Exit Zen
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[[!meta title="License and source code distribution"]]
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Tails is [Free Software](https://www.gnu.org/philosophy/free-sw.html): you can download, use, and share it with no restrictions.
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The Tails source code is released under the GNU/GPL (version 3 or above) and is Copyright (C) Tails developers <info@tails.net>. Any exception to this rule is documented either below or in the affected source file.
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However, Tails includes non-free firmware in order to work on as much hardware as possible.
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Source code
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Most of the software included in Tails is taken directly from upstream Debian packages and is neither modified nor recompiled by Tails.
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The source code of software that is specific to Tails is available in [[our Git repositories|contribute/git]].
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The source code of the Debian packages included in Tails is available in the [APT snapshot](https://tagged.snapshots.deb.tails.boum.org/) that we created for that version of Tails.
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The [[!tails_gitweb config/chroot_local-includes/usr/share/tails/chroot-browsers/unsafe-browser/extensions/red-2.0-an+fx.xpi desc="red theme"]] used by Tails' _Unsafe Browser_ was downloaded from Mozilla add-ons website (<https://addons.mozilla.org/en-US/firefox/addon/simplyred/>):
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license: Creative Commons Attribution 3.0
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author: [Firefox user 14030863](https://addons.mozilla.org/en-US/firefox/user/14030863/)
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Website
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This website uses several images with distinct copyright, licenses, trademarks and distribution terms:
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The Tails logo is based on [[USB|http://thenounproject.com/term/usb/23873/]] by Ilsur Aptukov from the Noun Project.
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- Debian logo: Copyright (c) 1999 Software in the Public Interest.
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Onion logo: registered trademark of The Tor Project, Inc.; the Tails project is authorized to use it under certain conditions; licensed under Creative Commons Attribution 3.0 United States License.
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- [Forge](https://github.com/digitalbazaar/forge/), copyright Digital Bazaar, Inc.
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The drawings on our [[Home|index]], [[About|about]], and [[Warnings|doc/about/warnings]] pages are licensed under the [Creative Commons Attribution-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/), copyright [Andrés Fernández Cordón](https://anhdres.com/) ([[source|lib/drawings.zip]] for Adobe Illustrator).
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All the [[drawings of our personas|contribute/personas]] are licensed under the [Creative Commons Attribution-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/), copyright Thomas Verguet.
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The [[Boot Menu animation|doc/first_steps/start/pc#animation]] is licensed under the [Creative Commons Attribution-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/), copyright [Odile Carabantes](https://studiomoare.com/) and [Enso Studio](https://www.ensostudio.tv/) ([source](https://gitlab.tails.boum.org/tails/ux/-/raw/master/boot%20menu%20key/animation.rar) for Adobe Illustrator and Adobe Premiere).
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