Copyright Quiz

I took the quiz and I thought it was a little tough. I received a 57% at the end. I also am wondering about the National Anthem question. I thought that after so many years things lose their copyright...plus it's our National Anthem.
Copyright Quiz Answers
1. False
2. True
3. True
4. True
5. True
6. True
7. False
8. False
9. False
10. True
11. False
12. True
13. False
14. True
15. True
16. True
17. False
18. True
19. True
20. True