This guy has gotten cease and desist letters from catheter companies as well as been sued for two billion dollars. Watch his talk on the matter, it is really great - https://www.youtube.com/watch?v=KSWqx8goqSY
I don't think that is as certain as you present it. Giving something away does not relinquish copyright, it merely passes one physical copy to someone else.
If what you state would be true then the GPL wouldn't have a leg to stand on, physical copies are rarely if ever used!