I've always felt like #copyleft was authoritarian in that it took away "freedoms", but really it only prevents the "freedom" to use intellectual property to commit violence against:
0. Those who run the program as they wish, for any purpose.
1. Those who study how the program works, and change it so it does their computing as they wish.
2. Those who redistribute copies so they can help their neighbor.
3. Those who distribute copies of your modified versions to others.