The essays and academic resources on this section have a Attribution-NoDerivatives 4.0 International licence (CC BY-ND 4.0). What does it mean?

• You are free to share, copy and redistribute the material in any medium or format for any purpose, even commercially.
• 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.
• If you remix, transform, or build upon the material, you may not distribute the modified material.

Have a look on the full license to have a complete information.