Hi! The pack is not under any particular license cause I've never been able to ifugre them D: But you have a small txt file (License.txt) inside the pack folder where you can see what it's allowed and not allowed to do with the assets.
If you want to credit me (thanks btw <3) you can place a "Vryell" where you prefer (assets by, special thanks, etc).
Y saludos desde las Islas Canarias jajaja!