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On Usenet, the Usenet Death Penalty (or UDP) is a final penalty that may be issued against Internet service providers or single users who produce too much spam or fail to adhere to Usenet standards. Messages that fall under the jurisdiction of a Usenet Death Penalty will be cancelled. Cancelled messages are deleted from Usenet servers and not allowed to propagate. This causes users on the affected ISP to be unable to post to Usenet, and it puts pressure on the ISP to change their policies. Notable cases include actions taken against UUNET, CompuServe, and Excite@Home. == Types == There are three types of Usenet Death Penalty: #''Active'': with an active UDP, messages that fall under the UDP will be automatically cancelled by third parties or their agents, such as by using cancelbots. #''Passive'': with a passive UDP, messages that fall under the UDP will simply be ignored and will not spread. #''Partial'': a partial UDP applies only to a certain subset of newsgroups, not the entire Usenet newsgroup hierarchy. To be effective, the UDP must be supported by a large number of servers, or the majority of the major transit servers. Otherwise, the articles will propagate throughout the smaller, slower peerings. UDPs are not casual acts. They are announced beforehand, only after the owner of the offending server has been contacted and given several chances to correct the perceived problem. Since the effects on the users of a server under a UDP can be significant, if the users want to post, the impact of a UDP can induce the operators of an offending server to address problems quickly. UDPs have been issued against America Online, BBN Planet, CompuServe, Erols Internet, Netcom, and TIAC. 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「Usenet Death Penalty」の詳細全文を読む スポンサード リンク
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