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It varies slightly from country to country. Most laws are based on the Berne Convention, which has slightly reduced term for anonymous works, but pseudonymous works with a known author are treated just like works under the author's real name. In official speak:
In the case of anonymous or pseudonymous works, the term of protection granted by this Convention shall expire fifty years after the work has been lawfully made available to the public. However, when the pseudonym adopted by the author leaves no doubt as to his identity, the term of protection shall be that provided in paragraph (1). If the author of an anonymous or pseudonymous work discloses his identity during the above-mentioned period, the term of protection applicable shall be that provided in paragraph (1). The countries of the Union shall not be required to protect anonymous or pseudonymous works in respect of which it is reasonable to presume that their author has been dead for fifty years.
Specific information for US works is at the link below.
What else can I help you with?
Do you have to register a Nom de Plume?
a 'nom de plume' is apseudonym for writers. There is no registration.
What is a writer's nom de plume?
name of pen, which also states that John McGinley is awesome.
Use Nom de plume in a sentence?
Samuel Clemens wrote his most famous novels under the nom de plume Mark Twain.
What is a sentence with the word nom de plume?
Charles Dodgson is best known today by his nom de plume, Lewis Carroll.
What did Nom de Plume do to Stephen King?
Nom de Plume, a fellow author, accused Stephen King of stealing the idea for his novel "Misery" from one of Nom de Plume's own works. The accusation was vehemently denied by King and the matter was eventually settled out of court.
What is davis's nom de plume?
George Eliot
What is Viaud's nom de plume?
Pierre Loti
What is the french term for a pen name?
nom de plume
What is the writer's nom de plume?
a nom de plume is a false name or a name under which a writer writes in order to maintain anonymity.
What type of person would have a nom de plume?
Plume in French = pen in English, so, a 'nom de plume' is a pen name, exactly the same as an internet nickname. Classicly, however, a typical user would be an author who wished to remain anonymous.
What does the prefix nom mean?
The prefix 'nom' means name. For example: - misnomer - nominate - nominal - nom de plume (which means " a pen name") etc...
What is another name for an undercover name?
An 'alias' or 'nom-de-plume'.
