About: File-sharing software and P2P Networks




File-sharing software is used to directly or indirectly transfer files from one computer to another over the Internet, over a smaller Intranet, or across simple networks following the peer-to-peer (P2P) model.

File-sharing programs. A variety of file-sharing programs is available on several different networks. Availability depends partly on operating system, and different networks have different features (for example, multiple-source downloads, different sorts of search limiting, and so on). It is common for commercial file sharing clients to contain abrasive advertising software, or spyware.

File-sharing dynamics There are several major topics surrounding file sharing. Of them, the two primary dynamics are the benefits and drawbacks of Centralization vs Decentralization and Privacy / Anonymity, especially vs copyright protection and file-sharing legality. As well as the problem of spyware, a method for the companies that produce peer-to-peer programs to make money on their product. It is these pulls which have defined several themes of software. In the early days, client software was protocol-specific, so you had "Napster" clients, and you had "Gnutella" clients. There is an everpresent push towards making the GUI-side of things capable of using multiple protocols. After all, why should a user have to load up several different applications to do what is, in their mind, the same thing? In cases where there is perceived value in collecting, some people will have lots to share and will find themselves surrounded by eager people. This can cause problems when the collector cannot keep up with demand. Decentralization is one means to alleviate this problem, especially in cases where it is possible to ensure that multiple copies of a popular item are available from multiple sources (even simultaneously, as with multi-source downloading). Concepts like hoarding come about where the one centralized person will collect and will not later freely give away what was given. Barter and ratio systems evolve in order to reduce the impact of hoarding. Under these systems, a person will only share when they can expect to get something in return.

Privacy issus The concept of being tagged and tracked is one which has been a reality for some time. Personally identifiable information is legally associated with a person's actions in order to verify their identity. Think credit cards: these have to be associated with the purchaser, otherwise the credit card couldn't send a bill for those purchases. This concept has also entered into the computer world, and many people are fearful of advertisers tracking their virtual "movements". While advertisers claim that this is to target more applicable or interesting ads, many people argue that they never want to see another ad again, and certainly don't want to be tracked without explicit permission. This desire for anonymity has spilled into file sharing such that some clients have encryption and obfuscation functionality to protect their users. Concepts such as decentralization and trust have also been used as a means of hiding the identity of users.

File sharing and copyright issus Anonymous, Internet file sharing (such as Gnutella and Napster) grew in popularity with the proliferation of high speed Internet connections and the (relatively) small and high quality MP3 audio format. Although file sharing is a legal technology with legal uses, some people (in practice, the great majority of users) have used it to download copyrighted materials. This has led to counter-attacks against file sharing in general from some copyright owners. There has been a great discussion over perceived and actual legal issues surrounding file sharing. In circumstances where trading partners are in different countries with different legal codes, there are significant problems to contend with. What if a person in Canada wishes to share a piece of source code which, if compiled, has encryption capabilities? In some countries, a citizen may not request or receive such information without special permission. Throughout the past three years, the entire file-sharing community has been in a state of flux, since record companies and RIAA try to shut down as much of this as possible. Even though they have forced Napster into cooperating against copyright violations, they are way behind, since the community has flourished and produced lots of different clients, though not as many different underlying protocols. The second generation of P2P protocols, such as Freenet are not as dependent as Napster is on a central server, making it much harder to shut down these systems through court actions. Another attempt (used by the maintainers of KaZaA) is to change the company's organization so that it is impossible or useless to attack it legally. Decentralization has been widely pushed over the fear of having a centralized network attacked, either by legal disputes or hostile users. One argues that a decentralized network has no body to attack, only individual ethereal members. While the foundation protocol of the Internet TCP/IP was designed to be robust and withstand concerted attack, file-sharing and peer-to-peer systems are proving even stronger. So today we are left with a slew of clients with functionality designed around making sharing files more effective, both in the real sense of uploading and downloading (like anti-hoarding functions) and in the more ethereal sense of being bulletproof towards legal issues (as with anonymity and decentralization).

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