At the risk of diluting the discussion here, do we know where they got the "TV Tuner" footage? I've been tuned to a channel with "WJLA" at the upper left (I thi

At the risk of diluting the discussion here, do we know where they got the "TV Tuner" footage? I've been tuned to a channel with "WJLA" at the upper left (I think, aka "ABC 7"---I don't know I'm not American) for some time now; it started with a clip that is related to the 9/11 attacks but after heaps of ads I'm now watching relatively mundane news (traffic and weather updates, anyone?). On one hand it's just impressive to me that they have this footage and it made my curiosity itch. On the other hand, a project like this can only gain from having verifiable sources. So do we know how/where they got all these footage?