
My products include some digitally enhanced public domain art within sets (as well as new art). These are all public domain or CC0 in the UK and in the artist’s country and for the country of the photo of the art if relevant. . I expect to mainly sell to English speaking countries like US and UK and all the art complies with copyright laws for these countries. I’m in Scotland.
But some countries have stricter laws or don’t agree to the shorter term rule where the artist’s country law trumps other laws, see table I put together which indicates which countries I want to exclude

I don’t expect I’ll sell to countries like Mexico but Mexico’s laws would restrict what I want to sell. Can you see a way around this? Can I put a note at the end of the listing description saying that this isn’t a suitable product due to legal restrictions to buy if you’re in Mexico… list of countries? Or would that not have any legal weight and draw attention to the problem? I’m intending to also add a note at the end about the digital file set being intended for personal use or as a physical gift for friends and family, but due to varying copyright terms it isn’t appropriate to sell on or forward the files as a set. So I could add something else about which countries it’s not an intended product for?
Have Etsy sellers ever lost cases where the artist died more than 75 years ago and it is public domain in the artist’s country and the seller’s country? My assumption is the only people who could sue you would be the Museum/photographer or the artist’s estate? If it’s public domain in those places then do you need to worry about the country you’re selling to? Or in other words, what could be an objection from Mexico about them being allowed to buy my art sets?
What are your thoughts and do you have any evidence for them?