  We discuss an inherent Pauli-Villars regularization in Bopp-Podolsky's
generalized electrodynamics. Introducing gauge-fixing terms for Bopp-Podolsky's
generalized electrodynamic action, we realize a unique feature for the
corresponding photon propagator with a built-in Pauli-Villars regularization
independent of the gauge choice made in Maxwell's usual electromagnetism.
According to our realization, the length dimensional parameter $a$ associated
with Bopp-Podolsky's higher order derivatives corresponds to the inverse of the
Pauli-Villars regularization mass scale $\Lambda$, i.e. $a = 1/\Lambda$.
Solving explicitly the classical static Bopp-Podolsky's equations of motion for
a specific charge distribution, we explore the physical meaning of the
parameter $a$ in terms of the size of the charge distribution. As an offspring
of the generalized photon propagator analysis, we also discuss our findings
regarding on the issue of the two-term vs. three-term photon propagator in
light-front dynamics.
