OVERALL LICENSE of the YSLib Project

© 2010-2022 FrankHB <frankhb1989@gmail.com>.

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed without written permission.

Preamble

This file is the overall license document of the YSLib Project.

This document is for the current version. See LICENSE_HISTORY.txt about licenses for history versions.

This document contains multiple options of license application combination.

The copyright notice above, as well as the clauses of basic permissions and the disclaimer, are intended to be equivalent to the license derived from the template of BSD 2-Clause license (https://spdx.org/licenses/BSD-2-Clause.html) in legal effects. This is treated as the minimal basis of this document, applicable for all works not covered by other required licenses for external dependencies.

Although not strictly required, it is recommended to redistribute this document instead of the minimal terms and conditions implied.

Otherwise, if the minimal basis is retained, it is permitted to have differences conforming to following rules:

	The word "shall" in the subclauses may be replaced by the word "must".

	The equivalent replacements established in SPDX License List Matching Guidelines, v2.1 (https://spdx.dev/license-list/matching-guidelines/) are allowed, such as:

		The copyright sign (©) in the copyright notice may be replaced by alternative equivalent expressions.

		Ordinals may be added to the subclauses.

	Any other visible texts in the subclauses are kept verbatim, or kept in a form allowing to reproduce the texts with the replacements in the rule above.

The permission of replacements above allows appliations of the minimal basis to denote the license in compatible ways of BSD 2-Clause license without a copy of this document, for example, by using a SPDX identifier defined in https://spdx.org/licenses/ or ISO/IEC 5962:2021.

TERMS AND CONDITIONS

0. OVERALL DEFINITIONS

DOCUMENTS are materials of human-readable texts and/or images not in the program code.

DOCUMENTS in following files are defined hereby as LICENSE DOCUMENTS.

LICENSE.txt
LICENSE_HISTORY.txt
CC BY-SA 3.0 legalcode.txt
gpl-2.0.txt
gpl-3.0.txt
FTL.TXT

DOCUMENTS created by the YSLib project, whose names have the prefix "Readme", are README DOCUMENTS.

1. NORMATIVE REFERENCES

CC BY-SA 3.0 legalcode.txt:
http://creativecommons.org/licenses/by-sa/3.0/legalcode.txt

gpl-2.0.txt:
http://www.gnu.org/licenses/gpl-2.0.txt

gpl-2.0.txt:
http://www.gnu.org/licenses/gpl-3.0.txt

FTL.txt:
http://www.freetype.org/FTL.TXT

2. Basic Permissions

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

	Redistributions of source code shall retain the above copyright notice, this list of conditions and the following disclaimer.

	Redistributions in binary form shall reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Documents

All DOCUMENTS in the YSLib Project except LICENSE DOCUMENTS are also licensed under:

Creative Commons Attribution-ShareAlike 3.0 Unported - See CC BY-SA 3.0 legalcode.txt.

In the directory "3rdparty", if not otherwise specified in LICENSE DOCUMENTS or README DOCUMENTS in the corresponding library directories, all derived work are licensed as the same as the original materials.

4. External Dependencies

Some copyrighted materials from external projects (with or without modifications) are used in the YSLib project.
Permissions subject to these materials may be also granted separatedly according to the corresponding terms in LICENSE DOCUMENTS when applicable, referred as "independert distribution" below.
They are used in the YSLib project in following ways with permissions from appropriate licences in LICENSE DOCUMENTS.

4.1 License for FreeType

At least one of the following licenses shall be used for independert distribution:

The FreeType Project LICENSE - See FTL.txt;
GNU General Public License Version 2 - See gpl-2.0.txt.

To satisfy the license compatibility requiements, FreeType License is adopted for the whole YSLib project distribution and any use relying on statically linked FreeType binaries in the YSLib project.

4.2 License for FreeImage

At least one of the following licenses shall be used for independert distribution:

FreeImage Public License - Version 1.0 - See license-fi.txt;
GNU General Public License Version 2 - See gpl-2.0.txt.

To satisfy the license compatibility requiements, FreeImage Public License is adopted for the whole YSLib project distribution and any use relying on statically linked FreeImage binaries in the YSLib project.

5. DISCLAMER

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 HOLDER 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.

Appendix A. Important Note of Licensing

Several licenses may have conflict requirements to be applicable. Some of them may not allow relicensing.
Make sure the appropriate choice of the license combination before redistribution, especially for derivative works.

See also http://www.freetype.org/license.html for some details.