CN102685592A - Streaming media player method supporting digital rights management - Google Patents
Streaming media player method supporting digital rights management Download PDFInfo
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- CN102685592A CN102685592A CN2012100369318A CN201210036931A CN102685592A CN 102685592 A CN102685592 A CN 102685592A CN 2012100369318 A CN2012100369318 A CN 2012100369318A CN 201210036931 A CN201210036931 A CN 201210036931A CN 102685592 A CN102685592 A CN 102685592A
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Abstract
The invention relates to a streaming media player method supporting digital rights management, belonging to the technical field of computer multimedia.. The method is mainly implemented by virtue of a streaming media rights management module and a streaming media decoding and playing module and the like. Key technologies of certificate acquisition, certificate decryption, media decryption, certificate updating, synchronous data reading, decoding playing and the like in the streaming media player method are explained in detail. The streaming media player method has the advantages of being flexible, easy to expand, convenient to realize and high in safety property.
Description
Technical field
The present invention is a kind of DST PLAYER method of supporting digital copyright protecting.Be mainly used in the copyright protection that solves streaming medium content in the network, belong to technical field of computer multimedia.
Background technology
Streaming Media (Streaming Media); Refer to the continuous time-base media that in network, uses the stream transmission technology; Under the stream media technology support; Be put into continuous image and acoustic information on the webserver through after the processed compressed, watch, listen to, and need not wait until the multimedia file that whole multimedia file download completion just can be watched immediately while let the viewer download.
Compare conventional download and obtain the multimedia messages mode, stream media technology has been saved user's hard drive space on the one hand and has been downloaded the stand-by period, has remedied the shortcoming that the conventional download mode can't provide digital copyright protecting on the other hand.Therefore, the development of stream media technology has brought deep change to network, and huge market potential is arranged.
But; Along with the development of diverse network technology, the duplicating of content of multimedia, revise, illegal act such as propagation becomes simple day by day, pirate phenomenon emerges in an endless stream; Bring economic loss for the related right people, dampened the enthusiasm that they activate business and create on the certain degree.
Summary of the invention
Technical problem:The objective of the invention is to overcome the weak point of prior art; A kind of DST PLAYER method of supporting digital copyright protecting is proposed; Thereby the phenomenon of containing current various bootlegging, modification, propagation streaming medium content to a certain extent; With protection copyright holder's interests, promote the sound development of Streaming Media industry.
Technical scheme:The objective of the invention is to propose a kind of DST PLAYER method of supporting digital copyright protecting, said method comprises two big modules such as Streaming Media copyright protection administration module and Streaming Media decodes and plays module.
This method may further comprise the steps:
A. Streaming Media copyright protection module is designed to by certificate acquisition, the certificate deciphering, and four modules such as medium deciphering and certificate update are formed, and Streaming Media decodes and plays module makes up through the filter chart manager that the DirectShow architecture provides;
B. player judges at first whether files in stream media receives copyright protection, directly calls Streaming Media decodes and plays module decodes and plays for the files in stream media that does not receive copyright protection;
C. for the files in stream media that receives copyright protection, player is opened the digital copyright protecting functions of modules;
D. under the prerequisite of communication security, the broadcast license passport concrete steps that player obtains files in stream media comprise:
A). player is checked the broadcast license passport that whether has this files in stream media from this locality, judge further then whether broadcasting time information is effective in the certificate;
B) if. play that license passport does not exist or invalid, player expects that with users such as file header and user expectation broadcasting times information on services broadcasts to certificate server;
C). player obtains the broadcast license passport that certificate server is provided.
E. player obtains and plays after the license passport, and cert is deciphered, and carries out the confidentiality and integrity checking, and concrete steps are:
A). player carries out signature authentication based on public key algorithm to license passport, and whether inspection certificate is distorted;
B). player obtains the Streaming Media decruption key based on private key deciphering broadcast licence.
