaged, influence digital content creator's enthusiasm, thereby hinder the development of digital content business.
The technology that occurs for the bootlegging, propagation and the use that effectively prevent digital content is called digital copyright management (DRM, Digital Rights Management) technology.For example, service end is when the request of the download digital content that receives the client transmission, can carry out authentication to the download authority of this client in several ways, authentication by the time just allow the client downloads digital content, otherwise just refuse the download request of client, thereby can avoid digital content to be downloaded and propagate by the disabled user.
But, existing DRM technology and imperfection, the legitimate client of mandate have a lot, and digital content still can arbitrarily be downloaded by a large amount of clients, and the copyrighted digital content owner who has does not want to allow the digital content of oneself arbitrarily be downloaded, even if legitimate client.
Summary of the invention
The embodiment of the invention provides a kind of digital content download control method, Apparatus and system, in order to the quantity of client of control download digital content, avoids digital content arbitrarily to be downloaded by a large amount of clients.
A kind of digital content download control method that the embodiment of the invention provides comprises:
Server receives the digital content download request that client sends, and therefrom obtains the sign of the digital content of this client-requested download;
Described server is according to identifying with the corresponding duplicate number of the sign of described digital content, and determining whether provides described digital content to described client, and wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content;
When determining that when described client provides described digital content described server sends the certificate of authority that allows to download described digital content to described client.
A kind of digital content method for down loading that the embodiment of the invention provides comprises:
User end to server sends the download request of digital content, comprising the sign of the digital content of asking to download;
Described client receives the certificate of authority that described digital content is downloaded in permission that described server sends, and obtains described digital content by this certificate of authority;
Described client sends the request of giving back described digital content to described server, comprising the sign of described digital content.
A kind of server that the embodiment of the invention provides comprises:
Database is used for the sign of storing digital content and the corresponding relation that the duplicate number identifies, and the download address of digital content;
Receive the download request unit, be used to receive the digital content download request that client sends, and therefrom obtain the sign of the digital content of this client-requested download;
Duplicate is counted identifying unit, be used to utilize the sign of the digital content that described reception download request unit obtains, from described database, obtain corresponding duplicate number sign, and determine whether to provide described digital content to described client according to this duplicate number sign, wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content;
Issue certificate of authority unit, be used for described server, send the certificate of authority that allows to download described digital content to described client when determining when described client provides described digital content.
A kind of client that the embodiment of the invention provides comprises:
Send the download request unit, be used for sending the download request of digital content, comprising the sign of the digital content of asking to download to server;
The digital content download unit is used to receive the certificate of authority that described digital content is downloaded in permission that described server sends, and obtains described digital content by this certificate of authority;
Request unit is given back in transmission, is used for sending the request of giving back described digital content to described server, comprising the sign of described digital content.
A kind of digital content downloading system that the embodiment of the invention provides comprises:
Server is used to receive the digital content download request that client sends, and therefrom obtains the sign of the digital content of this client-requested download; According to identifying with the corresponding duplicate number of the sign of described digital content, determining whether provides described digital content to described client, and wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content; When determining when described client provides described digital content, send the certificate of authority that allows to download described digital content to described client;
Client is used for the download request to server transmission digital content, comprising the sign of the digital content of asking to download; The certificate of authority of described digital content is downloaded in the permission that reception server sends, and obtains described digital content by this certificate of authority.
The embodiment of the invention receives the digital content download request that client sends by server, and therefrom obtains the sign of the digital content of this client-requested download; Described server is according to identifying with the corresponding duplicate number of the sign of described digital content, and determining whether provides described digital content to described client, and wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content; Described server is when determining when described client provides described digital content, send the certificate of authority that allows to download described digital content to described client, thereby realized the random download of a large amount of clients to digital content avoided in the quantity control of the client of download digital content.
