Ianal, usual disclaimers, etc.

The design files don't qualify for copyright protections, they describe the design which (maybe) qualifies for copyright protections.[0]

The artistic design of a specific keyboard can certainly be copyrighted, but not the functional nature of it.

[0]The exact wording might be protected, but not the factual information contained. Sports scores, or say measurements of a keyboard, are not copyrightable items as they are just facts, though their presentation might be.