Edit: yeah that is how you avoid copyright infringement https://en.wikipedia.org/wiki/Clean_room_design https://en.wikipedia.org/wiki/Clean_room_design Origina

Edit: yeah that is how you avoid copyright infringement https://en.wikipedia.org/wiki/Clean_room_design https://en.wikipedia.org/wiki/Clean_room_design Original comment: I could swear this was actually the standard practice for writing an implementation of an unknown file format or interface without infringing on copyright. But I don't remember the term for it.