  Let the DRO (Diffeomorphism, Reparametrization, Observer) algebra DRO(N) be
the extension of $diff(N)\oplus diff(1)$ by its four inequivalent Virasoro-like
cocycles. Here $diff(N)$ is the diffeomorphism algebra in $N$-dimensional
spacetime and $diff(1)$ describes reparametrizations of trajectories in the
space of tensor-valued $p$-jets. DRO(N) has a Fock module for each $p$ and each
representation of $gl(N)$. Analogous representations for gauge algebras
(higher-dimensional Kac-Moody algebras) are also given. The reparametrization
symmetry can be eliminated by a gauge fixing procedure, resulting in previously
discovered modules. In this process, two DRO(N) cocycles transmute into
anisotropic cocycles for $diff(N)$. Thus the Fock modules of toroidal Lie
algebras and their derivation algebras are geometrically explained.
