Suppose you are looking for an image online to use in your physics lab write-up. You have found several possible options, but only one option will allow you to use it right away without getting clearance from the author or having to pay a fee. Which one do you choose?

A PD (public domain) image can generally be used without asking the author for permission or paying a fee. The © symbol indicates copyright, while TM and ® identify trademarks; none of those labels means the image is free to use. Choose the image with a PD license.

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