DROPS is released under the terms of the GNU General Public License (GPL) version 2. See the file COPYING for details. For different licensing schemes please contact drops@os.inf.tu-dresden.de.

Note that some parts of DROPS are derived from other GPL code and hence are copyrighted by other parties. Different licensing of those parts either requires approval of the respective owners or requires to rewrite the code. To find the best solution for you, contact drops@os.inf.tu-dresden.de.