F. player uses Streaming Media decruption key deciphering files in stream media.Player utilizes double buffering technology to realize reading of data, adopts aes algorithm deciphering files in stream media, realizes playing while deciphering;
G. after player plays finishes, play in the licence key message such as broadcasting time and will upgrade in time and carry out safe storage.
In steps A; Decoder module is based on DirectShow media application development technique; Through Filter module construction FilterGraphManager, wherein use the decoder of decoder software ffdshow as audio frequency and video, Source filter is operated under the pull-mode (push model).Concrete decoding step is following:
A. player reads in buffering area with media file;
B. adopt double buffering technology, data sync is read SourceFilter;
C. in SourceFilter, read after a certain amount of data; The InputPin of SpliterFilter and the OutPin of SourceFilter connect; The data that receive are carried out the separation of audio frequency and video; Be transferred to respectively through its OutPin among the InputPin of decoding filter, audio/video decoding filter is decoded to audio/video stream respectively;
D. decoded data are delivered to video card harmony through RendererFilter and stick into capable displaying the play.
In step B; Judge whether files in stream media receives the concrete grammar of copyright protection to do, the user clicks the program that need watch, the file header of player program downloading from the streaming media server; Resolve the program file head, whether viewing files has the copyright protection attribute from file header information then;
In step D; Communication security specifically is meant the communication security between player and the certificate issued center; Through between player and certificate issued center, setting up the safe communication link, thereby guarantee the confidentiality and integrity that player is communicated by letter with the certificate issued center;
In step F, broadcast is specially the encryption stream media file data that player reads regular length at every turn while deciphering, and then to its deciphering and broadcast, judges then whether files in stream media finishes, if do not have, then repeats above-mentioned steps always;
In step G, information will be carried out safe storage, and the concrete measure of safe storage comprises: enciphered data, guarantee storage safety, player increase the fail safe of anti-tracking technology raising player self etc.
Beneficial effect:
1. the media formats of player support is many, and is convenient to the expansion of other media formats;
2. can effectively protect digital publishing rights;
3. player increases anti-tracking technology, critical data is carried out elder generation encrypts afterwards and store, and has further promoted the security performance of self;
4. method realizes that cost is little, and flexibility is high, is easy to expansion.
Description of drawings
Fig. 1 is a player logical construction sketch map.
Fig. 2 is a player certificate acquisition flow chart.
Fig. 3 is a player decrypt media document flowchart.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, key point of the present invention is made further detailed description below in conjunction with accompanying drawing.
One, player obtains the broadcast license passport
Fig. 2 has described player and has obtained the detailed process of playing license passport.The practical implementation step is following:
1. when the user need watch a program, click respective program in player end.Player is downloaded the file header of this program from the distribute media content device.Through the resolution file head, judge from the information of file header whether this media file is the file type that this player is supported, and judge further whether this document has copyright protection.If file type is not supported that player provides can't the decoding error prompting.If file does not belong to
One type of copyright protection is then directly carried out decodes and plays to media file;
2. through judging, be the media file that this player is supported, check from this locality at first the broadcast licence that whether has this document and the certificate whether key message such as broadcasting time is effective for having copyright protection and type.Have then and directly jump 5, otherwise carry out step 3.;
3. player sends to certificate server with file header, user customized service type (information such as broadcasting time) and based on the public key safety of unsymmetrical key centering.
4. the broadcast license passport made of player acceptance certificate server.If can not successfully receive, player provides can't the playback error prompting.
5. player has after the license passport, and at first the PKI cert of certificate of utility server is carried out signature authentication, verifies its integrality.Utilize the private key deciphering license passport of player then, obtain the medium decruption key.
Two, player deciphering files in stream media
Fig. 3 is that player is deciphered the detail flowchart of encryption stream media file.The player deciphering is play after the license passport, obtains the decruption key of Streaming Media.In this player, employing be that this selective encryption algorithm of RVEA is encrypted files in stream media, when guaranteeing high security, promoted efficient.
