It seems to be a problem common to the plugins subtree. See e.g. plugins/systray/systray-manager.c: /* * Copyright (c) 2002 Anders Carlsson <andersca@gnu.org> * Copyright (c) 2003-2004 Benedikt Meurer <benny@xfce.org> * Copyright (c) 2003-2004 Olivier Fourdan <fourdan@xfce.org> * Copyright (c) 2003-2006 Vincent Untz * Copyright (c) 2007-2010 Nick Schermer <nick@xfce.org> * * This library 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. * * This library is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU **Lesser** General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ (**highlight** mine) Note that the firt two clauses refer to GPL. However, the last clause refers to LGPL instead. While that isn't technically a legal problem, it is confusing.
Seems to be related to https://git.xfce.org/xfce/xfce4-panel/commit/?id=3097df262 which introduce the mixup between GPL and "Library GPL" , later updated in https://git.xfce.org/xfce/xfce4-panel/commit/?id=24bb3344e to use the term "Lesser GPL". In this case I don't know which license apply and if we can change it.
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