# Third-party notices and research acknowledgments

This file records incorporated third-party code and prior public research that materially informed this
project. It does not license Eushully game assets or code, and no original game files are distributed with
this repository. The repository's MIT license covers authored project work only; material identified below
remains subject to its own terms or is acknowledged as prior research rather than relicensed here.

## Eushully-Decompiler research

Early SYS4 instruction decoding and the initial opcode ABI/catalog were informed by Kelebek's public
[Eushully-Decompiler](https://github.com/Kelebek1/Eushully-Decompiler) project. That work established a
valuable starting point and accelerated this reimplementation. Historical and per-opcode provenance is
preserved in `vm-map/opcodes.toml`.

This repository does not vendor the upstream source files. Its opcode registry combines that foundational
catalog with independent script-corpus analysis, native `AGE.EXE` investigation, runtime probes, and
reimplementation testing. This acknowledgment is not a claim that the project was developed under a formal
clean-room process.

## GARbro AGF decoding algorithm

`engine/Age.Engine/Sys4/AgfDecoder.cs` ports the AGF decoding algorithm from GARbro's
`ArcFormats/Eushully/ImageAGF.cs`, Copyright (c) 2014-2020 morkt, under the MIT License:

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