system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How TV Networks find specific clips of things that happened decades ago?

I was just watching The Late Show with Stephen Colbert and they showed a couple of old clips with contradictory statements by Alan Dershowitz, just seconds of videos from decades ago. Everytime I see something like that I wonder: How TV Networks catalog all these clips in order to find them when they're useful for their purposes?

Edit: I don't mean the database where they get those clips from, but the actual process by which they manage to find a specific clip of something that happened decades ago. In my example, do they have to go through everything that guy ever said on TV to know if he said something related to the current topic? Is everything transcribed? How is the actual search process?
gpt
Most major news organizations have vast archives of video clips of broadcasts/major news events that companies can subscribe to and go through to grab clips from. And in the case of cable shows like The Daily Show/The Colbert Report their parent company Viacom owns a news agency directly so they probably don't have to pay for the subscription rights to use the clips.