==============================================================================
WebP Photo Optimizer - License Information
==============================================================================

Copyright (C) 2026 技術人.com (https://tech-manblog.com/)

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, see <https://www.gnu.org/licenses/>.

==============================================================================
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

                            Preamble

The GNU General Public License is a free, copyleft license for
software and other kinds of works.

The licenses for most software and other practical works are designed
to take away your freedom to share and change the works.  By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.  We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors.  You can apply it to
your programs, too.

When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.

To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights.  Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.

For the complete terms and conditions of GNU General Public License v3,
please refer to https://www.gnu.org/licenses/gpl-3.0.txt

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THIRD-PARTY SOFTWARE LICENSES / ACKNOWLEDGEMENTS
==============================================================================

This software bundles or utilizes the following open-source third-party
components:

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1. PyQt6 & Qt6
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Copyright (C) 2026 Riverbank Computing Limited.
Copyright (C) 2026 The Qt Company Ltd.
Licensed under the GNU General Public License version 3 (GPL v3)
and GNU Lesser General Public License version 3 (LGPL v3).
https://www.riverbankcomputing.com/software/pyqt/
https://www.qt.io/

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2. pillow-heif & libheif / libde265 / x265
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pillow-heif source: Copyright (c) 2021-2026, Pillow-Heif contributors (BSD-3-Clause).
Windows binary wheel bundles:
- libheif (LGPL v3)
- libde265 (LGPL v3)
- x265 (GPL v2)
Due to base library licenses (x265), the Windows binary wheels are licensed under GPL v2.
https://github.com/bigcat88/pillow_heif

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3. Pillow (PIL Fork)
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Copyright (c) 1997-2026 by Secret Labs AB.
Copyright (c) 1995-2026 by Fredrik Lundh and contributors.
Licensed under the Historical Permission Notice and Disclaimer (HPND License).
https://github.com/python-pillow/Pillow

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4. Python 3.13 Runtime
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Copyright (c) 2001-2026 Python Software Foundation.
All rights reserved.
Licensed under the Python Software Foundation (PSF) License Agreement.
https://www.python.org/

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5. PyInstaller
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Copyright (c) 2010-2026, PyInstaller Development Team.
Licensed under the GNU General Public License version 2 (GPL v2) with Bootloader Exception.
https://pyinstaller.org/
