The record company-backed scheme, famous for its stark black and white CD stickers alerting people to explicit content, has not been universally adopted in the digital world despite some hysteria in the media and political arena about parental responsibility and the ease with which 12 year old girls can download expletive laden rap .

iTunes, which controls around three quarters of the digital market, has been an enthusiastic adopter by labeling many tracks by Eminem and 50 Cent as EXPLICIT. ...