> Furthermore it is profoundly curious to claim that a cross platform filesystem that began life on Solaris and existed for years as a stable complete work before being ported to several OS including Linux becomes by virtue of a bridge a derivative work of Linux. It's magical thinking.

Let's say I make a movie M. It's a nice movie, but it doesn't have music. Someone else wrote some music S that is quite lovely. If anybody takes my movie M and mixes in music S, then the new movie is a derivative work of both M and S.