Creative Commons Attribution 4.0 International Public License

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to be bound by the terms and conditions of this Creative Commons 
Attribution 4.0 International Public License ("Public License"). 
To the extent this Public License may be interpreted as a contract, 
You are granted the Licensed Rights in consideration of Your acceptance 
of these terms and conditions, and the Licensor grants You such rights 
in consideration of benefits the Licensor receives from making 
the Licensed Material available under these terms and conditions.

You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material for any purpose, even commercially.

Under the following terms:
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  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.

Full license text: https://creativecommons.org/licenses/by/4.0/legalcode