Sony, meanwhile, is trying to figure out how to make a variation of Digital Copy work with its PlayStation 3 and PlayStation Portable products (already the company has announced plans to offer a full PS3 game on the same disc as a movie; the first such title is due out later this year).

Sources say that, for Fox, the vast majority of movie transactions in iTunes are Digital Copy authentications, not actual electronic sales. Digital Copy usage makes sense, and we expect to see more studios take advantage of the capability on both new releases and catalog titles. And as the selection broadens, we anticipate that more consumers will take advantage--after all, no one enjoys paying twice for the same content in different forms.

--Melissa J.Perenson

Blu-ray on the PC: A Slow Start

Blu-ray Disc playback on PCs--laptops and desktops alike--seemed a no-brainer. Thanks to powerful processors plus high-resolution (even fully 1080p-capable) screens, as well as the increasing viability of using a , Blu-ray appeared destined for great things on the PC. After all, you could play a movie and burn up to 50GB of data with the technology.