For this reason some copyleft licenses are also known as reciprocal licenses, they have also been described as "viral" due to their self-perpetuating terms.
Για αυτό το λόγο οι copyleft άδειες είναι γνωστές και ως αμοιβαίες άδειες, ή ως "viral" καθώς έχουν αυτό-διαιωνιζόμενους όρους.