You are not allowed to use images, videos and music from internet in your course. It is a common misconception that copyright law does not apply to the internet. The copyright laws throughout the world clarify that making text, images, software, music or anything else protected by copyright law.
Except the images, videos and music with a special license, the so-called Creative Commons license.
You can find all the information such as:
- how you have to attribute them
- where to find them
about images, videos, drawings and music on the Creative Commons webpage.
Take a look at this flow chart for using images, videos etc.