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Legal stuff

elastix is copyrighted by "University Medical Center Utrecht and contributors".

The software is distributed as open source under an OSI-approved license. Starting with elastix 4.8, the Apache 2.0 license is used. For versions prior and including 4.7, the new and simplified BSD license is used. You can find details on the copyright and license for specific versions of elastix below:

Copyright Notice

Copyright 2014 University Medical Center Utrecht and contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

Historical note

elastix was initially developed under contract of the University Medical Center Utrecht, The Netherlands, by Stefan Klein and Marius Staring under supervision of Josien P.W. Pluim. It is currently maintained at the Leiden University Medical Center, The Netherlands, and at Erasmus Medical Center, Rotterdam, The Netherlands.

Third parties

  • Insight Toolkit. Copyright by the Insight Software Consortium, and distributed under the Apache 2.0 license. Several files throughout elastix are derived from the Insight Toolkit (ITK). In addition, the ITK is required by elastix for compilation of the source code.
  • Approximate Nearest Neighbor library. Copyright by the University of Maryland, and distributed under the GNU Lesser Public Licence. The files can be found in the subdirectory src/Common/KNN/ann_1.1. Please read the content of the subdirectory for details.

Contributor License Agreement

We welcome contributions to elastix! Similar to the ITK and to the Apache project, and to avoid any confusion on copyright, licensing, etc we ask all contributors to sign a Contributor License Agreement (CLA). This means that you allow your contributions to be distributed under the Apache 2.0 license via elastix; it does not change your rights to use your own contributions for any other purpose.

Please fill in one of the following and return it by email to :
  • Individual CLA: click here. For individuals contributing to elastix.
  • Corporate CLA: click here. For corporations contributing to elastix.
last modified: 28-04-2015 | Copyright 2004 - 2015 © by Stefan Klein & Marius Staring | elastix logo