  The quantization of the second-class constraint systems is discussed within
the projection operator method(POM) of constraint systems. Through the nonlocal
representation of the constraint hyper-operators, new star-products are
defined. Then, the projected operator-algebra of the quantized constraint
systems is constructed with these star-products, and it is shown that the
commutators and symmetrized products among the projected operators contain the
quantum corrections due to the noncommutativity among operators.
