re-licensing example code to GPL

**HeyYO** · 29th October 2016, 08:06

I want to include some code from qwt example source code into my GPLv3 licensed open source application. Specifically these files from the "realtime" example:

scrollbar.cpp
scrollbar.h
scrollzoomer.cpp
scrollzoomer.h

These files do not have license headers. I assume they are under the Qwt license as other source files. I was wondering if I can re-license them to GPL to keep licensing clear in my application. I'm thinking about adding this header to the files:

Qt Code:

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/*
  Copyright Â© 2014 Uwe Rathmann
 
  Note: This file is re-licensed from Qwt License to GPL. You can get the
  original file from Qwt project (http://qwt.sourceforge.net/)
 
  This file is part of serialplot.
 
  serialplot 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 3 of the License, or
  (at your option) any later version.
 
  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
  Copyright Â© 2014 Uwe Rathmann

  Note: This file is re-licensed from Qwt License to GPL. You can get the
  original file from Qwt project (http://qwt.sourceforge.net/)

  This file is part of serialplot.

  serialplot 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 3 of the License, or
  (at your option) any later version.

  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
*/

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Would that be okay?