Licenses for OpenAD components

A main goal of OpenAD is to be open source. Because we use external components the individual licenses of each component can be found at the following links (refering either to the component website or the copyright files as provided in the source code repository of the respective component).
Some ancillary tools (autoconf, latex indexing, graphviz, doxygen, xmlformat, gnuplot) are used for build preparation, documentation, visualization and debugging but are not part of the OpenAD core and therefore not listed here.