OCCT_LGPL_EXCEPTION.txt

Open CASCADE exception (version 1.0) to GNU LGPL version 2.1.

The object code (i.e. not a source) form of a "work that uses the Library"
can incorporate material from a header file that is part of the Library.
As a special exception to the GNU Lesser General Public License version 2.1,
you may distribute such object code incorporating material from header files
provided with the Open CASCADE Technology libraries (including code of CDL
generic classes) under terms of your choice, provided that you give
prominent notice in supporting documentation to this code that it makes use
of or is based on facilities provided by the Open CASCADE Technology software.