CN102055781A - Digital file distribution method based on network - Google Patents
Digital file distribution method based on network Download PDFInfo
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- CN102055781A CN102055781A CN2009102095861A CN200910209586A CN102055781A CN 102055781 A CN102055781 A CN 102055781A CN 2009102095861 A CN2009102095861 A CN 2009102095861A CN 200910209586 A CN200910209586 A CN 200910209586A CN 102055781 A CN102055781 A CN 102055781A
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Abstract
The invention relates to a digital file distribution method based on a network, which comprises the following major steps: 1, processing the content of a file to be distributed until the content is in such a state that the content can not be directly acquired by an access program; 2, transmitting a file the content of which is in a processed state; 3, after a user acquires the file the content of which is in a processed state, recovering the content of the file, and simultaneously storing the file in a storage environment which can prevent the file from being copied and moved and check the access program; and 4, in the storage environment, providing an access to the content of the digital file for an application program. By using the method, the invention ensures that the digital file can be protected in the whole distribution process.
Description
Technical field
Content of the present invention relates to the digital document network distribution system.Specifically tell about a kind of method by the net distribution digital document.Wherein, by digital document being encapsulated distribution, depositing in and can limit bootlegging, the illegal measures such as storage environment of moving and can check access program of restriction, realize digital document in whole distribution procedures such as propagation, storage, use not by the purpose of bootlegging and protected file content.
Background technology
Chinese invention patent 200910008922.6 has been introduced a kind of method that user-defined access control mode is provided in file system.Provide the file system of user-defined access control mode to have to support the customized file access operation of user the function of corresponding access control proof procedure.
Provide the file system of user-defined access control mode that the platform on a basis is provided for file content protection work from the angle of access visit.In the file system of user-defined access control mode is provided, meet the access control proof procedure of demand by appointment, can realize easily that data file is not by the purpose of illegal operation.
Chinese invention patent 200910147998.7 has further been introduced a kind of method that prevents copy documents illegally under distributed environment.The document storage system that utilizes this method to realize can be provided with to require in processes such as using, store and move according to file avoids file to suffer bootlegging.
The document storage system of realizing according to 200910147998.7 introduction methods of Chinese invention patent work to protection digital document under the network environment on file storage, file uses and file moves the angle provides effective means, both can build a networked storage environment of avoiding digital document to suffer bootlegging and unauthorized access.
The net distribution work of digital document comprises the propagation of digital document, the storage of digital document, numerous links such as use of digital document.Only utilize and in the memory location, protect internal file and duplicate two whole net distribution work that technological means can not cover digital document such as generation in distributed environment lower limit manufacture-illegal method; especially the propagation link of digital document, thereby the protection that is provided for the digital document distribute work that makes and imperfect.
Summary of the invention
Based in storage, providing file protect, in moving process, avoiding two means such as file copy; if in the propagation of digital document, add the measure of avoiding bootlegging and stoping unauthorized access again; to form a protection mechanism that covers all links such as propagation in the digital document distribute work, use, storage, and then reduce effectively that content that the digital document distribute work faces is revealed and threat such as bootlegging.
Among the present invention, be: at first, the file that distribute is carried out contents processing, make its content be in the state that access program can't directly obtain by the pairing core thinking of the method for net distribution digital document; Secondly, the file that content is in processed state is propagated; The 3rd, after the user obtains file that content is in processed state, when file content is recovered and with file, be kept at and can limit file copy, can limit file and move and check in the storage environment of access program; The 4th, the access to content of digital document is provided to application program in this storage environment.
Based on this thinking, the method by the net distribution digital document among the present invention comprises the following aspects:
1 distributor is converted to a kind of specific form of changing identification information that has with digital document, and for the digital document that is in specific form specify become the required satisfied answer condition of original form again and reply original form after with the configuration information of carrying;
2 distributors provide corresponding network acquisition methods for the digital document that is in specific form;
The 3 network acquisition methods that utilize the distributor to provide, the user obtains to be in the digital document of specific form by network;
4 users construct the required specific environment of digital document that a kind of use is in specific form;
5 reply conditional test by specific environment to the digital document that is in specific form, the digital document that only is in specific form under the situation that the answer condition is set up could be replied and is original form, will be arranged in specific environment and reply to the digital document after original form;
The 6 file access interfaces that utilize specific environment to provide, the content of the addressable digital document of application program.
