Some Legal Analysis of Combining propriety code GPL etc.
As it happens I wrote a section on this topic in a recent paper. Look
in II.B.d (paginated at 24 in the pdf) discussing thecompulsory source
The paper is titled Open Source Software and Implications for
International Copyright and Moral Rights in Software and can be found at
(TOC etc. at http://www.nihonlinks.com/JamesMiller/OpenSourceMoralRights/).
I consider consequnces of copyright in derivative works being held by
the derivative author. The separate copyright makes the contractural
interpretation of the terms of the initial license either as something
that revokes the license or or not, all the more important. I think the
ultimate interpretation will depend on the jurisdiction where an action