For encryption stream media file, read in the enciphered data of regular length at every turn, player utilizes decruption key that it is deciphered; Carry out decodes and plays then; After finishing playing, player judges whether file finishes, and runs through up to file otherwise repeat said process.After play finishing, key message such as broadcasting time in the player update playing licence, and encrypt update processing.
Three, the synchronous reading of data of player
Fig. 3 utilizes the double buffering formation to realize the sketch map that data read.Write a CDataAdmin class, wherein define 2 chained list: DataList and PooList.The former is used for depositing the data that read, and the latter is used for depositing idle buffering area, two shared memory headrooms of chained list.The circulating treatment procedure of data is specific as follows:
1. distribute freebuf for PooList;
2. from PooList, get freebuf and write data;
3. will read into the PooList buffering area of data puts among the DataList;
4. the data among the DataList being write Filter handles;
5. the PooList chained list is put in the data buffer zone of handling.
In this process, for the integrality that realizes data and fail safe and the consistency that reads and writes data, need carry out mutual exclusion to buffer data,, the data of buffering area do not allow other resource to operate on it when being read and write.
Four, player decodes and plays files in stream media
The multi-medium data that Source filter will obtain from buffering area is delivered to MPEG through Outpin and is decomposed converting filter.Data after MPEG decomposition converting filter will be handled deliver to video from two output needle angles respectively and audio decoder is decoded, and last two groups of data are delivered to video card harmony through representation of video shot filter, audio representation filter respectively and sticked into the row broadcast.
Claims (4)
1. DST PLAYER method of supporting digital copyright protecting, it is characterized in that: said method comprises Streaming Media copyright protection administration module and Streaming Media decodes and plays module,
This method may further comprise the steps:
A. Streaming Media copyright protection module comprises the deciphering of certificate acquisition, certificate, medium deciphering and four modules of certificate update, and Streaming Media decodes and plays module one is enclosed within the filter chart manager that the windows platform carries out kit DirectShow that Streaming Media handles and provided and makes up through what Microsoft provided;
B. player judges at first whether files in stream media receives copyright protection, directly calls Streaming Media decodes and plays module decodes and plays for the files in stream media that does not receive copyright protection;
C. for the files in stream media that receives copyright protection, player is opened the digital copyright protecting functions of modules;
D. under the prerequisite of communication security, player obtains the broadcast license passport of files in stream media, and concrete steps comprise:
A). player is checked the broadcast license passport that whether has this files in stream media from this locality, judge further then whether broadcasting time information is effective in the certificate;
B) if. play that license passport does not exist or invalid, player expects that with users such as file header and user expectation broadcasting times information on services broadcasts to certificate server;
C). player obtains the broadcast license passport that certificate server is provided;
E. player obtains and plays after the license passport, and cert is deciphered, and carries out the confidentiality and integrity checking, and concrete steps are:
A). player carries out signature authentication based on public key algorithm to license passport, and whether inspection certificate is distorted;
B). player obtains the Streaming Media decruption key based on private key deciphering broadcast licence;
F. player uses Streaming Media decruption key deciphering files in stream media, and player utilizes double buffering technology to realize reading of data, adopts Advanced Encryption Standard aes algorithm deciphering files in stream media, realizes playing while deciphering;
G. after player plays finishes, play in the licence key message such as broadcasting time and will upgrade in time and carry out safe storage;
In steps A; The Streaming Media kit DirectShow that Streaming Media decodes and plays module provides based on Microsoft; Make up filter chart manager through supply filter, converting filter and performance filter assemblies object model com object, supply filter mainly is responsible for obtaining data and data down being transmitted, and converting filter mainly is responsible for format conversion, the transmission of data; Playing up filter mainly is responsible for media data is showed to the user with different forms; Supply filter is operated under the pull-mode, uses the decoder of decoder software ffdshow as its audio frequency and video here, and concrete decoding step is following:
A. player reads in buffering area with media file;
B. adopt double buffering technology, data sync is read in the supply filter;
C. in supply filter, read after a certain amount of data; Decomposing the input pin of converting filter and the output pin of supply filter connects; The data that receive are carried out the separation of audio frequency and video; Be transferred to respectively through its output pin in the input pin of decoding filter, audio/video decoding filter is decoded to audio/video stream respectively;
D. decoded data are delivered to video card through audio/video performance filter respectively and sound card equipment displays the play;
The DST PLAYER method of support digital copyright protecting as claimed in claim 1; It is characterized in that: in step B; Judge whether files in stream media receives the concrete grammar of copyright protection to do, the user clicks the program that need watch, the file header of player program downloading from the streaming media server; Resolve the program file head, whether viewing files has the copyright protection attribute from file header information then.
