All I know is the feeder mentioned something about legality. It really is a shame but we can't encourage feeders to break laws in their respective countries. I am not familiar with the laws in Spain regarding ATC audio feeds. If it is the same situation as in the U.K., it is likely to be an antiquated law that has no purpose in modern society. If you live in Spain and know the specifics of this law, I would encourage you to contact your politicians and work to have it eliminated or to have this type of activity exempted from the law.
Dave