Last updated: May 1, 2019
All textures on cgbookcase.com are licensed as CC0. Learn more about the CC0 License
In short, this means you can use the textures for anything, even without giving credit.
If you created something using the textures on cgbookcase.com, feel free to use the hashtag #cgbtextures when posting it to Instagram, Twitter, Artstation or so, so I can see it. :)
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The tutorials are not licensed as CC0.