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A middle school science class studying ocean ecosystems must gather material for multimedia projects. The teacher downloads pictures and information on marine life from various commercial and noncommercial sites to store in a folder for students to access. This is fair use.
What is True
The Web may be mined for resources. Download away (of course, don't hack into subscription sites)! But remember: you can't put these projects back up on the Web without permission from the copyright holders.