All materials are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License which means that you you are free to share and adapt the materials of the project provided that:

• 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. 
• NonCommercial: you may not use the material for commercial purposes
  
• ShareAlike: if you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original
  

No additional restrictions applies, so you may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

However, the only restriction for the use of the material is that identifiable people, the project or the project members may not appear in a bad light or in a way that they may find offensive, unless they give their consent. You should also make sure the depicted content (people, logos, private property, etc.) is suitable for your application and doesn't infringe any rights.