you just don't have any idea of all the symbols this logo represents and how much effort was put into it... hahahaha
branding is a "science"
my take is that you can still use a name that is copyrighted but if you intend to compete with the rightful owner of the copyright you'll run into troubles for sure.
like:
you can call your company "IBM" and it's going to be ok if you sell anything BUT I.T related products as it will be misleading...
one clear exception is made for the names if I remember well.
let's say your name is Apple nobody can prevent to use your name for your business... (wish your last name is Ipod now?...

)
the timing plays a role as well: let's say you are operating a company called Microsoft in singapore back in early 70s before Bill Gates takes over the market. even though they have a copyright/trademark they won't be able to sue you.
as long as you use it wisely...