You understand that Time-Warner-nachos-whatever owns DC Comics and has done so for decades?
Legalese means that they still have to pay each other for work and licensing, even though ostensibly they are basically the same entity.
The reason that they would have shopped it out first would have probably been that paying themselves for the benefit of using their own character is less profitable than finding some mule to do all the hard work for them.
Interesting. I've only been following Network Television for a couple years now and I assumed that Warner Brothers/DC characters could appear on the WB.