Post History

Source: https://writers.stackexchange.com/a/5005
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Disclaimer: I am not a lawyer. This is a complicated area of law, but I'll give you the 30,000 foot view to get you started.

By default (at least, under U.S. law), each co-author owns an equal interest in the work's copyright. This is irrespective of how much (or how little) each co-author contributed to the work. So, absent of any agreement, if there are two authors, the split is 50/50, thirds for three authors, and so on.

For someone who collaborates on a work to be considered an "author," his contribution must be independently copyrightable. That means:

- Someone who designs **illustrations** with the intent that they should be used in a specific book is a **co-author** (graphics designs are copyrightable)

- Someone who composes the **music** for a song, or writes its **lyrics** , is a **co-author** (music and lyrics are copyrightable) 

- Someone who comes up with the general **idea** for a screenplay is **not a co-author** (ideas are not copyrightable) 

- Someone who researches population statistics for a geography textbook is **not a co-author** (facts are not copyrightable) 

- Someone who invents the algorithm for a new search engine (but does not write the actual computer code) is **not a co-author** (algorithms are non-copyrightable processes) 

Each co-author can exploit the work in any way they seem fit (license the work, create derivative works, etc.), but they have to split all the profits with the other co-authors in equal parts. A co-author does not need to seek permission from the other co-author(s) to use the work, and likewise, a co-author cannot prevent the other co-author(s) from using the work.

An exception is the grant of an exclusive license, which requires the consent of all co-authors.

Co-authors' shares of a copyright are property interests that pass to their respective heirs.

References:

- [http://www.ober.com/publications/291-avoiding-joint-pain-treatment-joint-works-authorship-conditions](http://www.ober.com/publications/291-avoiding-joint-pain-treatment-joint-works-authorship-conditions)

- [http://www.kowi.de/Portaldata/2/Resources/FP6\_alt/ipr\_joint\_ownership.pdf](http://www.kowi.de/Portaldata/2/Resources/FP6_alt/ipr_joint_ownership.pdf)

Original score: 4