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SPDX Annotations
SPDX annotations declare metadata about the file they are placed in, like the license of the content contained within, the copyright holders or where the content originates from.
Generally every file whose format allows adding comments should contain SPDX annotations.
Placement
SPDX annotations should be placed in inline comments at the top of the file.
// SPDX-License-Identifier: LGPL-2.1-or-later
Some file formats or file content may prevent this, for example shebang declarations may already occupy the first line in a script file, in that case simply add the annotations in the following lines.
#!/usr/bin/env bash
# SPDX-License-Identifier: LGPL-2.1-or-laterLicense
To declare what license a file falls under, specify the appropriate License Id in the following way:
SPDX-License-Identifier: ‹License Id›C++
// SPDX-License-Identifier: ‹License Id›
Python
# SPDX-License-Identifier: ‹License Id›Copyright
To declare who holds the copyright to a file, add one annotation for every person / organization:
SPDX-FileCopyrightText: ‹Year› ‹Entity›‹Year› is the year the code was published in.
‹Entity› is either a person or an organization.
Person
SPDX-FileCopyrightText: 1999 Robert RobertsonOrganization
SPDX-FileCopyrightText: 2000 Crazy CAD TechnologiesExamples
1. Internal C++ Source File
You just wrote a new .cpp file from scratch and want to license it under the standard license FreeCAD uses ( LGPL-2.1-or-later )
// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: 2026 Mike Mc Mickers
// SPDX-FileNotice: Part of the FreeCAD project.
...2. External C++ Source File
You want to include some pre-existing code licensed under a compatible but different license to what FreeCAD uses by default.
// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 1939 The Wizard of Oz
// SPDX-FileNotice: Part of the FreeCAD project.
...3. Mixed Python Licensing
You have some existing code licensed under one license but also want to add some code under a different license.
# SPDX-License-Identifier: LGPL-2.1-or-later AND MIT
# SPDX-FileCopyrightText: 2010 Technology Inc
# SPDX-FileCopyrightText: 2026 Jane Jay Jensen
# SPDX-FileNotice: Part of the FreeCAD project.
...4. Executable Python Script
You have a Python script with a Shebang declaration.
#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later
# SPDX-FileCopyrightText: 2011 Nyan Cat
# SPDX-FileNotice: Part of the FreeCAD project.
...Icons
Icons should have whatever license the author intended, for example CC-BY-SA-4.0.
In svg files this is declared via metadata, not as a SPDX comment.
Documentation
Besides the wiki, currently we don’t license documentation, however you might want to consider putting it under the Unlicense or CC-BY-SA-4.0.
Copyright Headers
Copyright headers are an artifact of old software, they are currently still kept around for any existing files that have them and are added to new C++ & Python source files.
Conditions
Copyright headers should be added to new files if ALL of the following apply:
-
The file is
C++orPythonsource code. -
The file is purely original code.
-
The code was written for the FreeCAD project.
-
The code is licensed under
LGPL-2.1-or-later.
Statements
Copyright statements should be made via SPDX annotations.
License Text
FreeCAD is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 2.1
of the License, or (at your option) any later version.
FreeCAD 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with FreeCAD. If not, see https://www.gnu.org/licensesCopyright Snippets
Below you will find some snippets of the commonly used SPDX annotations / copyright headers.
C++
// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: ‹Year› ‹Entity›
// SPDX-FileNotice: Part of the FreeCAD project.
/******************************************************************************
* *
* FreeCAD is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation, either version 2.1 *
* of the License, or (at your option) any later version. *
* *
* FreeCAD 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with FreeCAD. If not, see https://www.gnu.org/licenses *
* *
******************************************************************************/Python
# SPDX-License-Identifier: LGPL-2.1-or-later
# SPDX-FileCopyrightText: ‹Year› ‹Entity›
# SPDX-FileNotice: Part of the FreeCAD project.
################################################################################
# #
# FreeCAD is free software: you can redistribute it and/or modify #
# it under the terms of the GNU Lesser General Public License as #
# published by the Free Software Foundation, either version 2.1 #
# of the License, or (at your option) any later version. #
# #
# FreeCAD 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 Lesser General Public License for more details. #
# #
# You should have received a copy of the GNU Lesser General Public #
# License along with FreeCAD. If not, see https://www.gnu.org/licenses #
# #
################################################################################Others
Reminder: Other file types only require SPDX annotations, not copyright headers.
// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: ‹Year› ‹Entity›
// SPDX-FileNotice: Part of the FreeCAD project.
# SPDX-License-Identifier: LGPL-2.1-or-later
# SPDX-FileCopyrightText: ‹Year› ‹Entity›
# SPDX-FileNotice: Part of the FreeCAD project./* SPDX-License-Identifier: LGPL-2.1-or-later */
/* SPDX-FileCopyrightText: ‹Year› ‹Entity› */
/* SPDX-FileNotice: Part of the FreeCAD project. */@REM SPDX-License-Identifier: LGPL-2.1-or-later
@REM SPDX-FileCopyrightText: ‹Year› ‹Entity›
@REM SPDX-FileNotice: Part of the FreeCAD project.