Thanks for the info, in all honestly 4.0 isn't really what I want. I'll take a look at their site and FAQ in a bit and make a decision, there's a small update coming to this pack I've been working on recently (shhhh don't tell anyone ;) ) but, I'll likely update this and my other one at that time.
But like I said prior, if you're worried right now of it's Copyright Status, just right now don't claim you made it basically. If I go with a Creative Commons, and the closest to what I want is CC0, it'll be that. I absolutely do not want people to have to worry about crediting me if they're working on a project, especially that sometimes people could just forget.
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You can leave a comment here to support my proposal about making metadata visible for those who are interested in it https://itch.io/t/2919128/metadata-encouragement#post-7952450