I just noticed that the juce_core license is showing up as GPL/Commercial in the Projucer and module header. I guess this is a copy/paste error?
ID: juce_core
vendor: juce
version: 4.2.4
name: JUCE core classes
description: The essential set of basic JUCE classes, as required by all the other JUCE modules. Includes text, container, memory, threading and i/o functionality.
website: http://www.juce.com/juce
license: GPL/Commercial
...