Certain record labels have been flooding online swapping services with bogus copies of popular songs. The problem has been there for a while but has mushroomed in the last 3 months. "It's more prevalent in the last three months, It's gotten real, real, real severe.'' say Streamcast Networks. Read more
http://www.siliconvalley.com/mld/siliconvalley/news/local/3560365.htm
For Kazaa you can use startfiles to help bypass such things. Read more about them on http://pub45.ezboard.com/fmorpheusfrm13.showMessage?topicID=1.topic#PBTV
also see http://www.fasttrackmovies.com/