In above-mentioned measure, conversion is meant that file content such as is encrypted, hides, cuts apart at means to be handled, and changes digital document into application program and can't utilize the file access interface directly to obtain the former meaningful specific form of file.Answer is meant that the file answer that will enter specific form through conversion is the original form before the conversion.
To specify a conversion identification information for file in the transfer process, and the conversion identification information can be a symbol string, also can be made up of jointly a plurality of symbol strings.
After replying original form with aspect the configuration information of carrying, the content of distributor's appointment comprises the access control configuration information that is associated with digital document, for example specifies how to manage with the copy operation of file association, how to manage with the move operation of file association and how the program of access file content is tested etc.
The network acquisition methods that the distributor provided is meant to the user provides by network and obtains the available approach of file and utilize the required necessary information of using of available approach acquisition file, for example chat tool of the mode of the mode of file in download and corresponding download method, e-mail transmission manner and e-mail connection mode, point-to-point transmission and correspondence and contact number of the account etc.The network acquisition methods that the user utilizes the distributor to provide can obtain being in the digital document of specific form.
Specific environment comprises memory cell that file storage service is provided and supports the file access interface and the Add-ons unit that other functions are provided.
Memory cell comprises the memory space that is used for log file, and provide file access interface around memory space, file management interfaces such as access to content interfaces such as for example, file reads, file writes and new files, deleted file, xcopy, move.Memory cell has the function of managing copy operation and move operation according to the file association configuration information, and can also be provided with according to file association the program of access file content is checked, distinguish whether access program has the feature of defined in the file association configuration information.Wherein, the purpose of management copy operation comprises the generation of avoiding file to illegally copy, and the purpose of management move operation comprises and avoids file illegally to be moved, and for example moves to outside the memory node.
The function that the Add-ons unit possesses comprises that the digital document that will be in specific form becomes the digital document that is positioned within the memory cell and is in original form.
Replying conditional test is to check the work of whether setting up with the answer condition of file association.Reply two identical files of conditional test transfer dehorn knowledge information and be considered to same file.
Aspect the condition of answer, the associated answer condition of digital document that is in specific form is identical on whole distributing network, can not change because of the variation of user or particular surroundings.
The digital document that utilizes said method and carry out is distributed in aspects such as propagation, storage, use all to have relative measures and protects digital document; even can initiatively stop unauthorized access, this prevents that for requiring the large-scale distribution of digital document content leakage is helpful.For example:
Film of 1 publisher distribution, movie file and sign can be bound together and be packaged into a movie file that is in specific form, and specify the answer condition that to carry out a Recovery Process for this movie file that is in specific form, also specify the configuration information that can not be replicated, can not move out specific environment and only have the specific access program to visit for this movie file;
2 publishers peddle the movie file that is in specific form on e-commerce website, and obtain the pairing network acquisition methods of movie file that is in specific form for the buyer provides;
3 users buy and obtain this movie file that is in specific form by e-commerce website;
4 users reply conditional test by specific environment to the movie file that is in specific form, and the movie file that will be in specific form is then replied to being positioned at the movie file that specific environment corresponding stored unit is in original form;
5 users utilize the broadcast instrument meet the movie file requirement to watch to be positioned at the movie file that specific environment corresponding stored unit is in original form.
In said process, the main body of peddling in process and the communication process is the movie file that is in specific form, and the former meaningful of movie file can't be visited, and makes that content can not take place this moment to be revealed.Owing to when carrying out the answer conditional test, can judge whether the movie file that is in specific form was replied according to the sign that binds together, and then the movie file that is in specific form is carried out copy operation can't cause extra movie file generation, also just guaranteed the quantitative certainty of movie file.Can forbid that copy operation takes place according to the configuration information of publisher because of memory cell again, thereby can avoid movie file number change in memory cell, to occur.Be provided with in addition and can not shift out specific environment, make movie file be under the protect bit cell all the time.At last, memory cell can also guarantee to have only specific program can visit movie contents according to the configuration information of publisher, further in use guaranteed the safety of movie file content again.
And then the distribution method that utilizes the present invention to introduce distributes digital document, can guarantee that digital document all is protected in whole distribution procedure.For the distributor of claimed digital document content, distribution method of the present invention is a convenient net distribution mode that satisfies distribution requirements of energy.
