SchoolCAD: third-party components in this folder
================================================

SchoolCAD's exact-geometry engine (true fillets and chamfers, exact curves, STEP export) is
OpenCascade Technology, used through replicad. The files are used unmodified, except for the one
change to replicad_single.js described below.

replicad 1.2.0                     MIT licence            LICENSE-replicad.txt
  https://github.com/sgenoud/replicad   (files: replicad.js, casting-c4FpthHM.js)
  Bundles flatbush (ISC, LICENSE-flatbush.txt) and opentype.js (MIT, LICENSE-opentype.txt).

replicad-opencascadejs 1.1.0       GNU LGPL 2.1           LICENSE-opencascade.txt
  OpenCascade Technology compiled to WebAssembly by the replicad project.
  https://github.com/sgenoud/replicad/tree/main/packages/replicad-opencascadejs
  OpenCascade source: https://github.com/Open-Cascade-SAS/OCCT
  (files: replicad_single.js, replicad_single.wasm)

LGPL notes
- The library is a separate set of files, loaded at run time with a dynamic import. You may replace
  replicad_single.js / replicad_single.wasm with your own build of the same library; SchoolCAD only
  calls it through replicad's public API.
- Change made to replicad_single.js (the Emscripten/Embind JavaScript glue, not the WebAssembly):
  two functions that generate code with `new Function` (the Embind function invoker and the emval
  method caller) are replaced with closures that do the same thing, so the engine runs under
  SchoolCAD's Content-Security-Policy, which does not allow 'unsafe-eval'. This is the code
  Emscripten itself emits when built with DYNAMIC_EXECUTION=0. The change is applied, and checked,
  by tools/vendor-occt.mjs in the SchoolCAD source.