Where are the lines of that when it's physical things?
The automotive aftermarket has largely settled that; even without the original design files, it's perfectly legal to make compatible parts, patents and the like notwithstanding. You can build an entire "small block Chevy" engine wholly from parts that GM did not make, and it will fit perfectly in a car that originally had the "genuine" one.
IANAL but as long as you don't violate any patents they have (if any) nor use their trademark, feel free to make and sell keyboards that look like theirs (not that a keyboard of their design is particularly distinctive anyway.)
The automotive aftermarket has largely settled that; even without the original design files, it's perfectly legal to make compatible parts, patents and the like notwithstanding. You can build an entire "small block Chevy" engine wholly from parts that GM did not make, and it will fit perfectly in a car that originally had the "genuine" one.
IANAL but as long as you don't violate any patents they have (if any) nor use their trademark, feel free to make and sell keyboards that look like theirs (not that a keyboard of their design is particularly distinctive anyway.)