Description of drawings
Fig. 1 is the exemplary plot that the conversion identification information comprises a plurality of character string time institute corresponding record form.
Embodiment
Utilize digital document network distribution system that the present invention realizes at first on the user stores the link of digital document, to have the function of protected file, secondly also have the function of protected file in the transmission course from distributor to user.Introduce a kind of embodiments of the present invention below, this execution mode is based on execution mode described in execution mode described in the Chinese invention patent 200910147998.7 and the Chinese invention patent 200910008922.6, particular content is as follows, and the digital document that wherein is in specific form is called the digital document specific form for short:
The composition of dissemination system
In this enforcement, the hardware of dissemination system forms and to comprise computer equipment (being referred to as distributor's computer), the webserver (being referred to as Download Server) that is used for spreading digital file specific form, the computer equipment (being referred to as user's computer) that is used to store and use digital document of making the digital document specific form, be used to guarantee between the specific form of digital document and digital document mutually the webserver (being referred to as change server) of conversion smoothly.In addition, have the network environment that to visit mutually between the said equipment.
Distributor's computer
In this enforcement, to make the digital document specific form and finished by the switching software that is positioned on distributor's computer, the process that switching software is made the digital document specific form comprises following basic step:
1 requires distributor's designated conversion server, and connects with change server;
2 require distributor's input digit fileinfo and distributor's information, and are transferred to change server;
3 require the distributor to select to change the type of identification information, and submit to change server, then the entrained conversion identification information of digital document specific form that will make from the change server acquisition;
4 require the distributor to select to encrypt in the transfer process cryptographic algorithm of using;
5 submit the selected cryptographic algorithm of distributor to change server, and obtain encryption key and key to identification number from change server;
6 require distributor's specified file to reply after original form the configuration information of carrying;
7 require distributor's specified file to reply the answer condition that original form should meet;
8 finish the encrypted work at the digital document content, and make the specific form of digital document;
9 identifying informations to change server submission digital document specific form;
10 to change server submission and digital document specific form associated answer condition and the required necessary information of check answer condition.
In this enforcement, used cryptographic algorithm was specified by the distributor when switching software was encrypted the data file content, if change server can not support that to the cryptographic algorithm of distributor's appointment then the transfer process of switching software will be ended.
In this enforcement, conversion identification information type comprises that the conversion identification information is single character string and conversion identification information and two types such as forms jointly by a plurality of character strings.Wherein, conversion identification information type is a plurality of character strings when forming jointly, change server will return three identification strings such as distributor's sign, digital document sign, conversion work numbering the conversion identification information of composition jointly.
In this enforcement, the distributor is to be used in the file system of user-defined access control mode (Chinese invention patent 200910008922.6) is provided the associated configuration information of the self-defined access control work of management with the configuration information of carrying after for the original form of the answer of file appointment, specifically comprises requirement for restriction to copy operation, to the requirement for restriction of move operation, the feature that access program should have etc.Wherein, the method to set up of forbidding file is moved out memory cell is for specifying a method of inspection to move operation, and this method of inspection can be judged the target location of move operation, can refuse move operation in the time of outside the target location is memory cell and carry out.
In this enforcement, the file format of digital document specific form will be used the form with the Chinese invention patent 200910147998.7 encrypted state file in the execution mode of introducing, only be wherein additionally the content implication that the individual data item is write down in the data structure to be set change has taken place, but the form of each data item recorded content still adopt the additional record form that data structure corresponding data item is set in the encrypted state file.
In this enforcement, adding in the data literal specific form actual content that the file identification information correspondence position is write down in the data structure is set is to obtain the conversion identification information by the change server place.Wherein, in the transformational marker information type is that a plurality of character strings are when forming jointly, the recording mode of conversion identification information can be done simple expansion on the recording mode of Chinese invention patent 200910147998.7 file identification information in the execution mode of introducing, concrete as Fig. 1.Compare Chinese invention patent 200910147998.7 and introduce the recording mode of the interior file identification information of encrypted state file in the execution mode, when utilizing original file ID mark to come mark conversion identification information data content, increased following mark:
Distributor ID is used for mark distributor sign;
Data file ID is used for the flag data file identification;
Transform NO is used for mark conversion work numbering.
