Question about the Art works on openclipart.org

Hi I have questions about http://openclipart.org/
1)Are all the artwork (Images/Pictures) on openclipart.org Free to use and Can I publich for the games?

2)If all the arts/Images are free to use, when I publish for my game, should I inform openclipart.org or do I need to get permission from openclipart.org ?

3)Is there other free Arts/image site?

Thank you in advance.

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According to their website, all of the images are in the public domain, so you should be okay.
I always tell my students to cite their sources. It is the responsible thing to do, but I’m not a lawyer, so this advice is only as valuable as what you paid for it.

A couple of great sites that my students use for art include:
http://www.reinerstilesets.de/
http://www.cgtextures.com/
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