Description of drawings
Fig. 1 disposes schematic diagram for a kind of digital content downloading system that the embodiment of the invention provides;
The general structure schematic diagram of a kind of digital content downloading system that Fig. 2 provides for the embodiment of the invention;
The concrete structure schematic diagram of a kind of digital content downloading system that Fig. 3 provides for the embodiment of the invention;
The structural representation of a kind of database that Fig. 4 provides for the embodiment of the invention;
A kind of digital content register method schematic flow sheet that Fig. 5 provides for the embodiment of the invention;
The idiographic flow schematic diagram of a kind of digital content method for down loading that Fig. 6 provides for the embodiment of the invention;
Fig. 7 gives back the method flow schematic diagram for a kind of digital content that the embodiment of the invention provides;
The overall procedure schematic diagram of a kind of digital content download control method that Fig. 8 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of digital content download control method, Apparatus and system, be used for the download of digital content is controlled, the quantity of the client of control download digital content avoids digital content arbitrarily to be downloaded by a large amount of clients, protection digital content right people interests; And, further the digital content of client downloads is set to encrypted digital content, issue the certificate of authority that comprises the key that is used for decrypts digital content by server, thereby the illegal propagation of control figure content is downloaded fail safe thereby improve digital content.
Identify by the duplicate number that digital content is set in the embodiment of the invention, being used for that recording digital content is current can be by the number of times of client downloads, the technical scheme of the digital content downloading control that the embodiment of the invention provides is similar to the taking care of books in library, for example, the books one of same content have 100, if currently borrowed 50, then also surplus 50 can lend, after the reader returned books, these books can also continue to be lent.In like manner, count the current number of times that can be downloaded of a certain digital content of identification record by duplicate in the embodiment of the invention, for example, a certain digital content is set when server is initial can be downloaded altogether 100 times, then the initial value of duplicate number sign is 100, when this digital content is downloaded once, the value that the duplicate number sign of this digital content then is set subtracts 1, when client transmission return request was expired to the useful life of server or this digital content, the value that the duplicate number sign of this digital content then is set added 1.Need to prove, with actual borrow books different be, do not need really to store a plurality of duplicates of same digital content in the server that the embodiment of the invention provides, and only need a duplicate to count that this digital content of identification record is current can be realized quantity control to the client of download digital content by the number of times of client downloads.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 1, embodiment of the invention system comprises the device of end side and network side.The client of end side can have multiple, for example: notebook computer, desktop computer, handheld device or the like.The server that network side comprises also has multiple, and for example: webpage (Web) server, database server and file server certainly, are integrated in Web server, database server and file server on one station server and also are fine.Particularly, as shown in Figure 2, the client-requested Web server carries out digital content and downloads, Web server is to the client authentication, digital content current whether can also be downloaded of authentication by judging further that then this client-requested is downloaded, if can, then from database server, obtain the download address (URL address) of this digital content and the key of this digital content etc., generate the certificate of authority of this digital content, this certificate of authority is handed down to this client, after this client receives this certificate of authority, utilize URL address wherein to obtain digital content from the file server download, and further utilize secret key decryption in this certificate of authority, obtain real digital content.Provide specific descriptions below.
Referring to Fig. 3, a kind of digital content downloading system that the embodiment of the invention provides specifically comprises:
The certificate of authority of the permission download digital content that client 11 reception servers 12 send, and by this certificate of authority download digital content.
Preferably, comprise the download address of this digital content in the certificate of authority of digital content, i.e. the URL address of this digital content, client 11 is utilized this URL address download digital content.Further, the digital content that client 11 is downloaded is through the digital content after encrypting, so further comprise the key of this digital content in the certificate of authority of this digital content, client 11 utilizes this key that the digital content of downloading is decrypted, and obtains real digital content.
Preferably, client 11 is clients with download qualification of passing through through server 12 authentications, and concrete method for authenticating can have a lot.
Particularly, server 12 comprises:
Receive download request unit 122, be used to receive the digital content download request that client 11 sends, and therefrom obtain the sign of the digital content of these client 11 request downloads.