Based on these marks, the implication of the conversion identification information correspondence that is write down among Fig. 1 is that the conversion identification information of digital document specific form is made up of three symbol strings, be respectively expression distributor sign ABC, expression digital document sign 011198890 and expression conversion work numbering 0.
In this enforcement, in the digital document specific form additional be provided with access control setting information is write down in the data structure content for the distributor to the original form of the answer of file appointment after with the configuration information of carrying, promptly manage the associated configuration information of self-defined access control work.
In this enforcement, the additional content that the configuration information record of interior transition operation of data structure and answer operative association is set is cryptographic algorithm, the access mode of change server and the answer condition of distributor's appointment etc. that switching software uses in the digital document specific form.
In this enforcement, to introduce in the execution mode content association identical with Chinese invention patent 200910147998.7 fully for the be provided with content of replying condition and record form.
In this enforcement, switching software can provide the identifying information of digital document specific form to change server, and the content of process of submitting to and submission and Chinese invention patent 200910147998.7 are introduced in the execution mode in the transition operation implementation memory node and submitted to the submission process of encrypted state file identification information and submission content identical to replying the check server.
Download Server
In this enforcement, the network obtain manner that the distributor is provided for the digital document specific form is the FTP downloading mode, and its step is mainly as follows:
1 installs a FTP service system on Download Server;
2 digital documents that will be in specific form are put into the FTP catalogue that is used for providing the file download on the Download Server;
3 access method and digital document specific form place FTP catalogues with Download Server FTP service are published on the Internet.
In this enforcement, the user obtains Download Server FTP service access method on the internet, obtains the digital document specific form in corresponding FTP catalogue.
User's computer
In this enforcement, user's computer will be installed Chinese invention patent 200910147998.7 memory node that provides in the execution mode of introducing, and the use memory node serves as the memory cell in the specific environment of the present invention.Because memory node the file storage service of providing is provided and the attribute of file access interface is provided, can limit with the copy operation of file association and move operation and to the program of access file according to file association setting again and test, thereby also just meet in the specific environment requirement memory cell.
In this enforcement, because the encrypted state file format of execution mode is identical described in the form of digital document specific form and the Chinese invention patent 200910147998.7, and the function of relevant data item correspondence is the same substantially, thereby the Recovery Process of finishing the digital document specific form is operated in the answer that can utilize memory node to provide, and promptly memory node is seen as the encrypted state file with the digital document specific form and replys processing.
In this enforcement, it is change server that the interior answer of digital document specific form operative association is provided with the answer check server that writes down the position, make when the answer work of carrying out the digital document specific form and memory node to carry out mutual answer check server be change server, and the answer operation that utilizes memory node is replied answer operation implementation and related content for introducing referring to execution mode described in the Chinese invention patent 200910147998.7 in the detailed process of the original form of digital document with the digital document specific form.
In this enforcement, there is the answer software that matches with memory node on user's computer, its function is converted to the original form of digital document for the digital document specific form that will be positioned within the memory node, its course of work is replied the digital document specific form for the answer operation of directly calling memory node and providing, and the execution result of Recovery Process is informed the user.
In this enforcement, there is the importing software that matches with memory node on user's computer, its function is replied to being positioned at the original form of digital document within the memory node for being positioned at digital document specific form outside the memory node, and it is specific as follows to import the course of work of software:
1 allows the user select the digital document specific form that will reply;
2 allow the user select to reply the memory location of gained digital document in memory node;
3 copy to the digital document specific form in the designated storage location in the memory node;
Recovery Process is finished in the answer operation that 4 call memory node provides;
5 inform the user with the execution result of Recovery Process.
In this enforcement, in memory node, with reply the access control configuration information that is associated for the digital document of original form and come from two aspects are arranged, be respectively: the access control configuration information of (1) digital document itself, the i.e. specified access control configuration information content of distributor when making the digital document specific form, this information leaves in the digital document specific form, is converted into the entrained access control configuration information of digital document in the memory node in the Recovery Process; (2) the associated access control configuration information in corresponding stored position in the memory node of digital document place, the entrained access control configuration information of upper directory on file (catalogue) path, place.
