PSn00bSDK maintainer here. Unfortunately the project cannot really be considered clean room; the original versions of most libraries contained code that was either lifted straight from Psy-Q disassemblies or heavily inspired by them. I have since rewritten pretty much all of it (with the exception of the GTE library which still has some Sony code) using only Psy-Q API documentation as a reference, but the "ship of Theseus" nature of the rewrite makes it hard to argue that it is a clean and legally safe project.
On the flip side, there are plenty of other open source PS1 SDK options that have been written from scratch, do not reimplement the same API as Psy-Q and can thus be considered clean for the most part. Here's a few of them:
> using only Psy-Q API documentation as a reference
Doesn't that mean it's not clean room? Since even having those docs in the first place would not be legal?
I've seen others claim that clean room can only be an option if development was done without any input from anyone who has even read their docs, not just whether you have yourself or not.
For example in the N64 world some might say development is forever tainted because it's almost impossible to get information that wasn't sourced somehow ultimately from the oman dump.
