Linus and Linux Protected under Parody?

[Brian Kelsay]

 —--------------------Quote-----------------------
<i>Can a cleanroom re-implementation -- using nothing but published specs -- of a header file be 
subject to someone's copyright? </i>
I'm sure someone will correct me if I'm wrong but I was under the impression that copyright covered 
specific expressions of ideas. And besides, Linus's original versions of some of these header files 
contained (in his opinion; not mine) flawed implementation of certain macros, different error 
numbers (especially in the i386 headers), etc. and that might even qualify them as being parodies 
of the ATT/BSD originals. :-) 
—-----------------End Quote-----------------------
I found the above nestled in comments to an article on Groklaw.  
http://www.newsforge.com/business/03/12/29/1413240.shtml?tid=2&tid=82&tid=85&tid=94

Brian Kelsay