Licenses and source offers for the interactive Linux trainer
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The Linux course pages on this site run a Linux virtual machine inside
your browser. The files served under /lxtrainer/ include third-party
software; this file lists what is shipped, under which license, and how
to obtain the source code.

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1. Linux kernel + rootfs (linux4.iso)
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The bootable image is the stock demonstration image of the v86 project
(obtained from https://copy.sh/v86/images/linux4.iso). It is a
Buildroot-built GNU/Linux system: a Linux kernel (GPL-2.0) with a
BusyBox userland (GPL-2.0) and supporting libraries.

Source code for the GPL-licensed components as distributed here:
  - Linux kernel:  https://www.kernel.org/
  - BusyBox:       https://www.busybox.net/
  - Buildroot (the build system, including package sources):
                   https://buildroot.org/
  - The v86 project's image build configuration:
                   https://github.com/copy/v86

If you would like a copy of the corresponding source for the GPL
components exactly as distributed from this domain and cannot obtain it
from the locations above, contact the site author (see the About page at
https://www.yuval.guide/site/about/) and it will be provided at no more
than the cost of distribution.

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2. v86 x86 emulator (libv86.js, v86.wasm) - BSD 2-Clause
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https://github.com/copy/v86

Copyright (c) 2012, The v86 contributors
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.

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3. xterm.js terminal (xterm.js, xterm.css, addon-fit.js) - MIT
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https://github.com/xtermjs/xterm.js

Copyright (c) 2017-2019, The xterm.js authors (https://github.com/xtermjs/xterm.js)
Copyright (c) 2014-2016, SourceLair Private Company (https://www.sourcelair.com)
Copyright (c) 2012-2013, Christopher Jeffrey (https://github.com/chjj/)

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.

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4. SeaBIOS (seabios.bin) - LGPL-3.0
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https://www.seabios.org/ - source: https://gitlab.com/qemu-project/seabios
Distributed unmodified as shipped with the v86 project.

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5. Bochs/Plex86 VGABIOS (vgabios.bin) - LGPL-2.1
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https://github.com/bochs-emu/vgabios (historically vgabios.sourceforge.net)
Distributed unmodified as shipped with the v86 project.

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The trainer's own code (the LxTrainer engine and course runtime under
/lxtrainer/js/ and /lxtrainer/css/) is (c) Yuval Shaul.