Not sure if the "Eyewitness News" name is copyrighted. Seattle's KIRO-TV (CBS) used the term from the late 60's to about 2015. Suddenly dropped it for whatever reason. I still think it is a powerful brand name, but perhaps live internet streams have deemed it unimportant. Not sure.
I doubt Eyewitness News is copyrighted. It was used by both ABC O&Os, and Westinghouse owned stations. As I noted earlier, it was used for at least 44 years by KPIX 5 San Francisco, a CBS affiliate owned by Westinghouse - now a CBS O&O. When I first moved to the Bay Area 44 years ago, it seemed odd that it was attached to a CBS affiliate, because I was used to it from KABC-TV in LA. The ABC O&O here (KGO-TV) was News Scene back in the 70s, so I assume KPIX beat them to the Eyewitness branding. Otherwise, KGO-TV's news was very similar to KABC-TV, including that Cool Hand Luke intro theme music.