You wouldn’t think it would be that hard for a cable provider to just put cable TV content online. Big companies like Netflix and Amazon and Hulu have made large scale video streaming work just fine.  And it’s true, the technology isn’t all that tricky -- but what is tricky is the legal and financial wrangling. A few years ago, faced with the looming presence of Netflix and other video streamers, two cable giants, Comcast and Time Warner, hatched a plan to keep customers from cutting the cable.