The files attributed to the "Valhalla Project" origin are contributions from the Valhalla Project team itself.  
These assets adhere to the project's default license for custom content:  

CC BY-SA 4.0
https://creativecommons.org/licenses/by-sa/4.0/
https://creativecommons.org/licenses/by-sa/4.0/legalcode

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Keep in mind that individual copyrights and distribution restrictions are applicable to each asset within this repository.  

Regrettably, some assets may lack explicit license files due to the project inheriting content from Cube 2 or Tesseract, or from contributors who omitted license documentation in the distant past and are now, for various reasons, unreachable.
If there are any uncertainties regarding licensing, requests for asset removal or updates to license conditions, please do not hesitate to contact the project staff.