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Browse Over 500 million images, available for resuse. The image results have creative commons licenses or are in the public domain. You will still have to give proper attribution if you use an image in your online course.
Learn about the 6 different Creative Commons license types and how you can use the work based on the license type.
How to apply a CC license or CC0 to your work
CC-licensing your work is simple. All you have to do is choose the CC license that suits your needs and then communicate this choice in a way that will be clear to people who come across your work. As part of this communication, you should include a link to the license you’ve chosen.
This can be as simple as a bit of text stating and linking to the license in a copyright notice, like this: