The Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA) normally applies to derivative works containing CAD symbols and footprints from SnapEDA, including designs, design files and manufactured boards. However, we decided that you should be able to use CAD symbols and footprints to design and produce any printed circuit board, regardless of the license. Therefore, the license for CAD symbols and footprints contains the following Design Exclusion 1.0:

You have permission to propagate a work of a design, design file(s) and/or manufactured board(s) formed by combining CAD symbols and footprints provided by SnapEDA, even if such propagation would otherwise violate the terms of CC BY-SA. You may then convey such a combination under terms of your choice.