License

This webpage and the material that is made available on this webpage is licensed under a Creative Commons license.

• Since 2021, documents stored on DROPS are typically published under a CC BY Creative Commons Attribution 4.0 International license.
• Since 2013, documents stored on DROPS are typically published under a CC BY Creative Commons Attribution 3.0 Unported license.
• Before 2013 also CC BY-NC-ND and CC BY-ND were used.
• The authoritative license is always the one given in the PDF.