OpenAirInterface is under GNU GPLv3 license. The full GNU General Public License is included in this distribution in the file called "COPYING".

The OpenAirInterface (OAI) software is composed of six different parts: 

openair1: 3GPP LTE Rel-8 PHY layer + PHY RF simulation

openair2: 3GPP LTE Rel-9 RLC/MAC/PDCP/RRC implementations, eNB application, X2AP

openair3: additional networking protocols (PMIP, MIH, Multicasting) and scripts 

openair-cn: 3GPP LTE Rel9 and 10 MME/NAS, S+P-GW, HSS, S1AP (ENB and MME).

openairITS: IEEE 802.11p software modem (all layers)

common: some common OAI utilities, other tools can be found at openair2/UTILS


targets: scripts to compile and lauch different system targets (simulation, emulation and real-time platforms, user-space tools for these platforms (tbd)) 

see README files in these subdirectories for more information

see also https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/WebHome