Quantum gauge symmetry from finite field dependent BRST transformations
  Using the technique of finite field dependent BRST transformations we show that the classical massive Yang-Mills theory and the pure Yang-Mills theory whose gauge symmetry is broken by a gauge fixing term are identical from the view point of quantum gauge symmetry. The explicit infinitesimal transformations which leave the massive Yang-Mills theory BRST invariant are given. 
Rabin Banerjee and Bhabani Prasad Mandal (S. N. Bose National Center   for Basic Sciences)