  It is known that the presence of antisymmetric background field $B_{\mu\nu}$
leads to noncommutativity of Dp-brane manifold. Addition of the linear dilaton
field in the form $\Phi(x)=\Phi_0+a_\mu x^\mu$, causes the appearance of the
commutative Dp-brane coordinate $x=a_\mu x^\mu$. In the present article we show
that for some particular choices of the background fields, $a^2\equiv
G^{\mu\nu}a_\mu a_\nu=0$ and $\tilde a^2\equiv [ (G-4BG^{-1}B)^{-1}\
]^{\mu\nu}a_\mu a_\nu=0$, the local gauge symmetries appear in the theory. They
turn some Neuman boundary conditions into the Dirichlet ones, and consequently
decrease the number of the Dp-brane dimensions.