User authority management unit 123 is used to judge whether described client 11 has the authority of download digital content, when judging that described client 11 has the authority of download digital content, triggers duplicate and counts identifying unit 124.
Duplicate is counted identifying unit 124, be used for triggering according to user authority management unit 123, the sign of the digital content of obtaining according to described reception download request unit 122, from database 121, find corresponding duplicate number sign, and determine whether to provide its digital content that request is downloaded to described client 11 according to this duplicate number sign.
Issue certificate of authority unit 125, being used for counting identifying unit 124 when duplicate determines when described client 11 provides digital content, from database 121, obtain the download address and the key of this digital content, generate the certificate of authority of this digital content and be handed down to described client 11.Further, this certificate of authority is bound mutually with this digital content, and, make client 11 the use deadline that also comprises this digital content in this certificate of authority before this digital content of visit, at first checks the use deadline of this digital content of putting down in writing in this certificate of authority, if currently do not exceed this use deadline, then export this digital content and give the user, otherwise can't visit this digital content, export the message that this digital content can't visit and give the user.
Preferably, described duplicate is counted identifying unit 124 and is comprised:
The described certificate of authority unit 125 that issues further will subtract 1 with the value of the corresponding duplicate number sign of the sign of this digital content when the certificate of authority of digital content successfully is handed down to described client 11.
Preferably, described server 12 also comprises:
Preferably, described server 12 also comprises:
Preferably, client 11 comprises:
Send download request unit 111, be used for sending the download request of digital content, comprising the sign of the digital content of asking to download to server 12.
Digital content download unit 112 is used to receive the certificate of authority of the permission download digital content that described server 12 sends, and obtains digital content by this certificate of authority.
Preferably, described digital content download unit 112 comprises:
Receive certificate of authority unit 1121, be used for the certificate of authority of the permission download digital content of reception server 12 transmissions, and therefrom obtain the key of the download address and the digital content of digital content.
Further, described reception certificate of authority unit 1121 has also obtained digital content from the certificate of authority that receives use deadline, described client 11 also comprises:
Access digital content unit 114, be used for when receiving the indication of user capture digital content, judge the current use deadline that whether surpasses this digital content of putting down in writing in the certificate of authority of this digital content, if then export the message that this digital content can't visit and give the user; Otherwise, export this digital content and give the user.
Certainly, described database 121 also can be arranged on as shown in Figure 2 another database server, the concrete structure of database 121 as shown in Figure 4, database 121 comprises 4 tables, wherein, the digital content record sheet is used for the unique identification (DRID) of recording digital content, the URL address of digital content (through encrypted digital content), key, and initial value of duplicate number sign (total duplicate number) and currency (residue duplicate number), wherein, when digital content was registered initially and is not downloaded, the currency of duplicate number sign equaled the initial value of duplicate number sign.The Download History table is used to write down the download message of client, every download message all has the recording mechanism of this download message of unique identification, at digital content download each time, a download message is all arranged, and concrete download message comprises user ID (sign of client just), the sign of digital content, the time of this digital content of client downloads and the Expiration Date of this digital content.Download management unit 126 in the server 12, promptly pass through the record of this Download History table, the monitoring digital content is downloaded the time of using by described client 11, when this time surpasses pre-set threshold, the currency with the corresponding duplicate number sign of sign this digital content that write down in the digital content record sheet is added 1.Download history table, be used to write down the download message of all bars, request unit 127 is given back in reception in the server 12, receive the request of giving back digital content that client 11 sends, and therefrom obtain the sign of this digital content, currency with the corresponding duplicate number sign of sign this digital content in the digital content record sheet is added 1, simultaneously, the pairing download message of the sign of this digital content is transferred to from the Download History table in the download history table, to make things convenient for server admin down operation record, because the Download History table can constantly expand along with the increase of time, and this table is often to use, so whole flow process (need be comprised the download of digital content, give back or expire) in completed operation note transfer to and download in the history table, to improve the operating characteristics of server.User message table is used for the recording user relevant information, for example user ID and client-side information etc., and the user authority management unit 123 in the server 12 comes client 11 is carried out authentication by the record of this user message table.
