Branding is product specific. I wouldn’t be surprised if nobody can put a pink square and red circle on their controller due to trademark, but that doesn’t mean Sony owns red circles and pink squares. It means they have reserved the right to exclusively have those buttons on their controllers as it’s part of their branding. If other people put those buttons on their controllers it could be mistaken for a Sony controller. If you want to put a pink square and red circle on another product Sony doesn’t sell then you’re probably fine.