The assets of NFLib are distributed under CREATIVE COMMONS licence:

https://creativecommons.org/licenses/by/4.0/

Attribution 4.0 International (CC BY 4.0)
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You are free to:
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- Share: copy and redistribute the material in any medium or format.
- Adapt: remix, transform, and build upon the material for any purpose, even
  commercially.

The licensor cannot revoke these freedoms as long as you follow the license
terms.

Under the following terms:
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- Attribution: You must give appropriate credit, provide a link to the license,
  and indicate if changes were made. You may do so in any reasonable manner, but
  not in any way that suggests the licensor endorses you or your use.

No additional restrictions: You may not apply legal terms or technological
measures that legally restrict others from doing anything the license permits.

Notices
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You do not have to comply with the license for elements of the material in the
public domain or where your use is permitted by an applicable exception or
limitation.

No warranties are given. The license may not give you all of the permissions
necessary for your intended use. For example, other rights such as publicity,
privacy, or moral rights may limit how you use the material.
