Is downloading PDF books legal?

Related questions

1. Are eBooks legit?
2. Can you tell if a DVD has been ripped?
3. Can downloading a PDF give you a virus?
4. Is it illegal to rip a DVD for personal use?
5. Is it safe to open PDF?
6. Where can I find free eBooks?
7. Can Epubs contain viruses?
8. How much of a textbook can I photocopy?
9. What is PDF bad for?
10. Is Photocopying a textbook illegal?

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