[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.