EDIT: The following paragraph is incorrect, I was misinformed - see the child post.
Also, this was almost certainly a YouTube takedown request, not a DMCA request. YouTube is free to take down whatever it likes, and Samsung is free to request a takedown for whatever it likes - whether it's a valid copyright claim or not. It's only when Samsung brings it through the courts rather than through YouTube's system that it becomes a DMCA request with legal requirements. Not that censorship or siding with certain companies is good for YouTube's reputation, or that submitting legally-meaningless take down requests is good for Samsung's, but it's important to distinguish the DMCA from simple requests.