The Tails source code is released under the GNU/GPL (version 3 or above) and is Copyright (C) Tails developers <foundations@tails.net>.Any exception to this rule is documented either below or in the affected source file.
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.
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/>):
[Source Sans 3](https://fonts.google.com/specimen/Source+Sans+3/license), copyright 2010–2020 [Adobe Systems Incorporated](http://www.adobe.com/), licensed under the [SIL Open Font License, Version 1.1](https://openfontlicense.org/open-font-license-official-text/).
[Source Code Pro](https://fonts.google.com/specimen/Source+Code+Pro/license)copyright 2010–2020 [Adobe Systems Incorporated](http://www.adobe.com/), licensed under the [SIL Open Font License, Version 1.1](https://openfontlicense.org/open-font-license-official-text/).