  We consider the enhancement of SL(2,R) to Virasoro algebra in a system of N
particles on AdS2. We restrict our discussion to the case of non-interacting
particles, and argue that they must be treated as fermions. We find operators
L_n whose commutators on the ground state, |vac>, satisfy relations that are
reminisent of c=1 Virasoro algebra, provided N \geq n \geq -N. Same relations
hold also on the states L_{-k}|vac>, if (N-k) \geq n \geq -(N-k). The
conditions L_n^\dag = L_{-n}, and L_k|vac> = 0 for k \geq 1 are also satisfied.
