CN1812541A - Digital copyright and digital watermark protecting method for video program - Google Patents
Digital copyright and digital watermark protecting method for video program Download PDFInfo
- Publication number
- CN1812541A CN1812541A CN 200510131169 CN200510131169A CN1812541A CN 1812541 A CN1812541 A CN 1812541A CN 200510131169 CN200510131169 CN 200510131169 CN 200510131169 A CN200510131169 A CN 200510131169A CN 1812541 A CN1812541 A CN 1812541A
- Authority
- CN
- China
- Prior art keywords
- file
- user
- data
- video
- program
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Editing Of Facsimile Originals (AREA)
Abstract
A method for protecting digital copyright and watermark of video program includes decomposing video program to be two parts as one part being key data picked up from video file data, embedding watermark identifying the user in key data according to different user for realizing encipherment in one cipher for one person mode .By utilizing said method, attacker can be found out immediately according to digital watermark of the user if program is transmitted illegally at user end.
Description
1, technical field
The present invention relates to a kind of video media communications or digital television on-demand technology, specifically a kind of digital publishing rights of video frequency program and digital watermarking protection method.
2, background technology
Digital video programs far above analog program, in entertainment field widespread usage such as network video-on-demand, TVs, and is developing into high definition standard program gradually on function and effect.Video frequency program is the main resource of Virtual network operator and content supplier, and wherein the high definition program is its core resource.Because digital video has the lossless copy characteristic,, can cause the heavy losses of operator and content supplier in case reveal.Realization is the key that further expands the video entertainment service to the digital copyright protecting of video frequency program.
Realize that the more general way of Digital Media copyright management (DRM) is with close mode: a program with a content key encryption after, issue to all users; Content key is encapsulated in to play and is sent to relative users after license passport is encrypted then.Advantage with close DRM mode is: each digital media program only need once be encrypted before issue, did not need online encryption; Publisher server only need carry out simple current control; Used user uses identical encryption version, does not need between the emptying of occupying volume external memory; Be fit to form expanding system performance with the distribution of content net.Above characteristic makes this technology can support fairly large user.
But there is safety defect with close DRM protected mode, is that mainly a program adopts same key to encrypt to all users, in case be cracked at individual user's broadcast license passport, can cause this program out of control by broadcast key.More seriously lack reliably on to the tracking afterwards of attacking and guarantee: embed digital watermark was nonsensical when DRM encrypted, and the user side playout software adds digital watermarking, but can not guarantee not to be bypassed; And only need content distributed key after the success attack, do not comprise Any user information.
With respect to close DRM, single close DRM can provide higher safeguard protection.For a program, single close DRM adopts different contents encryption keys at each some broadcasting user, generates the program encryption version that has nothing in common with each other.Even indivedual versions are cracked, content key must be huge deciphering plaintext program to the content of illegal propagation, rather than as a propagating contents key with close DRM, has limited the illegal spread scope of program; When generating the ciphered program version for each user, can at first embed the sign this user digital watermarking, when program when user side is cracked and propagate, can find out the assailant.
But as the cost that improves fail safe, single close DRM is directly proportional to the requirement and the number of users of computations performance and memory space, has directly limited number of users.
3, summary of the invention
The objective of the invention is to overcome digital publishing rights and the digital watermarking protection method that the deficiencies in the prior art provide a kind of video frequency program.
The objective of the invention is for overcoming shortcoming with close DRM and single close DRM, seek a kind of new DRM method, reach the purpose of high security, low amount of calculation and lower memory space, promptly amount of calculation and memory space be far below single close DRM, and safe in close DRM, near single close DRM.
For the protection requirement of entertainment video program, only need lose enjoying value for unauthorized user.Therefore can only encrypt, not the processing audio part video section.
Present video compression all is to adopt the mode of space compression and time compression combination, and wherein the I frame adopts the space compression in the frame, and P frame and B frame all adopt space compression in interframe time compression and the frame.Each I frame and subsequent P frame, B frame constitute a positive sequence, as IBBPBBP ..., when playback, the I frame must be arranged, can reconstruct the image of subsequent P frame B frame correspondence.Therefore only need carry out DRM and encrypt, just can protect whole program the I frame.
Utilize this specific character of video frequency program, the present invention transforms the close DRM of list system, has reached goal of the invention.
