Are images from content library" Creative Common"? Thank you!

Hello!

I am using Articulate Rise to redesign courses for a company. I found images from content library of Rise and would like to use them, but I want to make sure if they are "Creative Common" or not. Sometimes images are FREE, but it doesn't mean that they are creative common...

Also, anyone could recommend some websites of creative common images? I only know nounproject.com and pixabay.com 

Thank you so much!

Carol

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