[Fedora-legal-list] NTP GPL

Hello I'm packaging libimagequant (https://github.com/ImageOptim/libimagequant), and licensecheck reports some files as NTP GPL (v3 or later) The package COPYRIGHT file inclues the GPL3 license as well as: libimagequant is derived from code by Jef Poskanzer and Greg Roelofs licensed under pngquant's original license (at the end of this file), and contains extensive changes and additions by Kornel Lesiński licensed under GPL v3. [... GPL3 license text ...] © 1989, 1991 by Jef Poskanzer. © 1997, 2000, 2002 by Greg Roelofs. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty. This last snippet is detected as NTP by licensecheck. I don't see NTP mentioned in the software license list on the fedora wiki. What license should I use in the package spec? Thanks Sandro