# Ccache copyright and license

version 4.13.6

## Overall license

The license for ccache as a whole is as follows:

    This program is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License as published by the Free Software
    Foundation; either version 3 of the License, or (at your option) any later
    version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
    PARTICULAR PURPOSE. See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along with
    this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
    Street, Fifth Floor, Boston, MA 02110-1301 USA

The full license text can be found in GPL-3.0.txt and at https://www.gnu.org/licenses/gpl-3.0.html.

## Copyright and authors

Ccache is a collective work with contributions from many people, listed in doc/authors.adoc and at https://ccache.dev/credits.html. Subsequent additions by contributing authors are implicitly licensed to the public under the same terms (GNU GPL version 3 or later), but the contributing authors retain copyrights on their portions of the work.

The copyright for ccache as a whole is as follows:

    Copyright (C) 2002-2007 Andrew Tridgell
    Copyright (C) 2009-2026 Joel Rosdahl and other contributors

## Files derived from other sources

The ccache distribution contain some files from other sources and some have been modified for use in ccache. These files all carry attribution notices, and may qualify as ``separate and independent works in themselves'' for purposes of the GPL: that is, if separated from the ccache sources, they may be usable under less restrictive terms.

### src/third_party/blake3/blake3/*

This is a subset of BLAKE3 1.8.2 with the following license:

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### src/third_party/cpp-httplib/httplib.h

cpp-httplib - A C++11 cross-platform HTTP/HTTPS library. Copied from cpp-httplib v0.20.0 downloaded from cpp-httplib. The library has the following license:

    The MIT License (MIT)

    Copyright (c) 2025 yhirose

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### src/third_party/cxxurl/cxxurl/url.*

CxxUrl - A simple C++ URL class. Copied from CxxUrl v0.3 downloaded from https://github.com/chmike/CxxUrl. It has the following license text:

    The MIT License (MIT)

    Copyright (c) 2015 Christophe Meessen

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### src/third_party/fmt/fmt/*.h and src/third_party/fmt/fmt/format.cc

This is a subset of fmt 12.0.0 with the following license:

    Formatting library for C++

    Copyright (c) 2012 - present, Victor Zverovich and {fmt} contributors

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### src/third_party/tl-expected/tl/expected.hpp

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### src/third_party/win32-compat/win32/getopt.*

This implementation of `getopt_long()` for Win32 was taken from https://www.codeproject.com/Articles/157001/Full-getopt-Port-for-Unicode-and-Multibyte-Microso and is licensed under the LGPL.

The full license text can be found in LGPL-3.0.txt and at https://www.gnu.org/licenses/lgpl-3.0.html.

### src/third_party/win32-compat/win32/mktemp.*

This implementation of `mkstemp()` for Win32 was adapted from https://github.com/openbsd/src/blob/99b791d14c0f1858d87a0c33b55880fb9b00be66/lib/libc/stdio/mktemp.c and has the following license text:

    Copyright (c) 1996-1998, 2008 Theo de Raadt
    Copyright (c) 1997, 2008-2009 Todd C. Miller

    Permission to use, copy, modify, and distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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### src/third_party/win32-compat/win32/winerror_to_errno.h

The implementation of `winerror_to_errno()` was adapted from https://github.com/python/cpython/blob/1a79785e3e8fea80bcf6a800b45a04e06c787480/PC/errmap.h and has the following license text:

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