hermes is available under a dual licensing model. One license type is for commercial (english version) use, the other one for private and scientific (english version) use. The appendix describes what libraries and programs are covered by the license. It is bi-lingual (German and English) and is the very same for both licenses.
At the moment the license texts are available in German and English.
The licenses are also available as PDF in our downloads section.
hermes uses the library essentials which is released under a similar license.