The technical scheme that realizes the object of the invention is: a kind of method of in video on-demand system, carrying out DRM encryption and embed digital watermark, and its characteristics may further comprise the steps:
A, for a video frequency program, at first be decomposed into 2 files at server end, a critical data that mainly comprises as I frame etc., hereinafter referred to as the I file, another mainly comprises remaining data, as P frame, B frame and audio frequency etc., hereinafter referred to as the PB file;
B, PB file directly leave on the PB publisher server, carry out program request or download for the user;
C, I frame file generate a copy at each validated user, embed this user's of sign digital watermarking, and adopt and encrypt at this user's content key, hereinafter referred to as the EI file, leave on the EI publisher server, carry out program request or download for the user;
D, user obtain the broadcast license passport that has encapsulated at the content key of oneself, generally adopt asymmetric encryption protection;
E, user obtain the PB file from the PB publisher server, obtain the EI file that generates at this user from the EI publisher server;
F, user side player extract the data of EI file and PB file synchronously, and the content key deciphering EI file in the application plays license passport, and synthesize with the PB file forms video flowing and audio stream etc., then by the decoder playback of decoding;
G, in order further to reduce amount of calculation and memory space, in step a when the video frequency program file extracts critical data, can only extract the part critical data at interval, as extracting 1 frame to a plurality of I frames every 1, form the I file and encrypt with watermarked, remaining I frame and P frame, B frame and audio-frequency unit constitute the PB file.
Wherein the described file of step a decomposes and will embed synchronous mark respectively in I file and PB file, is used for can accurately locating when playback, so that carry out synchronously with synthetic.For the ease of carrying out program request or the multicast based on stream, the original I frame position embedding synchronous mark at the PB file indicates the position attribution of this I frame in the I file, replenishes length simultaneously in the back, and is isometric with these original I frame data.
Wherein the described PB publisher server of step b can be FTP or HTTP file download service device, also can be streaming on demand server or stream multicast server, also can also utilize the P2P agreement to distribute by media distribution such as CDs.
Wherein the described processing procedure of step c can be supported various encryptions and digital watermarking algorithm.
Wherein the described I publisher server of step c can be FTP or HTTP file download service device, or the streaming on demand server through transforming, and for fail safe, these servers should possess the subscriber authentication function.Download Server can possess the breakpoint transmission function, can only obtain the content of corresponding I frame in the EI file according to synchronous requirement when making the online appreciation of user, reduces to postpone, and alleviates the impact to network, is dragging when playing and can react faster.The EI file also can send the EI file to user by modes such as document copying or mails.
Wherein the described broadcast license passport of steps d can adopt asymmetric encryption, with the fail safe of the content key of encapsulation inside the raising.Private key for user is encrypting storing in the DRM of user side player software assembly.
Wherein the described PB of obtaining file of step e and EI file might not need all to get access to this locality, can only obtain the content of current broadcast according to playing progress rate.
Wherein the described decrypting process of step f is by the content key in the DRM assembly extraction broadcast license passport of player, the EI file content is deciphered, various keys and decryption oprerations be all in the DRM component internal, and merge with PB document flow, generates content and directly be sent to decoder.Whole process has been avoided key and deciphering leakage expressly.When not having legal broadcast licence, the user is merely able to playback and goes out audio-frequency information, is merely able to obtain the residual information of image by the PB file, does not appreciate meaning.
Wherein critical data is extracted at the described interval of step g, can require to determine gap size according to protection.As per 3 seconds be the video frequency program of a frame sequence, 1 the I frame in every interval extracts a critical data and protects, the every broadcast of video will be interrupted 3 seconds in 3 seconds when unauthorized user is play, and can lose its enjoying value equally.
Because the present invention has adopted critical data and other data to carry out the mode of separating treatment, only the I frame is partly carried out at individual consumer's encryption and watermarked operation, utilize the characteristic of video compression, do not had appreciating, kept close fail safe with single close DRM for unauthorized user.Because the I file only accounts for the very little part of program file, reduce significantly at each user's amount of calculation, under a large number of users situation, the requirement of storage is descended significantly than single close DRM.
4, description of drawings
Fig. 1 decomposes, adds the treatment step schematic diagram of watermark at user side for the video frequency program file;
When Fig. 2 is the user side player plays to the treatment step schematic diagram of PB file and EI file.
Embodiment: with a playback rate is that 8Mbps, time span are that 100 minutes, file size are that the MPEG-4 HD video program of 5GB is an example, frame rate is 30fps, constituted a frame sequence in average per 5 seconds, structure is IBBPBBPBBP ..., then the frame number ratio of whole program is S
I: S
P: S
B=1: 50: 100, single frames data volume ratio was L
I: L
P: L
B=1: 0.3: 0.15, then to account for the ratio of whole file be R to the byte number of various frames
I: R
P: R
B=3.2%: 48.4%: the 48.4%PB file is 5GB, and each EI file is 160MB.Therefore with respect to single close DRM, encryption quanta has reduced about 30 times, under sizable concurrent user's situation, can be implemented in line and encrypts; When number of users was n, memory space was 5GB+n*160MB.Further adopt at interval and extract the I frame, amount of calculation and memory space will further reduce.
