Always check an image's license before copying, modifying or distributing photos. Some websites use Creative Commons licenses, while others have created their own open licenses.
Below is a condensed list of open multimedia platforms. For a full list, visit BCcampus Multimedia and Tool Collections.
You can use Google to find openly licenses content by selecting 'Settings' and 'Advanced Search'. From there you can change the 'Usage Rights' to filter by license.
Then narrow your results by usage rights. 
Unless otherwise noted, this guide is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0).