you please try to enquire from RTI or come to hyderabad ill personally let you meet with th officials of various depts of ministry of defense as u said DRDO even with the manager and ill clarify that DRDO is a GOVT which manufactures defense products and its not a body which validates or does registration or issues any sort of lisence.

and NREE is no where working with ministry of defense its basically a defence company and it is no where involve in any projects or any business in INdia as of now i am ready to prove in physical and documental that too in live