How long until a movie becomes public domain?

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Tags

1. #protection
2. #after
3. #extended
4. #films
5. #movie
6. #before
7. #public
8. #released
9. #american
10. #domain
11. #years
12. #failure
13. #reason
14. #renew
15. #currently
16. #prepared
17. #congress
18. #copyright