# CITATION

Rognes T, Flouri T, Nichols B, Quince C, Mahé F. (2016) VSEARCH: a
versatile open source tool for metagenomics. **PeerJ** 4:e2584 doi:
[10.7717/peerj.2584](https://doi.org/10.7717/peerj.2584)


# REPORTING BUGS

Submit suggestions and bug-reports at
[https://github.com/torognes/vsearch/issues](https://github.com/torognes/vsearch/issues),
send a pull request on
[https://github.com/torognes/vsearch](https://github.com/torognes/vsearch),
or compose a friendly or curmudgeont e-mail to Torbjørn Rognes
(torognes@ifi.uio.no).


# AVAILABILITY
Source code and binaries are available at
[https://github.com/torognes/vsearch](https://github.com/torognes/vsearch).


# COPYRIGHT

Copyright (C) 2014-2025, Torbjørn Rognes, Frédéric Mahé and Tomás
Flouri

All rights reserved.

Contact: Torbjørn Rognes <torognes@ifi.uio.no>,
Department of Informatics, University of Oslo,
PO Box 1080 Blindern, NO-0316 Oslo, Norway

This software is dual-licensed and available under a choice
of one of two licenses, either under the terms of the GNU
General Public License version 3 or the BSD 2-Clause License.

## GNU General Public License version 3

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see
[http://www.gnu.org/licenses/](http://www.gnu.org/licenses/).


## The BSD 2-Clause License

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.


# ACKNOWLEDGMENTS

We would like to thank the authors of the following projects for
making their source code available:

- **vsearch** includes code from Google's CityHash project by Geoff
  Pike and Jyrki Alakuijala, providing some excellent hash functions
  available under a MIT license.
- **vsearch** includes code derived from Tatusov and Lipman's DUST
  program that is in the public domain.
- **vsearch** includes public domain code written by Alexander Peslyak
  for the MD5 message digest algorithm.
- **vsearch** includes public domain code written by Steve Reid and
  others for the SHA1 message digest algorithm.
- **vsearch** binaries may include code from the zlib library,
  copyright Jean-Loup Gailly and Mark Adler.
- **vsearch** binaries may include code from the bzip2 library,
  copyright Julian R. Seward.
