The use of papers published from April 2016 onwards is licensed under the Creative Commons License - Attribution 4.0 International (CC BY 4.0).
Brief summary of the agreement
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
The use of papers published from 2013 to March 2016 is licensed under the Creative Commons License - Attribution 3.0.
The use of papers published from 2007 to 2012 is licensed under the Creative Commons License - Attribution-NonCommercial 2.0 Germany.