a4ESSOR S.A.S. (Alliance for ESSOR) is a joint venture organized and existing under the laws of France, set up by six EU leading companies: Bittium Wireless Ltd, Indra, Leonardo S.p.a., Radmor S.A., Rohde & Schwarz GmbH & Co. KG and Thales Communications & Security S.A.S) in order to manage projects under the ESSOR (European Secure SOftware defined Radio) Program and to promote the ESSOR products in the SDR community. The aim of the ESSOR program is to develop pan-European Software Defined Radio (SDR) technology in order to improve the ability of Armed Forces to cooperate in coalition operations. The program was initiated in 2009 under the umbrella of the European Defence Agency (EDA) and it is currently sponsored by the governments of Finland, France, Germany, Italy, Poland, and Spain. a4ESSOR S.A.S. has produced and validated the European SDR Architecture and the European High Data Rate (HDR) waveform which have been ported and qualified on several European platforms. The interoperability benefits of the waveform are regularly demonstrated through network tests involving different national platforms.