What is Anonymous?

Legal Definition
Without name. This word is applied to such.books, letters or papers, which are published without the author's name. No man is bound to publish his name in connexion with a book or paper he has publisbed; but if the publication is libellous, he is equally responsible as if his name were published.
-- Bouviers Law Dictionary
Legal Definition
Nameless; wanting a name or names. A publication, withholding the name of the author, is said to be anonymous. Cases are sometimes reported anonymously, i. e, without giving the names of the parties. Abbreviated to "Anon."
-- Black's Law Dictionary