Depends on the licensing really, just because it's open source doesn't mean much. The code on the site doesn't mention anything apart from it's copyright "START GROUP"
A little before the Tremor codec was released for free, me and a few others on here managed to get a free license given to the empeg team for use with the empeg car. It wasn't really viable however as it still required a lot of legal work to get the contracts and licensing details sorted out. It was the release of the Tremor code under it's current license that really made it possible to be used.