In this enforcement, when memory node and change server are finished answer work jointly, it is that the encrypted state file is handled that memory node is used as the data file specific form, thereby can dissimilarly not distinguish operation according to what digital document specific form transfer dehorn was known information, only be that change server is submitted in the data content unification that the file ID mark that will be used for the identification document identification information in the encrypted state file format is comprised.
Change server
In this enforcement, between memory node on user's computer and change server, have the ability of identity each other of discerning, the approach of identification is for utilizing the identity recognizing technology based on digital certificate.Wherein, the granting of digital certificate is finished by third-party certificate management system, and the identity of the certificate representative of issuing comprises legal memory node and two classifications of legal change server.
In this enforcement, change server has Chinese invention patent 200910147998.7 and introduces answer check server and the related all functions of answer operation in the execution mode, can help memory node to finish Recovery Process, can carry out answer conditional test etc.
In this enforcement, when switching software was carried out conversion work on distributor's computer, change server for the reciprocal process that switching software provides conversion to support was:
The connection request of 1 response distributor computer;
2 accept information and distributor's information of the digital document that distributor's computer provides;
3 accept the conversion identification information type that distributor's computer provides, the conversion identification information of the information issuing respective type that provides according to the distributor then, and should change identification information and return to distributor's computer;
4 cryptographic algorithm that provide according to distributor's computer for its generate key to key to identification number;
5 return to distributor's computer with encryption key and key to the mark mark;
6 obtain the identifying information of digital document specific form with distributor's computer interactive;
7 accept answer condition and the check answer condition required necessary information associated with the digital document specific form that distributor's computer provides.
In this enforcement, change server is carrying out can writing down following information in the mutual process with distributor's computer: the pairing conversion identification information of (1) digital document specific form; (2) obtain the used cryptographic algorithm of digital document specific form; (3) the associated answer condition of digital document specific form; (4) identifying information that had of digital document specific form; (5) the pairing key of digital document specific form to and key to identification number; (6) support to reply other information of checking.
In this enforcement, information that change server write down and Chinese invention patent 200910147998.7 are introduced to reply in the execution mode and are checked the information that server write down to have relation one to one, reply the check server all functions relevant owing to change server has again, thereby the memory node on change server energy and the user's computer is finished the answer work of digital document specific form jointly with replying operation.
In this enforcement, change server is for the distributor safeguards distributor's database, be used to write down the distributor information and with the corresponding sign of distributor, sign is inequality between the different distributors.
In this enforcement, change server is that data file is safeguarded a data document data bank, be used for recording data files information, the corresponding sign of data file and conversion work numbering, also write down the associated distributor's sign of each data file, sign is different between the different pieces of information file.
In this enforcement, after distributor's computer was submitted distributor's information and data file information to, change server at first searched distributor's information in distributor's database, if do not find, then write down distributor's information and also generated sign for this distributor.Then, in the data file database, search the corresponding data fileinfo, if do not find, recording data files information and generate sign then to data file, the conversion work numbering data item that the data file correspondence is set at last is 0.
In this enforcement, when distributor's computer is selected to comprise the conversion identification information type of single character string, forwarding server can comprise the conversion identification information of singular id character string according to the information issuing that the distributor provides, its course of work is for to make the conversion identification information according to the content of distributor's database and data file database, and the form of specifically changing identification information is: distributor's sign _ data file sign _ conversion work numbering.Wherein, distributor sign, data file sign and conversion work numbering are respectively the corresponding data item content that distributor's database and data file lane database are associated with distributor's information and data file information.For example: ABC_011198890_0.Wherein: ABC is distributor's sign; 011198890 is the digital document sign; 0 is the conversion work numbering.
In this enforcement, during conversion identification information type that distributor's computer is selected to be made up of jointly a plurality of character strings, the information issuing that change server provides according to the distributor comprises the common conversion identification information of forming of a plurality of identification strings, is specially three identification strings such as using the distributor identifies, digital document sign, conversion work numbering respectively and represents the conversion identification information jointly.
In this enforcement, during conversion identification information that the memory node of change server on receiving user's computer submitted to, because the content that memory node is submitted to is the content that file identification information mark file ID is comprised, change server can at first be finished the work of distinguishing conversion identification information type, extracts relevant information according to the difference of type then and continues subsequently work.
