How the assault on the Netflix will shake out: at last, big studios are making bold moves away from DVDs to the bright digital future, and friending Facebook--but can they stem the rising tide of rentals with their secret weapon, UltraViolet?

IF IMITATION IS FLATTERY, THEN NETFLIX should feel rather charmed lately, because the company's aggressive push into streaming TV shows and movies over the Internet is being copied by, well, [...]