вот и прочитал бы эту лицензию
Royalty Free License
Royalty Free License allows you to use the product without the need to pay royalties or other license fees for multiple uses, per volume sold, or some time period of use or sales. Products published with this license may not be sold, given, or assigned to another person or entity in the form it is downloaded from the site, but can be used in your commercial projects multiple times after paying for it just once.
This is, however, a non-exclusive license and the product remains the property of a seller for further distribution. Please, refer to legally binding General Terms and Conditions to learn more about Royalty Free License, other types of licenses and general rules applicable to all products.
можешь использовать в своих продуктах любое количество раз,
любое использование кроме продажи или передачи другому (т.е. производные, например игра, можно а саму модель в готовом к использованию в редакторе передавать нельзя)
Простой