2. the DST PLAYER method of support digital copyright protecting as claimed in claim 1; It is characterized in that: in step D; Communication security specifically is meant the communication security between player and the certificate issued center; Through between player and certificate issued center, setting up the safe communication link, thereby guarantee the confidentiality and integrity that player is communicated by letter with the certificate issued center.
3. the DST PLAYER method of support digital copyright protecting as claimed in claim 1; It is characterized in that: in step F; Broadcast is specially the encryption stream media file data that player reads regular length at every turn while deciphering, and then to its deciphering and broadcast, judges then whether files in stream media finishes; If no, then repeat above-mentioned steps always.
4. the DST PLAYER method of support digital copyright protecting as claimed in claim 1; It is characterized in that: in step G; Information will be carried out safe storage, and the concrete measure of safe storage comprises: enciphered data, guarantee storage safety, player increase the fail safe that anti-tracking technology improves player self.
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| CN2012100369318A CN102685592A (en) | 2012-02-17 | 2012-02-17 | Streaming media player method supporting digital rights management |
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| CN2012100369318A CN102685592A (en) | 2012-02-17 | 2012-02-17 | Streaming media player method supporting digital rights management |
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| CN103617379A (en) * | 2013-11-29 | 2014-03-05 | 乐视网信息技术（北京）股份有限公司 | Multimedia file playing method and player |
| CN103905853A (en) * | 2014-04-28 | 2014-07-02 | 尚斌 | Video player with timing code and control output and implementation method |
| CN104104676A (en) * | 2014-07-09 | 2014-10-15 | 福建星网视易信息系统有限公司 | Audio/video playing method and device |
| CN105072488A (en) * | 2015-07-20 | 2015-11-18 | 深圳Tcl数字技术有限公司 | Streaming media decryption method and device |
| CN105893856A (en) * | 2016-03-30 | 2016-08-24 | 苏州美天网络科技有限公司 | Streaming media intelligent data storage system |
| CN106792138A (en) * | 2016-12-13 | 2017-05-31 | 三星电子（中国）研发中心 | It is a kind of to realize the quick method played of DRM streams |
| WO2021248670A1 (en) * | 2020-06-11 | 2021-12-16 | 青岛海信传媒网络技术有限公司 | Safe playback method for streaming media file, and display device |
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| CN103905853A (en) * | 2014-04-28 | 2014-07-02 | 尚斌 | Video player with timing code and control output and implementation method |
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| CN104104676A (en) * | 2014-07-09 | 2014-10-15 | 福建星网视易信息系统有限公司 | Audio/video playing method and device |
| CN104104676B (en) * | 2014-07-09 | 2017-11-21 | 福建星网视易信息系统有限公司 | A kind of audio and video playing method and apparatus |
| CN105072488A (en) * | 2015-07-20 | 2015-11-18 | 深圳Tcl数字技术有限公司 | Streaming media decryption method and device |
| WO2017012419A1 (en) * | 2015-07-20 | 2017-01-26 | 深圳Tcl数字技术有限公司 | Stream media decryption method and device |
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| CN106792138A (en) * | 2016-12-13 | 2017-05-31 | 三星电子（中国）研发中心 | It is a kind of to realize the quick method played of DRM streams |
| WO2021248670A1 (en) * | 2020-06-11 | 2021-12-16 | 青岛海信传媒网络技术有限公司 | Safe playback method for streaming media file, and display device |
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Application publication date: 20120919 |