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In computing and specifically Internet, a leech is one who benefits, usually deliberately, from others' information or effort but does not offer anything in return, or makes 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. Depending on context, leeching does not necessarily refer to ''illegal'' use of computer resources, but often instead to ''greedy'' use according to etiquette: to wit, using too much of what is freely given without contributing a reasonable amount back to the community that provides it. The name derives from the leech, an animal that sucks blood and then tries to leave unnoticed. Other terms are used, such as "freeloader" and "sponge", but leech is the most common. == Examples == * Wi-Fi leeches attach to open wireless networks without the owner's knowledge in order to access the Internet. One example of this is someone who connects to a café's free wireless service from his or her car in the parking lot in order to download large amounts of data. See Piggybacking (Internet access) * Direct linking (or hot-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) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Leech (computing)」の詳細全文を読む スポンサード リンク
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