What is the difference between gplv2 and gplv3?

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1. #people
2. #difference
3. #necessary
4. #explicit
5. #gplv3
6. #copyrights
7. #gplv2
8. #license
9. #patents
10. #extent
11. #which
12. #under
13. #contains
14. #program
15. #licensed
16. #patent
17. #between
18. #according