Licenses & Copyright
====================

This license file adheres to the formatting guidelines of
[readable-licenses](https://github.com/nevir/readable-licenses).


Ribose's BSD 2-Clause License
-----------------------------

Copyright (c) 2017-2021, [Ribose Inc](https://www.ribose.com).
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.

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 OWNER 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.


NetBSD's BSD 2-Clause License
-----------------------------

This software contains source code originating from NetPGP, which
carries the following copyright notice and license.

Copyright (c) 2009-2016, [The NetBSD Foundation, Inc](https://www.netbsd.org).
All rights reserved.

This code is derived from software contributed to The NetBSD Foundation
by [Alistair Crooks](mailto:agc@NetBSD.org)

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.


Nominet UK's Apache 2.0 Licence
-------------------------------

This software contains source code originating from NetPGP, which
carries the following copyright notice and license.

Copyright (c) 2005-2008 [Nominet UK](www.nic.uk)
All rights reserved.

Contributors: Ben Laurie, Rachel Willmer. The Contributors have asserted
their moral rights under the UK Copyright Design and Patents Act 1988 to
be recorded as the authors of this copyright work.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License.  You may obtain a copy of the
License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.  See the License for the
specific language governing permissions and limitations under the License.


Nominet UK's BSD 3-Clause License
-------------------------------

This software contains source code originating from NetPGP, which
carries the following copyright notice and license.

Copyright (c) 2005 [Nominet UK](www.nic.uk)
All rights reserved.

Contributors: Ben Laurie, Rachel Willmer. The Contributors have asserted
their moral rights under the UK Copyright Design and Patents Act 1988 to
be recorded as the authors of this copyright work.

This is a BSD-style Open Source licence.

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 name of Nominet UK or the contributors may not be used to
    endorse or promote products derived from this software without specific
    prior written permission;

and provided that the user accepts the terms of the following disclaimer:

THIS SOFTWARE IS PROVIDED BY NOMINET UK 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 NOMINET UK 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.


MIT License for SHA-1 collision detection code
----------------------------------------------

These files are derived from
[sha1collisiondetection-tools](https://github.com/cr-marcstevens/sha1collisiondetection-tools),
which is distributed with this [license](https://github.com/git/sha1collisiondetection/blob/master/LICENSE.txt)
reproduced below.

* `src/lib/crypto/sha1cd/sha1.{c,h}`
* `src/lib/crypto/sha1cd/ubc_check.{c,h}`

Copyright (c) 2017:

    Marc Stevens
    Cryptology Group
    Centrum Wiskunde & Informatica
    P.O. Box 94079, 1090 GB Amsterdam, Netherlands
    marc@marc-stevens.nl

    Dan Shumow
    Microsoft Research
    danshu@microsoft.com

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.
