QuoteEdge of the Frontier is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
and on page 3 it states:
QuoteEdge of the Frontier is based on the popular Star Wars: Edge of the Empire roleplaying game (EotE) by Fantasy Flight
Games. It uses the same game terms and many similar skills and resolution mechanics. In order to play Edge of the
Frontier, you will need to own and be familiar with the EotE game, as this document will make references to it. You
can learn more about that game and purchase it at https://www.fantasyflightgames.com/en/products/star-wars-edge-of-the-empire/
means "needs the original players handbook to play"
and if i saw that correctly, he even uses different names for the talents in the talent trees, to avoid possible copyright issues.