Compilation copyright is a somewhat ridiculous concept that has gained popularity recently. It's akin to saying that you own the copyright to the particular selection of packages and programs on a particular Linux distro or install CD, for instance.
Its valid copyright law.
So if you have have a collective (or compilation if you want to call it that) copyright on a selection of separately licensed copyrighted works, someone can take your collection and add, remove, or modify something (say, add there logo) and it becomes a seperate collection not covered by the original collective copyright.
Derivative works doent effect collective copyright, its a different type of copyright to copyrighted "works".