Several licences are used, depending on the project. In brief:
FLUTE/ALC | Two implementations are available, one is commercial, the other one is open-source (GNU/GPL) | see here |
NORM | open-source (GNU/GPL) | see here |
LDPC | open-source (GNU/LGPL for INRIA’s code, and specific for Radford Neals’ code) | see here |
Interested people are invited to see the per-project licence web page, the licence file in the distribution, and/or contact me.