Optim.jl is licensed under the MIT License:

> Copyright (c) 2012: John Myles White, Tim Holy, and other contributors.
> Copyright (c) 2016: Patrick Kofod Mogensen, John Myles White, Tim Holy,
>                     and other contributors.
> Copyright (c) 2017: Patrick Kofod Mogensen, Asbjørn Nilsen Riseth,
>                     John Myles White, Tim Holy, and other contributors.
>
> 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.
