You have it backwards: patents cover ideas (within limits); ideas are not copyrightable. Copyright can cover a particular way of expressing an idea. Good thing, too, or free software would have to wait more than 100 years, not 20, to implement an idea if someone got a legal monopoly on it.
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds