@mitu
Thanks a lot for the great advice! This can be closed now.

@rsn8887 https://github.com/taalas/RetroPie-Artwork

Taalas and I worked on those, we had originally discussed including them on retroarch docs but retroarch was (is?) Still tweaking their input configs and you can have multiple retropad configs for the same console if you're using two diff emulators. It was hard to keep up/stay consistent with development as it seemed to change quite frequently.

The licences are gpl so there isn't any reason they couldn't be used on their docs as well but may be worth reaching out to whoever maintains their docs to make sure it fits their style guide/standards. I'm afraid I have other priorities as of recent and can't carry it on so happy for others to do so

@BobHarris Some PCBs could support multiple romsets, and let's not forget NeoGeo. Like I mentioned before, the cabinet (besides the copyrighted artwork) was not a consideration at all for legality, only the PCB/ROMs. They are most likely MAME based hacks, but it IS possible.

@mattrixk Yep, I totally understand WHY you want to protect your work- and your should, and you have every right to. Just saying that I've seen very expensive (and not necessarily successful) corporate legal battles over stuff like this.

As for which license to use, I don't know enough about the various licenses out there right now to make an educated suggestion for you. Perhaps @herb_fargus or @BuZz might have some suggestions.

@retropi19 claims to ship from Russia - I wouldn't hold my breath on anything being done
uk sellers can be reported to Trading Standards and will be shut down
I've been tempted to report others directly to Nintendo or Sony's legal teams