As a non lawyer, I don't feel comfortable with the definition of Complete Source, as the extent of it is not clearly defined. Building a product may require a know-how, or parameters (like tolerances, precision...) that is not always easily expressed.

Honestly I don't see any universal solution to this problem.

Maybe the Licensor could specify what is the Complete Source. For example if I draw the schematics of an electronic design, the Complete Source of the product would be the schematics (of course), but also the PCB design, the BOM...