Certainly, also be provided with the digital content registration unit in the server 12, be used for registering in advance digital content to be downloaded, to encrypt digital content, digital content after encrypting is stored in the file server, with sign, URL address, the key of every digital content, and the initial value of duplicate number sign is documented in the digital content record sheet in the database.
Introduce the method that the embodiment of the invention provides below.
Referring to Fig. 5, a kind of digital content register method that the embodiment of the invention provides comprises step:
S501, be that every digital content generates unique sign.
S502, importing wall scroll digital content.
S503, generation are also preserved the initial value of the duplicate number sign of wall scroll digital content.
S504, encryption wall scroll digital content, and the digital content behind the storage encryption.
The key information of S505, preservation digital content.
S506, judge whether the digital content that also have to need imports, if then return execution in step S502; Otherwise finishes registration operation.
Referring to Fig. 6, a kind of digital content method for down loading that the embodiment of the invention provides comprises step:
S601, user end to server send the request of download digital content.
S602, server judge whether client has the authority download digital content, if then carry out step S603; Otherwise, carry out step S604.
S603, server obtain the sign of digital content from the request of the download digital content of client transmission.
S604, server send the request message of refusal download digital content to client.
S605, server judge that whether the pairing duplicate number sign of the sign of the digital content that client-requested is downloaded is greater than zero, if then carry out step S606; Otherwise, carry out step S604.
S606, server read the key and the download address of the digital content of client-requested download from database.
The key of S607, server by utilizing digital content and download address generate the certificate of authority, and issue this certificate of authority to client.
S608, client receive and resolve the certificate of authority, obtain the download address and the key of digital content.
S609, client utilize download address from the file server download digital content.
The digital content that S610, client utilize secret key decryption to download is reproduced real digital content.
S611, server subtract 1 with the currency of the pairing duplicate number sign of the sign of the digital content of client-requested download.
The download message of S612, server record client downloads digital content comprises digital content unique identification DRID, download time, download user, download approval time limit of download or the like.
Wherein, step S611 and S612 carry out behind client success download digital content, also can be just to carry out after step S607.
The useful life of the digital content of client downloads expires or client when initiatively giving back this digital content, and server adds 1 with the currency of the duplicate number sign of this digital content.
After introducing client below and successfully having downloaded digital content, give back the concrete grammar that this digital content is given server.
Referring to Fig. 7, the method for giving back of a kind of digital content that the embodiment of the invention provides comprises step:
S701, user end to server send the request of giving back digital content, the sign of the digital content of giving back comprising request.
S702, server receive the request of giving back digital content that client sends, and the sign of the request of therefrom the obtaining digital content of giving back.
S703, server are transferred to the pairing download message of sign of the digital content that client-requested is given back in the download history table.
The currency of the pairing duplicate number sign of the sign of the digital content that S704, server update client-requested are given back is about to this value and adds 1.
Wherein, the order of step S703 and S704 can be exchanged.
In sum, referring to Fig. 8, a kind of download control method of digital content safely and effectively that the embodiment of the invention provides comprises step:
S801, server receive the digital content download request that client sends, and therefrom obtain the sign of the digital content of this client-requested download.
S802, server basis identify with the corresponding duplicate number of sign of the digital content that client-requested is downloaded, and determining whether provides its digital content that request is downloaded to client.
S803, when determining that when client provided its digital content that request is downloaded, server sent the certificate of authority that allows to download this digital content to client.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (23)
1, a kind of digital content download control method is characterized in that, this method comprises:
Server receives the digital content download request that client sends, and therefrom obtains the sign of the digital content of this client-requested download;
Described server is according to identifying with the corresponding duplicate number of the sign of described digital content, and determining whether provides described digital content to described client, and wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content;
When determining that when described client provides described digital content described server sends the certificate of authority that allows to download described digital content to described client.