Implementation step is as follows:
1, digital video file is decomposed, form the I file comprise critical data, the PB file that constitutes as I frame etc. and remaining data, as comprise data such as P frame, B frame and audio frequency;
2, the PB file leaves the PB publisher server in and issues to whole users;
3, permit server is formulated the content key and the user ID of this program for each authorized user, and content key is encapsulated in to play in the license passport sends to the user;
4, user ID and the content key that utilizes permit server to provide carries out embed digital watermark and cryptographic operation to the I file, generates the EI file at this user;
5, the EI file that generates for different user is kept on the EI publisher server, for the authorized user visit;
6, the user obtains the PB file from the PB publisher server under the situation of holding legal broadcast license passport, obtains corresponding oneself EI file from the EI publisher server, just can play.
The advantage of method of the present invention is: to have inherited single close DRM safe and can trace the assailant afterwards Advantage, and the amount of calculation that adds watermark and encryption is far below single close DRM, the memory space of definitive document is also far below list Close DRM. Even indivedual versions are cracked, content key must be that huge deciphering is bright to illegal Content Restriction The literary composition program, rather than as a propagating contents key with close DRM, limited the illegal spread scope of program; When generating the ciphered program version for each user, can at first embed this user's of sign digital watermarking, when Program can be found out the assailant when user side is cracked and propagate. Thereby has a valency of well applying Value.
Claims (2)
1, a kind of digital publishing rights of video frequency program and digital watermarking protection method; it is characterized in that: the video frequency program file is decomposed into two parts; part is to the effect that from the critical data of video file extracting data; as I frame data etc.; this part data pin generates a copy to each user; embed this user's of sign digital watermarking, and adopt and encrypt at this user's content key, method may further comprise the steps:
A, for a video frequency program, at first be decomposed into 2 files, file comprises the critical data as I frame etc., hereinafter referred to as the I file, the to the effect that remaining video file data of another file comprise other data such as P frame, B frame and audio frequency, hereinafter referred to as the PB file;
B, PB file directly leave on the PB publisher server, carry out program request or download for the user;
C, at each user, the I file is embedded this user's of sign digital watermarking, and adopts and encrypt at the key of this user content, generation is at this user's encryption version, hereinafter referred to as the EI file, leave on the EI publisher server, carry out program request or download for this user;
D, user obtain the encryption broadcast license passport that has encapsulated at the content key of oneself;
E, user obtain unified plaintext PB file from the PB publisher server, obtain the EI file that generates at this user from the EI publisher server;
The player of f, user side obtain respectively encryption the EI file critical data and expressly behind the PB file data, at first carry out synchronously, content key deciphering in the application plays license passport, and it is synthetic with the PB document data flow, the decrypted key data synthesize video flowing and audio stream then, carry out the audio frequency and video playback after being decoded by decoder again.
G, in order further to reduce amount of calculation and memory space, when video frequency program being decomposed into I file and PB file, extract the part critical data at interval, as extracting 1 I frame data to a plurality of I frames every 1, form the I file, remaining data constitute the PB file, and the I file is carried out the described watermarked and encryption of step c obtain the EI file.
