---
title: BSD 4-Clause "Original" or "Old" License
spdx-id: BSD-4-Clause

description: A permissive license similar to the BSD 3-Clause License, but with an "advertising clause" that requires an acknowledgment of the original source in all advertising material.

how: Create a text file (typically named LICENSE or LICENSE.txt) in the root of your source code and copy the text of the license into the file. Replace [year] with the current year and [fullname] with the name (or names) of the copyright holders. Replace [project] with the project organization, if any, that sponsors this work.

using:
  Choco-solver: https://github.com/chocoteam/choco-solver/blob/master/LICENSE
  PMSPAUR-public: https://github.com/ArthurGodet/PMSPAUR-public/blob/master/LICENSE
  Switchblade: https://github.com/SwitchbladeBot/switchblade/blob/dev/LICENSE

permissions:
  - commercial-use
  - modifications
  - distribution
  - private-use

conditions:
  - include-copyright

limitations:
  - liability
  - warranty

---

BSD 4-Clause License

Copyright (c) [year], [fullname]
All rights reserved.

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.

3. All advertising materials mentioning features or use of this software must
   display the following acknowledgement:
     This product includes software developed by [project].

4. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDER "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 COPYRIGHT HOLDER 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.
