Quoting Miroslav Suchy (2012-08-16 14:29:02)
The other packages which have LICENSE in various paths are e.g. firefox: /usr/lib64/firefox/LICENSE or libreoffice: /usr/lib64/libreoffice/LICENSE or sos: /usr/share/sos/LICENSE or kde: /usr/share/kde4/apps/LICENSES/GPL_V2
It's quite possible that firefox and/or kde use those files during runtime. So there should be possibility for an automatic exception in those cases. Other than that, I agree: %doc LICENSE is the way to go