Courtesy of @JasiekKuna ?
Regarding to Your answers Polish law regulation are difficult and besides You are right, but not exactly. Now I will explain You why: in general You shouldnt fly above level 150 meters, but isn't forbidden. This regulation is made becouse of colision possiblity with small aircrafts. In case of collision the blame in general is put onto drone operator. That is why You shouldn't fly above 150 meters, if You don't have much experience or above is existing fly traffic.
You can also look further in more reliable sources:
www.pansa.pl
or
