More than a third of the software installed on PCs worldwide during 2004 was pirated, with losses from unauthorized software increasing by $4 billion from 2003, according to a study released this week by the software trade group Business Software Alliance. Thirty-five percent of all software installed on PCs was pirated, down from 36 percent in 2003, according to the study, conducted by research firm IDC. Estimated losses from software piracy climbed, however, from $29 billion to $33 billion, as both the legal and unauthorized software markets grew from 2003 to 2004. IDC estimated that $90 billion worth of software...