Atropos began as a fork of Cutadapt [1]. Specifically, it is a fork of commit
2f3cc0717aa9ff1e0326ea6bcb36b712950d4999 on June 22, 2016. All
code that remains in its original form is subject to the MIT license (below):

> Copyright (c) 2010-2016 Marcel Martin <marcel.martin@scilifelab.se>
>
> Permission is hereby granted, free of charge, to any person obtaining a copy
> of this software and associated documentation files (the "Software"), to deal
> in the Software without restriction, including without limitation the rights
> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> copies of the Software, and to permit persons to whom the Software is
> furnished to do so, subject to the following conditions:
>
> The above copyright notice and this permission notice shall be included in
> all copies or substantial portions of the Software.
>
> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> THE SOFTWARE.

All additions and non-trivial modifications (which can be discovered by comparing
the Atropos source [2] against [3]) were created by John P Didion, and are subject to
the below copyright wavier:

> This is a work of the United States Government, and is in the public domain
> within the United States. The National Human Genome Research Institute (National
> Institutes of Health, Department of Health and Human Services) waives copyright and
> related rights in the work worldwide through the CC0 1.0 Universal Public Domain
> Dedication [4].

[1] https://github.com/marcelm/cutadapt
[2] https://github.com/jdidion/atropos
[3] https://github.com/marcelm/cutadapt/tree/2f3cc0717aa9ff1e0326ea6bcb36b712950d4999
[4] https://creativecommons.org/publicdomain/zero/1.0/