2, the digital publishing rights of video frequency program according to claim 1 and digital watermarking protection method; it is characterized in that; the difference published method of the encrypted content of video program content and clear content; be that each user passes through to share cover PB file expressly, each user obtains the encryption key data version of correspondence oneself respectively by program request or download.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101311691A CN100442835C (en) | 2005-12-27 | 2005-12-27 | Digital copyright and digital watermark protecting method for video program |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101311691A CN100442835C (en) | 2005-12-27 | 2005-12-27 | Digital copyright and digital watermark protecting method for video program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1812541A true CN1812541A (en) | 2006-08-02 |
| CN100442835C CN100442835C (en) | 2008-12-10 |
Family
ID=36845172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101311691A Expired - Fee Related CN100442835C (en) | 2005-12-27 | 2005-12-27 | Digital copyright and digital watermark protecting method for video program |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100442835C (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399961B (en) * | 2007-09-28 | 2010-10-20 | 北京视博数字电视科技有限公司 | Digital fingerprint embedding method, digital video distributing system and method |
| CN101894575A (en) * | 2009-04-30 | 2010-11-24 | 霍尼韦尔国际公司 | Be used for the multi dvr video encapsulation of incident forensics |
| CN101399962B (en) * | 2007-09-28 | 2010-12-01 | 北京视博数字电视科技有限公司 | Digital video distributing system and method |
| CN102164303A (en) * | 2010-02-24 | 2011-08-24 | 中兴通讯股份有限公司 | Video copyright protection method and system as well as video publisher entity |
| CN101466021B (en) * | 2007-12-17 | 2012-05-30 | 美国博通公司 | Video processing system and method |
| CN103379365A (en) * | 2012-04-27 | 2013-10-30 | 日立(中国)研究开发有限公司 | Content acquiring device and method and content and multimedia issuing systems |
| CN103747279A (en) * | 2013-11-18 | 2014-04-23 | 南京邮电大学 | Cloud storage and sharing coded video encryption and access control strategy updating method |
| CN106604275A (en) * | 2017-01-22 | 2017-04-26 | 武汉慧通云信息科技有限公司 | Information transmission, encryption and decryption method and system based on mobile internet |
| CN107995525A (en) * | 2017-11-27 | 2018-05-04 | 合肥亚慕信息科技有限公司 | One kind encrypts online video watermark analysis process system based on safety |
| CN108108632A (en) * | 2017-11-30 | 2018-06-01 | 中车青岛四方机车车辆股份有限公司 | A kind of multifactor file watermark generation extracting method and system |
| CN108289254A (en) * | 2018-01-30 | 2018-07-17 | 北京小米移动软件有限公司 | Web conference information processing method and device |
| CN108810570A (en) * | 2018-06-08 | 2018-11-13 | 安磊 | Artificial intelligence video gene encryption method, device and equipment |
| CN109583218A (en) * | 2018-11-23 | 2019-04-05 | 泰康保险集团股份有限公司 | Classified papers protection, localization method, device, equipment and readable storage medium storing program for executing |
| CN110073357A (en) * | 2017-01-02 | 2019-07-30 | 西部数据技术公司 | Decryption and variant processing |
| CN110719527A (en) * | 2019-09-30 | 2020-01-21 | 维沃移动通信有限公司 | Video processing method, electronic equipment and mobile terminal |
| CN115225977A (en) * | 2022-06-29 | 2022-10-21 | 浪潮云信息技术股份公司 | Video sparse asymmetric encryption method |
| CN117272253A (en) * | 2023-11-23 | 2023-12-22 | 北京知呱呱科技有限公司 | Method for embedding and detecting digital watermark in large language model generated text |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2464105A1 (en) * | 2010-12-07 | 2012-06-13 | British Telecommunications Public Limited Company | Method and system for data management |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002017637A1 (en) * | 2000-08-25 | 2002-02-28 | Matsushita Electric Industrial Co., Ltd. | Data transmission method and data relay method |
| CN1613228A (en) * | 2002-01-11 | 2005-05-04 | 皇家飞利浦电子股份有限公司 | Generation of a watermark being unique to a receiver of a multicast transmission of multimedia |
| US7313814B2 (en) * | 2003-04-01 | 2007-12-25 | Microsoft Corporation | Scalable, error resilient DRM for scalable media |
| CN100576911C (en) * | 2003-10-14 | 2009-12-30 | 松下电器产业株式会社 | The MPEG-21 digital content protective system |
-
2005
- 2005-12-27 CN CNB2005101311691A patent/CN100442835C/en not_active Expired - Fee Related
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399961B (en) * | 2007-09-28 | 2010-10-20 | 北京视博数字电视科技有限公司 | Digital fingerprint embedding method, digital video distributing system and method |
| CN101399962B (en) * | 2007-09-28 | 2010-12-01 | 北京视博数字电视科技有限公司 | Digital video distributing system and method |
| CN101466021B (en) * | 2007-12-17 | 2012-05-30 | 美国博通公司 | Video processing system and method |
| CN101894575A (en) * | 2009-04-30 | 2010-11-24 | 霍尼韦尔国际公司 | Be used for the multi dvr video encapsulation of incident forensics |
| CN101894575B (en) * | 2009-04-30 | 2015-03-25 | 霍尼韦尔国际公司 | Multi DVR video packaging for incident forensics |
