Hello, you can read the licensing here: https://www.patreon.com/posts/licensing-27430241
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It depends really, if it's for personal use you have nothing to worry about. If you are gonna mass print the fox sprites as stickers and sell them, that's not good :) You can contact me from the e-mail address provided on the license page if you'd like to share the details and have further questions.