License
openie-cad is free to use — both via the hosted MCP at
https://cad.openie.dev/mcp and locally as a binary. The source
code is not yet open; it lives in a private repository while the
substrate is still iterating fast.
Hosted use (cad.openie.dev)
Free for any use, with no signup. Rate limits and per-session
"joules" accounting apply (see /api/joules for visibility). No
warranty.
Self-hosted binaries
The binary distribution is on the roadmap. License terms for the binary will be published with the first release. Until then, contact the openie-dev team if you have a self-hosted requirement.
Documentation
This repository (openIE-dev/cad) — the documentation site, the
example projects, and the recipe markdown — is MIT licensed.
Contributions are welcome via pull request; see
https://github.com/openIE-dev/cad.
Third-party algorithms
The substrate implements published algorithms from the academic literature; each one is cited on its algorithm theory page:
| Algorithm | Paper | License posture |
|---|---|---|
| LCIS BGA escape | Kong/Yan/Ozdal ICCAD 2007 | Algorithm is public-domain prior art; openie-cad's clean-room implementation has no encumbrance. |
| SALT shallow-light Steiner | Chen et al. ICCAD 2017 | Same. |
| PathFinder negotiation | McMurchie-Ebeling FPGA 1995 | Same; public-domain since 1995. |
| IQN-ILS coupling | Degroote 2009 / Chourdakis 2021 | preCICE itself is LGPLv3; openie-cad's MIT-clean re-derivation does not link or wrap preCICE. |
| Djordjevic-Sarkar dielectric | Svensson-Djordjevic 2001 | Published formula. |
| Cannonball-Huray roughness | Simonovich 2015/2019 (simplified from Huray 2010) | Published formula. |
| FDTD NTFF | Balanis textbook §6.7 | Published formula. |
| Aitken's Δ² | Aitken 1926 | Classical. |