GPLv3 is quite limiting for a JS library. The source file[1] also has no license in the header, just a copyright.
[1] http://veritetimeline.appspot.com/latest/timeline-min.js
[1] http://veritetimeline.appspot.com/latest/timeline-min.js
Verite Timeline 0.82
Copyright 2011 Verite.co
Designed and built by Zach Wise digitalartwork.net
Date: February 7, 2012
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 3 of the License, or
(at your option) any later version.
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.
http://www.gnu.org/licenses/I've never been able to find a conclusive answer on GPL applied to Javascript