| CN102164303A (en) * | 2010-02-24 | 2011-08-24 | 中兴通讯股份有限公司 | Video copyright protection method and system as well as video publisher entity |
| CN102164303B (en) * | 2010-02-24 | 2016-06-22 | 中兴通讯股份有限公司 | Video copyright protecting method, system and video distribution side's entity |
| CN103379365A (en) * | 2012-04-27 | 2013-10-30 | 日立(中国)研究开发有限公司 | Content acquiring device and method and content and multimedia issuing systems |
| CN103747279A (en) * | 2013-11-18 | 2014-04-23 | 南京邮电大学 | Cloud storage and sharing coded video encryption and access control strategy updating method |
| CN110073357A (en) * | 2017-01-02 | 2019-07-30 | 西部数据技术公司 | Decryption and variant processing |
| CN110073357B (en) * | 2017-01-02 | 2023-07-21 | 西部数据技术公司 | Decryption and variant handling |
| CN106604275B (en) * | 2017-01-22 | 2020-08-04 | 武汉慧通云信息科技有限公司 | Information transmission encryption and decryption method and system based on mobile internet |
| CN106604275A (en) * | 2017-01-22 | 2017-04-26 | 武汉慧通云信息科技有限公司 | Information transmission, encryption and decryption method and system based on mobile internet |
| CN107995525A (en) * | 2017-11-27 | 2018-05-04 | 合肥亚慕信息科技有限公司 | One kind encrypts online video watermark analysis process system based on safety |
| CN108108632A (en) * | 2017-11-30 | 2018-06-01 | 中车青岛四方机车车辆股份有限公司 | A kind of multifactor file watermark generation extracting method and system |
| CN108289254A (en) * | 2018-01-30 | 2018-07-17 | 北京小米移动软件有限公司 | Web conference information processing method and device |
| CN108810570A (en) * | 2018-06-08 | 2018-11-13 | 安磊 | Artificial intelligence video gene encryption method, device and equipment |
| CN109583218A (en) * | 2018-11-23 | 2019-04-05 | 泰康保险集团股份有限公司 | Classified papers protection, localization method, device, equipment and readable storage medium storing program for executing |
| CN110719527A (en) * | 2019-09-30 | 2020-01-21 | 维沃移动通信有限公司 | Video processing method, electronic equipment and mobile terminal |
| CN115225977A (en) * | 2022-06-29 | 2022-10-21 | 浪潮云信息技术股份公司 | Video sparse asymmetric encryption method |
| CN115225977B (en) * | 2022-06-29 | 2023-11-21 | 浪潮云信息技术股份公司 | Video sparse asymmetric encryption method |
| CN117272253A (en) * | 2023-11-23 | 2023-12-22 | 北京知呱呱科技有限公司 | Method for embedding and detecting digital watermark in large language model generated text |
| CN117272253B (en) * | 2023-11-23 | 2024-02-23 | 北京知呱呱科技有限公司 | Method for embedding and detecting digital watermark in large language model generated text |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100442835C (en) | 2008-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100442835C (en) | Digital copyright and digital watermark protecting method for video program | |
| Lin et al. | Advances in digital video content protection | |
| Lian et al. | Recent advances in multimedia information system security | |
| US9038147B2 (en) | Progressive download or streaming of digital media securely through a localized container and communication protocol proxy | |
| US20130283051A1 (en) | Persistent License for Stored Content | |
| US20100100742A1 (en) | Transport Stream Watermarking | |
| US10623409B2 (en) | Controlling access to IP streaming content | |
| CA2551083A1 (en) | Method and system for session based watermarking of encrypted content | |
| KR20080025207A (en) | Preventing illegal distribution of copy protected content | |
| US20170353745A1 (en) | Secure media player | |
| EP2272201A1 (en) | Method for preventing laundering and repackaging of multimedia content in content distribution systems | |
| CN111988640A (en) | Content copyright protection method based on original video data transformation encryption | |
| CN1694528A (en) | Method for sending digital copies of protected media and network access device | |
| US20230141582A1 (en) | Digital Watermarking in a Content Delivery Network | |
| Peinado et al. | Digital rights management for digital cinema | |
| KR100635128B1 (en) | Apparatus for generating encrypted motion-picture file with iso base media format and apparatus for reconstructing encrypted motion-picture, and method for reconstructing the same | |
| Ridzoň et al. | Multimedia security and multimedia content protection | |
| KR100434252B1 (en) | Apparatus for generating and inserting watermark, and extracting digital contents and watermark | |
| Wyseur et al. | On the design of a secure multimedia archive | |
| Kwon | Digital Rights Management of A/V Codec for Mobile Devices | |
| Kundur et al. | Security and digital rights management for mobile content | |
| Jie et al. | A protection scheme based on online encryption for streaming media | |
| Kwon | Contents Protection for Media Streaming Service | |
| Lee et al. | Implementation of Selective Real-Time Encryption for Copyright Protection of H. 264 Contents | |
| Goyal et al. | Comparative Study of Spatial Watermarking of Various Video formats |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081210 Termination date: 20161227 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |