What's the difference between copyright and copyleft?

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Tags

1. #specifically
2. #which
3. #compatible
4. #copyright
5. #requires
6. #allow
7. #license
8. #licenses
9. #invented
10. #legal
11. #describe
12. #their
13. #refers
14. #distributing
15. #anyone
16. #copyleft
17. #redistribution
18. #derived