The model and the meshes in meshes/ are converted from

    https://github.com/neobotix/rox
    commit c865076d5412aca9c861e3b3326fb6a30cb393b1
    files  rox_description/urdf/**, rox_description/meshes/{short_frame,diff_wheel,diff_caster}.dae

Copyright (c) Neobotix GmbH
Licence: BSD, as declared in the package manifest (no licence text ships upstream).
Converted to OBJ in metres and assembled into MJCF by external/convert/build_rox_diff_mjcf.py; every
mass, inertia, joint origin and collision primitive is read from the same repository.

--------------------------------------------------------------------------------

The repository ships no LICENSE file, and the meshes carry no per-file copyright header. The only
licence statement the upstream makes is the one in the package manifest that ships the description:

    rox_description/package.xml, at the commit above

      <maintainer email="ros@neobotix.de">Neobotix</maintainer>
      <license>BSD</license>
      <author email="padmanabhan@neobotix.de">Pradheep Padmanabhan</author>

"BSD" names a family, not a document: the 2-clause, 3-clause and original 4-clause texts differ in
what they require. No variant's text is reproduced here, because choosing one would put terms in the
licensor's mouth that the licensor did not write. What every variant does require -- that the
copyright notice and the licence statement travel with the copy -- is what this file is: it names the
copyright holder, the author, the exact upstream revision, and the exact files the model derives
from.

If a downstream use needs the variant pinned (an SPDX-clean SBOM, say), ask Neobotix GmbH to state
it, and replace this paragraph with their answer.