NOTICE

rvt-rs — open reader for Autodesk Revit files
Copyright 2026 Griffin Long

Licensed under the Apache License, Version 2.0 (see LICENSE).

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Trademark and attribution notices
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"Autodesk" and "Revit" are registered trademarks of Autodesk, Inc.
This project is not affiliated with, endorsed by, or sponsored by
Autodesk. All references to "Autodesk" and "Revit" in this project's
source, tests, documentation, and output are nominative fair use —
they identify the file format this reader parses, and no more.

This project neither uses nor distributes any Autodesk source code,
object code, proprietary SDK components, or header files. All
file-format observations documented here were obtained by inspecting
the bytes of files written by Autodesk Revit — publicly shipped
sample content — using only public tools (the Microsoft Compound
File Binary Format specification [MS-CFB], RFC 1952 gzip, and
standard Rust crates).

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Interoperability basis
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Reverse engineering for the sole purpose of achieving interoperability
between independently-developed software and the Autodesk Revit file
format is recognised as lawful fair use under:

  * United States — Sega Enterprises v. Accolade, 977 F.2d 1510
    (9th Cir. 1992); Sony Computer Entertainment v. Connectix, 203
    F.3d 596 (9th Cir. 2000).
  * European Union — Article 6 of Directive 2009/24/EC (Software
    Directive).
  * Australia — Copyright Act 1968, Section 47D.

File formats themselves are not copyrightable subject matter (Baker
v. Selden, 101 U.S. 99 (1879); Lotus Development v. Borland, 516
U.S. 233 (1996)). The Microsoft Compound File Binary Format is a
published public specification; the compression (RFC 1951 DEFLATE)
is an Internet standard.

No access-control or rights-management technology has been
circumvented by this project — the underlying Revit files are not
encrypted and carry no technological protection measures.

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Third-party dependencies (runtime)
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  cfb           — MIT OR Apache-2.0
  flate2        — MIT OR Apache-2.0
  encoding_rs   — Apache-2.0 OR MIT
  quick-xml     — MIT
  serde         — MIT OR Apache-2.0
  serde_json    — MIT OR Apache-2.0
  clap          — MIT OR Apache-2.0
  anyhow        — MIT OR Apache-2.0
  thiserror     — MIT OR Apache-2.0

See each dependency's own license for full terms. All runtime
dependencies are permissively licensed and compatible with
Apache-2.0 redistribution.

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Test-corpus attribution
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The integration test suite uses the publicly-available
`rac_basic_sample_family` RFA fixture family distributed by
Autodesk as part of every Revit release, and curated into a
Git-LFS-hosted repository by Andreas Philipp at
https://github.com/phi-ag/rvt under the Unlicense. The sample
family files themselves are Autodesk property; this project
consumes them only for interoperability-verification testing and
does not redistribute them (the phi-ag/rvt test corpus is pulled
via LFS from their repo at `git clone` time; it is not vendored
here).