So say that I use LeoCAD to export some brick models to Blender. Would it be unethical to modify the models in various ways (tris to quads tool, subsurfacing, textures, rigging, etc.) and then publish them to the internet, assuming that I do not try to profit from them in any way?
Almost certainly no, but with some caveats:
The vast majority (and I would assume the entire subset used by LeoCAD) are covered under the Creative Commons Attribution License 2.0:
You are free:
- to Share — to copy, distribute and transmit the work
- to Remix — to adapt the work
- to make commercial use of the work
Under the following conditions:
- Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the works).
However there are parts in the library that are not covered by the LDraw Contributor Agreement (CA), and these are covered by the more restrictive NonCA agreement. You are expressly forbidden from sharing, or making derivative works of these parts (creating 2d renderings of the elements isn't considered a derivative work, but converting the parts to a different format is).
All part files should have a license comment in their header stating either:
0 !LICENSE Redistributable under CCAL version 2.0 : see CAreadme.txt
0 !LICENCE Not redistributable : see NonCAreadme.txt
You should check those parts you wish to adapt, and proceed accordingly.