What is the difference between copyright and copyleft?

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Tags

1. #later
2. #works
3. #stipulation
4. #versions
5. #right
6. #people
7. #distinguished
8. #rights
9. #freely
10. #copyleft
11. #copyright
12. #offering
13. #modified
14. #preserved
15. #derivative
16. #created
17. #copies
18. #distribute
19. #practice