My
understanding of the GNU FDL is that we can't incorporate "fair
use" material unless we implictly declare those sections as "Invariant
Sections".
What!? how could this possibly be?
Why would the GNU FDL be stricter than ordinary copyright law?
If I quote a line from a biography of Winston Churchill
in my own FDL biography, why must that be invariant?
This doesn't make any sense to me.