https://bugzilla.redhat.com/show_bug.cgi?id=1208835
--- Comment #5 from Parag AN(पराग) panemade@gmail.com --- Many times upstream developers of fonts do not update meta information like version number, License url, Copyright etc. in fonts also not release versioned tarball. So best way to identify that upstream silently changed the font file but not information we should add maximum identification to the packaged font file.
If you still think upstream is right in writing 7.15 then good to clarify with him again but if he says its 7.15 but forgot to update then our package naming is better 7.13-0.2.20150430 that will say that packaged font archive is downloaded on 20150430 date and inside font information say 7.13 as also archive tarball is not versioned and there is no information in other supporting text files in that tarball.