Each type of work can be sole authorship or joint authorship. So it possible to have collective work with joint authorship. But in this case the authorship is associated only with the selection, coordination and arrangement of the constituent works, not with the works themselves, they are separately authored. The same with derivative work. It can be joint authorship, but the authorship is associated only with modifications to the original work, not with the entire derivative work.
Later the author of the article raises the question similar to the question of this topic.
The traditional view is that each person who contributed copyrightable content to the file is the sole copyright owner of their contribution. Now recall the types of second generation works that copyright law recognizes—the revision, the derivative work, and the subset of a compilation, the collective work—and consider how this contribution affects the initial work. The file with the new changes is no longer the initial work because it has been modified. It may be a revision, although that would not create any new copyright. It is not a collective work because because, under our hypothetical that this is a single file, the contributions are not "separate and independent works," they have been blended together and are inseparable from the initial work. The only possibility left is that it is a "derivative work" of the initial work—meaning there are now two works, the initial work and the newer derivative work.