In this enforcement, after switching software is finished the manufacturing process of digital document specific form jointly on change server and the distributor's computer, change server will the numerical value execution to the associated conversion work numbering of data file add 1 operation in the data file database.
In this enforcement, when memory node was finished the answer work of digital document specific form jointly on forwarding server and the user's computer, the file identification information that memory node is submitted to was exactly the conversion identification information of digital document specific form correspondence.Again since in the conversion identification information institute comprise conversion work and number and to have all different characteristics of each conversion, thereby the digital document specific form of two same transitions identification informations also has identical key certainly to identification number, finally makes the digital document specific form of two same transitions identification informations be equivalent to a file when the answer conditional test of change server.
In this enforcement, when the digital document specific form carries out Recovery Process on any user's computer, corresponding stored node on user's computer all need with the digital document specific form in the change server collaborative work of writing down, thereby make and can not change because of the variation of user's computer with the associated answer condition of digital document special state.
In addition, although above a kind of embodiment of the present invention, the form that the present invention is not confined to specific forms or is disclosed of having disclosed.Those skilled in the art can understand after poring over the application, under the prerequisite that does not break away from content of the present invention, scope and spirit and the equivalent things that obtains also in coverage of the present invention.
Claims (10)
1. method by the net distribution digital document may further comprise the steps:
(1) distributor is converted to a kind of specific form of changing identification information that has with digital document, and for the digital document that is in specific form specify become the required satisfied answer condition of original form again and reply original form after with the configuration information of carrying;
(2) distributor provides corresponding network acquisition methods for the digital document that is in specific form;
(3) the network acquisition methods that utilizes the distributor to provide, the user obtains to be in the digital document of specific form by network;
(4) user constructs a kind of specific environment, is used to use the digital document that is in specific form;
(5) by specific environment the digital document that is in specific form is replied conditional test, the digital document that only is in specific form under the situation that the answer condition is set up could be replied and is original form, will be arranged in specific environment and reply to the digital document after original form;
(6) the file access interface that utilizes specific environment and provided, the content of the addressable digital document of application program.
2. specific form described in claim 1, its feature comprises: application program can't utilize the file access interface to obtain the former meaningful of digital document.
3. answer condition described in claim 1, its feature comprises: when replying conditional test, two identical files of conversion identification information are considered to same file.
4. as answer condition as described in the claim a kind, its feature comprises: the answer condition associated with digital document that is in special state is identical in whole network range.
5. change identification information described in claim 1, its feature comprises: can be a symbol string, also can be made up of jointly a plurality of symbol strings.
6. specific environment described in claim 1, its feature comprises: specific environment comprises to be provided file storage service and supports the memory cell of file access interface and the Add-ons unit of other functions is provided.
7. configuration information described in claim 1, its feature comprises: contain the configuration information that is associated with the access visit Control work.
8. memory cell described in claim 6, its feature comprises: be provided with according to the association of file copy operation and move operation at file are managed.
9. memory cell described in claim 6, its feature comprises: come the program of access file content is tested according to the association setting of file.
10. other functions described in claim 6, its feature comprises: the digital document that will be in specific form becomes the digital document that is positioned within the memory cell and is in original form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102095861A CN102055781A (en) | 2009-10-30 | 2009-10-30 | Digital file distribution method based on network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102095861A CN102055781A (en) | 2009-10-30 | 2009-10-30 | Digital file distribution method based on network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102055781A true CN102055781A (en) | 2011-05-11 |
Family
ID=43959706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102095861A Pending CN102055781A (en) | 2009-10-30 | 2009-10-30 | Digital file distribution method based on network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102055781A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783102A (en) * | 1999-03-17 | 2006-06-07 | Lg电子株式会社 | Method and device for copy protection |
| CN1956449A (en) * | 2005-10-28 | 2007-05-02 | 北京书生数字技术有限公司 | Encipher transmission method and equipment system for preventing cpying data resource |
-
2009
- 2009-10-30 CN CN2009102095861A patent/CN102055781A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783102A (en) * | 1999-03-17 | 2006-06-07 | Lg电子株式会社 | Method and device for copy protection |
| CN1956449A (en) * | 2005-10-28 | 2007-05-02 | 北京书生数字技术有限公司 | Encipher transmission method and equipment system for preventing cpying data resource |
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Application publication date: 20110511 |