Earlier quoted context omitted.
Not only are you not allowed to distribute it by the license, actually distributing it would get you sued for patent violation. Using anything you find in the code will probably get you sued for patent violation, too. EDIT: I can just imagine a future lawsuit: A: Did you read the MS-DOS source code released by Microsoft on XX? We have logs to show you downloaded it. B: Yes, but that has nothing to do with this lawsui…
Don't patents only last 15-20 years?
Yes. Design patents last 14 years. Utility patents last 20 years.
The person you are responding to, like most people, likely uses the words copyright, trademark and patent interchangeably as if they are synonyms.