Mark Twain was a prominent American author in multiple genres, including fiction and journalism, during the 19th century.
Mark Twain was a prominent American author in multiple genres, including fiction and journalism, during the 19th century.

Joint authorship of a copyrightable work is when two or more persons contribute enough to the work to be the author of that work.

- Joint authorship

If more than one person created the work, then a case of joint authorship can be made provided some criteria are met.

- Author
Mark Twain was a prominent American author in multiple genres, including fiction and journalism, during the 19th century.

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European output of books before the advent of copyright, 6th century to 18th century. Blue shows printed books. Log-lin plot; a straight line therefore shows an exponential increase.

Copyright

Type of intellectual property that gives its owner the exclusive right to copy, distribute, adapt, display, and perform a creative work, usually for a limited time.

Type of intellectual property that gives its owner the exclusive right to copy, distribute, adapt, display, and perform a creative work, usually for a limited time.

European output of books before the advent of copyright, 6th century to 18th century. Blue shows printed books. Log-lin plot; a straight line therefore shows an exponential increase.
The Statute of Anne (the Copyright Act 1709) came into force in 1710.
The Pirate Publisher—An International Burlesque that has the Longest Run on Record, from Puck, 1886, satirizes the then-existing situation where a publisher could profit by simply copying newly published works from one country, and publishing them in another, and vice versa.
A copyright symbol used in copyright notice
A copyright symbol embossed on a piece of paper.
Expansion of US copyright law (currently based on the date of creation or publication)
DVD: All rights reserved

Typically, the first owner of a copyright is the person who created the work i.e. the author.

But when more than one person creates the work, then a case of joint authorship can be made provided some criteria are met.