The overall LimeSurvey software package is Copyright © 2003 by Carsten Schmitz with portions contributed/copyrighted by many others (see COPYRIGHT.PHP in the downloaded package and the source code itself) and all of it is provided under the terms of GPL.
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) any later version.
The LimeSurvey documentation is Copyright © 2005 onwards by the individual authors of each page (see History link on each page) and is provided to all under the Creative Commons Share-Alike license.
LimeSurvey is distributed in the hope that it will be usefull, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License v2 for all details.
The name LimeSurvey and the logo is a registered trademark of LimeSurvey GmbH / Germany.
If you are intending to use the name and/or logo to advertise generic LimeSurvey services (e.g. LimeSurvey Hosting, LimeSurvey Support, LimeSurvey Certification, LimeSurvey Training, LimeSurvey Consulting, LimeSurvey Customisation, LimeSurvey Theme design, LimeSurvey Integrations, LimeSurvey Installations, etc) or as the name of a software package, then you must seek and receive direct permission in writing from LimeSurvey GmbH, in accordance with normal trademark restrictions.
There are no restrictions on how you use the name in other contexts (for example, if you use LimeSurvey to run your surveys then you can use the name freely to refer to it). If you aren't sure of a particular case, please ask LimeSurvey Support . We are happy to either provide you with official permission in writing or help you fix your wording.
For scientific papers please cite us like this:
Limesurvey GmbH. / LimeSurvey: An Open Source survey tool /LimeSurvey GmbH, Hamburg, Germany. URL http://www.limesurvey.org
Download the LimeSurvey brand collection (Logo & Fonts)