Hm, https://metacpan.org/source/DAVECROSS/Ogg-Vorbis-Header-0.11/README says:

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. A copy of this license is included with this module (LICENSE.GPL).

A library for editing Ogg Vorbis comments is distributed with this library as unmodified source code (inc/vcedit.h, inc/vcedit.c, inc/i18n.h). This library is Copyright (c) Michael Smith msmith@labyrinth.net.au. It is licensed under the GNU Library General Public License (LGPL). A copy of this license is included with this module (inc/LICENSE.LGPL).

So the module is GPL 2+ and the library included is GPL.