Is downloading YouTube Video legal?

Tags

1. #attempted
2. #several
3. #service
4. #illegal
5. #google
6. #terms
7. #offer
8. #music
9. #websites
10. #stream
11. #copyrighted
12. #download
13. #violation
14. #video
15. #convert
16. #youtube
17. #their
18. #services
19. #converter
20. #technically
21. #ripping