Reading between the lines, I'm guessing Yahoo really liked the SRI tech (perhaps also with some of the additions made by Summly). They wanted to exclusively loc

Reading between the lines, I'm guessing Yahoo really liked the SRI tech (perhaps also with some of the additions made by Summly). They wanted to exclusively lock it up. If Yahoo had gone just to SRI, a competitor could have bought Summly... and Summly may have had, as part of SRI's stake, a perpetual and transferable license that Yahoo didn't want falling into any other acquirer's hands.