IMHO, Lifelock and other such operations are very dubious. See this story:
http://www.phoenixnewtimes.com/2007-...ened-in-vegas/
and do a search for lifelock and scam before you sign up.
Also an interesting story in the Dallas Morning News.
http://www.dallasnews.com/sharedcont...i.2de6b4f.html