License header of some KDE applications

[Julian Aloofi]

Hello,
in some KDE applications (for example yakuake) there is a quite uncommon GPL 
header in the source files, which reads like this:

  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) version 3 or any later version
  accepted by the membership of KDE e.V. (or its successor appro-
  ved by the membership of KDE e.V.), which shall act as a proxy
  defined in Section 14 of version 3 of the license.

  This program 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 General Public License
  along with this program. If not, see http://www.gnu.org/licenses/.


In the review for knights ( https://bugzilla.redhat.com/show_bug.cgi?id=674180 
) the question how to handle this came up. What would be the appropriate 
License tag in the spec file?
Would be nice if legal could shed some light on this :)

Regards,
Julian