CAD QuickLook — Open Source & Licensing

Components

CAD QuickLook makes use of, and is based in part on, facilities provided by the following open-source libraries. Full license texts are included with the app (see its Help → Open Source & Licensing, and the bundled NOTICES.txt).

Open CASCADE Technology (OCCT) 7.9.3 — STEP / IGES parsing and tessellation. © Open CASCADE S.A.S. GNU LGPL v2.1, with the Open CASCADE exception (see below).
openNURBS — Rhino 3DM reading. © Robert McNeel & Associates. Permissive license — provided "as is," with the copyright notice retained.
ufbx — FBX reading. © Samuli Raivio. Dual-licensed: MIT or public domain.
cgltf — glTF / GLB reading. © Johannes Kuhlmann. MIT license.
zlib — compression, bundled within openNURBS. © Jean-loup Gailly and Mark Adler. zlib license.

The complete, verbatim license text for each component is included with the application (Help → Open Source & Licensing, and the bundled NOTICES.txt).

Your right to modify OpenCASCADE (LGPL)

OCCT is licensed under the GNU Lesser General Public License, version 2.1. CAD QuickLook dynamically links OCCT — the libraries are separate .dylib files inside the app bundle. In keeping with the LGPL, you are free to modify OCCT and run a copy of CAD QuickLook built against your own version.

The full text of the GNU LGPL v2.1 is included with the app and available here: LICENSE-LGPL-2.1.txt.
The exact OCCT version used is 7.9.3, built unmodified from the public source tag V7_9_3.
The exact build configuration (the complete corresponding build recipe) is this script: cadquicklook-build-occt.sh — it pins the OCCT version and its SHA-256.

Rebuilding and replacing the libraries

On macOS you can run your own modified copy of the app. Because CAD QuickLook links OCCT dynamically, replacing the libraries is a matter of swapping files and re-signing your copy.

Build OCCT. Run cadquicklook-build-occt.sh (requires cmake and the Xcode command-line tools). It downloads the checksum-verified OCCT V7_9_3 source and produces arm64 libTK*.7.9.dylib files. To run a modified OCCT, edit the OCCT source (from the tag above) before building.
Copy the app so the original stays intact:
cp -R "/Applications/CAD QuickLook.app" ~/Desktop/CADQuickLook-modified.app
Replace the libraries in the copy, keeping the same file names:
cp Vendor/OCCT/lib/libTK*.7.9.dylib ~/Desktop/CADQuickLook-modified.app/Contents/Frameworks/
Re-sign the copy (an ad-hoc signature is enough to run it yourself):
codesign --force --deep --sign - ~/Desktop/CADQuickLook-modified.app
Run it: open ~/Desktop/CADQuickLook-modified.app — first launch may need right-click → Open.

openNURBS (for 3DM) can be replaced the same way using the corresponding build script bundled with the app's source distribution. ufbx and cgltf are MIT-licensed single-file libraries compiled into the extensions.

License & terms

This application's end-user license terms are available here: End User License Agreement →. Nothing in those terms restricts any right granted to you under the LGPL.

Contact

Questions about licensing or corresponding source? Email support@bit0100bitsoftware.com.