基于水印技术的数字作品版权保护系统

本文基于数字水印技术提出了一种网络多媒体作品的注册和侵权收集机制,可以实现包括图像、视频和音频等网络作品的注册和非授权复制和传播行为的信息收集等功能。该机制对网络多媒体作品的版权保护具有一定的实用价值。     

Copyright Infringement and Protection in the Internet Age

In this age of increasingly complex, Internet-based technologies, it's very difficult to protect original works of authorship. This article examines the problem of copyright infringement and the copyright law's desire to balance the interests of creators with the interests of the public. The author also offers some insight in how to reduce the problem of copyright infringement.     

Copyright and the Delivery of Library Services to Distance Learners

SUMMARY

Library service for distance education necessitates knowledge of important new regulations that were enforced by recent amendments to copyright law. This article begins with an overview of the copyright law of 1976 related to nonprofit educational institutions. Then the Digital Millennium Copyright Act (DMCA) of 1998 and the Technology, Education and Copyright Harmonization Act (TEACH Act) of 2002 are discussed. These acts, which amended the Copyright Act of 1976, require more rigorous measures by nonprofit educational institutions to ensure compliance. The article concludes with how to avoid copyright infringement and the necessity to educate library personnel about copyright law.     

网络广播侵权行为的分析与防范

由于网络传播技术的飞速发展,借助网络进行的广播已悄然出现。对于这种非交互式网络广播中侵犯著作权的行为,我国现行《著作权法》中关于信息网络传播权或广播权的规定都不能很好地应对,目前只能通过《著作权法》的兜底条款对权益人进行保护。经过比较法的分析,本文提出通过修改《著作权法》以扩张广播权定义的方法来规制这种网络广播行为。     

An anonymous DRM scheme for sharing multimedia files in P2P networks

Peer-to-Peer (P2P) systems enable efficient multimedia file sharing and are inherently scalable on the Internet. However, the absence of a centralized authority and a suitable Digital Right Management (DRM) mechanism prompts many securities-related challenges and discourages the widespread use of P2P networks for distributing copyright-protected multimedia files. To address these issues, we adopt the concept of a group Diffie-Hellman group key and threshold scheme to propose a novel anonymous DRM scheme for P2P users that wish to share multimedia files. Our scheme has four features: (1) the P2P users remain anonymous while sharing their files, (2) no online server is needed to perform the DRM operations, (3) an adjustable mechanism exists for efficiently distributing multimedia files with different popularities, and (4) users enjoy low communication and computation costs. In addition to explaining the operations of this scheme, we also compare its performance and security with Zhang et al.’s design, TLMS and Lua’s Scheme within the context of this study.     

Procedure guidance for Internet forensics coping with copyright arguments of client-server-based P2P models

Digital technology for transferring and controlling data has made substantial advances in recent years. It is important to protect innovations and to curb the copyright infringements in computer-based systems. Copyright is a legal framework of basic rights, allowing the owner to control or permit someone else to reproduce copyrighted works with commercial value. In recent decades, copyright violations have been moving into the criminal realm. This paper focuses on the procedure guidance of a fictitious P2P model, and discusses whether it contributes to the crime of copyright infringement in dealing with the distribution of digital content. From the perspective of internet forensics, the action research and the whole control mechanism, it is shown that a commercial server has full control over the P2P model.     

基于DRM的版权管理系统的研究与设计

网络的普及使得大量用户开始使用互联网进行资源共享,网络资源的版权管理混乱。为了解决共享资源引发的版权问题,介绍了版权控制的概念及其应用背景和相关研究工作,分析包含内容服务和许可服务的DRM（Digital Copyright Management,数字版权管理）结构模型,研究关键技术问题,提出了一个基于P2P结构的版权控制应用模型,并通过原型实验系统,验证了该应用模型具有较好的可操作性和稳定性。     

