FlWriter was originally developed by Jean-Marc Lienher.  Development stopped in 2003. I found the code in the internet and ported it to FLTK 1.3.0 and the DOS operating system in 2012.
 
The changes I made fall under same licence as the orginal code except that these changes are my copyright and not that of O'ksi'D. The licence text for the  orginal code is reproduced below.
The utility unrtf is linked with FlWriter now. This utility is GPL software. If this represents an issue the FlWriter code contains two #if statements to optionally call unrtf as a separate utility.
 
Georg Potthast
 
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Copyright (c) 2000-2002 O'ksi'D
 
All rights reserved.
 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
Author : Jean-Marc Lienher ( http://oksid.ch )