Update faq.rst

Selling files

documentation/src/faq.rst

@@ -15,6 +15,11 @@ Can I sell boxes I created with Boxes.py
 
 Yes. Boxes.py is under the GPLv3 license (see https://www.gnu.org/licenses/gpl-3.0.html). This license grants you far reaching rights on what you can do with the software including using it and the drawings it produces to any means. The license also puts some obligations on you. But those are about changing and distributing the software itself. The resulting drawings do not fall under the GPL license.
 
+Can I sell files generated by Boxes.py
+-------------------------------------
+
+Yes, but... The license does allow for that. But selling the plain files that people can get for free is a scam in my eyes and may or may not be fraud. It is a different story completely if you modify the drawing - e.g. add decoration - and tell your customers that the drawing is based on Boxes.py. This way the can see what part if the work they are actually paying for. 
+
 Why do my parts not fit together?
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