You can license the clips by going to the AP Archive website; e.g., this video https://www.youtube.com/watch?v=GjZ6NNLCdio can be licensed from here: http://www.aparchive.com/metadata/youtube/c0016a30f75d456abf... (the link was in the description on YouTube).
I assume they stuck with the Standard YouTube License because that lets them keep ownership of the videos and license them out separately under their own terms.