Ok. It looks like there shouldn't be any problem, since the SDK's code is licensed in ASLv2, and the source code is available in a git repository [1].
I know it isn't transcendental at all (or maybe yes) to the fedora community (to developers and "common" users); but it is a little bit annoying to download the installer from qt-project, when there's a version in fedora's repos; but without all the complete packages. So I have to choose between "versions" of the _exactly_ same thing: the tested version in fedora ready to "yum-install" (dnf, or whatever), or the untested "official" version, just to be available to use all the feature of the framework.