对等网络拓扑测量与特征分析

测量分析对等网络(peer-to-peer networks)拓扑特征是解决P2P优化、网络监管等问题的基础.对等网络是一类大规模、自组织、并且高度动态的复杂网络系统,准确、完整地测量所有对等网络拓扑面临很大困难.研究对等网络的协议特点,分析特定P2P拓扑实例成为认识P2P拓扑特性的一种可选研究方案.以Gnutella网络为测量对象,定义了对等网络拓扑测量系统准确性、完整性的衡量指标,设计、实现了基于正反馈的分布式Gnutella拓扑爬行器——D-Crawler;分析了Gnutella网络拓扑图的度等级分布特征、度频率分布特征以及小世界特性.实验和分析结果表明,对等网络拓扑图属性特征与其使用的协议和客户端软件行为密切相关;Gnutella网络中不同层次的节点之间的拓扑关系表现出不同的特性:上层节点组成的子图具有度等级幂律特征,但在其度频率分布上却呈现出正态分布的特性;下层节点在度等级分布上的幂律特征表现不强烈,而在其度频率分布特征上具有明显的幂律特性.拟合结果表明:幂律能够较好地拟合度等级分布和下层节点度频率分布,然而对于上层节点度概率密度分布,Gaussian拟合效果最好.Gnutella网络具有小世界特性,即:较大的聚集系数和较小的特征路径长度,但它不是无尺度图,不符合BA(Barabási-Albert)生长模型,其发展遵循一种不同于BA模型的生长过程.     

关于微博法律问题的思考

本文试图通过介绍目前微博版权被侵犯的现实,分析发生侵权现象的原因,并引入法律在其中应起的作用,最后针对问题提出避免微博版权侵权的建议。     

利用综合特征提取的数字图像版权保护算法

为了有效地保护和验证数字媒体作品的版权信息,提出一种区别于传统嵌入式鲁棒水印的数字水印算法.算法中所提取的特征是由区域亮度和纹理特性所组成的综合特征,其中亮度特征的提取利用了扩展盒中脑神经网络(gBSB)的聚类功能,对于区域的纹理特征,则是通过分析其直方图统计矩来提取的.仿真结果表明,该水印方案对于常规的信号处理及几何变换攻击具有良好的鲁棒性,是一种实用的、有效的数字图像版权保护水印算法.     

Enabling adaptive live streaming in P2P multipath networks

Live Internet streaming can be regarded as a major current multimedia delivery mode. Efficient delivery under changing network conditions is a severe challenge in the design of live streaming systems. This study analyzes the key considerations and factors influencing live stream quality during system operations, and attempts to improve present P2P (peer-to-peer) live streaming systems by allowing users to enjoy high quality of service under the limitations of network resources. The proposed R-D (Rate-Distortion) optimized-dynamic-nodes-join algorithm is based on multipath streaming concept and receiver-driven approach. This distributed algorithm enables the system to evaluate the current network status in order to optimize the end-to-end distortion of P2P networks and stay in the optimal status. Experiment results of this study demonstrate the effectiveness of the proposed approach.     

Copyright reform step zero

‘A reasonable person might well think it's a fool's errand to contemplate a [copyright] reform project of any sort.’ The US Copyright Act of 1976 and its subsequent amendments is contained in over 200 pages of incomprehensible, sometimes inconsistent, and highly technical provisions. Attempts to reform this law are doomed from the start. They are doomed not because they lack merit, but because of the way copyright law is made. This article argues that before any meaningful copyright reform is passed, the institutional framework that makes copyright law must be changed. It proposes delegating substantive rulemaking authority to the US Copyright Office as part of that change. The article explores the benefits and drawbacks to this approach and concludes that without the type of institutional reform envisioned by this proposal, copyright law will continue to become increasingly unable to keep up with technological and other challenges while also becoming increasingly resistant to reform efforts.     

