This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (September 2007)

In computing and specifically on the Internet, being a leech or leecher refers to the practice of benefiting, usually deliberately, from others' information or effort but not offering anything in return, or only token offerings in an attempt to avoid being called a leech. In economics this type of behavior is called "Free riding" and is associated with the Free rider problem.

The name derives from the leech, an animal which sucks blood and then tries to leave unnoticed. Other terms are used, such as "freeloader", but leech is the most common.

Contents 1 Examples 2 Gaming 3 Prevention 4 BitTorrent 5 References 6 See also

[edit] Examples

• Wi-Fi leeches attach to open wireless networks without the owner's knowledge or permission in order to access the Internet. Typical examples of this might include someone who connects to a neighbor's open access point, or someone who connects to a café's free wireless service from his or her car in the parking lot. This form of leeching in particular is the subject of much legal and ethical debate.

• Direct linking is a form of bandwidth leeching that occurs when placing an unauthorized linked object, often an image, from one site in a web page belonging to a second site (the leech).

• In most P2P-networks, leeching can be defined as behavior consisting of downloading more data, over time, than the individual is uploading to other clients, thus draining speed from the network. The term is used in a similar way for shared FTP directories. Mainly, leeching is taking without giving.

• Claiming credit for, or offering for sale, freely available content created and uploaded by others to the Internet (Plagiarism/Copyfraud)

[edit] Gaming

In games (whether a traditional tabletop RPG, LARPing, or even MMORPG) the term "Leech" is given to someone who avoids confrontation and sits out while another player fights until he/she is able to "steal the kill".

• In online multi-player games, "to leech" generally means that a player be present for the presentation of a reward of some sort, without contributing to the team effort needed to earn that reward. In popular MMORPG's the alternative way to refer to a "leecher" has arisen as being "Ninja" (referring to the notional lightning reflexes needed to claim the reward between its appearance and its retrieval by the more deserving player). Most MMOs prevent this by using a "tagging" system (only the player who tags the creature/player/etc. can kill it) and by banning leeching players.
• This is different from "killstealing" where a player uses an attack at the right moment to kill an enemy and take the experience benefit (XP), which may benefit the player or not. In some games, XP is granted to the person who deals a final shot to a enemy, or to who deals a significant amount of damage regardless of who hit it last. Killstealing can in this fashion be applied as a reverse leeching: it prevents another player from gaining XP at all regardless of their effort.

[edit] Prevention

• Wi-Fi networks can implement various authentication and access control technologies in order to prevent leeching. The most common are client MAC address authorization tables, Wired Equivalent Privacy, and Wi-Fi Protected Access.
• Bandwidth leeching can be prevented by running an anti-leeching script on the website's server. It can automatically ban IPs that leech, or can redirect them to faulty files.

[edit] BitTorrent

Among users of the BitTorrent file distribution protocol, a leech is a user who disconnects as soon as he/she has a complete copy of a particular file. However, most sites prefer the term leecher for all users who are not seeders (don't have the complete file yet). However, because BitTorrent clients usually begin to upload files almost as soon as they have started to download them, such users are usually not freeloaders. Therefore this kind of leeching is considered to be a legitimate practice. Reaching an upload/download ratio of 1:1 (meaning that the user has uploaded as much as he/she has downloaded) in a BitTorrent client is considered a minimum in the etiquette of that network. A leech becomes a seeder (a provider of the file) when he or she finished downloading and continues to run the client. They will remain a seeder until the file is removed or destroyed (settings enable the torrent to stop seeding at a certain share ratio, or after X hours have passed seeding).

[edit] References

[edit] See also

• LeechModem
• Lurker
• Parasitism (social offense)