When a creation is in the public domain, that means it is not under copyright and can be used freely. A creation may also be licensed by its creator to be used or adapted by others - for free! You should always check whether a work (image, music, web content, video, etc.) is licensed to be used or licensed to be used and adapted. See the image at the bottom of the page for a quick overview of how this works.
As with any other work, you will need to cite your image's source. This is called an attribution statement. The consist of the file name of the image, the author, and the Creative Commons statement. Ideally, each of these is also hyperlinked. Here is a common example, for the image below:
"File:Foter Creative Commons license diagram.jpg" by foter is licensed under CC BY-SA 3.0
For Video content, this statement would look like this:
Authoring person/agency. (Full date of publication year, month day). Title as it appears. [Video]. YouTube. All rights reserved (or applicable cc statement, if posted. Sharing link.
Here is an example used in the Open RN project:
khanacademymedicine. (2015, July 20). Personality disorders | Behavior | MCAT | Khan Academy. [Video]. YouTube. All rights reserved. https://youtu.be/-Xv593jgyJ4
A thing to note is that if you want to embed a video, the video must be in the public domain (government agency) OR have a CC statement allowing embedding. TED videos cannot be embedded in OER publications without permissions from TED ED. Reach out to Nic Ashman, nashman@cvtc.edu, if you need assistance in this area.
The links below will get you started with finding media that can be used for your media production projects. This is not a comprehensive list.
"File:Foter Creative Commons license diagram.jpg" by foter is licensed under CC BY-SA 3.0