We argue that the core problem facing peer-to-peer systems is locating documents in a decentralized network and propose Chord, a distributed lookup primitive. Chord provides an efficient method of locating documents while placing few constraints on the applications that use it. As proof that Chord’s functionality is useful in the development of peer-to-peer applications, we outline the implemen...

Many Internet applications are used to access resources, such as pieces of information or server processes that are available in several equivalent replicas on different hosts. This includes, but is not limited to, peer-to-peer file sharing applications. The goal of Application-Layer Traffic Optimization (ALTO) is to provide guidance to applications that have to select one or several hosts from...

We have implemented a small-scale peer-to-peer based environment called Comtella, which allows faculty, graduate and undergraduate students to contribute and share URLs of class-related resources, like academic and popular articles. The system has been deployed for three months in a university course on ethics and information technology with thirty five undergraduate students. We deployed two m...

We present a model of bandwidth allocation in a stylized peer-to-peer file sharing network. Given an arbitrary population of peers composed of sharers and freeriders, where all peers interconnect to maximize their allocated bandwidth, we derive the expected bandwidth obtained by sharers and freeriders. We show that sharers are always better off than freeriders and that the difference decreases ...

D distribution channels raise many new challenges for managers in the media industry. This is particularly true for movie studios where high-value content can be stolen and released through illegitimate digital channels, even prior to the release of the movie in legal channels. In response to this potential threat, movie studios have spent millions of dollars to protect their content from unaut...

Using a data set including album sales, Internet penetration and various demographic measures for 99 American cities over the period 19982003 this paper empirically examines the extent to which file-sharing has caused the US decline in sound recording sales over that period. Also examined is the impact of the Internet on entertainment activities so as to help cleanse the Internet penetration co...

This work has two objectives. The first is to study rigorously the transient behavior of some P2P networks where information is replicated and disseminated according to an epidemic type dynamics. The second is to use the insight gained in order to predict how efficient are the measures taken against peer to peer networks. Two abstract models are considered to describe the P2P file sharing based...

File sharing networks are among the most popular applications of Peer-to-Peer (P2P) technology to date [3] and have been widely studied in terms of the performance, behavior, topology and other properties. A persistent theme throughout this research has been the evidence that many P2P file sharing systems rely on the presence of altruistic users, who provide files, network capacity or some othe...

This paper presents a token-based accounting mechanism that alleviates the free riding problem in P2P networks. On the basis of a P2P file sharing scenario it is shown how tokens are issued, certified and used as a payment in a secure and scalable way. The approach is complemented by distributed pricing as a flexible and viable scheme to incite users to share valuable content and to efficiently...

Sharing files discovery is a fundamental problem in P2P networking. This paper presents a name-based approach for identifying sharing file correspondences in multilingual P2P systems. The problem is first analyzed through comparing the names of the sharing files in different nodes of a real P2P community, which name those files in different languages. Then based on the relationships of those fi...