How to clean-room reimplement with an LLM: feed it the PSD format spec, not Photoshop
jtregunna · x · 2026-10-08
jtregunna described his LLM-based clean-room reimplementation workflow: never tell the model "Photoshop does this, do it like them" — instead hand it the PSD file format spec PDF, have it read and report back, then implement using your own stack. The public spec, not the competitor's product, is the only information source.
This thread starter kicked off a debate on LLM-assisted reimplementations and copyright risk, with kristoph noting a single person running both sides still can't constitute a true clean room.
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