I cannot understand how people can say that a copyrighted indicator is in the public domain.
If there is a copyright it is not public domain. It is not because it is freely available that it is in public domain.
For instance I can get a book free in a library but I am only allowed to read it, not to change his title and sell it. (Could you even imagine somebody doing it?)
People will never do that with a book but some people find that normal when it is on internet.