LICENSE.txt

The QCAD 3 source code is open source and distributed under GPL version 3
with optional exceptions.
See files:
- gpl-3.0.txt
- gpl-3.0-exceptions.txt (if available)

Hershey fonts are released under the terms described in fonts/hershey.readme.
Other fonts in directory 'fonts' are released as public domain (all copyright
is waived). 

Icons and documentation are distributed under the terms of the 
'Creative Commons Attribution 3.0 Unported' license.
See cc-by-3.0.txt

3rd party libraries and plug-ins in src/3rdparty are distributed under 
their respective licenses:

dxflib:             GPL version 2.0 or greater.
                    See 3rdparty/dxflib/gpl-2.0greater.txt
                    Commercial licenses of dxflib for proprietary use are also available.
opennurbs:          Public domain (neither copyright nor copyleft apply).
                    See 3rdparty/opennurbs/readme.txt
spatialindexnavel:  MIT
                    See 3rdparty/spatialindexnavel/COPYING
stemmer:            BSD 2-Clause License
                    See 3rdparty/stemmer/bsd-2.txt
quazip:             LPGL version 2.1 or greater.
                    See 3rdparty/quazip/lgpl-2.1.txt