2, method according to claim 1 is characterized in that, described server is according to identifying with the corresponding duplicate number of the sign of described digital content, and determining whether provides the step of described digital content to comprise to described client:
Described server finds with this and identifies corresponding duplicate number sign according to the sign of described digital content;
Whether described server judges the value of described duplicate number sign greater than zero, if then determining provides described digital content to described client; Otherwise refusal provides described digital content to described client.
3, method according to claim 1 is characterized in that, described server is when determining that this method also comprises when described client provides described digital content:
Described server subtracts 1 with the value of described duplicate number sign.
4, method according to claim 1 is characterized in that, described server issues after the described certificate of authority, and this method also comprises:
Described server receives the request of giving back described digital content that described client sends, and therefrom obtains the sign of described digital content;
Described server find the corresponding duplicate number sign of this sign, and the value that this duplicate number is identified adds 1 according to the sign of described digital content.
5, method according to claim 1 is characterized in that, described server issues after the described certificate of authority, and this method also comprises:
The described digital content of described server monitoring is by the time of described client downloads, and when this time surpassed pre-set threshold, described server added 1 with the value of described duplicate number sign.
6, method according to claim 1 is characterized in that, described digital content is the digital content after encrypting, and comprises the key of the download address and the described digital content of described digital content in the described certificate of authority.
7, method according to claim 6 is characterized in that, the described certificate of authority is bound mutually with described digital content, and, also comprise use deadline of described digital content in the described certificate of authority.
According to the described method of the arbitrary claim of claim 1 to 7, it is characterized in that 8, when described server received the digital content download request of client transmission, this method also comprises: described server carried out authentication to described client;
When described client authentication was passed through, described server obtained the sign of the digital content of this client-requested download from the digital content download request that described client sends.
9, a kind of digital content method for down loading is characterized in that, this method comprises:
User end to server sends the download request of digital content, comprising the sign of the digital content of asking to download;
Described client receives the certificate of authority that described digital content is downloaded in permission that described server sends, and obtains described digital content by this certificate of authority;
Described client sends the request of giving back described digital content to described server, comprising the sign of described digital content.
10, method according to claim 9 is characterized in that, comprises the key of the download address and the described digital content of described digital content in the described certificate of authority, and described client is obtained described digital content by the described certificate of authority and comprised:
Described client is utilized described download address download digital content, and according to described key, the decrypted digital content that described download is obtained.
11, method according to claim 10 is characterized in that, also comprises the use deadline of described digital content in the described certificate of authority, and the step of the described digital content of described client-access comprises:
Described client is judged the current use deadline that whether surpasses the described digital content of putting down in writing in the described certificate of authority, if then export the message that described digital content can't be visited; Otherwise, export described digital content.
12, a kind of server is characterized in that, this server comprises:
Database is used for the sign of storing digital content and the corresponding relation that the duplicate number identifies, and the download address of digital content;
Receive the download request unit, be used to receive the digital content download request that client sends, and therefrom obtain the sign of the digital content of this client-requested download;
Duplicate is counted identifying unit, be used to utilize the sign of the digital content that described reception download request unit obtains, from described database, obtain corresponding duplicate number sign, and determine whether to provide described digital content to described client according to this duplicate number sign, wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content;
Issue certificate of authority unit, be used for described server, send the certificate of authority that allows to download described digital content to described client when determining when described client provides described digital content.
13, server according to claim 12 is characterized in that, described duplicate is counted identifying unit and comprised:
Search the unit, be used for the sign of the digital content obtained according to described reception download request unit, from described database, find and the corresponding duplicate number sign of the sign of this digital content;
Judging unit is used to judge that whether the described value of the duplicate number sign that the unit finds of searching is greater than zero, if then trigger the described certificate of authority unit that issues; Otherwise refusal provides described digital content to described client.
14, server according to claim 12 is characterized in that, the described certificate of authority unit that issues further will subtract 1 with the value of the corresponding duplicate number sign of the sign of described digital content when successfully sending the described certificate of authority.
