Apache License V 2.0
HornetQ is licensed under the Apache Software License version 2.0 with the exception of a very small number of files that we were unable to relicense which remain licensed under the LGPL.
We aim to provide alternative ASL licensed versions of those files over time.
The ASL 2.0 has fewer restrictions on use than the LGPL, thus providing fewer barriers to adoption.
We want HornetQ to be adopted as widely as possible so that's why we chose it.