Is selling PDF books illegal?

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Tags

1. #authorized
2. #jurisdiction
3. #authors
4. #giveaway
5. #their
6. #unless
7. #illegal
8. #source
9. #author
10. #publisher
11. #given
12. #being
13. #almost
14. #immoral
15. #probably
16. #every
17. #sales
18. #barring
19. #compensated