Amazon struck a deal with CBS to allow online streaming of the upcoming summer series Under The Dome, from Steven Spielberg and Stephen King, just 4 days after the initial airing on CBS. Amazon Prime members exclusively will be able to stream the show an unlimited number of times.
Why four days? Because currently networks sell commercial slots to advertisers based on the “C3” rating – which counts the number of viewers who watch the commercials played during the broadcast, both live and time-shifted up to three days. After the third day it doesn’t matter much to the network, so this is likely the soonest you’ll see digital distribution done by anyone other than the broadcast network for a show.