The five major record companies have been hit with a class-action lawsuit charging that new CDs designed to thwart Napster-style piracy are defective and should either be barred from sale or carry warning labels. The suit was brought this week in Los Angeles Superior Court by class-action specialists at the law firm Milberg, Weiss, Bershad, Hynes & Lerach on behalf of two Southern California consumers. It marks the first legal challenge of CD copy-prevention technology to "tackle the issue on an industry-wide basis," Alan Mansfield, an attorney representing the two named plaintiffs in the complaint, said Friday. It also follows...