WordPress doesn't get to unilaterally decide what is derivative. Project owners do not get to decide that. They do get to decide what license to use, and what t

WordPress doesn't get to unilaterally decide what is derivative. Project owners do not get to decide that. They do get to decide what license to use, and what the terms of the license are. A court will decide whether themes are derivative. If themes are derivative works that the copyright owner can control, then the same expansive reasoning would mean that movie studios can decide whether you can make copies of that BR movie you just bought, game companies could bar you from trading saves, and publishers/authors could bar you from talking about that novel you just read. Copyright law doesn't change just because open source gets involved, and we shouldn't change copyright law just b/c an open source project is on a power trip.