Anonymous work

Anonymous works are works, such as art or literature, that have an anonymous, undisclosed, or unknown creator or author. In the case of very old works, the author's name may simply be lost over the course of history and time. There are a number of reasons anonymous works arise.
Description.
In the United States, anonymous work is legally defined as "a work on the copies or phonorecords of which no natural person is identified as author."
Explanations.
In the case of very old works, the author's name may simply be lost over the course of history and time. In such cases the author is often referred to as , the Latin form of "anonymous". In other cases, the creator's name is intentionally kept secret. The author's reasons may vary from fear of persecution to protection of his or her reputation. Legal reasons may also bar an author from self-identifying, as in 2007 when "The Washington Post" published an article by an anonymous author—who would have preferred to be named—describing the use of national security letters by the FBI.