15, server according to claim 12 is characterized in that, described server also comprises:
Request unit is given back in reception, is used to receive the request of giving back digital content that described client sends, and therefrom obtains the sign of this digital content, will add 1 with the value of the corresponding duplicate number sign of the sign of described digital content.
16, server according to claim 12 is characterized in that, described server also comprises:
The download management unit is used to monitor described digital content by the time of described client downloads, when this time surpasses pre-set threshold, will add 1 with the value of the corresponding duplicate number sign of the sign of described digital content.
17, according to the described server of the arbitrary claim of claim 12 to 16, it is characterized in that described server also comprises:
The user authority management unit is used to judge whether described client has the authority of downloading described digital content, when judging that described client has the authority of downloading described digital content, triggers described duplicate and counts identifying unit.
18, a kind of client is characterized in that, this client comprises:
Send the download request unit, be used for sending the download request of digital content, comprising the sign of the digital content of asking to download to server;
The digital content download unit is used to receive the certificate of authority that described digital content is downloaded in permission that described server sends, and obtains described digital content by this certificate of authority;
Request unit is given back in transmission, is used for sending the request of giving back described digital content to described server, comprising the sign of described digital content.
19, client according to claim 18 is characterized in that, described digital content download unit comprises:
Receive certificate of authority unit, be used to receive the permission that described server sends and download the certificate of authority of described digital content, and therefrom obtain the key of the download address and the described digital content of described digital content;
Download unit is used to utilize described download address to download described digital content;
Decrypting device is used to utilize described key that the digital content that described download obtains is decrypted.
20, client according to claim 19 is characterized in that, also comprises the use deadline of described digital content in the described certificate of authority, and described client also comprises:
The access digital content unit, be used for when receiving the indication of user capture digital content, judge the current use deadline that whether surpasses this digital content of putting down in writing in the certificate of authority of this digital content, if then export the message that this digital content can't be visited; Otherwise, export this digital content.
21, a kind of digital content downloading system is characterized in that, this system comprises:
Server is used to receive the digital content download request that client sends, and therefrom obtains the sign of the digital content of this client-requested download; According to identifying with the corresponding duplicate number of the sign of described digital content, determining whether provides described digital content to described client, and wherein, described duplicate number sign is used to write down the current number of times that can be downloaded of described digital content; When determining when described client provides described digital content, send the certificate of authority that allows to download described digital content to described client;
Client is used for the download request to server transmission digital content, comprising the sign of the digital content of asking to download; The certificate of authority of described digital content is downloaded in the permission that reception server sends, and obtains described digital content by this certificate of authority.
22, system according to claim 21 is characterized in that, described server comprises:
Database is used for the sign of storing digital content and the corresponding relation that the duplicate number identifies, and the download address of digital content;
Receive the download request unit, be used to receive the digital content download request that described client sends, and therefrom obtain the sign of the digital content of this client-requested download;
Duplicate is counted identifying unit, is used to utilize the sign of the digital content that described reception download request unit obtains, and obtains corresponding duplicate number sign from described database, and determines whether to provide described digital content to described client according to this duplicate number sign;
Issue certificate of authority unit, be used for sending the certificate of authority that allows to download described digital content to described client when determining when described client provides described digital content.
23, according to claim 21 or 22 described systems, it is characterized in that described client comprises:
Send the download request unit, be used for sending the download request of digital content, comprising the sign of the digital content of asking to download to described server;
The digital content download unit is used to receive the certificate of authority that described digital content is downloaded in permission that described server sends, and obtains described digital content by this certificate of authority;
Request unit is given back in transmission, is used for sending the request of giving back described digital content to described server, comprising the sign of described digital content.
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CNA2008102221592A CN101355569A (en) | 2008-09-10 | 2008-09-10 | Control method, apparatus and system for downloading digital content |
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CNA2008102221592A CN101355569A (en) | 2008-09-10 | 2008-09-10 | Control method, apparatus and system for downloading digital content |
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