How do you know if images are copyrighted?

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Tags

1. #image
2. #camera
3. #saved
4. #google
5. #click
6. #choose
7. #picture
8. #upload
9. #images
10. #search
11. #button
12. #visit
13. #select
14. #enter
15. #determine
16. #computer
17. #research
18. #copyrighted