The original code has been separated out from the Optim.jl package,
licensed under the MIT License:
> Copyright (c) 2012: John Myles White and other contributors.

The LineSearches.jl package is licensed under the MIT "Expat" License:

> Copyright (c) 2016: Asbjørn Nilsen Riseth 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.

The More-Thuente algorithm in `src/morethuente.jl` is originally translated from MINPACK, and contains the following copyright notice:

> Minpack Copyright Notice (1999) University of Chicago.  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. The end-user documentation included with the
> redistribution, if any, must include the following
> acknowledgment:

>    "This product includes software developed by the
>    University of Chicago, as Operator of Argonne National
>    Laboratory.

> Alternately, this acknowledgment may appear in the software
> itself, if and wherever such third-party acknowledgments
> normally appear.

> 4. WARRANTY DISCLAIMER. THE SOFTWARE IS SUPPLIED "AS IS"
> WITHOUT WARRANTY OF ANY KIND. THE COPYRIGHT HOLDER, THE
> UNITED STATES, THE UNITED STATES DEPARTMENT OF ENERGY, AND
> THEIR EMPLOYEES: (1) DISCLAIM ANY WARRANTIES, EXPRESS OR
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> DO NOT WARRANT THAT THE SOFTWARE WILL FUNCTION
> UNINTERRUPTED, THAT IT IS ERROR-FREE OR THAT ANY ERRORS WILL
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> 5. LIMITATION OF LIABILITY. IN NO EVENT WILL THE COPYRIGHT
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> ENERGY, OR THEIR EMPLOYEES: BE LIABLE FOR ANY INDIRECT,
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> PROFITS OR LOSS OF DATA, FOR ANY REASON WHATSOEVER, WHETHER
> SUCH LIABILITY IS ASSERTED ON THE BASIS OF CONTRACT, TORT
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> EVEN IF ANY OF SAID PARTIES HAS BEEN WARNED OF THE
> POSSIBILITY OF SUCH LOSS OR DAMAGES.