基于混合P2P技术的远程教学系统的设计

传统的多媒体远程教学系统中,教学资源大多存放在中心服务器上,各分散学习点需要从服务器下载资源,服务器的性能及网络带宽将直接影响教学活动。将混合P2P技术引入多媒体网络教学中,会对多媒体的远程教育进行优化。本文设计一个基于混合P2P技术的远程教学系统,主要利用混合型P2P模型来实现视频点播和文件共享功能。     

浅析数字内容的版权保护与建议

数字技术的迅速发展和广泛应用,互联网、电信移动网络等新兴传输方式和手机、机顶盒、电脑等多媒体终端极大地拓展了数字内容的传输范围。数字内容版权保护的问题日益突出,本文从立法和技术角度阐释了数字内容的版权保护,并提出了数字内容版权保护的建议。     

On index load balancing in scalable P2P media distribution

Peer-Peer (P2P) technologies have recently been in the limelight for their disruptive power in particular they have emerged as a powerful multimedia content distribution mechanism. However, the widespread deployment of P2P networks are hindered by several issues, especially the ones that influence end-user satisfaction, including reliability. In this paper, we propose a solution for an efficient and user-oriented keyword lookup service on P2P networks. The proposed mechanism has been designed to achieve reliability via index load balancing and address the scalability issues of extremely popular keywords in the index. The system performance have been analytically derived as well implemented using the OpenDHT framework on PlanetLab.

基于P2P网络直播流媒体水印技术研究

为了解决现有的对等网络(P2P)流媒体直播方案中数字媒体的版权保护问题,研究了基于P2P网络流媒体的水印技术.数字水印技术(Digital Watermarking)是在不影响原始数据正常使用的情况下嵌入版权信息,并且该信息不易被除去,只有专用的水印提取算法才能检测其中的信息.在分析现有流媒体水印算法的基础上,针对适合...     

An OS-ELM based distributed ensemble classification framework in P2P networks

Although classification in centralized environments has been widely studied in recent years, it is still an important research problem for classification in P2P networks due to the popularity of P2P computing environments. The main target of classification in P2P networks is how to efficiently decrease prediction error with small network overhead. In this paper, we propose an OS-ELM based ensemble classification framework for distributed classification in a hierarchical P2P network. In the framework, we apply the incremental learning principle of OS-ELM to the hierarchical P2P network to generate an ensemble classifier. There are two kinds of implementation methods of the ensemble classifier in the P2P network, one-by-one ensemble classification and parallel ensemble classification. Furthermore, we propose a data space coverage based peer selection approach to reduce high the communication cost and large delay. We also design a two-layer index structure to efficiently support peer selection. A peer creates a local Quad-tree to index its local data and a super-peer creates a global Quad-tree to summarize its local indexes. Extensive experimental studies verify the efficiency and effectiveness of the proposed algorithms.     

结构化P2P网络可用性增强问题研究

结构化的P2P网络路由效率的低效性和P2P网络中节点自私行为导致可用资源的变数是影响结构化P2P网络可用性的两大主要问题。文中提出了一种典型的结构化P2P网络资源共享平台实现框架的模块划分图,并指出了可用性增强问题在框架图中的位置和接口。论述了这两类问题的当前研究进展,从适应网络自组织管理模式以及适应规模可缩放性这两个角度分析并评述了已有的增强结构化P2P网络可用性的诸多解决方案。最后针对当前结构化P2P网络可用性增强问题研究中的不足,给出了一些研究思路,这些将对推动结构化P2P网络技术的实用化进程提供有益的参考。     

面向IPv6的P2P流量管理机制研究

互联网正朝着IPv6的方向发展,P2P应用将是推动IPv6产业化的重要力量,但P2P业务在推动Internet宽带化的同时也带来了因资源过度占用而引起的网络拥塞问题和安全隐患.介绍了对等网络的基本概念,讨论了IPv6对P2P的支持功能,总结了应用于IPv6环境的P2P流量识别策略,设计了支持P2P流量识别的IPv6流标签和跳到跳选项,提出了面向IPv6的P2P流量管理模型,并分析了模型的功能组成及工作机制.