The Collaborative International Dictionary of English v.0.48:

game license \game license\ n.
   a license authorizing the bearer to kill a certain type of
   animal during a specified period of time.

   Syn: hunting license, game license.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

game license
    n 1: a license authorizing the bearer to kill a certain type of
         animal during a specified period of time [syn: hunting
         license, hunting licence, hunting permit, game
         license]