This file does not have any type of protection. You can reuse the scene, the render settings, the lights, the materials, but above all you can learn from the file, moving inside the project, observing how the light was created and handled, how materials are developed, what is the role that every textures play within them, and the values that fill every single option.The scene is optimised to get as much performance and as little memory usage as possible. I would still reccomend a system with at least 8gb RAM and 6gb GPU memory. (al though the rendered eevee viewport uses less than 3gb RAM and GPU memory)
If your GPU doesnt have enough memory, you can always choose to render with cycles on your CPU.
The 3D grass particles are turned off in the viewport for optimisation reasons, but are easy to enable in the outliner.
If you need more performance, you can turn off more layers like the vegetation, interior lights or lowering the shadow resolution.