[Usenet] A sanction against sites that habitually spew Usenet spam. This can be either passive or active. A passive UDP refers to the dropping of all postings by a particular domain so as to inhibit propagation. An active UDP refers to third-party cancellation of all postings by the UDPed domain. A partial UDP is one which applies only to certain newsgroups or hierarchies in Usenet. Compare Internet Death Penalty, with which this term is sometimes confused.