  This document describes the conceptual design for the Offline Software and
Computing for the Deep Underground Neutrino Experiment (DUNE). The goals of the
experiment include 1) studying neutrino oscillations using a beam of neutrinos
sent from Fermilab in Illinois to the Sanford Underground Research Facility
(SURF) in Lead, South Dakota, 2) studying astrophysical neutrino sources and
rare processes and 3) understanding the physics of neutrino interactions in
matter. We describe the development of the computing infrastructure needed to
achieve the physics goals of the experiment by storing, cataloging,
reconstructing, simulating, and analyzing $\sim$ 30 PB of data/year from DUNE
and its prototypes. Rather than prescribing particular algorithms, our goal is
to provide resources that are flexible and accessible enough to support
creative software solutions and advanced algorithms as HEP computing evolves.
We describe the physics objectives, organization, use cases, and proposed
technical solutions.
