Oh! :) Sorry, theres no license, you can just download it straight away! :)
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(CC0 license - is way say the work is public domain https://creativecommons.org/about/cclicenses/)
You should add the license into metadata for the asset pack(s):
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art