These two licenses apply to most of our products. If you have any questions regarding the use of our work, please send an email to firstname.lastname@example.org.
The short explanation of these licenses:
If you want to make our keyboards and sell them, you must make sure every customer is aware that the designs are available for free.
If you want to improve upon our designs and sell a product based on our work, you must also release your new designs to every customer for free.
If you want to do something other than those two things, you need to send an email to email@example.com.
These statements do not override, affect or modify the CERN or GPLv3 licensing, they merely serve as an abridged description for people curious about our peculiar business model.