This is something I don't get. You're supposed to be able to integrate BSD-licensed (or even Public Domain) code into GPL works, right? The fact that something

This is something I don't get. You're supposed to be able to integrate BSD-licensed (or even Public Domain) code into GPL works, right? The fact that something shows up in GPL code means what exactly? This is like: there are scholarly books that quote extensive from original philosophers -- long, third-of-a-page quotations. Still I should be able to quote something in its original language (translations may be copyrighted) copying from the derived work. Copyrighted work is not supposed to be able to poison noncopyrighted work it originates from.